Companhia Siderúrgica Nacional (SID) 20-F/A 5 Apr 19 2018 FY Annual report (foreign) (amended) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2018shares
Document And Entity Information
Entity Registrant Name	NATIONAL STEEL CO
Entity Central Index Key	0001049659
Document Type	20-F
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity a Well-known Seasoned Issuer	Yes
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	1,387,524,047
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2018

Consolidated Balance Sheet

Consolidated Balance Sheet - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	R$ 2248004	R$ 3411572
Financial Investments measured at amortized cost	895,713	735,712
Trade receivables	2,078,182	2,197,078
Inventories	5,039,560	4,464,419
Other current assets	1,753,024	1,072,715
Total current assets	12,014,483	11,881,496
NON-CURRENT ASSETS
Deferred income taxes	89,394	63,119
Other non-current assets	4,285,223	2,528,475
Financial Investments measured at amortized cost	7,772	0
Total	4,382,389	2,591,594
Investments in associates and joint controlled entities	5,630,613	5,499,995
Property, plant and equipment	18,046,864	17,964,839
Intangible assets	7,253,175	7,272,046
Total non-current assets	35,313,041	33,328,474
TOTAL ASSETS	47,327,524	45,209,970
CURRENT LIABILITIES
Payroll and related taxes	248,185	252,418
Trade payables	3,473,822	2,505,695
Taxes payable	251,746	264,097
Borrowings and financing	5,653,439	6,526,902
Other payables	1,704,857	1,014,980
Provisions for tax, social security, labor and civil risks	106,503	105,958
Total current liabilities	11,438,552	10,670,050
NON-CURRENT LIABILITIES
Borrowings and financing	23,173,635	22,983,942
Other payables	227,328	129,323
Deferred income taxes	601,731	1,173,559
Provisions for tax, social security, labor and civil risks	685,953	719,133
Pension and healthcare plan	905,119	908,721
Provision for environmental liabilities and decommissioning of assets	281,766	337,013
Total non-current liabilities	25,875,532	26,251,691
Shareholders' Equity
Issued capital	4,540,000	4,540,000
Capital reserves	32,720	30
Legal reserves	189,122	0
Earnings reserves	2,933,969	238,976
Treasury Shares	(58,264)	(238,976)
Accumulated Profit / (Loss)	0	(1,291,689)
Other comprehensive income	1,065,188	3,779,032
Total equity attributable to owners of the Company	8,702,735	7,027,373
Non-controlling interests	1,310,705	1,260,856
Total equity	10,013,440	8,288,229
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	R$ 47327524	R$ 45209970

Consolidated Statements of Inco

Consolidated Statements of Income - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit or loss [abstract]
Revenues from sale of goods and rendering of services	R$ 22968885	R$ 18524601	R$ 17148949
Cost of sales and services	(16,105,657)	(13,596,141)	(12,640,042)
Gross profit	6,863,228	4,928,460	4,508,907
Operating expenses/income	83,332	(1,944,495)	(2,563,431)
Selling expenses	(2,263,688)	(1,815,107)	(1,696,896)
General and administrative expenses	(494,023)	(415,841)	(518,232)
Other operating income	4,036,043	824,286	663,509
Other operating expenses	(1,330,706)	(646,944)	(1,076,730)
Equity in results of affiliated companies	135,706	109,111	64,918
Profit before financial income (expenses) and taxes	6,946,560	2,983,965	1,945,476
Financial income	1,310,514	295,074	643,590
Financial expenses	(2,806,157)	(2,758,701)	(3,166,017)
Profit (loss) before taxes	5,450,917	520,338	(576,951)
Income tax and social contribution	(250,334)	(409,109)	(266,546)
Profit (Loss) from continued operations	5,200,583	111,229	(843,497)
Profit (Loss) from discontinued operations	0	0	(9,561)
Profit (loss) for the year	5,200,583	111,229	(853,058)
Profit (Loss) for the year attributed to:
Controlling interests	5,074,136	10,272	(934,747)
Non-controlling interests	R$ 126447	R$ 100957	R$ 81689
Earnings (loss) per common share - (reais/share)
Basic	R$ 3.69498	R$ 0.00757	R$ 0.68876
Diluted	R$ 3.69498	R$ 0.00757	R$ 0.68876

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [abstract]
Profit (loss) for the year	R$ 5200583	R$ 111229	R$ 853058
Items that will not be subsequently reclassified to the statement of income
Actuarial (losses)/gains on defined benefit plan from investments in subsidiaries	903	(12)	87
Actuarial (losses)/gains on defined benefit pension plan	413	(203,022)	(219,417)
Income tax and social contribution on actuarial (losses) gains on defined benefit pension plan	0	(1,073)	(2,619)
Items that will not be subsequently reclassified to the statement of income	1,316	(204,107)	(221,949)
Items that could be subsequently reclassified to the statement of income
Cumulative translation adjustments for the year	(87,101)	170,342	(486,890)
Fair Value through other comprehensive income	(1,559,680)	847,849	711,942
(Loss)/Gain on percentage change in percentage of investments	(105)	2,814	1,299
(Loss) gain on cash flow hedge accounting	(1,415,962)	(50,987)	1,005,968
Cash Flow hedge reclassified to income statement	370,191	92,140	77,444
(Loss) /gain on hedge of net investments in foreign subsidiaries	(21,852)	(39,893)	77,952
(Loss) / gain on business combination	(651)	4,415	0
Items that could be subsequently reclassified to the statement of income	(2,715,160)	1,026,680	1,387,715
Other comprehensive income	(2,713,844)	822,573	1,165,766
Comprehensive income (loss) for the year	2,486,739	933,802	312,708
Attributable to:
Attributed to owners of the Company	2,360,292	832,845	231,019
Attributed to non-controlling interests	R$ 126447	R$ 100957	R$ 81689

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of cash flows [abstract]
Profit (loss) for the year	R$ 5200583	R$ 111229	R$ 853058
Adjustments to reconcile net income (loss) to net cash provided by operations
Accrued charges on borrowings and financing	1,938,077	2,346,598	2,944,558
Charges on loans and financing granted	(50,239)	(54,777)	(58,731)
Depreciation/ depletion / amortization	1,273,021	1,453,335	1,322,497
Equity in results of affiliated companies	(135,706)	(109,111)	(64,918)
Deferred income tax and social contribution	(576,895)	50,128	60,368
Provision for tax, social security, labor and civil risks	(34,279)	10,166	(25,642)
Monetary variations and exchange differences	1,023,695	250,660	(1,038,018)
Gain/(Loss) of derivative financial instruments	0	(28,503)	(5,467)
Eletrobras's compulsory loan	(21,558)	(755,151)	0
Proceeds from disposal of fixed and intangible assets	38,245	28,127	88,339
Gain on repurchase of debt securities	0	0	(146,214)
Provision (Reversal) for consumption and services	55,726	(44,921)	0
Provision for actuarial liabilities	(20,984)	(36,953)	(18,803)
PIS and COFINS credits	(2,208,462)	0	0
Gain on business combination	0	0	(66,496)
Net gain on sale of a foreign subsidiary	(1,164,294)	0	0
Gain on disposal of available for sale	0	0	(252,023)
Provision for environmental liabilities and decommissioning of assets	(55,247)	(10,051)	18,133
Impairment of Transnordestina	0	0	387,989
Updated shares - Fair value through profit or loss (VJR)	(1,655,813)	0	0
Other provisions	(43,435)	82,682	(993)
Total	3,583,993	3,293,458	2,291,521
Changes in assets and liabilities
Trade receivables - third parties	99,223	(300,449)	(388,469)
Trade receivables - related parties	22,071	14,449	(3,956)
Inventories	(800,050)	(442,109)	947,834
Receivables from related parties/Dividends	113,800	68,224	34,082
Recoverable taxes	238,181	(100,470)	275,018
Judicial deposits	(7,496)	(6,720)	38,910
Trade payables	990,942	711,953	482,009
Payroll and related taxes	(1,100)	(3,658)	(5,691)
Taxes in installments - REFIS	(23,806)	23,775	(253,374)
Payables to related parties	129,031	46,081	(9,726)
Interest paid	(2,141,710)	(2,634,931)	(3,050,036)
Interest received	0	0	19,636
Interest on swaps paid	0	0	(3,999)
Other	5,026	(97,752)	(97,841)
Increase (Decrease) in assets and liabilities	(1,375,888)	(2,721,607)	(2,015,603)
Net cash generated by operating activities	2,208,105	571,851	275,918
Investments / acquisition of shares	(218,840)	0	(190,435)
Purchase of property, plant and equipment	(1,317,102)	(1,059,481)	(1,628,694)
Receipt/(Payment) in derivative transactions	(372)	30,453	(722,443)
Purchase of intangible assets	(2,200)	(622)	(3,119)
Loans granted to related parties	(101,908)	(49,072)	(96,461)
Financial investment, net of redeemed amount	(167,773)	24,679	3,208
Loans received from related parties	0	4,819	0
Cash received by disposal of Usiminas' shares	39,377	0	0
Cash and cash equivalents from discontinued operations	0	0	331,835
Net cash received from the sale of a foreign subsidiary	1,670,359	0	0
Cash and cash equivalents on acquisition of control	0	0	941
Net cash used in investing activities	(98,459)	(1,049,224)	(2,305,168)
Borrowings and financing raised	2,143,679	534,506	22,597
Cost of borrowing	(92,287)	(238)	(26,844)
Payment of borrowings	(5,019,978)	(1,528,023)	(398,699)
Payment of dividends and interests on shareholder's equity	(502,002)	0	(53)
Treasury shares	213,402	0	0
Forfaiting funding / drawee risk	0	0	78,240
Forfaiting amortization / drawee risk	0	0	(407,155)
Buyback of debt securities	0	0	(151,098)
Net cash used in financing activities	(3,257,186)	(993,755)	(883,012)
Exchange rate changes on cash and cash equivalents of foreign subsidiaries	(16,028)	11,538	(77,628)
Increase (Decrease) in cash and cash equivalents	(1,163,568)	(1,459,590)	(2,989,890)
Cash and cash equivalents at the beginning of the year	3,411,572	4,871,162	7,861,052
Cash and cash equivalents at the end of the year	R$ 2248004	R$ 3411572	R$ 4871162

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity (Consolidated) - BRL (R$) R$ in Thousands	Paid-in Capital	Capital Reserve [Member]	Earnings Reserve [Member]	Retained Earnings (Accumulated Losses) [Member]	Other Comprehensive Income [Member]	Shareholders' Equity [Member]	Non-Controlling Interests [Member]	Total
Beginning balance at Dec. 31, 2015	R$ 4540000	R$ 30	R$ 0	R$ 367214	R$ 1790693	R$ 5963509	R$ 1127779	R$ 7091288
Total comprehensive income				(934,747)	1,165,766	231,019	81,689	312,708
Profit (loss) for the year				(934,747)		(934,747)	81,689	(853,058)
Other comprehensive income					1,165,766	1,165,766		1,165,766
Cumulative translation adjustments for the period					(486,890)	(486,890)		(486,890)
Actuarial gain/(loss) on defined benefit pension plan, net of taxes					(221,949)	(221,949)		(221,949)
Gain/(Loss) on available-for-sale assets, net of taxes					711,942	711,942		711,942
Gain/(loss) on percentage change in investments					1,299	1,299		1,299
Gain/(loss) on cash flow hedge accounting, net of taxes					1,083,412	1,083,412		1,083,412
Gain/(loss) on hedge of net investments in foreign subsidiaries					77,952	77,952		77,952
Internal changes in shareholders' equity							(19,475)	(19,475)
Non-controlling interests in subsidiaries							(19,475)	(19,475)
Ending balance at Dec. 31, 2016	4,540,000	30	0	(1,301,961)	2,956,459	6,194,528	1,189,993	7,384,521
Ajusted opening balances	4,540,000	30	0	(1,301,961)	2,956,459	6,194,528	1,189,993	7,384,521
Total comprehensive income				10,272	822,573	832,845	100,957	933,802
Profit (loss) for the year				10,272	0	10,272	100,957	111,229
Other comprehensive income				0	822,573	822,573	0	822,573
Cumulative translation adjustments for the period					170,342	170,342	0	170,342
Actuarial gain/(loss) on defined benefit pension plan, net of taxes					(204,107)	(204,107)	0	(204,107)
Gain/(Loss) on available-for-sale assets, net of taxes					847,849	847,849	0	847,849
Gain/(loss) on percentage change in investments					2,814	2,814	0	2,814
Gain/(loss) on cash flow hedge accounting, net of taxes					41,153	41,153	0	41,153
Gain/(loss) on hedge of net investments in foreign subsidiaries					(39,383)	(39,383)	0	(39,893)
Gain/(loss) on business combination					4,415	4,415	0	4,415
Internal changes in shareholders' equity							(30,094)	(30,094)
Non-controlling interests in subsidiaries							(30,094)	(30,094)
Ending balance at Dec. 31, 2017	4,540,000	30	0	(1,291,689)	3,779,032	7,027,373	1,260,856	8,288,229
Beginning balance at Dec. 31, 2017	4,540,000	30	0	(1,291,689)	3,779,032	7,027,373	1,260,856	8,288,229
Ajusted opening balances	4,540,000	30	0	(1,291,689)	3,779,032	7,027,373	1,260,856	8,288,229
Capital transactions with shareholders		32,690	180,712	(898,332)		(684,930)	0	(684,930)
Sales of treasury shares			180,712			180,712	0	180,712
Dividends				(898,332)		(898,332)	0	(898,332)
Profit on disposal of shares		32,690				32,690	0	32,690
Total comprehensive income				5,074,136	(2,713,844)	2,360,292	126,447	2,486,739
Profit (loss) for the year				5,074,136		5,074,136	126,447	5,200,583
Other comprehensive income					(2,713,844)	(2,713,844)	0	(2,713,844)
Cumulative translation adjustments for the period					(87,101)	(87,101)	0	(87,101)
Actuarial gain/(loss) on defined benefit pension plan, net of taxes					1,316	1,316	0	1,316
Gain/(Loss) on available-for-sale assets, net of taxes					(1,559,680)	(1,559,680)	0	(1,559,680)
Gain/(loss) on percentage change in investments					(105)	(105)	0	(105)
Gain/(loss) on cash flow hedge accounting, net of taxes					(1,045,771)	(1,045,771)	0	(1,045,771)
Gain/(loss) on hedge of net investments in foreign subsidiaries					(21,852)	(21,852)	0	(21,852)
Gain/(loss) on business combination					(651)	(651)	0	(651)
Constitution of reserves			2,884,115	(2,884,115)
Non-controlling interests in subsidiaries							(76,598)	(76,598)
Ending balance at Dec. 31, 2018	R$ 4540000	R$ 32720	R$ 3064827	R$ 0	R$ 1065188	R$ 8702735	R$ 1310705	R$ 10013440

1. DESCRIPTION OF BUSINESS

1. DESCRIPTION OF BUSINESS	12 Months Ended
	Dec. 31, 2018
Description Of Business
DESCRIPTION OF BUSINESS	Companhia Siderúrgica Nacional “CSN”, also referred to as the “Company”, is a publicly-held company incorporated on April 9, 1941, under the laws of the Federative Republic of Brazil (Companhia Siderúrgica Nacional, its subsidiaries, joint ventures, joint operations and associates are collectively referred to herein as the "Group”). The Company’s registered office is located in São Paulo, SP, Brazil. CSN is listed on the São Paulo Stock Exchange (B3 S.A.- Brasil, Bolsa, Balcão) and on the New York Stock Exchange (NYSE). Accordingly, the Company reports its information to the Brazilian Securities Commission (CVM) and the U.S. Securities and Exchange Commission (SEC). The Group's main operating activities are divided into five (5) operating segments as follows: · Steel: The Company’s main industrial facility is the Presidente Vargas steelworks (“UPV”), located in the city of Volta Redonda, State of Rio de Janeiro. This segment consolidates production, distribution and sale of flat steel, long steel, metallic containers and galvanized steel. In addition to the facilities in Brazil, CSN has commercial activities in the United States and operations in Portugal and Germany, all of them are in line with the plan to achieve new markets and perform excellent services for final consumers. Its steel has been used in home appliances, civil construction and automobile industries. · Mining: The production of iron ore is developed in the city of Congonhas, State of Minas Gerais. Iron ore is sold basically in the international market, especially in Europe and Asia. The prices charged in these markets are historically cyclical and subject to significant fluctuations over short periods of time, driven by several factors related to global demand, strategies adopted by the major steel producers, and the foreign exchange rate. All these factors are beyond the Company’s control. The ore transportation is accomplished by Terminal de Carvão e Minérios do Porto de Itaguai – (“TECAR”), a solid bulk terminal, one of the four terminals that compose the Port of Itaguai, located in the State of Rio de Janeiro. Imports of coal and coke are held through this terminal and directed to the steel industry of CSN. The Company´s mining activities also comprises tin exploitation, which is based in the State of Rondônia, this facility is engaged to supply the needs of UPV, with the excess of raw material being sold to subsidiaries and third parties. The Company's mining activities utilize tailings dams for which all appropriate measures are taken to mitigate the risks inherent to the handling and disposal of the tailings and to comply with current environmental legislation. It is important to reiterate that operating without dependence on these dams is a priority in our mining activities, for which investments of around R$ 250 million in dry stacking technology have already been made. In this context, it is expected that CSN Mineração will be fully processing the tailings in the dry process by the end of 2019, subject to revision of projects and expected deadlines, proper operation of equipment and unforeseen delays. As a consequence of these measures, decommissioning of dams is the natural way of processing dry tailings. All of our dams, both mining and hydroelectric dams, are positively certified and comply with the environmental legislation in force. · Cement: CSN entered in the cement market boosted by the synergy between this new activity and its existing businesses. Next to the UPV in Volta Redonda (RJ) is installed the new business unit CSN Cimentos, which produces CP-III type of cement by using slag produced by the UPV blast furnaces in Volta Redonda. It also explores limestone and dolomite at the Arcos unit, located in the State of Minas Gerais, to satisfy the needs of UPV as of the cement plant. Additionally, the operation of its second clinker production line is located in Arcos/MG. · Logistics Railroads: CSN has interests in three railroad companies: MRS Logística S.A., which manages the former Southeast Railway System of Rede Ferroviária Federal S.A (“RFFSA”)., Transnordestina Logística S.A. (“TLSA”) and FTL - Ferrovia Transnordestina Logística S.A. (“FTL”), which has the concession to operate the former Northeast Railway System of RFFSA, in the States of Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco and Alagoas, with TLSA being responsible for the rail links of Missão Velha-Salgueiro, Salgueiro-Trindade, Trindade-Eliseu Martins, Salgueiro-Porto de Suape and Missão Velha-Porto de Pecém (Railway System II), still under construction, and FTL being responsible for the rail links of São Luiz-Mucuripe, Arrojado-Recife, Itabaiana-Cabedelo, Paula Cavalcante-Macau and Propriá-Jorge Lins (Railway System I). Ports : In the State of Rio de Janeiro, by means of its subsidiary Sepetiba Tecon S.A., operates the Container Terminal (“TECON”) and by means of its subsidiary CSN Mineração, the TECAR, both located at the Itaguaí Port. Established in the harbor of Sepetiba, the mentioned port has a privileged highway, railroad and maritime access. (“TECON”) is responsible for the shipments of CSN´s steel products, movement and storage of containers, consolidation and deconsolidation of cargo; our exports of iron ore are performed using the TECAR terminal; additionally, we use the terminal for landing of coal, petroleum, coke, sulfur and zinc concentrate for our own operation and for third parties. · Energy: Since the energy supply is fundamental in CSN´s production process, the Company owns and operates facilities to generate electric power for guaranteeing its self-sufficiency. The note 26 - “Segment Information” details the financial information per each of CSN´s business segment. · Going Concern In 2018, the Company amortized principal and interest in the approximate amount of R$7.1 billion of its loans and financing. In 2019, loans and interest to be incurred next year, are expected to be paid in the approximate amount of R$3.5 billion. The financial leverage may adversely affect the businesses, financial conditions and operating results. Which can entail the following considerations: · Allocation of a substantial part of the cash generated from operations for repayment of the borrowings. · Exposure to fluctuations in interest rates due to the renegotiation of debts and new borrowings taken, and fluctuations in exchange rates since a significant part of the borrowings is denominated in foreign currency. · Increase in the economic and financial vulnerability due to adverse conditions of the industry and segment, limiting the funds available in the short term, considering the high financial leverage and the expected cash disbursements; · Limitation of the Company’s ability to enter into new businesses (acquisitions) until the financial leverage is reduced; · Limitation of the Company’s ability to obtain new credit lines under more favorable interest conditions due to the risks associated to the current financial leverage. The Company’s ability to continue operating depends, therefore, on the achievement of operating targets defined by management, in addition to refinancing of contracted debts, and/or actions related to financial deleveraging. In addition to the continuous focus on improvement in operating income, management has various actions in progress to increase the Company’s liquidity through an extension of borrowing payment terms. This plan was started in 2015, with the renegotiation of R$ 2.5 billion with Caixa Econômica Federal and R$ 2.2 billion with Banco do Brasil S.A, postponing the maturities from 2016 and 2017 to 2018 through 2022. In 2016, the Company extended the installments of certain NCE contracts amounting to R$ 100 million and prepayments of US$ 66 million with Bradesco, postponing the maturities from 2016 to 2019. Always committed to the plan to extend it debt payment term, mainly those of short term, the company’s management concluded, in February 2018, the reprofile of its debts at R$ 4.98 billion with Banco do Brasil, extending the maturity dates from 2018 to 2022 for maturities up to 2024. Still in February 2018, the company issued debt instruments (“Notes”) in the amount of US$350 million through our wholly-owned subsidiary CSN Resources S.A., with maturity date in 2023 and, in conjunction, made a repurchase offer (“Tender Offer”) of the Notes previously issued by CSN Islands XI Corp and CSN Resources S.A, having been repurchased US$350 million in Notes with maturities scheduled for 2019 and 2020. Additionally, Management studies alternatives to financial deleverage from the disposal of non-strategic assets. However, it is not possible to affirm that the sale of assets will occur within a 12-month period. Thus, the Company did not segregate and did not reclassify any assets in the financial statements as discontinued operations in accordance with IFRS 5. Based on management’s cash flow projections that covered the operational period until December 2019, which depend on factors such as the achievement of production targets, sales volumes and prices, as well as on renegotiations of borrowings, management believes that the Company has appropriate resources to continue its operations in a reasonably estimable period of time. Accordingly, the Company’s financial statements for the year ended December 31, 2018 were prepared based on the assumption of going concern.

2. SUMMARY OF SIGNIFICANT ACCOU

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	2.a) Basis of preparation and declaration of conformity The consolidated financial statements have been prepared and are being presented in accordance with International Financial Reporting Standards (“IFRS”) issued by the International Accounting Standards Board (IASB) and includes all of the relevant information of the financial statements. The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates. It also requires management to exercise its judgment in the process of applying the Company’s accounting policies. It is disclosed in the notes to this report all subjects involving a high degree of judgment or complexity, or when assumptions and estimates are significant to the consolidated financial statements, those subjects are related to the allowance for doubtful debts, provision for inventory losses, provision for labor, civil, tax, environmental and social security contingences, depreciation, amortization, depletion, provision for impairment, deferred taxes, financial instruments and employee benefits. Actual results may differ from these estimates. The financial statements are presented in thousands of Brazilian reais (R$). Depending on the applicable IFRS standard, the measurement criteria used in preparing the financial statements considers the historical cost, net realizable value, fair value or recoverable amount. When the IFRS allows us and option between acquisition cost and other measurement criteria, the acquisition cost was the criteria used. The consolidated financial statements were approved by the Board of Directors on April 4, 2019. 2.b) Consolidated financial statements The accounting policies have been consistently applied to all consolidated companies. The consolidated financial statements for the years ended December 31, 2018 and 2017 include the following direct and indirect subsidiaries, joint ventures and joint operations, as well as the exclusive funds, as follows: Equity interests (%) Companies 12/31/2018 12/31/2017 Core business Direct interest in subsidiaries: full consolidation CSN Islands VII Corp. 100.00 100.00 Financial transactions CSN Islands XI Corp. 100.00 100.00 Financial transactions CSN Islands XII Corp. 100.00 100.00 Financial transactions CSN Minerals S.L.U. (1) 100.00 Equity interests CSN Export Europe, S.L.U. (1) 100.00 Financial transactions and Equity interests CSN Metals S.L.U. (1) 100.00 Equity interests and Financial transactions CSN Americas S.L.U. (1) 100.00 Equity interests and Financial transactions CSN Steel S.L.U. 100.00 100.00 Equity interests and Financial transactions TdBB S.A (*) 100.00 100.00 Equity interests Sepetiba Tecon S.A. 99.99 99.99 Port services Minérios Nacional S.A. 99.99 99.99 Mining and Equity interests Companhia Florestal do Brasil 99.99 99.99 Reforestation Estanho de Rondônia S.A. 99.99 99.99 Tin Mining Companhia Metalúrgica Prada 99.99 99.99 Manufacture of containers and distribution of steel products CSN Gestão de Recursos Financeiros Ltda. (*) 99.99 99.99 Management of funds and securities portfolio CSN Mineração S.A. 87.52 87.52 Mining and Equity interests CSN Energia S.A. 99.99 99.99 Sale of electric power FTL - Ferrovia Transnordestina Logística S.A. 91.69 90.78 Railroad logistics Nordeste Logística S.A. 99.99 99.99 Port services Aceros México CSN (2) 0.08 Commercial representation, sales of steel and related activities CSN Inova Ltd.(3) 100.00 Advisory and implementation of new development projects Indirect interest in subsidiaries: full consolidation Companhia Siderúrgica Nacional (4) 100.00 Steel Lusosider Projectos Siderúrgicos S.A. 100.00 99.94 Equity interests and product sales Lusosider Aços Planos, S. A. 99.99 99.99 Steel and Equity interests CSN Resources S.A. 100.00 100.00 Financial transactions and Equity interests Companhia Brasileira de Latas 99.00 99.99 Sale of cans and containers in general and Equity interests Companhia de Embalagens Metálicas - MMSA 99.67 99.67 Production and sale of cans and related activities Companhia de Embalagens Metálicas - MTM 99.67 99.67 Production and sale of cans and related activities CSN Steel Holdings 1, S.L.U. 100.00 100.00 Financial transactions, product sales and Equity interests CSN Productos Siderúrgicos S.L. 100.00 100.00 Financial transactions, product sales and Equity interests Stalhwerk Thüringen GmbH 100.00 100.00 Production and sale of long steel and related activities CSN Steel Sections UK Limited (*) 100.00 100.00 Sale of long steel CSN Steel Sections Polska Sp.Z.o.o 100.00 100.00 Financial transactions, product sales and Equity interests CSN Asia Limited 100.00 100.00 Commercial representation CSN Mining Holding, S.L 87.52 87.52 Financial transactions, product sales and Equity interests CSN Mining GmbH 87.52 87.52 Financial transactions, product sales and Equity interests CSN Mining Asia Limited 87.52 87.52 Commercial representation Aceros México CSN (2) 99.92 100.00 Commercial representation, sale of steel and related activities Lusosider Ibérica S.A 100.00 99.94 Steel, commercial and industrial activities and equity interests CSN Mining Portugal, Unipessoal Lda. 87.52 87.52 Commercial and representation of products Companhia Siderúrgica Nacional, LLC (4) 100.00 Import and distribution/resale of products Direct interest in joint operations Itá Energética S.A. 48.75 48.75 Electric power generation Consórcio da Usina Hidrelétrica de Igarapava 17.92 17.92 Electric power consortium Direct interest in joint ventures MRS Logística S.A. 18.64 18.64 Railroad transportation Aceros Del Orinoco S.A. 31.82 31.82 Dormant company CBSI - Companhia Brasileira de Serviços de Infraestrutura 50.00 50.00 Equity interests and product sales and iron ore Transnordestina Logística S.A. 46.30 46.30 Railroad logistics Indirect interest in joint ventures MRS Logística S.A. 16.30 16.30 Railroad transportation Direct interest in associates Arvedi Metalfer do Brasil S.A. 20.00 20.00 Metallurgy and Equity interests (*) They are Dormant Companies therefore they do not appear in the note 9.a, where is disclosed business information under the equity method and fair value through profit or loss and comprehensive income. · Events in 2018: (1) On February 6, 2018, the Spanish commercial registry recognized the merger by absorption of the companies by CSN Steel, S.L.U., the date from which the companies were considered legally extinct, before third parties and for the purposes of commercial law, the merger is retroactive to the date of December 28, 2017; (2) Transfer of 1% stake in Aceros Mexico CSN from CSN Steel to Companhia Siderúrgica Nacional occurred on February 1, 2018. On September 18, 2018, CSN Steel increased the capital of Aceros Mexico CSN, diluting the direct interest of Companhia Siderúrgica Nacional to 0.08%, with CSN Steel holding 99.92%. On February 1, 2019, the Federal Taxpayers' Registry was canceled and, therefore, the settlement process of Aceros Mexico CSN was terminated, however, before third parties and for the purposes of commercial law, the settlement was retroactive to September 18, 2018; (3) Company incorporated in 2018. (4) On June 5, 2018 CSN LLC had its corporate name changed to "Heartland Steel Processing, LLC". On the same date, a new company was incorporated under the name "Companhia Siderúrgica Nacional, LLC", a wholly owned subsidiary of Heartland Steel Processing, LLC. On June 28, 2018, Companhia Siderúrgica Nacional, LLC., became a wholly-owned subsidiary of CSN Steel and, on June 29, 2018, Heartland Steel Processing, LLC was sold to Steel Dynamics, Inc. The remaining assets are registered at Companhia Siderúrgica Nacional, LLC, a subsidiary of CSN Steel (see note 3). · Exclusive funds Equity interests (%) Exclusive funds 12/31/2018 12/31/2017 Core business Direct interest: full consolidation Diplic II - Private credit balanced mutual fund 100.00 100.00 Investment fund Caixa Vértice - Private credit balanced mutual fund 100.00 100.00 Investment fund VR1 - Private credit balanced mutual fund 100.00 100.00 Investment fund In preparing the consolidated financial statements, we have adopted the following consolidation procedures: · Transactions between subsidiaries, associates, joint ventures and joint operations Unrealized gains on transactions with subsidiaries, joint ventures and associates are eliminated to the extent of CSN’s equity interests in the related entity by the consolidation process. Unrealized losses are eliminated in the same manner as unrealized gains, although only to the extent that there are not indications of impairment. The Company eliminates the effect on profit or loss of transactions carried out with joint ventures and, as a result, reclassifies part of the equity in results of joint ventures to financial expenses, cost of sales and income tax and social contribution. The base date to the financial statements of the subsidiaries and joint ventures is the same as of the Company, and their accounting policies are also in line with the policies adopted by the CSN. Subsidiaries Subsidiaries are all entities (including special purpose entities) which financial and operating policies can be conducted by the Company and when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to use its power to affect its returns. The existence and effect of potential voting rights that are actually exercisable or convertible are taken into consideration when assessing whether the Company controls another entity. Subsidiaries are fully consolidated from the date when the control is transferred to the Company and are deconsolidated from the date when such control ceases. Joint ventures and joint operations Joint arrangements are all entities over which the Company has joint control with one or more other parties. The investments in joint arrangements are classified as joint operations or joint ventures depending on the contractual rights and obligations of each investor. Joint operations are accounted for in the financial statements in order to represent the Company's contractual rights and obligations. Therefore, the assets, liabilities, revenues and expenses related to its interests in joint operations are accounted for individually in the financial statements. Joint ventures are accounted for under the equity method and are not consolidated. The Company eliminates the effect on profit or loss of transactions carried out with joint ventures and, as a result, eliminates part of the equity in results of joint ventures to financial expenses, cost of sales, net sales and income tax and social contribution. Associates Associates are all entities over which the Company has significant influence but not control, generally through a shareholding percentage from 20% up to 50% of the voting rights. Investments in associates are accounted for under the equity method and are initially recognized at cost. · Transactions and non-controlling interests The Company treats transactions with non-controlling interests as transactions with owners of the Company. For purchases from non-controlling interests, the difference between any consideration paid and the relevant share acquired of the carrying value of subsidiary net assets is recorded in shareholders' equity. Gains and losses on disposals to non-controlling interests are also recognized directly in shareholders' equity. When the Company no longer holds control, any retained interest in the entity is remeasured to its fair value, with the change in the carrying amount recognized in profit or loss. The fair value is the initial carrying amount for the purposes of subsequently accounting for the retained interest in an associate, joint venture or financial asset. In addition, any amounts previously recognized in other comprehensive income in respect of that entity are accounted for as if the Company had disposed of the related assets or liabilities. This may mean that amounts previously recognized in other comprehensive income are reclassified to profit or loss. 2.c) Foreign currencies i. Functional and presentation currency Items included in the financial statements are related to each one of the Company's subsidiaries are measured using the currency of the primary economic environment in which the subsidiary operates (“functional currency”). The consolidated financial statements are presented in Brazilian reais (R$), which is the Company’s functional currency and the Group’s presentation currency. ii. Transactions and balances According to IAS 21 – The effects of changes in foreign exchange rates, transactions in foreign currencies are translated into the functional currency using the exchange rates in effect at the dates of the transactions or valuations when their values are remeasured. Foreign exchange gains and losses resulting from the settlement of those transactions and from the translation at exchange rates in effect as of December 31, 2018 related to monetary assets and liabilities denominated in foreign currencies are recognized in the income statement, except when they are recognized in shareholders' equity as a result of foreign operation characterized as foreign investment. According to IAS 21 and IFRIC 22 – foreign currency transactions and advance consideration, the transactions in which the Company recognizes a non-monetary asset or non-monetary liability involving prepayments or receipts in foreign currency are recorded at the exchange rate of the date the entity initially recognized (transaction date) the non-monetary asset or non-current liability monetary. The balances of assets and liabilities are translated by exchange rates prevailing at the end of the reporting period. As of December 31, 2018, US$1 is equal to R$3.8748 (R$3.3080 at December 31, 2017) and €1 is equal to R$4.4390 (R$3.9693 at December 31, 2017), according to the rates obtained from Central Bank of Brazil website. All other foreign exchange gains and losses, including foreign exchange gains and losses related to borrowings and cash and cash equivalents, are presented in the income statement as financial income or expenses. iii. Group companies The results and financial position of all the Group’s entities (none of which has the currency of a hyper-inflationary economy) that have a functional currency different from the presentation currency are translated into the presentation currency as follows: · The assets and liabilities of each balance sheet presented are translated by exchange rate at the end of the reporting period; · The income and expenses of each income statement are translated at average exchange rates (unless this average is not a reasonable approximation of the cumulative effect of the rates at the transaction dates, in which case income and expenses are translated at the rate in effect at the transaction dates); · All resulting exchange differences are recognized as a separate component in other comprehensive income; and · Gains and losses accumulated in shareholders' equity are included in the income statement when the foreign operation is partially disposed or sold. 2.d) Cash and cash equivalents Cash and cash equivalents include cash on hand, in bank accounts and other short-term highly liquid investments redeemable within 90 days from the end of the reporting period, readily convertible into a known amount of cash and subject to an insignificant risk of change in value. Bank certificates of deposit and government securities that do not meet the above criteria are not considered cash equivalents and are classified as financial investments, according to note 5. 2.e) Trade receivables Trade receivables are initially recognized at fair value, including the related taxes and expenses, being foreign currency-denominated trade receivables are adjusted at the exchange rate in effect at the end of the reporting period. The accounts receivable with a receipt period of more than 90 days are subject to a present value adjustment and analysis regarding the operation. With the adoption of the new IFRS 9 - Financial instruments, the Company started to apply the new model of expected losses, where it considers all possible loss events over the life of its receivables. These expected credit losses are estimated according to the loss rate by maturity range adopted by the Company since the initial (recognition) date of the asset. The Company considers customer history, default rate, financial situation and the position of its legal advisors to estimate the expected credit losses. 2.f) Inventories Inventories are carried at the lower of cost and net realizable value. Cost is determined using the weighted average cost method on the acquisition of raw materials. The costs of finished goods and work in process comprise raw materials, labor and other direct costs (based on the normal production capacity). Net realizable value represents the estimated selling price in the normal course of business, less estimated costs of completion and costs necessary to make the sale. The allowance for estimated losses on slow-moving or obsolete inventories are recognized when considered necessary. Stockpiled ore inventories are accounted for as processed when removed from the mine. The cost of finished goods comprises all direct costs necessary to transform stockpiled inventories into finished goods. 2.g) Investments Investments in subsidiaries, joint ventures and associates are accounted for under the equity method of accounting and are initially recognized at cost. The gains or losses are recognized in profit or loss as operating income (or expenses). In the case of foreign exchange differences arising on translating foreign investments that have a functional currency different from the Company’s, changes in investments due exclusively to foreign exchange differences, as well as adjustments to pension plans and investments that impact the subsidiaries’ shareholders' equity, are recognized in line item “Cumulative translation adjustments”, in the Company’s shareholders' equity, and are only recognized in profit or loss when the investment is disposed or written off due to impairment loss. Other investments are recognized at cost or fair value. When necessary, the accounting policies of subsidiaries, joint ventures and associates are changed to ensure consistency with the policies adopted by the Company. 2.h) Business combination The acquisition method is used to account for on each business combination conducted by the Company. The consideration transferred by acquiring an entity is measured by the fair value of the assets transferred, liabilities incurred, and equity instruments issued by the Company. The consideration transferred includes the fair value of any asset or liability resulting from a contingent consideration arrangement, where applicable. Acquisition-related costs are recognized in profit or loss for the year, as incurred. Identifiable assets acquired, and liabilities assumed in a business combination are initially measured at their fair values at the acquisition date. 2.i) Property, plant and equipment Property, plant and equipment are carried at cost of acquisition, formation or construction, less accumulated depreciation or depletion and any impairment loss. Depreciation is calculated under the straight-line method based on the remaining economic useful economic lives of assets, as mentioned in note 10. The depletion of mines is calculated based on the quantity of ore mined. Land is not depreciated since their useful life is considered indefinite. However, if the tangible assets are mine-specific, that is, used in the mining activity, they are depreciated over the shorter between the normal useful lives of such assets and the useful life of the mine. The Company recognizes in the carrying amount of property, plant and equipment the cost of replacement, and consequently reducing the carrying amount of the part that is replaced if it is probable that future economic benefits embodied therein will revert to the Company, and if the cost of the asset can be reliably measured. All other disbursements are expensed as incurred. Borrowing costs related to funds obtained for construction in progress are capitalized until these projects are completed. If some components of property, plant and equipment have different useful lives, these components are accounted for in separate line items of property, plant and equipment. Gains and losses on disposal are determined by comparing the sale value less the residual value and are recognized in ‘Other operating income (expenses)’. Exploration expenditures are recognized as expenses until the viability of mining activities is established; after this period the subsequent development costs are capitalized. Exploration and valuation expenditures include: · Research and analysis of historical data related to area exploration; · Topographic, geological, geochemical and geophysical studies; · Determine the mineral asset’s volume and quality/grade; · Examine and test the extraction processes and methods; · Topographic surveys of transportation and infrastructure needs; · Market and financial studies; The development costs from new mineral deposits or from capacity expansion in mine operations are capitalized and amortized using the produced (extracted) units’ method based on the probable and proven ore quantities. The development stage includes: · Drillings to define the ore body; · Access and draining plans; · Advance removal of overburden (top soil and waste material removed prior to initial mining of the ore body) and waste material (non-economic material that is intermingled with the ore body). Stripping costs (the costs associated with the removal of overburden and other waste materials) incurred during the development of a mine, before production commences, they are capitalized as part of the depreciable cost of developing the property. Such costs are subsequently amortized over the useful life of the mine based on proven and probable reserves. Stripping costs in the production phase are included in the cost of the inventory produced, except when a specific extraction campaign is made to access deeper deposits where ore body is located. In these cases, costs are capitalized and taken to noncurrent assets when the mineral ore deposit is extracted and are amortized over the useful life of the ore body. The Company holds spare parts that will be used to replace parts of property, plant and equipment and that used to increase the asset’s useful life when it exceeds 12 months. These spare parts are classified in property, plant and equipment and not in inventories. 2.j) Intangible assets Intangible assets comprise assets acquired from third parties, including through business combinations. These assets are recognized at cost of acquisition or formation, less amortization calculated on a straight-line basis on the exploration or recovery periods estimated. Mineral rights acquired are classified in line item ‘’other assets’’ in intangible assets. Intangible assets with indefinite useful lives and goodwill based on expected future profitability are not amortized. · Goodwill Goodwill represents the positive difference between the amount paid and/or payable for the acquisition of a business and the net fair values of the acquiree´s assets and liabilities. Goodwill on acquisitions from business combination is recognized as intangible assets in the consolidated financial statements. The gain on purchase is recognized as a gain in profit for the period at the acquisition date. Goodwill is annually tested for impairment. Impairment losses on goodwill are not reversed. Gains and losses on the disposal of a Cash-Generating Unit (CGU) include the carrying amount of goodwill related to the CGU sold. Goodwill is allocated to CGUs for impairment testing purposes. The allocation is made to CGUs or group of CGUs that are expected to benefit from the business combination in which the goodwill arose, and if that unit is not greater than the operating segment. · Software Software licenses purchased are capitalized based on the costs incurred to purchase the software and make it ready for use. These costs are amortized on a straight-line basis over the estimated useful lives in up to 10 years. 2.k) Impairment of non-financial assets Assets with infinite useful lives, such as goodwill, are not subject to amortization and are annually tested for impairment. Assets subject to amortization and/or depreciation, such as property, plant and equipment, are tested for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. An impairment loss is recognized at the amount at which the carrying amount of the asset exceeds its recoverable amount. The recoverable amount is the higher of the fair value of an asset less costs to sell and its value in use. For impairment testing purposes, assets are grouped at their lowest levels for which there are separately identifiable cash flows (Cash Generating Units, or CGUs). Non-financial assets, except for goodwill, are subsequently reviewed for possible reversal of the impairment at the reporting date. 2.l) Employee benefits i. Employee benefits Defined contribution plans A defined contribution plan is as a post-employment benefit plan whereby an entity pays fixed contributions to a separate entity (pension fund) and will not have any legal or constructive obligation to pay additional amounts. Obligations for contributions to defined contribution pension plans are recognized as employee benefit expenses in the periods during which services are provided by employees. Contributions paid in advance are recognized for an asset since it is agreed that either cash reimbursement or future reduction on payables will flow back to CSN. Contributions to a defined contribution plan that is expected to mature twelve (12) months after the end of the period in which the employee provides services are discounted to their present values. Defined benefit plans A defined benefit plan is a post-employment benefit plan other than a defined contribution plan. The Company’s net obligation regarding defined pension benefit plans is calculated individually for each plan by estimating the value of the future benefit that the employees accrue as return for services provided in the current period and in prior periods; such benefit is discounted to its present value. The discount rate is the yield presented at the end of the reporting period for top line debt securities whose maturity dates approximate the terms and conditions of the Company’s obligations and which are denominated in the same currency as the one in which it is expected that the benefits will be paid. The calculation is made annually by a qualified actuary using the projected unit credit method. When the calculation results in a benefit for the Company, the asset to be recognized is limited to the total amount of any unrecognized costs of past services and the present value of the economic benefits available in the form of future plan reimbursements or reduction in future contributions to the plan. The present value of economic benefits is calculated taking into account the funding requirements applicable to the Company’s plans. An economic benefit is available to the Company if it is realizable during the life of the plan or upon settlement of the plan’s liabilities. The Company and some of its subsidiaries offered a postretirement healthcare benefit to its employees. The right to these benefits is usually contingent to their remaining in employment until the retirement age and the completion of the minimum length of service. The expected costs of these benefits are accumulated during the employment period, and are calculated using the same accounting method used for defined benefit pension plans. These obligations are annually valued by qualified independent actuaries. When the benefits of a plan are increased, the portion of the increased benefit related to past services of employees is recognized in profit or loss until the benefits become vested. When benefits became vesting rights, all actuarial gains or losses are immediately recognized in profit or loss. The Company recognizes all actuarial gains or losses resulting from defined benefit plans immediately in other comprehensive income. If the plan is extinguished, actuarial gains and losses are recognized in profit or loss. ii. Profit sharing and bonus Employee profit sharing and executives’ variable compensation are linked to the achievement of operating and financial targets. The Company recognizes a liability and an expense substantially allocated to production cost and, where applicable, to general and administrative expenses when such goals are met. 2.m) Provisions Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that the Company will be required to settle the obligation and it has reliable cost estimation. The amount recognized as a provision is the best value estimation required to settle the present obligation at the end of the reporting period, taking into account the risks and uncertainties surrounding the obligation. When a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows (when the effect of the time value of money is material). Success fees are accrued to the extent that they make it probable that disbursements will occur. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, a receivable is recognized as an asset if it is probable that reimbursement will be received and that the amount of the receivable can be measured reliably. 2.n) Concessions The Company has governmental concessions to provide the following types of services: railway and port transportation managed by Company´s subsidiaries and joint-ventures. The concessions included in the consolidated financial statements are related to the rail network in the Northeast area, managed by the subsidiary FTL, the container terminal in Itaguaí, managed by the subsidiary Sepetiba Tecon and the port terminal TECAR for exporting ore and importing coal, which is managed by the subsidiary CSN Mineração. The Company´s concession contracts are not within the scope of IFRIC12 – Service Concession Arrangements, considering that the grantor (refers to the government) has effectively no control over what, to whom and at what price the services will be provided by the dealer (refers to the private part) to the customers. In essence, all concession contracts have operating leasing characteristics. Therefore, the accounting should follow the accounting rules applicable to leases, according IAS 17 - Leases. Our concession agreements provide for the use of a specific asset for an agreed period of time, but without any transfer of ownership to the Company or option to buy these assets after the completion of these contracts. Payments made under operating leases are recognized in the income statement on a straight-line basis over the period of the contracts. There are assets related to our concessions which are subject to reversion to the grantor at the end of the concession agreement. The residual carrying amounts of these assets on December 31, 2018 are listed below with an indication of their classification in our financial statements: Concession Net book value (R$) Classification in balance sheet Sepetiba Tecon S.A. (TECON) 347 million Fixed assets and intangible (Software) Tecar (CSN Mineração) 1,616 million Fixed assets and intangible (Software) FTL - Ferrovia Transnordestina Logística S.A. (FTL) 227 million Fixed assets Transnordestina logística S.A. (TLSA) 8,439 million (1) Investment (1) The amount of fixed and intangible assets is recognized in TLSA’s financial statements. The Company recognizes its interest in the assets under the equity method. 2.o) Share capital Common shares are classified in shareholders' equity. Incremental costs directly attributable to the issue of new shares or options are shown in shareholders' equity as a deduction to the amount received, net of taxes. When any Company of the Group buys Company shares (treasury shares), the amount paid, including any directly additional costs (net of income tax), is deducted from shareholders' equity attributable to owners of the Company until the shares are canceled or sold. When these shares are subsequently sold, any amount received, net of any directly attributable additional transaction costs

3. SALE OF FOREIGN SUBSIDIARY

3. SALE OF FOREIGN SUBSIDIARY	12 Months Ended
	Dec. 31, 2018
Sale Of Foreign Subsidiary
SALE OF FOREIGN SUBSIDIARY	During the second quarter of 2018, Companhia Siderúrgica Nacional ("CSN") announced to its shareholders and to the market, through a Material Fact, the sale by its wholly-owned subsidiary CSN Steel S.L.U., total interest in Heartland Steel Processing, LLC, new corporate name of Companhia Siderúrgica Nacional LLC ("LLC") to Steel Dynamics, Inc. ("SDI"), approved on the same date by the Board of Directors. The LLC is located in the United States with operations in stripping, cold rolling and galvanizing of flat steel. Still in the second quarter of 2018, after fulfilling all the precedent conditions foreseen in the purchase and sale agreement entered into with SDI, the Company concludes the transaction with the transfer of the equity interest and receipt of the base value of the transaction, adjusted in US$ 400 million, as shown below: 06/30/2018 Change in working capital In 2018 U$$ R$ U$$ R$ R$ Receipt from disposal of the investment 395,661 1,525,590 1,525,590 Deposit in Warranty 2,000 7,712 7,712 Contractual expenses and fees (d) 2,339 9,021 9,021 Basis price for alienation (a) 400,000 1,542,323 1,542,323 Working Capital Receivable (b) (*) 34,008 131,127 3,581 14,402 145,529 Shareholder's Equity da LLC (c) 133,445 514,537 514,537 Net gain of alienation = (a+b-c-d) 298,224 1,149,892 3,581 14,402 1,164,294 (*) The final value of the transaction was subject to post-closing adjustment of working capital, which was completed in September 2018. The working capital of LLC ascertained and received was US$37,589 equivalent to R$145,529. The sale of LLC generated a cumulative gain in the year of 1,164,294 (see note 24). The net investment, results and cash flows from the sale of the investment are summarized below: 3.a) Balance sheet LLC 06/30/2018 ASSETS Current Assets 418,014 Cash and cash equivalents 760 Trade Receivable 114,266 Inventory 299,373 Other current assets 3,615 Non-current assets 191,431 Other non-current assets 205 Property, plant and equipment 191,226 TOTAL ASSETS 609,445 LIABILITIES Current Liabilities 89,810 Borrowings and Financing 5,446 Social and Labor obligations 5,526 Trade payables 76,400 Tax payables 1,398 Other payables 1,040 Non-current liabilities 5,098 Borrowings and Financing 5,098 Shareholders' equity (disposal) 514,537 TOTAL LIABILITIES 609,445 3.b) Statement of Income 06/30/2018 06/30/2017 Net Revenues 997,061 472,409 Cost from sale of goods and rendering of services (888,850) (388,322) Gross profit 108,211 84,087 Selling expenses (24,650) (10,521) General and administrative expenses (15,649) (9,531) Other operating expenses, net (844) (358) Profit before financial income (expenses) 67,068 63,677 Financial income (expenses), net (2,641) (428) Profit (loss) before taxes 64,427 63,249 Income tax and Social Contribution (1,730) - Profit (loss) for the period 62,697 63,249 3.c) Statement of Cash Flows 06/30/2018 06/30/2017 Net cash provided by (used) by operating activities 149,691 (69,216) Net cash provided by (used) by investing activities (6,269) (2,492) Net cash provided by (used) by financing activities (176,592) (1,860) Increase (decrease) in cash and cash equivalents for the period (33,170) (73,568) Cash and equivalents at the beginning of the year 33,930 112,428 Cash and equivalents at the end of the year 760 38,860 Net revenue receipts from sale of subsidiary LLC In 2018 Net cash received from the sale of the asset 1,525,590 Cash and cash equivalents transferred on the sale of the assets (760) Working capital received 145,529 Net cash provided by the sale of assets 1,670,359

4. CASH AND CASH EQUIVALENTS

4. CASH AND CASH EQUIVALENTS	12 Months Ended
	Dec. 31, 2018
Cash and cash equivalents [abstract]
CASH AND CASH EQUIVALENTS	Consolidated 12/31/2018 12/31/2017 Current Cash and cash equivalents Cash and banks 1,124,714 193,702 Short-term investments In Brazil: Government securities 10,247 12,100 Private securities 609,480 644,525 619,727 656,625 Abroad: Time deposits 503,563 2,561,245 Total short-term investments 1,123,290 3,217,870 Cash and cash equivalents 2,248,004 3,411,572 The funds available established in Brazil, are basically invested in repurchase agreements and Bank Certificate of Deposit (“CDBs”) and yield interest based on the floating of Certificates of Interbank Deposits (“CDI”) and government securities are basically repurchase agreements backed by National Treasury Notes. The Company invests part of the resources through the exclusive investment funds, whose financial statements have been consolidated in the Company.The funds are managed by BNY Mellon Serviços Financeiros DTVM S.A. and Caixa Econômica Federal (CEF). The funds available abroad are invested in time deposits

5. FINANCIAL INVESTMENTS

5. FINANCIAL INVESTMENTS	12 Months Ended
	Dec. 31, 2018
Financial Investments
FINANCIAL INVESTMENTS	Consolidated Current Non-Current 12/31/2018 12/31/2017 12/31/2018 CDB - Certificate of bank deposit 882,376 716,218 Government securities (2) 13,337 19,494 Time Deposit (3) 7,772 895,713 735,712 7,772 (1) Financial investment linked to Bank Certificate of Deposit to secure a letter of guarantee of certain loans. (2) Investments in National Treasury Bills (LFT) managed by its exclusive funds. (3) Investments in Time Deposit in custody to cover additional expenses of the sale of LLC.

6. TRADE RECEIVABLES

6. TRADE RECEIVABLES	12 Months Ended
	Dec. 31, 2018
Trade Receivables
TRADE RECEIVABLES	Consolidated 12/31/2018 12/31/2017 Trade receivables Third parties Domestic market 1,369,396 1,290,823 Foreign market 852,821 982,846 2,222,217 2,273,669 Allowance for doubtful debts (237,352) (191,979) 1,984,865 2,081,690 Related Parties (note 19 b) 93,317 115,388 2,078,182 2,197,078 In accordance with Group’ internal sales policy the Group performs operations relating to assignment of receivables without co-obligation in which, after assigning the customer’s trade notes/bills and receiving the amounts from each transaction closed, CSN settles the trade receivables and becomes entirely free of the credit risk on the transaction. In the consolidated, this transaction totals R$46,210 as of December 31, 2018 (R$186,827 as of December 31, 2017). The breakdown of gross trade receivables from third parties is as follows: Consolidated 12/31/2018 12/31/2017 Current 1,514,847 1,391,839 Past-due up to 30 days 177,287 167,760 Past-due up to 180 days 47,684 142,346 Past-due over 180 days 482,399 571,724 2,222,217 2,273,669 The movements in the Group’s allowance for doubtful debts are as follows Consolidated 12/31/2018 12/31/2017 Opening balance (191,979) (172,782) Expected credit losses (53,706) (36,697) Recovery of receivables 8,333 17,500 Closing balance (237,352) (191,979) With the adoption of IFRS 9 - Financial Instruments, the Company changed the model as from January 1, 2018 from "losses incurred" to "expected credit losses", where it began to constitute the impairment from the date of recognition of the assets (accounts receivable to expire). The application of IFRS 9 did not bring material impacts to the Company.

7. INVENTORIES

7. INVENTORIES	12 Months Ended
	Dec. 31, 2018
Inventories Abstract
INVENTORIES	Consolidated 12/31/2018 12/31/2017 Finished goods 1,362,981 1,308,802 Work in progress 1,122,933 1,135,589 Raw materials 1,560,499 1,050,588 Spare parts 856,097 814,725 Iron ore 258,612 278,041 Advances to suppliers 36,192 12,514 (-) Provision for losses (157,754) (135,840) 5,039,560 4,464,419 The movements in the provision for inventory losses are as follows: Consolidated 12/31/2018 12/31/2017 Opening balance (135,840) (101,176) (Estimated losses) / Reversal of inventories with low turnover and obsolescence (21,914) (34,664) Closing balance (157,754) (135,840)

8. OTHER CURRENT AND NON-CURREN

8. OTHER CURRENT AND NON-CURRENT ASSETS	12 Months Ended
	Dec. 31, 2018
Other Current And Non-current Assets
OTHER CURRENT AND NON-CURRENT ASSETS	The group of other current and non-current assets is comprised as follows: Consolidated Current Non-current 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Judicial deposits (note 17) 347,950 339,351 Credits with the PGFN (1) 46,774 46,774 Recoverable taxes (2) 1,412,335 866,986 1,822,388 401,071 Prepaid expenses 49,830 50,078 49,808 30,741 Actuarial assets - related parties (Note 19 b) 99,894 111,281 Derivative financial instruments (note 13 I) 351 Securities held for trading (note 13 I) 4,503 2,952 Iron ore inventory (3) 144,499 144,499 Northeast Investment Fund – FINOR 26,598 26,598 Loans with related parties (notes 19 b and 13 I) 2,675 2,441 706,605 554,694 Other receivables from related parties (Note 19 b) 3,649 3,577 218,840 30,770 Other receivables (note 13 I) 7,451 20,024 Principal and monetary adjustment related to the Eletrobrás' compulsory loan (Note 13 I) (4) 813,428 784,741 Dividends receivable (note 19b) (*) 46,171 41,528 Employee debt (*) 31,645 33,942 Sea freight (5) 117,156 Other receivables (*) 12,753 3,667 Others 71,956 67,544 988 37,931 1,753,024 1,072,715 4,285,223 2,528,475 (*) In December 2018, the Company reclassified the balances from 2017 related to Dividends receivable, Employee Debits and Other Receivables to Other Current and Non-Current Assets. Previously, the amounts were presented in the note ‘Accounts Receivable’. (1) Refers to the excess of judicial deposit originated by the 2009 REFIS (Tax Debt Refinancing Program). (2) Refers mainly to PIS / COFINS, ICMS recoverable and income and social contribution taxes to be offset. On September 20, 2018, res judicata the writ of mandamus and special appeal filed in 2006, in which CSN and Federal Union were parties, related to the discussion about the non-inclusion of ICMS in the calculation base of PIS and COFINS, confirmed the CSN's right to offset the amounts unduly paid under these taxes from 2001 to 2013. In this way, the Company recognized in 2018 the amount of R$ 2,208,462, under "Taxes recoverable", being in the current assets R$ 793,516 and in the noncurrent R$ 1,414,945 and in the "Other Operating" account, was recognized the amount of R$ 1,102,365, see note 24, and R$ 1,106,097 as "Financial Result", see note 25. (3) Long-term iron ore inventories that will be used after the construction of the processing plant, which will produce pellet feed, expected to start operating in the first half of 2020. (4) This is a certain and due amount, arising from the res judicata favorable decision to the Company, which is irreversible and irrevocable, in order to apply the STJ's consolidated position on the subject, which culminated in the conviction of Eletrobrás to the payment of the correct interest and monetary adjustment of the Compulsory Loan. The res judicata decision, as well as the certainty about the amounts involved in the liquidation of the sentence (judicial procedure to request the satisfaction of the right), allowed the conclusion that the entry of this value is certain. (5) Refers to payment of freight expenses and marine insurance on unrecognized sales revenues, following the guidelines of IFRS15, the freight in incoterms "CIF" is considered a distinct performance obligation and for these, there’s no conclusion about the delivery process in December 31, 2018, but the transport service provider had already been paid.

9. INVESTMENTS

9. INVESTMENTS	12 Months Ended
	Dec. 31, 2018
Investment Abstract
INVESTMENTS	· Reduction of financial leverage With the primary objective of reducing the Company’s financial leverage, Management is committed to a plan to dispose of a set of assets, however, it is not possible to confirm that the sale within a period of 12 months is highly probable for any of the assets contemplated. The Company considers several sales scenarios that vary according to different macroeconomic and operational assumptions. In this context, the Company did not segregate and did not reclassify such assets in the financial statements as discontinued operations in accordance with IFRS 5. 9.a) Investments in joint ventures, joint operations, associates and other investments 12/31/2018 12/31/2017 Companies Number of shares (in units) Participation in Participation in % equity interest Assets Liabilities Fair Value Allocation Net income / (loss) for the year % equity interest Assets Liabilities Fair Value Allocation Net income / (loss) for the year Shareholders’ equity Shareholders’ equity Joint-venture and Joint-operation MRS Logística S.A.(*) 126,716,070 37.27 3,125,912 1,693,200 1,878,095 194,403 37.27 3,039,761 1,714,729 1,782,162 171,905 CBSI - Companhia Brasileira de Serviços de Infraestrutura 1,876,146 50.00 25,941 19,997 5,944 4,501 50.00 16,005 13,654 2,351 1,785 Transnordestina Logística S.A. 24,168,304 46.30 4,065,604 2,883,851 1,181,753 271,116 (20,429) 46.28 3,806,380 2,604,198 1,202,182 271,116 (21,357) 7,217,457 4,597,048 3,065,792 271,116 178,475 6,862,146 4,332,581 2,986,695 271,116 152,333 Associates Arvedi Metalfer do Brasil 46,994,971 20.00 40,712 26,308 14,404 (5,087) 20.00 43,653 23,978 19,675 (4,368) 40,712 26,308 14,404 (5,087) 43,653 23,978 19,675 (4,368) Classified as fair value through profit or loss and comprehensive income (Note 13 I) Usiminas 2,250,623 2,200,459 Panatlântica 28,566 21,974 2,279,189 2,222,433 Other Investments 112 76 Total Investments 5,359,497 271,116 5,228,879 271,116 5,630,613 5,499,995 (*) On December 31, 2018 and 2017, the Company directly owned 26,611,282 common shares, 2,673,312 Class A preferred shares and 34,092,604 Class B preferred shares, totaling 36,765,916 preferred shares and indirectly through its subsidiary CSN Mineração 25,802,872 common shares, 37,536,000 Class A preferred shares of MRS Logística S.A.; The number of shares, the carrying amounts of assets, liabilities and shareholders’ equity, and the amounts of profit or loss for the year refer to the equity interests held by CSN in those companies. 9.b) Changes of investments balances in joint ventures, joint operations, associates and other investments Consolidated 12/31/2018 12/31/2017 Opening balance of investments 5,499,995 4,568,451 Opening balance of loss provisions Capital increase 20,579 Dividends (87,846) (79,189) Comprehensive income (1) 272 850,640 Equity in results of affiliated companies (2) 173,145 147,800 Receipt of sale - Usiminas' shares (39,377) Update of shares measured at Fair Value through profit or loss (VJR) (note 13 II) 96,133 Amortization of fair value – investment in MRS (11,746) (11,746) Others 37 3,460 Closing balance of investments 5,630,613 5,499,995 (1) Refers to the marked-to-market of investments classified at fair value through profit or loss, translation to the reporting currency of the foreign investments of which functional currency is not the Brazilian Reais, actuarial gain/loss and gain/loss on net investment hedge from investments measured by equity method. (2) The table below shows the reconciliation of the equity in results of affiliated companies included on investment balance with the amount disclosed in the income statement and it is due to the elimination of the results of the CSN´s transactions with these companies Consolidated 12/31/2018 12/31/2017 Equity in results of affiliated companies MRS Logística S.A. 194,403 171,905 CBSI - Companhia Brasileira de Serviços de Infraestrutura 4,501 1,785 Transnordestina Logística S.A. (20,429) (21,357) Arvedi Metalfer do Brasil S.A. (5,087) (4,368) Others (243) (165) 173,145 147,800 Eliminations To cost of sales (42,806) (40,823) To taxes 14,554 13,880 Others Amortization of fair value – investment in MRS (11,746) (11,746) Others 2,559 Equity in results adjusted 135,706 109,111 9.c) Additional information about the main operating subsidiaries · SEPETIBA TECON S.A. (“Tecon”) The Container Terminal was created to exploit the terminal n o Tecon won a bidding procedure and entered into the lease agreement in October 23, 1998 for operation of the port terminal for a period of 25 years, extendable for an equal period. Upon termination of the lease, it will return to the Union as well as all the rights and privileges transferred to Tecon, along with the ownership of assets and those resulting from investments, declared reversible by the Federal Government for being necessary to the continuity of terminal´s operation. The reversible assets will be indemnified by the Federal Government at the residual value of cost, based on the accounting records of Tecon after deducting depreciation. · ESTANHO DE RONDÔNIA S.A. (“ERSA”) Headquartered in the state of Rondônia, the subsidiary operates two units, which are based in the cities of Itapuã do Oeste/RO and Ariquemes/RO. In Itapuã do Oeste is extracted the cassiterite (tin ore) and in Ariquemes is located the casting operation, where the metallic tin is made, which is the raw material used in UPV for the production of tin plates. · COMPANHIA METALÚRGICA PRADA (“Prada”) Prada operates in the area of two segments: steel metal packaging, production and processing and distribution of flat steel. Metal packaging In the steel metal packaging segment, Prada produces its supply chain includes the chemical and food segments, providing packaging and printing services to leading companies in the market. Distribution Prada is a player in the market of processing and distribution regarding flat steel products, with a diversified product line. It provides coils, rolls, strips, blanks, metal sheets, profiles, tubes and tiles, among other products, to the most different industry segments - from automotive to construction. It is also specialized in providing service steel processing, meeting the demand of all national companies. · CSN ENERGIA S.A. Its main objective is the distribution of the excess electric power generated by CSN and Companies, consortiums or other entities in which CSN holds an interest. · FTL - FERROVIA TRANSNORDESTINA LOGÍSTICA S.A. (“FTL”) FTL was created on the purpose of incorporating the spun-off portion of Transnordestina Logística S.A, the Company holds the concession to operate the railway cargo transportation, the public service is provided in northeastern Brazil, which includes the railway between the towns of Sao Luis to Mucuripe, Arrojado to Recife, Itabaiana to Cabedelo, Paula Cavalcante to Macau and Propriá to Jorge Lins ("Network I"). As of May 2018, the CSN subscribed shares by capitalization of advances for future capital increase amounting R$ 33,633, therefore its participation in the share capital of the company increased from 90.78% to 91.69%. As a result of the operations described above that caused a change in the shareholder’s participation, the Company recorded a loss in the amount of R$(104) recorded in shareholders' equity in other comprehensive income. · CSN MINERAÇÃO S.A. (“CSN Mineração”) Headquartered in Congonhas, Minas Gerais, it is primarily engaged in the production, purchase and sale of iron ore. CSN Mineração S.A. commercializes its products mainly in the overseas market. From November 30,2015, the CSN Mineração S.A. has centralized mining operations of CSN, including the establishments of the mine Casa de Pedra, the port TECAR and the participation of 18.63% in MRS. The participation of the CSN in this subsidiary is 87.52%. · MINÉRIOS NACIONAL S.A. (“Minérios Nacional”) Headquartered in Congonhas, Minas Gerais, Mineração Nacional is mainly engaged in the production and commercialization of iron ore. This subsidiary concentrates the mining rights assets related to the Fernandinho, Cayman and Casa de Pedra mines transferred to this subsidiary in the business combination process that took place in 2015. 9.d) Joint ventures and joint operations financial information The balances of the balance sheets and income statements of joint venture and joint operation are presented as follows and refer to 100% of the companies´ profit/loss: 12/31/2018 12/31/2017 Joint-Venture Joint-Operation Joint-Venture Joint-Operation Equity interest (%) MRS Logística CBSI Transnordestina Logística Itá Energética MRS Logística CBSI Transnordestina Logística Itá Energética 34.94% 50.00% 46.30% 48.75% 34.94% 50.00% 46.30% 48.75% Balance sheet Current assets Cash and cash equivalents 345,962 2,091 19,234 29,870 484,978 101 5,763 16,231 Advances to suppliers 17,750 73 1,734 937 14,911 37 22 Other current assets 736,768 41,284 108,851 16,718 685,311 28,475 49,494 16,447 Total current assets 1,100,480 43,448 129,819 47,525 1,185,200 28,613 55,257 32,700 Non-current assets Other non-current assets 804,570 2,111 222,630 25,840 693,434 974 238,004 27,459 Investments, PP&E and intangible assets 6,482,292 6,324 8,428,567 457,578 6,277,550 2,423 7,927,881 484,406 Total non-current assets 7,286,862 8,435 8,651,197 483,418 6,970,984 3,397 8,165,885 511,865 Total Assets 8,387,342 51,883 8,781,016 530,943 8,156,184 32,010 8,221,142 544,565 Current liabilities Borrowings and financing 422,793 4,350.0000 75,906 668,947 1,411 52,691 Other current liabilities 1,368,290 33,844 179,816 18,298 1,272,365 25,898 113,739 33,666 Total current liabilities 1,791,083 38,194 255,722 18,298 1,941,312 27,309 166,430 33,666 Non-current liabilities Borrowings and financing 2,111,518 1,262 5,754,073 2,084,422 5,457,768 Other non-current liabilities 640,535 539 218,839 15,113 575,170 434 3,471 Total non-current liabilities 2,752,053 1,801 5,972,912 15,113 2,659,592 5,458,202 3,471 Shareholders’ equity 3,844,206 11,888 2,552,382 497,532 3,555,280 4,701 2,596,510 507,428 Total liabilities and shareholders’ equity 8,387,342 51,883 8,781,016 530,943 8,156,184 32,010 8,221,142 544,565 01/01/2018 at 12/31/2018 01/01/2017 a 12/31/2017 Joint-Venture Joint-Operation Joint-Venture Joint-Operation Equity interest (%) MRS Logística CBSI Transnordestina Logística Itá Energética MRS Logística CBSI Transnordestina Logística Itá Energética 34.94% 50.00% 46.30% 48.75% 34.94% 50.00% 46.30% 48.75% Statements of Income Net revenue 3,726,448 166,080 166,358 3,492,805 135,399 168,194 Cost of sales and services (2,476,628) (142,254) (77,829) (2,307,108) (120,647) (76,810) Gross profit 1,249,820 23,826 88,529 1,185,697 14,752 91,384 Operating (expenses) income (313,606) (10,884) (18,020) (60,104) (283,151) (8,340) (32,245) (58,465) Financial income (expenses), net (151,839) (179) (26,103) (126) (187,295) (1,004) (13,938) 317 Income before income tax and social contribution 784,375 12,763 (44,123) 28,299 715,251 5,408 (46,183) 33,236 Current and deferred income tax and social contribution (262,760) (3,761) (9,452) (254,001) (1,838) (11,105) (Loss) profit for the year, net 521,615 9,002 (44,123) 18,847 461,250 3,570 (46,183) 22,131 · ITÁ ENERGÉTICA S.A. - (“ITASA”) ITASA is a corporation established in July 1996 that was engaged to operate under a concession, the Itá Hydropower Plant (“UHE Itá”), with 1,450 MW of installed power, located on the Uruguay River, on the Santa Catarina and Rio Grande do Sul state border. The UHE Itá concession is shared with ENGIE Brasil Energia S.A., with CSN holding 48.75%. · MRS LOGÍSTICA S.A. (“MRS”) With registered offices in the City of Rio de Janeiro-RJ, this subsidiary is engaged in public railroad transportation, on the basis of an onerous concession, on the domain routes of the Southeast Grid of the federal railroad network (Rede Ferroviária Federal S.A. – RFFSA), located in the Southeast (Rio de Janeiro, São Paulo and Belo Horizonte. The concession has a 30-year term as from December 1, 1996, extendable for an equal term by exclusive decision of the concession grantor. MRS may further engage in services involving transportation modes related to railroad transportation and participate in projects aimed at expanding the railroad service concessions granted. For performance of the services covered by the concession, MRS leased from RFFSA for the same concession period, the assets required for operation and maintenance of the freight railroad transportation activities. At the end of the concession, all the leased assets are to be transferred to the ownership of the railroad transportation operator designated at that time. The Company had a direct equity interest of 18.64% in the capital stock of MRS and an indirect equity interest of 18.63% through its subsidiary CSN Mineração S.A., consequently the total participation is 34.94%. · CONSÓRCIO DA USINA HIDRELÉTRICA DE IGARAPAVA The Igarapava Hydroelectric Power Plant is located on the Grande River, in the city of Conquista, MG, and has installed capacity of 210 MW. It consists of 5 bulb-type generating units. CSN holds a 17.92% investment in the consortium, whose specific purpose is the distribution of electric power, which is made according to the percentage equity interest of each company. The balance of property, plant and equipment less depreciation as of December 31, 2018 is R$23,596 (R$24,759 as of December 31, 2017) and the expense in 2018 amounted to R$5,827 (R$5,966 in 2017). · CBSI - COMPANHIA BRASILEIRA DE SERVIÇOS DE INFRAESTRUTURA (“CBSI”) CBSI is the result of a joint venture between CSN and CKTR Brasil Ltda. Based in the city of Araucária, PR, CBSI is primarily engaged in providing services to CSN and other third-party entities, and can operate activities related to the refurbishment and maintenance of industrial machinery and equipment, construction maintenance, industrial cleaning, logistic preparation of products, among other activities. CSN holds a 50% interest. · TRANSNORDESTINA LOGÍSTICA S.A. (“TLSA”) TLSA is primarily engaged in the public service operation and development of a railroad network in the Northeast of Brazil network, comprising the rail segments Missão Velha-Salgueiro, Salgueiro-Trindade, Trindade-Eliseu Martins, Salgueiro- Porto de Suape, and Missão Velha-Porto de Pecém sections (“Railway System II”). It is in pre-operational phase and will remain so until the completion of Rail Network II. The approved schedule, which considered the completion of the work by January 2017, is currently under discussion with the responsible bodies, according described in the item 28.c. The Management of TLSA understands that new deadlines for project completion will not have material adverse effects on the expected return on investment. During the year 2017, the others shareholders of TLSA subscribed 2,912,997 shares in amounting to R$153,253, diluting CSN on TLSA share capital to 46.30%. Therefore, due to the transactions described above and the participation change of the shareholders in the share capital of TLSA on 2017, the Company recognized a gain of R$2,814, recorded in equity in other comprehensive income. The Management receives funds from its shareholders and third parties for completion of the works, according described in the item 28.c, which are expected to be available, based on agreements previously entered into and recent discussions between the involved parties. After analyzing this matter, Management concluded as adequate the use of the accounting base of the project’s going concern in the preparation of the financial statements for the year ended December 31, 2018. TLSA performed an impairment test of its own long-live assets using the discount cash flow method and considered the main assumptions, as follows: Measurement of recoverable value: Cash Flow Projection Until 2057 Gross Margin Based on market studies to capture operations costs and loads, based on studies of market trends. Estimated Costs Costs based on studies and market trends. Growth rate in perpetuity Growth rate was not considered due to the projection model until the end of the concession. Discount rate Between 5.1% to 7.9% in real terms. In addition, CSN, as an investor, performed an impairment test of its stake in TLSA, through TLSA ability to distribute dividends, methodology known as Dividend Discount Model, or DDM, to remunerate the capital invested by shareholders. In order to perform this test, some aspects were taken into account, such as: · The flow of dividends was obtained from the TLSA nominal cash flow; · The flow of dividends was calculated considering the annual percentages of participation, considering the dilutions of the CSN’s stakes due to the amortization of debts; · This flow of dividends was discounts at present value using cost of equity (Ke) embedded in the WACC rate of TLSA; and · This Ke obtained was the one calculated in the “rolling WACC” of TLSA. Due to the sharing of investors risks, and by the fact that the asset that is being tested represents the cash-generating unit itself, which is equal to the legal entity, the risk determined by CSN Management is the same applied by TLSA when the evaluation of their own investments, not applying an additional risk fator to the model. As a result, it was not necessary to recognize an impairment in the surplus-value of the investments in the year ended on December 31, 2018. 9.e) Additional information on indirect participation in abroad operations · STAHLWERK THÜRINGEN GMBH (“SWT”) SWT was formed from the former industrial steel complex of Maxhütte, located in the Germany city of Unterwellenborn, which produces steel shapes used for construction in accordance with international quality standards. Its main raw material is steel scrap; the Company has an installed production capacity of 1.1 million metric tons’ steel/year. The SWT is a wholly owned indirect subsidiary of CSN Steel S.L.U, a subsidiary of CSN. · COMPANHIA SIDERURGICA NACIONAL – LLC (“CSN LLC”) Incorporated in 2001 with the assets and liabilities from the extinct Heartland Steel Inc., CSN LLC has an industrial plant in Terre Haute, Indiana State - USA, where the cold rolled and galvanized steel production lines are located, its installed production capacity is 800 thousand tons/year. CSN LLC is a wholly owned indirect subsidiary through CSN Steel S.L.U. after Merger, previously named CSN Americas S.L.U, a subsidiary of CSN. On June 5, 2018 CSN LLC had its corporate name changed to "Heartland Steel Processing, LLC". On the same date, a new company was incorporated under the name "Companhia Siderúrgica Nacional, LLC", a wholly owned subsidiary of Heartland Steel Processing, LLC. On June 28, 2018, Companhia Siderúrgica Nacional, LLC., became a wholly-owned subsidiary of CSN Steel and, on June 29, 2018, Heartland Steel Processing, LLC was sold to Steel Dynamics, Inc for the base transaction price of R$400million. The new "Companhia Siderúrgica Nacional, LLC" imports and comercializes steel products and maintains its activities in the United States. · LUSOSIDER AÇOS PLANOS S.A. (‘Lusosider’’) Incorporated in 1996 in succession to Siderurgia Nacional (a company privatized by the Portuguese government that year), Lusosider is the only Portuguese company of the steel industry to produce cold rolled and galvanized anti-corrosion steel. Based in Paio Pires, The Lusosider has an installed capacity of about 550,000 tons / year to produce four large groups of steel products: galvanized sheet, cold rolled sheet, pickled and oiled plate. The products are manufactured by Lusosider and may be used in the packaging industry, construction (pipes and metallic structures) and in home appliance components. 9.f) Other investments · PANATLÂNTICA S. A. (“Panatlântica”) Panatlântica is a publicly-held company, headquartered in the city of Gravataí, State of Rio Grande do Sul, engaged in the manufacturing, trade, import, export and processing of steel and ferrous or non-ferrous metals, coated or not. This investment is classified as fair value through profit or loss, recognizing changes in fair value in profit or loss. The Company currently holds 11.31% (11.33% as of December 31, 2017) of Panatlântica’s total share capital. · USINAS SIDERURGICAS DE MINAS GERAIS S.A. – USIMINAS (“USIMINAS”) Usiminas, headquartered in Belo Horizonte, State of Minas Gerais, is engaged in steel and related operations. Usiminas produces flat rolled steel in the Intendente Câmara and José Bonifácio de Andrada e Silva plants, located in Ipatinga, Minas Gerais, and Cubatão, São Paulo, respectively, the final product is sold in the domestic and foreign market. Usiminas also exploits iron ore mines located in Itaúna, Minas Gerais, to meet its verticalization and production cost optimization strategies. Usiminas also has service and distribution centers located in several regions of Brazil, and the Cubatão, São Paulo, and Praia Mole in Espírito Santo, all centers are located in strategic locations for the shipment of its production. On April 9, 2014, the Administrative Council for Economic Defense (CADE - Conselho Administrativo de Defesa Econômica) issued its decision on the matter about the Usiminas shares held by CSN signing a Performance Commitment Agreement), also called TCD, between CADE and CSN. Under the terms of the decision of CADE and TCD, CSN must reduce its interest in USIMINAS, within a specified period. The deadline and percentage reduction are confidential. In addition, the political rights in Usiminas will continue suspended until the Company reaches the limits established in the TCD. In February 2018, were sold 3,136,100 of preferred shares (USIM5) in the amount of R$ 39,377, by the exclusive fund “VR1 - Multi-Credit Private Investment Fund. As of December 31, 2018 and 2017, the Company’s interest in Usiminas’s capital was 15.19% in common shares and 20.29% (20.86% as of December 31,2017) in preferred shares. USIMINAS is listed on the São Paulo Stock Exchange (“B3 S.A.- Brasil, Bolsa, Balcão”: USIM3 and USIM5). • ARVEDI METALFER DO BRASIL S.A. (“Arvedi”) Arvedi, headquartered in Salto, State of São Paulo, is engaged in pipe production. As of December 31, 2018 and 2017 CSN held 20.00% of Arvedi’s share capital.

10. PROPERTY, PLANT AND EQUIPME

10. PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
	Dec. 31, 2018
Property, plant and equipment [abstract]
PROPERTY, PLANT AND EQUIPMENT	Consolidated Land Buildings and Infrastructure Machinery, equipment and facilities Furniture and fixtures Construction Other (*) Total Balance at December 31, 2017 279,740 2,796,947 11,985,920 33,103 2,475,935 393,194 17,964,839 Cost 279,740 3,819,929 21,674,362 164,152 2,475,935 669,096 29,083,214 Accumulated depreciation (1,022,982) (9,688,442) (131,049) (275,902) (11,118,375) Balance at December 31, 2017 279,740 2,796,947 11,985,920 33,103 2,475,935 393,194 17,964,839 Translation adjustment 7,730 11,653 86,553 543 4,275 4,605 115,359 Acquisitions 622 1,259 144,499 1,574 1,158,788 21,152 1,327,894 Capitalized interest (notes 25 and 30) 71,611 71,611 Write-off and estimated losses, net of reversal (note 24) (9,768) (21,468) (6) (4,348) (2,655) (38,245) Depreciation (note 23) (134,534) (1,043,188) (5,394) (22,456) (1,205,572) Transfers to other asset categories 30,031 685,005 891 (424,443) (291,484) Write-off - sale of subsidiary LLC (238) (16,950) (145,958) (181) (6,070) (21,829) (191,226) Transfers to intangible assets 5,559 (1,752) 3,807 Others (9,651) 8,440 (392) (1,603) Balance as of December 31, 2018 287,854 2,678,638 11,687,271 30,530 3,282,436 80,135 18,046,864 Cost 287,854 3,751,429 22,426,782 165,331 3,282,436 355,768 30,269,600 Accumulated depreciation (1,072,791) (10,739,511) (134,801) (275,633) (12,222,736) Balance as of December 31, 2018 287,854 2,678,638 11,687,271 30,530 3,282,436 80,135 18,046,864 (*) Refer basically to railway assets such as courtyards, tracks and leasehold improvements, vehicles, hardware, mines, ore deposits, and spare part inventories. The breakdown of the projects comprising construction in progress is as follows: Consolidated Project description Start date Completion date 12/31/2018 12/31/2017 Logistics Current investments for maintenance of current operations. 89,595 106,956 89,595 106,956 Mining Expansion of Casa de Pedra Mine capacity production. 2007 2020 (1) 844,194 750,999 Expansion of TECAR export capacity. 2009 2022 (2) 289,298 275,811 Current investments for maintenance of current operations. 725,616 408,522 1,859,108 1,435,332 Steel Supply of 16 torpedo’s cars for operation in the steel industry 2008 2020 94,920 99,483 Current investments for maintenance of current operations. (3) 558,922 228,029 653,842 327,512 Cement Construction of cement plants. 2011 2023 (4) 585,163 554,865 Current investments for maintenance of current operations. 94,728 51,270 679,891 606,135 Construction in progress 3,282,436 2,475,935 (1) Estimated completion date of the Central Plant Step 1; (2) Estimated completion date of phase 60 Mtpa; (3) Refers substantially to the technological modernization of the UPV's continuous running machines; (4) Refers substantially to the acquisition of new Integrated Cement Plants The average estimated useful lives are as follows, in years: Consolidated 12/31/2018 12/31/2017 Buildings 38 39 Machinery, equipment and facilities 22 21 Furniture and fixtures 11 12 Others 15 17 10.a) Capitalized Interest As of December 31, 2018, the Company capitalized borrowing costs amounting to R$71,611 in consolidated (as of December 31, 2017, R$91,957 in consolidated). These costs are basically estimated for the mining projects, mainly relating to the expansion of Casa de Pedra (MG) and TECAR (RJ), see notes 25 and 30. The rates used to capitalize borrowing costs are as follows: Rates 12/31/2018 12/31/2017 Unspecified projects 6.31% 8.63%

11. INTANGIBLE ASSETS

11. INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2018
Intangible Assets
INTANGIBLE ASSETS	Consolidated Goodwill Customer relationships Software Trademarks Rights and licenses (*) Others Total Balance at December 31, 2017 3,590,931 300,875 73,185 134,137 3,172,469 449 7,272,046 Cost 3,834,234 513,068 167,162 134,137 3,185,701 449 7,834,751 Accumulated amortization (133,973) (212,193) (93,977) (13,232) (453,375) Adjustment for accumulated recoverable value (109,330) (109,330) Balance at December 31, 2017 3,590,931 300,875 73,185 134,137 3,172,469 449 7,272,046 Translation adjustment 34,107 148 15,872 58 50,185 Acquisitions and expenditures 1,216 984 2,200 Transfer of property, plant and equipment (3,807) (3,807) Amortization (note 23) (46,209) (15,770) (5,470) (67,449) Balance as of December 31, 2018 3,590,931 288,773 54,972 150,009 3,166,999 1,491 7,253,175 Cost 3,831,338 573,614 161,067 150,009 3,185,701 1,491 7,903,220 Accumulated amortization (131,077) (284,841) (106,095) (18,702) (540,715) Adjustment for accumulated recoverable value (109,330) (109,330) Balance as of December 31, 2018 3,590,931 288,773 54,972 150,009 3,166,999 1,491 7,253,175 (*) Composed mainly by mineral rights with estimated resources of 1,101 million tons (Unaudited by independent auditors). Corresponding amortization is recorded based on production volumes. The average useful lives by nature are as follows, in years: Consolidated 12/31/2018 12/31/2017 Software 7 8 Customer relationships 13 13 11.a) Impairment testing The goodwill arising from expectations for future profitability of the companies acquired and the intangible assets with indefinite useful lives (trademarks) have been allocated to the operational divisions (cash-generating units) of CSN, which represent the lowest level of assets or group of assets. According to IAS36, when a CGU has an intangible asset with indefinite useful life allocated, the Company performs an impairment test. The CGU with intangible assets in this situation are as follows: Consolidated Goodwill Trademarks Total Cash generating unity Segment 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Packaging (1) Steel 158,748 158,748 158,748 158,748 Long Stel (2) Steel 235,595 235,595 150,009 134,137 385,604 369,732 Minning (3) Mining 3,196,588 3,196,588 3,196,588 3,196,588 3,590,931 3,590,931 150,009 134,137 3,740,940 3,725,068 (1) The goodwill of the Packaging cash-generating unit is shown net of impairment loss in the amount of R$109,330, recognized in 2011. (2) The goodwill and trademark that are recorded in line item intangible assets at long steel segment, those transactions are derived from the business combination of Stahlwerk Thuringen GmbH ("SWT") and Gallardo Sections CSN. The assets mentioned are considered to have indefinite useful lives as they are expected to contribute indefinitely to the Company's cash flows. (3) Refers to the goodwill based on expectations for future profitability, resulting from the acquisition of Namisa by CSN Mineração. The impairment testing of the goodwill and the trademark include the balance of property, plant and equipment of the cash-generating units and also the intangible. The test is based on the comparison between the actual balances and the value in use of those units, determining based on the projections of discounted cash flows and use of such assumptions and judgements as: growth rate, costs and expenses, discount rate, working capital, future Capex investment and macroeconomic assumptions observable in the market. The main assumptions used in calculations of value in use at December 31, 2018 are as follows: Metal packaging Flat steel (*) Logistic (**) Mining Measurement of recoverable value Discounted Cash Flow Discounted Cash Flow Discounted Cash Flow Discounted Cash Flow Cash flow projection Until 2028 + perpetuity Until 2028 + perpetuity Until 2027 Until 2054 Gross Margin Gross margin updated based on historical data, impacts of business restructuring and market trends Gross margin updated based on historical data and market trends. Estimated based on market studies for cargo captures and operational costs according market trends. Reflects projection of costs due to the progress of the mining plan as well as startup and ramp up of projects . Price and exchange rate projected according industry reports. Cost atualization Cost based on historical data of each product and impacts of business restructuring Updated costs based on historical data and market trends Costs based on historical data and market trends Updated costs based on historical data, progress of mining plan as well as startup and ramp up of projects Growth Rate Growth of 1.5% p.a in real terms updated by long term inflation of 4.0% p.a. Growth of 1.4% p.a in real terms updated by long term inflation of 2.5% p.a. of the Euro zone Growth of 1.5% p.a in real terms Without growth in real terms updated only by long term inflation of 4.0% p.a. Discount rate For Metal packaging, flat steel and mining, these cash flows were considered using a discount rate after taxes between 5% and 13% p.a. in (*) Refer to assets of subsidiary Lusosider, located in Portugal. The discount rate was applied on the discounted cash flow prepared in Euros, the functional currency of this subsidiary. (**) Refer to assets of subsidiary FTL – Ferrovia Transnordestina Logística S.A. For the subsidiary SWT, the measurement of recoverable value was based on fair value and classified as Level 3, based on unobservable inputs that reflect the assumptions that market participants would use for pricing, including risk assumptions and discount rate. Based on the analyses conducted by Management, it was not necessary to record losses by impairment to those assets for the year ended on December 31, 2018.

12. BORROWINGS, FINANCING AND D

12. BORROWINGS, FINANCING AND DEBENTURES	12 Months Ended
	Dec. 31, 2018
Borrowings Financing And Debentures
BORROWINGS, FINANCING AND DEBENTURES	The balances of borrowings, financing and debentures, which are carried at amortized cost, are as follows: Consolidated Current liabilities Non-current liabilities 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Debt agreements in the international market Variable interest in: US$ Prepayment (1) 1,016,737 791,163 3,830,240 4,097,509 Fixed interest in: US$ Bonds, Perpetual Bonds and ACC (2) 2,490,178 523,509 8,613,491 8,920,342 Intercompany EUR Others 181,056 251,630 106,535 197,131 3,687,971 1,566,302 12,550,266 13,214,982 Debt agreements in Brazil Securities with variable interest in: R$ BNDES/FINAME, Debentures , NCE CCB (3) 1,890,450 4,982,159 10,710,678 9,702,972 Securities with fixed interest in: R$ Prepayment 103,376 3,303 100,000 1,993,826 4,985,462 10,710,678 9,802,972 Total Borrowings and Financing 5,681,797 6,551,764 23,260,944 23,017,954 Transaction Costs and Issue Premiums (28,358) (24,862) (87,309) (34,012) Total Borrowings and Financing + Transaction Costs 5,653,439 6,526,902 23,173,635 22,983,942 (2) In February 2018, the Company issued debt securities in the foreign market ("Notes"), through its subsidiary CSN Resources SA, in the amount of US$ 350 million, maturing in 2023 and interest of 7.625% per annum. In parallel, a tender offer ("Tender Offer") of the Notes was issued by CSN Islands XI Corp. and CSN Resources S.A., subsidiaries of the Company, having repurchased US$ 350 million with expected maturity for 2019 and 2020. The Notes are unconditionally and irrevocably guaranteed by the Company. (3) In February 2018, the Company concluded the renegotiation of its debt of R$4.9 billion with Banco do Brasil SA ("BB"), related to its own issues of Export Credit Notes plus the issues made by its subsidiary CSN Mineração, moving the maturities from 2018 to 2022 to maturity until December 2024, with a guarantee of part of the shares of Usiminas, owned by the Company. In August 2018, the Company concluded the negotiations to reprofile its debts of R$ 6.8 billion with Caixa Econômica Federal, referring to the Bank Credit Note, rescheduling the maturities throughout 2018 to 2023 to maturity up to 2024, with guarantee of shares of Usiminas shares owned by the Company. The following table shows the average interest rate: Consolidated 12/31/2018 Average interest rate (*) Total debt US$ 5.88% 15,950,646 R$ 8.19% 12,704,504 EUR 3.88% 287,591 28,942,741 (*) In order to determine the average interest rates for debt contracts with floating rates, the Company used the rates applied as of December 31, 2018. 12.a) Maturities of borrowings, financing and debentures presented in non-current liabilities As of December 31, 2018, the breakdown of principal plus interest of long-term liabilities as borrowings, financing and debentures by maturity date is presented as follows: Consolidated 12/31/2018 Principal Bank loans Capital markets Development agencies Total 2020 3,187,269 3,499,177 66,892 6,753,338 2021 3,263,810 116,003 59,455 3,439,268 2022 3,087,732 36,667 58,154 3,182,553 2023 2,669,211 1,356,180 56,985 4,082,376 2024 1,276,001 67,734 1,343,735 After 2024 584,874 584,874 Perpetual bonds 3,874,800 3,874,800 13,484,023 8,882,827 894,094 23,260,944 12.b) Amortization and borrowings raised, financing and debentures The table below presents the funding raised and amortizations during the year: Consolidated 12/31/2018 12/31/2017 Opening balance 29,510,844 30,441,018 Funding raised 2,154,471 538,771 Principal repayments (5,019,978) (1,528,023) Payments of charges (2,141,710) (2,634,931) Provision of charges 2,009,688 2,438,555 Write-off – sale of subsidiary LLC (10,544) Others (1) 2,324,303 255,454 Closing balance 28,827,074 29,510,844 (1) Includes unrealized monetary and foreign exchange variations. In 2018, the Group obtained and amortized loans as shown below: · Funding raised and amortizations: Consolidated 12/31/2018 Nature Raised Amortization of principal Amortization of charges Prepayment 849,654 280,923 Bonds, Perpetual bonds and ACC 1,749,099 1,632,464 675,370 BNDES/FINAME, Debentures, NCE and CCB 10,792 1,948,014 1,173,380 Others 394,580 589,846 12,037 2,154,471 5,019,978 2,141,710 · Covenants The Company's loan agreements establish the fulfillment of certain non-financial obligations, as well as maintenance of certain parameters and performance indicators, such as disclosure of its audited financial statements according to regulatory deadlines or payment of commission on risk assumption, if the net debt-EBITDA ratio reaches the levels in those agreements, under penalty of anticipated maturity. The Company is in compliance with the financial and non-financial obligations (covenants) of its current contracts, not considered any non-compliances already remedied or that have not generated the acceleration of debts or any type of accounting provision. On December 31, 2018, the Company has provisioned R$ 38,134 in the Consolidated (R$ 30,843 as of December 31, 2017) for risk assumption. 12.c) GUARANTEES The Company is liable for guarantees of its subsidiaries and joint ventures as follows: Currency Maturities Borrowings Tax foreclosure Others Total 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Transnordestina Logísitca R$ Until 09/19/2056 and Indefinite 2,108,917 2,541,347 35,336 22,214 8,231 3,866 2,152,484 2,567,427 FTL - Ferrovia Transnordestina R$ 11/15/2020 62,407 69,405 62,407 69,405 Sepetiba Tecon 36,308 36,308 Cia Metalurgica Prada R$ Indefinite 333 333 11,942 18,540 12,275 18,873 CSN Energia R$ Until 11/26/2023 and Indefinite 2,829 2,829 1,920 4,749 2,829 CSN Mineração R$ Until 12/26/2024 1,407,363 2,000,000 1,407,363 2,000,000 Estanho de Rondônia R$ 07/15/2022 3,153 3,153 3,153 3,153 Minérios Nacional S.A. R$ Until 09/10/2021 7,305 7,305 - Total in R$ 3,589,145 4,613,905 38,498 25,376 22,093 58,714 3,649,736 4,697,995 CSN Islands XI US$ 09/21/2019 547,094 750,000 547,094 750,000 CSN Islands XII US$ Perpetual 1,000,000 1,000,000 1,000,000 1,000,000 CSN Resources US$ Until 02/13/2023 1,402,906 1,200,000 1,402,906 1,200,000 Total in US$ 2,950,000 2,950,000 2,950,000 2,950,000 CSN Steel S.L. EUR 1/31/2020 48,000 120,000 48,000 120,000 Lusosider Aços Planos EUR Indefinite 75,000 25,000 75,000 25,000 Total in EUR 123,000 145,000 123,000 145,000 Total in R$ 11,976,657 10,334,149 11,976,657 10,334,149 15,565,802 14,948,054 38,498 25,376 22,093 58,714 15,626,393 15,032,144

13. FINANCIAL INSTRUMENTS

13. FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2018
Financial Instruments
FINANCIAL INSTRUMENTS	I - Identification and measurement of financial instruments The Company enters into transactions involving various financial instruments, mainly cash and cash equivalents, including short-term investments, marketable securities, trade receivables, trade payables, and borrowings and financing. The Company also enters into derivative transactions, especially interest rate and foreign exchange rate swaps. Considering the nature of these instruments, their fair value is basically determined by using Brazil’s money market and mercantile and futures exchange quotations. The amounts recognized in current assets and current liabilities have immediate liquidity or short-term maturity, mostly less than three months. Considering the maturities and characteristics of such instruments, their carrying amounts approximate their fair values. · Classification of financial instruments With the implementation of pronouncements IFRS 9, the classification of financial instruments: held to maturity, loans and receivables and available for sale were replaced by three categories of classification and measurement of financial instruments: amortized cost, fair value through other comprehensive income (VJORA) and fair value through profit or loss (VJR). Consolidated Disclosed on 12/31/2017 Applied on 01/01/2018 Balance at 12/31/2017 Assets Current Cash and cash equivalents Loans and Receivables Amortized cost 3,411,572 Short term investments Loans and Receivables Amortized cost 735,712 Accounts Receivable Net Loans and Receivables Amortized cost 2,197,078 Loans with related parties Loans and Receivables Amortized cost 2,441 Derivative financial instruments VJR VJR Trading securities VJR VJR 2,952 Dividends receivable Amortized cost Amortized cost 41,528 Non-current Loans with related parties Loans and Receivables Amortized cost 554,694 Other trade receivables Loans and Receivables Amortized cost 20,024 Investments Available for sale VJR 2,222,479 Liabilities Current Borrowings and financing Amortized cost Amortized cost 6,551,764 Derivative financial instruments VJR VJR Trade payables Amortized cost Amortized cost 2,460,774 Dividends and interest on capital Amortized cost Amortized cost 510,692 Non-current Borrowings and financing Amortized cost Amortized cost 23,017,953 Consolidated 12/31/2018 12/31/2017 Notes Fair value through profit or loss Measured at amortized cost Balances Fair value through profit or loss Measured at amortized cost Balances Assets Current Cash and cash equivalents 4 2,248,004 2,248,004 3,411,572 3,411,572 Financial investments 5 895,713 895,713 735,712 735,712 Trade receivables 6 2,078,182 2,078,182 2,197,078 2,197,078 Dividends receivable 8 46,171 46,171 41,528 41,528 Derivative financial instruments 8 351 351 Trading securities 8 4,503 4,503 2,952 2,952 Loans - related parties 8 2,675 2,675 2,441 2,441 Total 4,854 5,270,745 5,275,599 2,952 6,388,331 6,391,283 Non-current Financial investments 5 7,772 7,772 Other trade receivables 8 820,879 820,879 804,765 804,765 Investments 9 2,279,189 2,279,189 2,222,433 2,222,433 Loans - related parties 8 706,605 706,605 554,694 554,694 Total 2,279,189 1,535,256 3,814,445 2,222,433 1,359,459 3,581,892 Total Assets 2,284,043 6,806,001 9,090,044 2,225,385 7,747,790 9,973,175 Liabilities Current Borrowings and financing 12 5,681,797 5,681,797 6,551,764 6,551,764 Trade payables 3,473,822 3,473,822 2,505,695 2,505,695 Dividends and interest on capital 14 932,005 932,005 510,692 510,692 Total 10,087,624 10,087,624 9,568,151 9,568,151 Non-current Borrowings and financing 12 23,260,945 23,260,945 23,017,953 23,017,953 Total 23,260,945 23,260,945 23,017,953 23,017,953 Total Liabilities 33,348,569 33,348,569 32,586,104 32,586,104 · Fair value measurement The following table shows the financial instruments recognized at fair value through profit or loss using a valuation method: Consolidated 12/31/2018 12/31/2017 Level 1 Level 2 Balance Level 1 Balance Assets Current Financial assets at fair value through profit or loss Derivative financial instruments 351 351 Trading securities 4,503 4,503 2,952 2,952 Non-current Available-for-sale financial assets Investments 2,279,189 2,279,189 2,222,433 2,222,433 Total Assets 2,283,692 351 2,284,043 2,225,385 2,225,385 Level 1 - quoted prices in active markets for identical assets or liabilities. Level 2 - Includes observable inputs in market such as interest rates, exchange etc., but not prices traded in active markets. There are no assets and liabilities classified as level 3. II – Investments in financial instruments measured at fair value through profit or loss. During the application of IAS 39 until December 2017, the Company has investments in equity instruments, measured at fair value through other comprehensive income, because the nature of the investment is not included in any other categories of financial instruments (loans and receivables, held-to-maturity investments or financial assets at fair value through profit or loss). Gains and losses arising from the variation of the share price were recorded directly in shareholders' equity under the account "Other comprehensive income" and for each significant decrease in market value an impairment loss was recognized in the statement of income. With the implementation of the pronouncement IFRS 9 as from January 1, 2018, the equity instruments classified as held-to-maturity should be classified as fair value through profit or loss (VJR). In this way, the Company reclassified the investments in common (USIM3) and preferred (USIM5) shares of Usiminas (“Usiminas Shares”), from fair value through other comprehensive income (VJORA) to fair value through profit or loss. In relation to Panatlântica shares (PATI3), currently classified as (VJORA), the Company based on its current business model, whose objective is to maintain this financial asset to obtain contractual cash flows, but adopts the option to reclassify it to VJR, recognizing changes in fair value in profit or loss. Accordingly, the credit balance accumulated in December 2017 in other comprehensive income of R$1,559,682 was reclassified to the statement of income from the effective date of the new standard. With the new classification, changes in fair value are recorded in the statement of income, whose movement occurred until December 31, 2018 generated a gain of R$ 96,133 and a cumulated gain of R$ 1,655,813 (See opening below and note 24). Class of shares 12/31/2018 Sale of shares 12/31/2017 12/31/2018 Quantity Share price Closing Balance Quantity Share price Cash Received Quantity Share price Closing Balance Fair Value Adjustment Recognized in profit or loss Reclassification of Comprehensive Income for the year (note 31) USIM3 107,156,651 11.44 1,225,872 107,156,651 10.83 1,160,506 65,366 694,685 USIM5 111,144,456 9.22 1,024,752 3,136,100 12.56 39,377 114,280,556 9.10 1,039,953 24,176 865,264 PATI3 1,997,642 14.30 28,565 1,997,642 11.00 21,974 6,591 (269) 220,298,749 2,279,189 3,136,100 39,377 223,434,849 2,222,433 96,133 1,559,680 1,655,813 As of December 31, 2018 and 2017, the Company’s interest in Usiminas’s capital was 15.19% in common shares and 20.29% (20.86% as of December 31, 2017) in preferred shares. In February 2018, 3,136,100 preferred shares (USIM5) were sold, totaling R$39,377 through the exclusive fund "VR1 - Multimarket Private Investment Fund". · Share market price risks The Company is exposed to the risk of changes in the price of the shares due to the investments, valued at fair value through profit or loss and other comprehensive income that have their prices based on the market price on the stock exchange (B3). III - Financial risk management The Company follows strategies of managing its risks, with guidelines regarding the risks incurred by the company. The nature and general position of financial risks are regularly monitored and managed in order to assess the results and the financial impact on cash flow. The quality of counterparties’ hedging instruments and the credit limit are also periodically reviewed. The market risks are hedged when it is considered necessary to support the corporate strategy or when it is necessary to maintain a level of financial flexibility. Under the terms of the risk management policy, the Company can manage some risks by using derivative instruments not associate to any speculative deals or short sales. 13.a) Foreign exchange and interest rate risks · Exchange rate risk The exchange rate risk arises from the existence of assets and liabilities denominated in US dollars or Euros since the Company's functional currency is substantially the R eal that The consolidated net exposure as of December 31, 2018 is as follows: 12/31/2018 Foreign Exchange Exposure (Amounts in US$’000) (Amounts in €’000) Cash and cash equivalents overseas 376,581 3,387 Trade receivables 358,283 1,124 Other assets 8,623 4,594 Total Assets 743,487 9,105 Borrowings and financing (4,116,508) (48,791) Trade payables (175,404) (7,946) Other liabilities (3,529) (920) Total Liabilities (4,295,441) (57,657) Foreign exchange exposure (3,551,954) (48,552) Cash flow hedge accounting 2,076,045 Net Investment hedge accounting 48,000 Net foreign exchange exposure (1,475,909) (552) Perpetual bonds 1,000,000 Net foreign exchange exposure excluding perpetual bonds (475,909) (552) CSN uses as strategy the hedge accounting, as well as derivative instruments with the purpose of hedging CSN's future cash flows. · Interest rate risk Risk arises from short and long term liabilities with fixed or post fixed interest rates and inflation rates. Item 13.b) shows the derivatives and hedging strategies to protect exchange and interest rates risks. 13.b) Hedging instruments: Derivative and cash flows hedge accounting and foreign investment hedge accounting CSN uses instruments for protection of foreign currency risk and interest rate risk, as shown in the following topics: · Portfolio of derivative financial instruments Dollar x Euro swap The subsidiary Lusosider has derivative transactions to protect its dollar exposure versus euro. Consolidated 12/31/2018 Appreciation (R$) Fair value (market) Impact on financial income (expenses) in 2018 Counterparties Maturity Functional Currency Notional amount Asset position Liability position Amounts receivable / (payable) BCP 03/08/2019 Dollar 18,563 71,967 (71,616) 351 (1) Total dollar-to-euro swap 18,563 71,967 (71,616) 351 (1) 71,967 (71,616) 351 (1) · Classification of the derivatives in the balance sheet and statement of income 12/31/2018 12/31/2017 Instruments Assets Financial income (expenses) (Note 25) Current Total Dollar - to - euro swap 351 351 (1) (229) Future DI - 28,503 351 351 (1) 28,274 · Cash flow hedge accounting Beginning November 1, 2014, the Company formally designated cash flow hedging relationships to protect highly probable future cash flows against US dollar fluctuations. In order to better reflect the accounting impacts of this foreign exchange hedging strategy on its profit, CSN designated part of its US dollar-denominated liabilities as a hedging instrument of its future exports. As a result, foreign exchange differences arising on translating the designated liabilities will be temporarily recognized in shareholders’ equity and allocated to profit or loss when such exports are carried out, which will allow recognizing the US dollar impact on liabilities and exports concurrently. Note that adopting hedge accounting does not entail contracting any financial instrument. As of December 31, 2018 the Company designated for hedge accounting US$2,076,045 in exports to be carried out between January, 2019 to February, 2023. To support these designated amounts, the Company prepared formal documentation indicating how hedging is aligned with the goal and strategy of CSN’s Risk Management by identifying the hedging instruments used, the hedging purpose, the nature of the hedged risk, and showing the expected high effectiveness of the designated relationships. The designated debt instruments total an amount equivalent to the portion of future exports. Thus, the exchange differences on translating the instrument and the hedged item are similar. According to the Company’s accounting policy, continuous assessments of the prospective and retrospective effectiveness must be carried out by comparing the designated amounts with the expected amounts, approved in Management’s budgets, and the actual export amounts. Through hedge accounting, the exchange gains and losses of the debt instruments do not immediately affect the Company’s profit or loss except to the extent that exports are carried out. The table below shows a summary of the hedging relationships as of December 31, 2018: 12/31/2018 Designation Date Hedging Instrument Hedged item Type of hedged risk Hedged period Exchange rate on designation Designated amounts (US$’000) Amortizated part (USD'000) Effect on Result (*) (R$'000) Impact on Shareholders' equity (R$'000) 11/03/2014 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2016 - September 2019 2.4442 500,000 (250,003) 171,983 (357,649) 12/01/2014 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2015 - February 2019 2.5601 175,000 (154,999) 36,766 (26,295) 12/18/2014 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate May 2020 2.6781 100,000 (119,670) 07/21/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate July 2019 - March 2021 3.1813 60,000 (41,610) 07/23/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate July 2019 - March 2021 3.2850 100,000 (58,980) 07/23/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.285 30,000 (6,000) 5,102 (14,155) 07/24/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.3254 100,000 (20,000) 16,198 (43,952) 07/27/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.3557 25,000 (5,000) 3,898 (10,382) 07/27/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.3557 70,000 (14,000) 10,914 (29,070) 07/27/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.3557 30,000 (6,000) 4,677 (12,458) 07/28/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.3815 30,000 (6,000) 4,523 (11,839) 3/8/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - October 2022 3.3940 355,000 (11,998) 6,179 (164,915) 04/02/2018 Bonds Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate July 2018 - February 2023 3.3104 1,170,045 (195,000) 109,951 (550,320) Total 2,745,045 (669,000) 370,191 (1,441,295) (*) The effect on the result was recorded in other operating expenses. In the hedging relationships described above, the amounts of the debt instruments were fully designated for equivalent iron ore export portions. The movements in the hedge accounting amounts recognized in shareholders’ equity as of December 31, 2018 are as follows: 12/31/2017 Movement Realization 12/31/2018 Cash flow hedge accounting 395,524 1,415,962 (370,191) 1,441,295 Fair value of cash flow hedge, net of taxes 395,524 1,415,962 (370,191) 1,441,295 As of December 31, 2018, the hedging relationships established by the Company were effective, according to the prospective tests conducted. Thus, no reversal for hedge accounting ineffectiveness was recognized. · Net investment hedge in foreign subsidiaries CSN has a natural foreign exchange exposure in Euros substantially arising from a loan made by a foreign subsidiary with functional currency in Reais, for the acquisition of investments abroad whose functional currency is Euro. Such exposure arises from converting the balance sheets of these subsidiaries for consolidation in CSN, and the exchange rate of the loans affected the income statement in the financial result item and the exchange variation of the net assets of the foreign operation directly affected the equity in other comprehensive income. As from September 1 st 12/31/2018 Designation Date Hedging Instrument Hedged item Type of hedged risk Exchange rate on designation Designated amounts (EUR'000) Amortized part (USD’000) Impact on shareholders' equity 09/01/2015 Non-derivative financial liabilities in EUR – Debt contract Investments in subsidiaries which EUR is the functional currency Foreign exchange - R$ vs. EUR spot rate 4.0825 120,000 (72,000) 3,941 Total 120,000 (72,000) 3,941 The changes in the amounts related to net investment hedge recognized in shareholders’ equity as of December 31, 2018 are presented below: 12/31/2017 Movement 12/31/2018 Net Investment hedge accounting (17,911) 21,852 3,941 Fair value of net investment hedge in foreign operations (17,911) 21,852 3,941 On December 31, 2018 hedge relationships established by the Company found to be effective, according to prospective tests. Therefore, no reversal by ineffectiveness of the hedge was recorded. 13.c) Sensitivity analysis We present below the sensitivity analysis for currency risk and interest rate. · Sensitivity analysis of Derivative Financial Instruments and consolidated Foreign Exchange Exposure The Company considered scenarios 1 and 2 as 25% and 50% of deterioration for volatility of the currency, using as reference the closing exchange rate as of December 31, 2018. The currencies used in the sensitivity analysis and its scenarios are shown below: 12/31/2018 Currency Exchange rate Probable scenario Scenario 1 Scenario 2 USD 3,8748 3,7626 4,8435 5,8122 EUR 4,4390 4,2833 5,5488 6,6585 USD x EUR 1,1456 1,1346 1,4320 1,7184 12/31/2018 Interest Interest rate Scenario 1 Scenario 2 CDI 6,40% 8,00% 9,60% TJLP 6,98% 8,73% 10,47% Libor 2,88% 3,60% 4,32% The effects on income statement, considering scenarios 1 and 2 are shown below: 12/31/2018 Instruments Notional Risk Probable scenario (*) Scenario 1 Scenario 2 Hedge accounting of exports 2,076,045 Dollar (232,932) 2,011,065 4,022,130 Natural currency position (3,551,954) Dollar 398,529 (3,440,778) (6,881,556) (not including exchange derivatives above) Consolidated exchange position (1,475,909) Dollar 165,597 (1,429,713) (2,859,426) (including exchange derivatives above) Net Investment hedge accounting 48,000 Euro (7,474) 53,268 106,536 Natural currency position (48,552) Euro 7,560 (53,881) (107,762) Consolidated exchange position (552) Euro 86 (613) (1,226) (including exchange derivatives above) Dollar-to-euro swap 18,563 Dollar (1,011) 14,072 23,663 (*) The probable sceneries were calculated considering the following variations to the specified risks: Real x Dollar – appreciation of Real in 2.89% / Real x Euro – appreciation of Real in 3.51%. Euro x Dollar – appreciation of Euro in 0.96%. Source: Quotation from Central Bank of Brazil and Central Bank of Europe on 01/25/2019. · Sensitivity analysis of changes in interest rates The Company considered the scenarios 1, and 2 as 25% and 50% of evolution for volatility of the interest as of December 31, 2018. Consolidated Impact on profit or loss Changes in interest rates % p.a Assets Liabilities Probable scenario (*) Scenario 1 Scenario 2 TJLP 6,98 (954,635) (2,793) (16,658) (33,316) Libor 2.88 (4,799,586) (47,391) (34,505) (69,010) CDI 6.40 609,480 (11,667,006) (53,528) (176,924) (353,848) (*) The sensitivity analysis is based on the assumption of maintaining as probable scenario the market rates at December 31, 2018 recorded in the Company´s assets and liabilities. 13.d) Liquidity risk It is the risk that the Company may not have sufficient net funds to honor its financial commitments as a result of mismatching of terms or volumes between scheduled receipts and payments. To manage cash liquidity in domestic and foreign currency, assumptions of future disbursements and receipts are established and daily monitored by the treasury area. The payment schedules for the long-term portions of borrowings, financing and debentures are shown in note 12. The following table shows the contractual maturities of financial liabilities, including accrued interest. Consolidated At December 31, 2018 Less than one year From one to two years From two to five years Over five years Total Borrowings, financing and debentures 5,681,797 10,192,606 8,608,664 4,459,675 28,942,742 Trade payables 3,473,822 3,473,822 Dividends and interest on capital 932,005 932,005 IV - Fair values of assets and liabilities as compared to their carrying amounts Financial assets and liabilities at fair value through profit or loss are recognized in current and non-current assets and liabilities, and any gains and losses are recognized as financial income or financial expenses, respectively. The amounts are recognized in the financial statements at their carrying amounts, which are substantially similar to those that would be obtained if they were traded in the market. The fair values of other long-term assets and liabilities do not differ significantly from their carrying amounts, except the amounts below. The estimated fair values for certain consolidated long-term borrowings and financing were calculated at prevailing market rates, taking into consideration the nature, terms and risks similar to those of the recorded contracts, as below: 12/31/2018 12/31/2017 Carrying amount Fair value Carrying amount Fair value Perpetual bonds 3,880,074 2,850,615 3,312,503 2,602,090 Fixed Rate Notes 6,745,132 7,595,765 5,751,526 6,207,946 (*) Source: Bloomberg · Credit risks The exposure to credit risks of financial institutions complies with the parameters established by financial policy. The Company has as practice the detailed analysis of the patrimonial and financial situation of its clients, suppliers, the establishment of a credit limit and permanent monitoring of its debit balance. With regard to financial investments, the Company only made investments in institutions with low credit risk rated by rating agencies. Since part of the funds is invested in repurchase agreements that are backed by Brazilian Government Bonds, there is also exposure to the credit risk of the brazilian State. Regarding the exposure to credit risk in accounts receivable and other receivables, the company has a credit risk committee, in which each new customer is analyzed individually regarding their financial condition, prior to the granting of the credit limit and payment terms and periodically revised, according to the periodicity procedures of each business area. · Capital Management The Company seeks to optimize its capital structure in order to reduce its financial expenses and maximize the return to its shareholders. The table below shows the evolution of the capital structure of the Company with financing by equity and third-party capital. Thousands of reais 12/31/2018 12/31/2017 Shareholder's equity (equity) 10,013,440 8,288,229 Borrowings and Financing (Third-party capital) 28,827,074 29,510,844 Gross Debit/Shareholder's equity 2.88 3.56

14. OTHER PAYABLES

14. OTHER PAYABLES	12 Months Ended
	Dec. 31, 2018
Other Payables
OTHER PAYABLES	The group of other payables classified in current and non-current liabilities is comprised as follows: Consolidated Current Non-current 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Payables to related parties (note 19 b) 35,499 3,097 96,629 Dividends and interest on capital payable (Note 13 I) 932,005 510,692 Advances from customers 137,418 68,521 Taxes in installments 20,179 21,551 73,934 79,242 Profit sharing - employees 113,219 42,699 Taxes payable 8,631 8,410 Provision from consumption and services 392,612 336,886 Third party materials in our possession 45,915 231 Other payables 28,010 31,303 48,134 41,671 1,704,857 1,014,980 227,328 129,323 In 2018, the Company reclassified the amount of R$ (44,921) in the Consolidated, which were classified as suppliers.

15. INCOME TAX AND SOCIAL CONTR

15. INCOME TAX AND SOCIAL CONTRIBUTION	12 Months Ended
	Dec. 31, 2018
Income Tax And Social Contribution
INCOME TAX AND SOCIAL CONTRIBUTION	15.a) Income tax and social contribution recognized in profit or loss: The income tax and social contribution recognized in profit or loss for the year are as follows: Consolidated 12/31/2018 12/31/2017 12/31/2016 Income tax and social contribution income (expense) Current (827,229) (358,981) (206,178) Deferred 576,895 (50,128) (60,368) (250,334) (409,109) (266,546) The reconciliation of consolidated income tax and social contribution expenses and income and the result from applying the effective rate to profit before income tax and social contribution are as follows: Consolidated 12/31/2018 12/31/2017 12/31/2016 Profit/(Loss) before income tax and social contribution 5,450,917 520,338 (576,951) Tax rate 34% 34% 34% Income tax and social contribution at combined statutory rate (1,853,312) (176,915) 196,163 Adjustment to reflect the effective rate: Equity in results of affiliated companies 50,134 42,431 22,072 Profit with differentiated rates or untaxed (46,006) 37,605 (287,502) Transfer pricing adjustment (74,836) (34,746) (63,638) Tax loss carryforwards without recognizing deferred taxes (27,683) (368,612) (821,920) Indebtdness limit (38,486) (39,378) (35,391) Unrecorded deferred taxes on temporary differences (11,964) 541,655 643,990 Deferred Income Tax and social contribution on temporary differences 971,972 (Losses)/Reversal for deferred income and social contribution tax credits 835,937 (403,080) 44,691 Income taxes and social contribution on foreign profit (30,219) (29,964) (35,613) Amortization – Goodwill Metalic 31,439 Tax incentives 36,710 14,358 22,673 Deferred taxes on exchange variation in equity (43,667) Other permanent deductions (additions) (18,914) 7,537 16,490 Income tax and social contribution in profit for the period (250,334) (409,109) (266,546) Effective tax rate 5% 79% -46% 15.b) Deferred income tax and social contribution: Deferred income tax and social contribution are calculated on income tax and social contribution losses and the corresponding temporary differences between the tax bases of assets and liabilities and their carrying amounts in the financial statements: Consolidated 12/31/2016 Movement 12/31/2017 Movement 12/31/2018 Shareholders' P&L Others Shareholders' P&L Others Deferred Income tax losses 970,800 245,846 (79,412) 1,137,234 (177,378) (616) 959,240 Social contribution tax losses 340,629 94,843 (28,588) 406,884 (39,303) (223) 367,358 Temporary differences (2,288,175) 26,778 (390,817) (2,344) (2,654,558) 21,208 793,576 839 (1,838,935) - Provision for tax. social security, labor, civil and environmental risks 256,936 12,963 269,899 (5,846) 3,184 267,237 - Provision for environmental liabilities 95,048 (8,197) 86,851 (19,708) 67,143 - Asset impairment losses 93,908 (5,475) 88,433 (7,092) 81,341 - Inventory impairment losses 35,703 10,111 45,814 (7,054) 38,760 - (Gains)/losses on financial instruments (2,300) 1,388 (912) (2,407) (3,319) - (Gains)/losses on available-for-sale financial assets 705,929 316,563 417,659 530,292 (584,856) 363,095 - Actuarial liability (pension and healthcare plan) 134,578 180,834 (41,065) (1,289) 273,058 (48) 3,022 276,032 - Accrued supplies and services 123,101 (55,385) 67,716 27,928 95,644 - Allowance for doubtful debts 42,008 5,208 47,216 14,199 61,415 - Goodwill on merger 815 (207) 608 (608) - Unrealized ex change differences (1) 1,589,651 56,493 (134,992) 1,511,152 (500,620) 1,010,532 - (Gain) on loss of control over Transnordestina (92,180) (92,180) (92,180) - Cash flow hedge accounting 148,471 (13,992) 134,479 355,563 490,042 - Aquisition Fair Value SWT/CBL (199,001) (21,143) 26,833 (193,311) (16,683) 37,880 (172,114) - Deferred taxes non computed (1,324,437) (566,173) (3,255) (115) (212,236) (38,359) (2,345) (252,940) - (Losses) estimated/ reversals to deferred taxes credits (3,013,730) 82,769 (123,056) (4,130,928) (885,069) 1,929,424 (3,086,573) - Business Combination (1,072,824) 32,288 (1,040,536) 9,724 (1,030,812) - Other 190,149 (8,573) (107,976) (940) 72,660 37,153 (62,051) 47,762 Total (976,746) 26,778 (50,128) (110,344) (1,110,440) 21,208 576,895 (512,337) Total Deferred Assets 70,151 63,119 89,394 Total Deferred Liabilities (1,046,897) (1,173,559) (601,731) Total Deferred (976,746) (1,110,440) (512,337) (1) The Company taxes exchange differences on a cash basis to calculate income tax and social contribution on net income. The Company has foreign subsidiaries in its corporate structure, for which profits are taxed at income tax in the countries where they are domiciled by lower rates than those prevailing in Brazil. From 2013 up to 2018 such foreign subsidiaries generated profits amounting to R$ 1,150,443. If for some reason tax authorities understand that these profits are subject to additional taxation in Brazil in respect of income tax and social contribution, which if due, would total R$ 366,847. The Company, based on its legal counsel’s opinion, assessed the likelihood of loss in a potential claiming by tax authorities which resulted in a possible risk of loss and, therefore, no provision was recognized in the financial statements. 15.c) Income tax and social contribution Impairment test – deferred tax assets The Company's management constantly evaluates the ability to use its tax credits. In this direction, CSN periodically updates a technical study to demonstrate if the generation of future taxable profits support the realization of tax credits and, consequently support the accounting recognition of tax credits, the maintenance on the balance sheet or the constitution of a provision for loss in the realization of these credits. This study is prepared at Entity level, in accordance with the Brazilian tax legislation, and is performed considering the Company’s projections, which is the entity that generates a significant amount of tax credits, mainly, temporary differences. The Company covers the following businesses: • Steel Brazil (Steel); and • Cement; The deferred tax assets on tax losses and temporary differences refers mainly to the following: Nature Description Tax losses In recent periods, the Company started to incur tax losses, mostly because of high financial expenses, since it holds substantially all loans and financings of CSN group and presented a taxable income in 2018. Temporary differences Foreign exchange differences Since 2012 the Company opted for the taxation of exchange differences on a cash basis. As the Company has operated without taxable profit it would not make sense to use this deductibility year by year (accrual basis). As a result of the cash basis tax treatment, taxes are only due, and expenses are only deductible at the time of debt settlement. Losses on Usiminas shares The losses on Usiminas shares are recognized on an accrual basis, but the taxable event will occur only at the time of divestment. Other provisions Various accounting provisions are recognized on an accrual basis, but their taxation occurs only at the time of its realization, such as provisions for contingencies, impairment losses, environmental liabilities, etc. The study prepared is based on the Company business plan of on a long-term basis, reasonably estimated by management and considered several scenarios which vary according to different macroeconomic and operating assumptions. The model for projection of taxable profit considers two main indicators: · Pre-Tax Profit, reflecting our projected EBITDA plus depreciation, other income and expenses and financial income (expenses); and · Taxable Profit, which is our pre-tax profit plus (minus) expenses and income items that are taxable at a time different from the time obtained on an accrual basis (temporary differences). In addition, a sensitivity analysis of tax credits utilization considering a variation in macroeconomic assumptions, operational performance and liquidity events took place. A significant aspect to be considered in the analysis is the fact that CSN has presented recent tax losses mainly due to the deterioration of the Brazilian political and macroeconomic environment, as well as the growth of its financial leverage. These two aspects combined led to an unbalance between the financial and operating results of the Company. Within this context, the Company works with a business plan to rebalance between the financial and operating results of the Company, whose main measures are: · Expansion of disinvestment efforts; · Reduction of financial leverage; · Improvement in operating results due to increased sales volume, better prices of its products and efficiency in controlling production costs and · Reprofiling of the Company's indebtedness, with negotiations to extend the amortization periods and decentralization of debt through redirection of contracts to subsidiaries according to the nature and application of resources. With the aforementioned measures already in execution, the Company's management expects to retake high profitability rates. Accordingly, management considers that the gradual recognition of tax credits, using at first a time period of projections of less than 10 years, better reflects the expectation of utilization of the credits recognized in the Company's tax books. As a result of the study, the Company reversed R$ 971,972 of the loss recorded in previous years, presenting until 2018 credits recognized in the amount of R$ 250,334 in the Consolidated. 15.d) Income tax and social contribution recognized in shareholders' equity: The income tax and social contribution recognized directly in shareholders' equity are as follows: Consolidated 12/31/2018 12/31/2017 Income tax and social contribution Actuarial gains on defined benefit pension plan 176,700 176,658 Estimated losses for deferred income tax and social contribution credits - actuarial gains (180,048) (180,834) Changes in the fair value of assets measured at fair value through other comprehensive income (530,292) Estimated losses for deferred income tax and social contribution assets - assets measured at fair value through other comprehensive income 530,292 Exchange differences on foreign operations (325,350) (369,017) Cash flow hedge accounting 490,041 134,478 Estimated losses for deferred income tax and social contribution credits - cash flow hedge (490,041) (134,478) (328,698) (373,193)

16. TAX INSTALLMENTS PROGRAMS

16. TAX INSTALLMENTS PROGRAMS	12 Months Ended
	Dec. 31, 2018
Tax Installments Programs
TAX INSTALLMENTS PROGRAMS	The position of the Refis debts and other tax installment payment plans, recorded in taxes in installments in current and non-current liabilities, as mentioned in note 14, is as follows: Consolidated Current Non-current 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Federal REFIS Law 11.941/09 12,100 12,552 18,895 20,083 Federal REFIS Law 12.865/13 6,240 5,984 52,661 56,381 Other taxes in installments 1,839 3,015 2,378 2,778 20,179 21,551 73,934 79,242

17. PROVISION FOR TAX, SOCIAL S

17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS	12 Months Ended
	Dec. 31, 2018
Provision For Tax Social Security Labor Civil And Environmental Risks And Judicial Deposits
PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS	Claims of different nature are being challenged at the appropriate courts. Details of the accrued amounts and related judicial deposits are as follows: Consolidated Accrued liabilities Judicial deposits 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Tax 118,490 113,451 46,321 52,542 Social security 70,084 74,522 50,898 50,098 Labor 362,228 451,173 214,625 202,104 Civil 210,264 148,212 22,024 22,752 Environmental 31,390 37,733 1,900 1,826 Deposit of a guarantee 12,182 10,029 792,456 825,091 347,950 339,351 Classification Current 106,503 105,958 Non-current 685,953 719,133 347,950 339,351 792,456 825,091 347,950 339,351 The changes in the provision for tax, social security, labor, civil and environmental risks in the year ended December 31, 2018 were as follows: Consolidated Current + Non-current Nature 12/31/2017 Additions Net update on amount Net utilization of reversal 12/31/2018 Tax 113,451 17,941 12,081 (24,983) 118,490 Social security 74,522 2,348 1,996 (8,782) 70,084 Labor 451,173 29,250 55,344 (173,539) 362,228 Civil 148,212 14,921 56,092 (8,961) 210,264 Environmental 37,733 31 6,021 (12,395) 31,390 825,091 64,491 131,534 (228,660) 792,456 The provision for tax, social security, labor, civil and environmental liabilities was estimated by management and is mainly based on the legal counsel’s assessment and only proceedings for which the risk is classified as probable loss are accrued. Additionally, this provision includes tax liabilities resulting from lawsuits filed by the Company, subject to SELIC (Central Bank’s policy rate). Tax lawsuits The main tax lawsuits assessed by the outside legal counsel as probable losses which CSN or its subsidiaries are parties are as follows: (i) Municipal tax assessments (ISS) incident in lease contracts; (ii) Tax Forfeiture to collect ICMS reported but not paid; (iii) Consignment action for payment of social security contributions; (iv) collection of income tax and social contribution for the offset of nonexistent tax credits. Labor lawsuits As of December 31, 2018, the Group is a defendant in 7,665 labor lawsuits. Most of the claims relate to subsidiary and/or joint liability, salary equalization, health hazard premiums and hazardous duty premiums, overtime pay, health care plan, indemnity claims resulting from alleged occupational diseases or on-the-job accidents, breaks between working hours, and differences in profit sharing from 1997 to 1999 and from 2000 to 2003. During the year ended December 31, 2018 there were addition or write-off movements in labor lawsuits arising from the definite conclusion and the constant revision of the Company’s accounting estimates related to the provision for contingencies that take into consideration the different nature of the claims made, as required by the Company’s accounting policies. Civil lawsuits Among the civil lawsuits in which the Company is a defendant are claims for compensation. Generally, these lawsuits result from on-the-job accidents, occupational diseases and contractual litigation related to the industrial activities of the Group, real estate actions, healthcare plan. Environmental lawsuits The environmental administrative/judicial proceedings filed against the Company include mainly administrative proceedings for alleged environmental irregularities and the regularization of environmental permits; at the judicial level, the Company is a party to actions collecting the fines imposed for such alleged environmental irregularities and public civil actions claiming regularization coupled with compensation, in most cases claiming environmental recovery. In general, these proceedings arise from alleged impacts to the environment related to the Company’s industrial activities. The environmental processes present high complexity for estimating the value at risk, should be taken into consideration, among various aspects, procedural development, the extent of damage and the projection of repairing costs. There are other environmental processes for which it is not yet possible to assess the risk and contingency value due to the aforementioned complexity in estimation, the peculiarities of the matters involving them and also their procedural steps. The main processes of environmental nature are listed below: · In 2010, CSN signed a Term for Undertaking (“ Termos de Ajustamento de Conduta Instituto Estadual do Ambiente Autorização Ambiental de Funcionamento Within the context of the TAC 03/2016, upon the expiration of the environmental authorization, a renewal of the authorization was issued in 12/07/2017 by the Deliberation CECA/CFL nº 6.141 (“AA”) under n , published in the Diário Oficial During this period, the Company continued discussions with the Environmental Authorities of the State of Rio de Janeiro with a view to the consensual solution to the environmental issues of the plant, and on September 19, 2018, it was published in the Diário Oficial Secretaria do Estado do Meio Ambiente Comissão Estadual de Controle Ambiental This new TAC 07/2018 contemplates investments of approximately R$ 303 million in environmental projects and actions in the region up to August 2024 and represents a commitment of the Company to the sustainability of its activities, with the communities of Volta Redonda and the region, as well as with the generation of value to its shareholders, employees and other stakeholders. · In July 2012, the Public Ministry of the State of Rio de Janeiro, (“ Ministério Público do Estado do Rio de Janeiro Ministério Público Federal Superior Tribunal de Justica · In January 2014, it was distributed an Annulment Action with the purpose of declaring the nullity of an Assessment Notice issued by INEA for the alleged contamination of the soil and groundwater in the Volta Grande IV Condominium. The penalty was a simple fine, in the amount of R$ 35 million. The request for the preliminary suspension of the chargeability of the debt was not assessed, which is why INEA filed a Tax Enforcement Action. Declared connection between actions. An application for suspension of the procedure was filed until the conclusion of the investigation in the ACP Volta Grande IV. · With regards to other supposedly contaminated areas in Volta Redonda, the Public Ministry initiated three public civil actions claiming for environmental remediation and indemnification related to certain areas denominated Marcia I, II, III and IV, Wandir I and II and Reciclam. Regarding the latter, the definition from the responsible part to produce evidences still depends. These claims are at initial stage and we are currently performing environmental studies that will determine the extent of possible environmental damages related to soil contamination, as well as the action plan to fulfill with the legislation in force. As soon as the studies are concluded, they will be presented and added to the pleadings. · In 2015, the Public Federal Ministry initiated a public civil action against us claiming for the adequacy and regularization for the emission of particles from the UPV and the stoppage of its operations. In accordance with CONAMA Resolution n. º 436/2011, we have to adjust the emission of particles to match to the current legal standards required by December 2018, which should be compatible with the schedule of actions and measures foreseen in TAC 07/2018. · In 2016, we were mentioned in public civil action proposed by the Public Federal Ministry and the Public Ministry of the State of Rio de Janeiro in relation to a supposedly irregular waste deposit in the landfill area named "Aterro Panco". The claimings are for the recovery of degraded areas, compensation for damages to fauna and flora and to human health, as well as indemnification for material and moral damages caused to the environment. Due to the nature of this action and to the current stage of the pleading, this action is still considered as inestimable. · In 2004, the Public Federal Ministry initiated a public civil action against us for a supposedly environmental contamination and pollution of the Paraíba do Sul river supposedly caused by our industrial activities of UPV. The second federal regional court maintained the condemnation previously given and reinforced the obligation of the Company to compensate eventual environmental damages. We appealed to the Superior Court of Justice (STJ), which accepted the appeal and determined the pleading to return to the previous stage to resume the process. · A civil investigation is ongoing to assess (i) the environmental requisites to our project in the city of Arcos (cement plant); (ii) monitoring and mitigation of the environmental impacts of our productive activities; (iii) conformity of the conditions our our environmental licenses, including the creation of a museum in Corumbá ecological station and the establishment of a Private Reserve of the Natural Heritage; and (iv) measures for preservation of the cultural heritage and adoption of compensatory measures. In February 2011 a Term of Undertaking was signed (“TAC”) to assure the fulfillment of the obligations raised by the Public Ministry. The Ministerial Board has issued a clearance certificate to the major part of the TAC, except for two pending items that still remain open. · In 2009 and 2010, we signed Judicial Agreements (“TAJ”) with the Public Federal Ministry to recover environmental liabilities caused by our coal mining activities in the Southeast of Santa Catarina until the 90’s. The environmental liabilities reached by the TAJ include the restoration of certain degraded areas. In March 2018, the parties renegotiated a new agreement, with the extension of the construction schedule until 2030, which was legally approved on 06/06/18, and is in compliance by the Company. · In July 2018, the Company and Harsco Metals ("Harsco"), a contracted company, were named in a new public civil action jointly filed by the Federal Public Ministry and the Public Prosecutor's Office of the State of Rio de Janeiro, due to the irregular deposit of waste (steel slag) in the area called "Patio Volta Grande". The decision issued established a certain limitation in the monthly dispatch of the slag to the said yard, reduction of the height of the piles and removal of the excess of the stored material. The Company and Harsco have been looking for alternatives to solve this problem and are working on a plan of action with a feasible schedule, due to the concern with the impacts that can be generated by the abrupt removal of the yard material within the deadline established in the preliminary decision · In January 1995, in the Municipality of Volta Redonda/RJ (“MVR”), the ACP was filed claimed to CSN to comply with 26 items of Compensatory Environmental Programs. After the dispute, the parties entered into Transaction (1995), establishing CSN's effective obligations, as well as environmental compensation, ratified in court by judgment. The Municipality of Volta Redonda disagreed about the approved agreement and in 2015 the process of liquidation of unfulfilled obligations was initiated. On December 27, 2018, a new agreement was signed between CSN and the MRV, to put an end to the legal dispute, through reciprocal concessions from the parties, with the MVR expressly waiving the right on which the lawsuit is based and to CSN an additional investment in the amount of R$ 21 million, with 30% of this amount being allocated to services of environmental interest, preservation works, improvement and recovery of the quality of the environment of Volta Redonda. · In August 2017, CSN initiated an annulment action against the tax assessment notice that imposed a fine on CSN (R$ 22,038,856.09 – updated until January/19), for alleged pollution of the water of the Paraíba do Sul River, with discharge of effluent from the ETE of Blast Furnace # 2, due to accident occurred on 11/27/2010. The enforceability of the fine is suspended by virtue of an injunction granted in a writ of mandamus until final decision of the appeal phase that discusses the guarantee offered to the court (suitable guarantee) for the grant of guardianship. In relation to the mining activities matters, due to the accident involving a Brazilian mining company in November 2015, the State of Minas Gerais initiated several civil investigations based on the inventory of tailing dams of the State released in 2014. Those procedures have the scope of ascertaining those structures that do not have technical stability guaranteed by an external auditor or whose stability has not been attested due to a lack of documents or technical data · In March 2016 we were mentioned in a public civil action proposed by the State of Minas Gerais and by the State Environmental Foundation (“ Fundação Ambiental do Estado Dique do Engenho · Other administrative and judicial proceedings The table below shows a summary of the carrying amounts of the main legal matters with possible risk of loss and the amounts on December 31, 2018 and 2017. 12/31/2018 12/31/2017 Income tax / Social contribution - Assessment Notice and imposition of fine (AIIM) - Capital gain for an alleged sale of the shares of its subsidiary NAMISA. 11,812,071 11,073,961 Assessment Notice and Imposition of fine (AIIM) - Income tax/ Social contribution - gloss of goodwill deductions generated by the reverse merger of Big Jump by NAMISA 3,722,888 2,623,179 Assessment Notice and Imposition of fine (AIIM) - Income tax/ Social contribution - gloss of interest on prepayment arising from supply contracts of iron ore and port 2,165,088 2,500,606 Notices of violation and imposition of fine - Income taxes and social contribution due to profits from foreign subsidiaries (years 2008,2010 and 2011) (1) 1,891,149 1,858,640 Tax foreclosures - ICMS - Electricity credits 974,479 920,306 Installment MP 470 - Insufficient impairment of tax loss and negative basis (1) 704,739 Offset of taxes that were not approved by the Federal Revenue Service - IRPJ/CSLL, PIS/COFINS e IPI 1,481,382 1,685,648 Disallowance of the ICMS credits - Transfer of iron ore 529,607 499,006 ICMS - Refers to the transfer of imported raw material at an amount lower than the price disclosed in the import documentation 294,527 275,233 Disallowance of the tax losses arising on adjustments to the SAPLI 516,583 491,862 Taxes - ICMS - shipment and return of goods for industrialization (2) 816,199 Assessment Notice- Income tax- Capital Gain of CFM vendors located outside 243,007 203,185 CFEM - Divergence on the understanding between CSN and DNPM on the calculation basis 311,582 290,249 Infraction Notice - ICMS - Question on sales to Incentivized Zone 976,438 170,330 Other tax (federal, state, and municipal) lawsuits 3,625,167 3,065,131 Social security lawsuits 287,823 278,600 Law suit applied by Brazilian antitrust authorities (CADE) 101,683 98,189 Other civil lawsuits 922,171 1,111,944 Labor and social security lawsuits 1,537,078 1,569,712 Environmental process - ACP TAC / PAC - Compliance with environmental obligations (3) 216,878 Tax Enforcement Fine Volta Grande IV (4) 75,530 67,620 Others Enviromental lawsuits 144,235 117,858 31,612,488 30,639,075 (1) The Contingency was written off as a result of a final favorable decision by CARF, which recognized as certain the use of tax loss carryforwards used in the installment plan established by MP 470. (2) Homologation to the Secretary of Finance and General Advocacy of the State of Minas Gerais with the benefits brought in the Tax Regularization Program - "New Regularize", established by Law 22,549 / 2017. (3) We reclassified the contingency related to this judicial process (ACP TAC-PAC nº 0000689-17.1995.8.19.0066) to remote, due to the conclusion of an agreement between CSN and the Municipality of Volta Redonda (MVR) on 12/27/2018, which will put an end to the legal dispute, through reciprocal concessions from the parties, and the MVR expressly waives the right on which the action is based and to CSN the additional investment in the amount of R $ 21 million, and 30% services of environmental interest, preservation works, improvement and recovery of the quality of the environment of Volta Redonda (4) On April 8, 2013, INEA imposed on CSN a fine of R$ 35 million in respect of the aspects involving the Volta Grande IV condominium, determining that the actions already considered and discussed in the civil suit filed in July 2012. In connection with the application of this fine, an annulment action was distributed, in January 2014, to the 10th Civil Court of the State of Rio de Janeiro, seeking the annulment of the fine and its effects. In parallel, INEA filed a tax enforcement action in order to enforce the amount of the fine imposed. The aforementioned Tax Enforcement action was distributed in May 2014 to the 4th Volta Redonda Active Debt Registry in the State of Rio de Janeiro. Currently, said enforcement action is suspended until the judgment of the annulment action, in order to avoid conflicting decisions. The assessments made by the legal counsel define these administrative and judicial proceedings as entailing risk of possible loss and, therefore, no provision was recorded in conformity with Management’s judgment and accounting practices adopted in Brazil.

18. PROVISION FOR ENVIRONMENTAL

18. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS	12 Months Ended
	Dec. 31, 2018
Provision For Environmental Liabilities And Asset Retirement Obligations
PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS	The carrying amount of the provision for environmental liabilities and asset retirement obligation (ARO) are as follows: Consolidated 12/31/2018 12/31/2017 Environmental liabilities 198,386 255,517 Asset retirement obligations 83,380 81,496 281,766 337,013 18.a) Environmental liabilities As of December 31, 2018, there is a provision recognized for expenditures relating to environmental investigation and recovery services for potentially contaminated areas surrounding establishments in the States of Rio de Janeiro, Minas Gerais and Santa Catarina. Estimated expenditures will be reviewed periodically and the amounts already recognized will be adjusted whenever necessary. These are Management’s best estimates based on the environmental remediation studies and projects. This provision is recognized as other operating expenses. The provision is measured at the present value of the expenditures required to settle the obligation, using a pretax rate that reflects current market assessments of the time value of money and the specific risks of the obligation. The increase in the obligation due to passage of time is recognized as other operating expenses. The discount rate used to calculate the provision to present value through December 31, 2018 was 10.54% in real terms. The liability recognized is periodically updated based on the general market price index (IGP-M) for the period. Some contingent environmental liabilities are monitored by environmental department were not recorded in provisions due to its characteristics, they do not meet the recognition criteria present in IAS 37. 18.b) Asset retirement Asset retirement obligations refer to estimated costs for decommissioning, retirement or restoration of areas upon the termination of activities related to mining resources. The initial measurement is recognized as a liability discounted to present value and subsequently through increase in expenses over time. The asset retirement cost equivalent to the initial liability is capitalized as part of the carrying amount of the asset, being depreciated over the useful life of the asset. In 2015, the Company completed a new certification of iron mineral reserves in the Casa de Pedra and Engenho mines. This certification, prepared by a specialized company, has certified reserves of 3,021 million tons of iron ore.

19. RELATED-PARTY BALANCES AND

19. RELATED-PARTY BALANCES AND TRANSACTIONS	12 Months Ended
	Dec. 31, 2018
Related-party Balances And Transactions
RELATED-PARTY BALANCES AND TRANSACTIONS	19.a) Transactions with holding companies Vicunha Siderurgia S.A. is the Company’s main shareholder, with 49,24% of the voting shares. The Company’s control Vicunha Aços S.A. and Rio Iaco Participações S.A, the latter holding 4,22% of interest in the voting capital of the Company. The corporate structure of Vicunha Aços S.A is as follows: Vicunha Steel S.A. – holds 67.93% of Vicunha Aços S.A. CFL Participações S.A. – holds 12.82% of Vicunha Aços S.A. and 40% of Vicunha Steel S.A. Rio Purus Participações S.A. – holds 19.25% of Vicunha Aços S.A. and 60% of Vicunha Steel S.A. · Liabilities Companies Proposed Dividends Vicunha Aços 439,913 Rio Iaco Participações S.A. 37,640 Total at 12/31/2018 477,553 Total at 12/31/2017 - 19.b) Transactions with subsidiaries, joint ventures, associates, exclusive funds and other related parties · By transaction Consolidated Current Non-current Total 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Assets Trade receivables(note 6) 93,317 115,388 93,317 115,388 Dividends receivable (Note 8) 46,171 41,528 46,171 41,528 Actuarial asset (note 8) 99,894 111,281 99,894 111,281 Financial investments/ investments 92,332 53 92,332 53 Loans (note 8) 2,675 2,441 706,605 554,694 709,280 557,135 Other receivables (note 8) 3,649 3,577 218,840 30,770 222,489 34,347 238,144 162,987 1,025,339 696,745 1,263,483 859,732 Liabilities Other payables (Note 14) Accounts payable 29,286 799 96,629 125,915 799 Provision for consumption and services 6,213 2,298 6,213 2,298 Trade payables 135,801 134,974 135,801 134,974 Actuarial liabilities 7,982 41,937 7,982 41,937 171,300 138,071 104,611 41,937 275,911 180,008 By Transaction - Statement of Income 12/31/2018 12/31/2017 12/31/2016 P&L Revenues Sales 1,278,751 880,145 878,992 Interest (note 25) 64,888 61,549 60,964 Expenses Purchases (1,418,282) (1,176,930) (1,099,851) Interest (note 25) (16,092) (3,185) Foreing exchange and monetary variations, net 13,611 (18,398) (77,124) (235,236) (181,478) · By company - Assets and Liabilities Assets Liabilities Current Non-current Total Current Non-current Total Joint-venture and Joint-operation Itá Energética S.A. 2,550 2,550 MRS Logística S.A. 46,243 46,243 101,264 96,629.00 197,893 CBSI - Companhia Brasileira de Serviços e Infraestrutura 3 3 37,362 37,362 Transnordestina Logística S.A (1) 1,611 925,445 927,056 13,652 13,652 47,857 925,445 973,302 154,828 96,629 251,457 Other related parties CBS Previdência 99,894 99,894 7,982 7,982 Banco Fibra (2) 92,334 92,334 Usiminas Panatlântica (3) 53,027 53,027 15,643 15,643 Ibis Participações e Serviços Other related parties 2,092 2,092 829 829 147,453 99,894 247,347 16,472 7,982 24,454 Associates Arvedi Metalfer do Brasil S.A. 42,834 42,834 Total at 12/31/2018 238,144 1,025,339 1,263,483 171,300 104,611 275,911 Total at 12/31/2017 162,987 696,745 859,732 138,071 41,937 180,008 · By company - Statement of income Sales Purchases Finance income(expenses), net Exchange rate variations, net Total Joint ventures and Joint Operation MRS Logística S,A, (1,111,695) (16,092) (1,127,787) CBSI - Companhia Brasileira de Serviços e Infraestrutura 47 (180,332) (180,285) Transnordestina Logística S.A. (1) 367 (15,667) 50,003 34,703 414 (1,307,694) 33,911 (1,273,369) Other related parties Banco Fibra (2) 14,651 13,611 28,262 Usiminas (382) (382) Panatlântica (3) 1,174,984 (94,515) 1,080,469 Ibis Participações e Serviços (4,501) (4,501) Other related parties 2,745 (11,190) (8,445) 1,177,729 (110,588) 14,651 13,611 1,095,403 Associates Arvedi Metalfer do Brasil S,A, 100,608 234 100,842 Discontinued Operation Cia Metalic Nordeste Total 1,278,751 (1,418,282) 48,796 13,611 (77,124) 12/31/2017 Sales Purchases Finance income(expenses), net Total Joint ventures and Joint Operation Itá Energética S.A (32,275) (32,275) MRS Logística S.A. (934,279) (934,279) CBSI - Companhia Brasileira de Serviços e Infraestrutura 55 (150,758) (150,703) Transnordestina Logística S.A. (1) 2,549 (7,916) 53,261 47,894 2,604 (1,125,228) 53,261 (1,069,363) Other related parties Fundação CSN 13 (1,118) (1,105) Banco Fibra (2) 6,290 6,290 Usiminas (427) (427) Panatlântica (3) 872,047 (43,949) 828,098 Ibis Participações e Serviços (5,915) (5,915) Other related parties 2,821 (293) 2,528 874,881 (51,702) 6,290 829,469 Associates Arvedi Metalfer do Brasil S,A, 2,660 1,998 4,658 Discontinued Operation Cia Metalic Nordeste Total 880,145 (1,176,930) 61,549 (235,236) (1) Transnordestina Logística S.A: Assets: Refers mainly to contracts in R$: interest equivalent to 125.0% and 130.0% of CDI. On December 31, 2018, the borrowings carrying amounts totaled to R$706,605 (R$507,009 as of December 31, 2017). (2) Banco Fibra S.A: Assets: Refers mainly to Eurobond with Fibra Bank and maturity in february 2028. (3) Panatlântica:Receivables from the sale of steel products. 19.c) Other unconsolidated related parties · CBS Previdência The Company is its main sponsor, being a non-profit civil society established in July 1960, primarily engaged in the payment of benefits that supplement the official government Social Security benefits to participants. In its capacity as sponsor, CSN carries out transactions involving the payment of contributions and recognition of actuarial liabilities calculated in defined benefit plans. · Fundação CSN Nowadays, the Company develops socially responsible policies concentrated in Fundação CSN, of which it is the founder. The transactions between the parties are related to the operational and financial support for Fundação CSN to conduct the social projects, developed mainly in the localities where the Company operates. · Banco Fibra Banco Fibra is under the control structure of Vicunha Aços S.A., direct controller of the Company and the financial transactions carried out with this bank are limited to movements in checking accounts and financial investments in fixed-income securities. · Taquari Asset Belonging to the Vicunha Group, Taquari Asset is the group company responsible for managing third-party funds, funds and / or portfolios. · Companies under the control of a member of the Company’s management · Ibis Participações e Serviços Ltda. · Ibis Agrária Ltda · Partifib Projetos Imobiliários Ltda. · Vicunha Imóveis Ltda. · Vicunha Serviços Ltda. 19.d) Key management personnel The key management personnel with authority and responsibility for planning, directing and controlling the Company’s activities, include the members of the Board of Directors and statutory directors. The following is information on the compensation of such personnel and the related balances as of December 31, 2018. 12/31/2018 12/31/2017 12/31/2016 P&L Short-term benefits for employees and officers 32,848 39,721 71,852 Post-employment benefits 105 110 306 32,953 39,831 72,158

20. SHAREHOLDERS' EQUITY

20. SHAREHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2018
Shareholders Equity
SHAREHOLDERS' EQUITY	20.a) Paid-in capital Fully subscribed and paid-in capital as of December 31, 2018 and December 31, 2017 is R$4,540,000 comprising 1,387,524,047 book-entry common shares without par value. Each common share entitles its holder to one vote in Shareholders’ Meetings. 20.b) Authorized capital The Company’s bylaws in effect as of December 31, 2018 determine that the capital can be raised to up to 2,400,000,000 shares by decision of the Board of Directors. 20.c) Legal reserve This reserve is recognized at the rate of 5% of the profit for each period, as provided for by Article 193 of Law 6,404/76, up to the ceiling of 20% of share capital. 20.d) Ownership structure As of December 31, 2018, the Company’s ownership structure was as follows: 12/31/2018 12/31/2017 Number of common shares % of total shares % of voting capital Number of common shares % of total shares % of voting capital Vicunha Aços S.A. (*) 679,522,254 48.97% 49.24% 682,855,454 49.21% 50.32% Rio Iaco Participações S.A. (*) 58,193,503 4.19% 4.22% 58,193,503 4.19% 4.29% NYSE (ADRs) 284,152,319 20.48% 20.59% 303,590,364 21.88% 22.37% Other shareholders 358,246,471 25.82% 25.95% 312,493,726 22.52% 23.02% Total shares outstanding 1,380,114,547 99.47% 100.00% 1,357,133,047 97.81% 100.00% Treasury shares 7,409,500 0.53% 30,391,000 2.19% Total shares 1,387,524,047 100.00% 1,387,524,047 100.00% (*) Controlling group companies. 20.e) Treasury shares The Board of Directors authorized various share buyback programs in order to hold shares in treasury for subsequent disposal and/or cancelation with a view to maximizing the generation of value to the shareholder through an efficient capital structure management, as shown in the table below: Program Board’s Authorization Authorized quantity Program period Average buyback price Minimum and maximum buyback price Number bought back Share cancelation Disposal of shares Balance in treasury 1º 3/13/2014 70,205,661 From 3/14/2014 to 4/14/2014 R$ 9.34 R$ 9,22 and R$ 9,45 2,350,000 2,350,000 2º 4/15/2014 67,855,661 From 4/16/2014 to 5/23/2014 R$ 8.97 R$ 8,70 and R$ 9,48 9,529,500 11,879,500 3º 5/23/2014 58,326,161 From 5/26/2014 to 6/25/2014 R$ 9.21 R$ 8,61 and R$ 9,72 31,544,500 43,424,000 4º 6/26/2014 26,781,661 From 6/26/2014 to 7/17/2014 R$ 10.42 R$ 9,33 and R$ 11,54 26,781,661 70,205,661 7/18/2014 Not applicable Not applicable 60,000,000 (1) 10,205,661 5º 7/18/2014 64,205,661 From 7/18/2014 to 8/18/2014 R$ 11.40 R$ 11.40 240,400 10,446,061 8/18/2014 Not applicable Not applicable 10,446,061 (1) 6º 8/18/2014 63,161,055 From 8/19/2014 to 9/25/2014 R$ 9.82 R$ 9,47 and R$ 10,07 6,791,300 6,791,300 7º 9/29/2014 56,369,755 From 9/29/2014 to 2/29/2014 R$ 7.49 R$ 4,48 and R$ 9,16 21,758,600 28,549,900 8º 12/30/2014 34,611,155 From 12/31/2014 to 3/31/2015 R$ 5.10 R$ 4,90 and R$ 5,39 1,841,100 30,391,000 9º (*) 03/31/2015 32,770,055 From 4/01/2015 to 6/30/2015 30,391,000 04/20/2018 30,391,000 From 4/20/2018 to 4/30/2018 Não aplicável Não aplicável R$ 0.00 R$ 0.00 22,981,500 (2) 7,409,500 (*) There were no share buyback in this program. (1) In 2014 the Board of Directors approved the cancelation of 70,446,061 treasury shares without change in the Company’s share capital. (2) In April 2018, the Board of Directors authorized the sale of up to 30,391,000 common shares held in treasury. Until the end of the program, 22,981,500 shares were sold for R$213,494. The Company. The Company recognized a profit on the sale of the shares in the amount of the amount of R$32,670. As of December 31, 2018, the position of the treasury shares was as follows: Quantity purchased (Units) Amount paid for the shares Share price Market value of shares in 12/31/2018 (*) Minimum Maximum Average 7,409,500 R$ 58,264 R$ 4.48 R$ 10.07 R$ 7.86 R$ 65,500 (*) Using the last share average quotation on B3 S.A. - Brasil, Bolsa, Balcão as of September 30, 2018 of R$ 8.84 per share. 20.f) Policy on investments and payment of interest on capital and dividends The Company adopts a profit distribution policy which, after compliance with the provisions in Law 6,404/76, as amended by Law 9,457/97, will entail the allocation of all the profit to the Company’s shareholders, provided that the following priorities are observed, irrespective of their order: (i) carrying out the business strategy; (ii) fulfilling its obligations; (iii) making the required investments; and (iv) maintaining a healthy financial situation of the Company. 20.g) Earnings/(loss) per share: Basic earnings per share were calculated based on the profit/loss attributable to the owners of CSN divided by the weighted average number of common shares outstanding during the year, excluding the common shares purchased and held as treasury shares, as follows: 12/31/2018 12/31/2017 12/31/2016 Common Shares (Loss) profit for the year Continued operations 5,074,136 10,272 (925,186) Discontinued operations - - (9,561) 5,074,136 10,272 (934,747) Weighted average number of shares 1,373,250,595 1,357,133,047 1,357,133,047 Basic and diluted EPS Continued Operations 3.69498 0.00757 (0.68172) Discontinued Operations - - (0.00704) 3.69498 0.00757 (0.68876) The Company does not hold potential dilutable outstanding ordinary shares that could result in dilution of earnings per share.

21. PAYMENT TO SHAREHOLDERS

21. PAYMENT TO SHAREHOLDERS	12 Months Ended
	Dec. 31, 2018
Payment To Shareholders
PAYMENT TO SHAREHOLDERS	The Company's Bylaws provide the distribution of 25% minimum dividends of adjusted net income under the law, to the shareholders. The dividends are calculated in accordance with the Company’s Bylaws and in accordance with the Brazilian Corporate Law. The following is the calculation of dividends for 2018: Allocation of profits 12/31/2018 Profit for the year 5,074,136 Absorption of deficits (1,291,689) Legal reserve (189,122) Allocation of profits 3,593,325 Proposed destination: Mandatory minimum dividends (898,332) Intended for statutory reserve of working capital (2,694,993) In current liabilities Dividends to be paid on December 31, 2017 2,209 Mandatory minimum dividends 898,332 Dividends to be paid on December 31, 2018 900,541 Weighted average number of shares 1,373,251 Dividends per share approved 0.65416 The following table shows the history of deliberate and paid dividends: Approval Year Dividends Payment Year Dividends 2017 (*) 0,00 2017 0,00 2018 898,332 2018 0,00 Total approved 898,332 Total paid (*) There was no resolution on dividend distribution during the year of 2017.

22. NET SALES AND SERVICES REVE

22. NET SALES AND SERVICES REVENUE	12 Months Ended
	Dec. 31, 2018
Net Sales And Services Revenue
NET SALES AND SERVICES REVENUE	Net sales revenue is comprised as follows: Consolidated 12/31/2018 12/31/2017 12/31/2016 Gross revenue Domestic market 14,752,901 11,487,011 10,206,195 Foreign market 11,817,559 9,980,572 9,571,630 26,570,460 21,467,583 19,777,825 Deductions Canceled sales, discounts and rebates (234,851) (262,989) (190,415) Taxes on sales (3,366,724) (2,679,993) (2,438,461) (3,601,575) (2,942,982) (2,628,876) Net revenue 22,968,885 18,524,601 17,148,949

23. EXPENSES BY NATURE

23. EXPENSES BY NATURE	12 Months Ended
	Dec. 31, 2018
Expenses By Nature
EXPENSES BY NATURE	EXPENSES BY NATURE Consolidated 12/31/2018 12/31/2017 12/31/2016 Raw materials and inputs (6,759,275) (5,404,801) (4,518,718) Labor cost (2,743,460) (2,400,579) (2,482,111) Supplies (1,782,576) (1,451,437) (1,384,437) Maintenance cost (services and materials) (1,326,894) (1,145,974) (1,203,294) Outsourcing services (2,368,387) (2,062,352) (2,228,786) Freights (1,802,541) (1,362,087) (1,263,734) Depreciation, Amortization and depletion (Note 10,11, and 26) (1.175.107) (1,408,765) (1,278,816) Others (905,128) (591,094) (495,274) (18,863,368) (15,827,089) (14,855,170) Classified as: Cost of sales (16,105,657) (13,596,141) (12,640,042) Selling expenses (2,263,688) (1,815,107) (1,696,896) General and administrative expenses (494,023) (415,841) (518,232) (18,863,368) (15,827,089) (14,855,170) The depreciation, amortization and depletion additions for the year were distributed as follows: ConsColi Consolidated 12/31/2018 12/31/2017 12/31/2016 Production costs 1,145,793 1,376,862 1,241,425 Sales expenses 5,850 8,851 9,163 General and Administrative Expenses 23,464 23,052 28,228 1,175,107 1,408,765 1,278,816 Other operating expenses (*) 97,914 44,570 43,681 1,273,021 1,453,335 1,322,497 (*) Refers mainly to the depreciation and amortization of paralyzed assets, see note 24.

24. OTHER OPERATING INCOME (EXP

24. OTHER OPERATING INCOME (EXPENSES)	12 Months Ended
	Dec. 31, 2018
Other Operating Income
OTHER OPERATING INCOME (EXPENSES)	Co Consolidated solidado 12/31/2018 12/31/2017 12/31/2016 Other operating income Indemnities 46,256 6,106 26,871 Rentals and leases 5,430 1,841 1,483 Dividends received 9,188 3,248 567 PIS and COFINS to compensate (1) 1,102,365 Extemporaneous PIS/COFINS credits 203,504 Contractual fines 3,965 2,970 2,501 Gain on business combination 66,496 Actuarial pension plan 20,983 36,952 48,790 Gain ons sale of assets held for sale 252,023 Updated shares – Fair Value through profit or loss (VJR) (Note 13) 1,655,813 Eletrobrás's compulsory loan (3) 755,151 Gain on sale of LLC (note 3) 1,164,294 Debts write off - intragroup Other revenues 27,749 18,018 61,274 4,036,043 824,286 663,509 Other operating expenses Taxes and fees (26,197) (136,348) (88,249) Write-off/(Provision) of judicial deposits (54,330) (38,258) (64,886) Expenses with environmental liabilities, net (60,311) (7,156) (5,023) Expenses from tax, social security, labor, civil and environmental lawsuits, net (59,219) (95,744) (151,534) Contractual fines (2) (104,086) (16,624) Depreciation of equipment paralyzed and amortization of intangible assets (note 23) (97,914) (44,570) (43,681) Write- off of PP&E and intangible assets (notes 10 and 11) (27,260) (28,127) (88,339) Estimated (Loss)/reversal in inventories (149,704) (15,775) (29,316) Studies and project engineering expenses (33,738) (32,956) (31,156) Research and development expenses (2,688) (3,944) (2,269) Advisory expenses (508) (3,419) (20,865) Healthcare plan expenses (108,369) (97,837) (80,489) Reversal/(Provision) industrial reestructuring (17,490) 5,807 96,390 Cash flow hedge realized (Note 13 b) (370,191) (92,140) (77,444) Impairment of fair value of Transnordestina (387,989) Other expenses (218,701) (56,477) (85,256) (1,330,706) (646,944) (1,076,730) Other operating income (expenses), net 2,705,337 177,342 (413,221) (1) Refers to non-inclusion of ICMS in the PIS and COFINS calculation basis, see note nº8. (2) In 2018, refers to the contractual amendment with the jointly-owned subsidiary MRS, for the revision of the “Anual Transportation Plan”. (3) This is a net amount, certain and due, arising from the final judicial decision favorable to the Company, which is irreversible and irrevocable, in order to apply the STJ's consolidated position on the subject, which culminated in sentencing the Eletrobrás to the payment of the correct interest and monetary correction of the Compulsory Loan. The final judicial decision, as well as the certainty about the amounts involved in the settlement of the judgment (judicial procedure to request the satisfaction of the right), allowed the conclusion that the right to receive this value is certain. Thus, in line with our legal and accounting advisors, we recognize the credits in noncurrent assets against the result of Other Operating Revenues. The monetary adjustment of 2018 is presented in the note nº25 - Financial Income (Expenses).

25. FINANCIAL INCOME (EXPENSES)

25. FINANCIAL INCOME (EXPENSES)	12 Months Ended
	Dec. 31, 2018
Financial Income
FINANCIAL INCOME (EXPENSES)	Consolidated 12/31/2018 12/31/2017 12/31/2016 Financial income Related parties (note 19 b) 64,888 61,549 60,964 Income from financial investments 111,235 162,292 301,401 Gain from derivative 28,503 5,829 Gain on repurchase of debt securities 146,214 Other income (1) 1,134,391 42,730 129,182 1,310,514 295,074 643,590 Financial expenses Borrowings and financing - foreign currency (988,821) (827,841) (930,508) Borrowings and financing - local currency (1,020,867) (1,610,714) (2,229,849) Related parties (note 19 b) (16,092) (3,185) Capitalized interest (notes 10 and 30) 71,611 91,957 215,794 Losses on derivatives (362) Interest, fines and late payment charges (71,100) (72,343) (38,002) Commission and bank fees (182,179) (159,088) (155,249) PIS/COFINS over financial income (84,404) (21,926) (39,154) Other financial expenses 19,614 (142,296) (102,450) (2,272,238) (2,742,251) (3,282,965) Inflation adjustment and exchange differences, net Inflation adjustments, net (1,035) (10,556) 7,865 Exchange rates, net (532,883) (5,665) 921,310 Exchange gain (losses) on derivatives (1) (229) (812,227) (533,919) (16,450) 116,948 Financial income (expenses), net (1,495,643) (2,463,627) (2,522,427) Statement of gains and (losses) on derivative transactions Future Dollar (805,760) Dollar - to - euro swap (1) (229) (6,467) (1) (229) (812,227) Swap Pré x CDI (299) Swap CDI x Pré (63) Future DI 28,503 5,829 28,503 5,467 (1) 28,274 (806,760) (1) Refers mainly to the monetary adjustment of the recognition of the non-inclusion of ICMS in the PIS and COFINS calculation basis of prior years in the amount of R$ 1,106,097, see note 8.

26. SEGMENT INFORMATION

26. SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2018
Segment Information
SEGMENT INFORMATION	According to the Group´s structure, the businesses are distributed and managed in five operating segments as follows: · Steel The Steel Segment consolidates all the operations related to the production, distribution and sale of flat steel, long steel, metallic containers and galvanized steel, with operations in Brazil, United States, Portugal and Germany. The Segment supplies the following markets: construction, steel containers for the Brazilian chemical and food industries, home appliances, automobile and OEM (motors and compressors). The Company’s steel units produce hot and cold rolled steel, galvanized and pre-painted steel of great durability. They also produce tinplate, a raw material used to produce metallic containers. Overseas, Lusosider, which is based in Portugal, produces cold rolled steel and galvanized steel. CSN LLC in the U.S.A. meets local market needs, import and export of steel products. In January 2012, CSN acquired Stahlwerk Thüringen (SWT), a manufacturer of long steel located in Unterwellenborn, Germany. SWT is specialized in the production of shapes used for construction. In January 2014 the production of long steel products started in Brazil and consolidates the company as a source of complete construction solutions, complementing its portfolio of products with high value added in the steel chain. · Mining This segment encompasses the activities of iron ore and tin mining. The high quality iron ore operations are located in the Iron Quadrilateral in Minas Gerais, which has its own mines and sells third party iron ore. At the end of 2015, CSN and the Asian Consortium formalized a shareholders' agreement for the combination of assets linked to iron ore operations and the related logistics structure, forming a new company that has focused in mining of the Group activities from December 2015. In this context, the new company, currently named CSN Mineração S.A., holds the TECAR arraignment, the Casa de Pedra mine and all the shares of Namisa, which was incorporated on December 31, 2015. CSN still owns 100% of Minérios Nacional which includes the mines of Fernandinho (operational), Cayman and Pedras Pretas (mineral resources), all located in Minas Gerais. Moreover, CSN controls the Estanho de Rondônia S.A., company with mining units and tin casting, in the state of Rondonia. · Logistics i. Railroad CSN has equity interests in three railroad companies: MRS Logística, which manages the former Southeast Network of Rede Ferroviária Federal S.A. (RFFSA), Transnordestina Logística S.A. and FTL - Ferrovia Transnordestina Logística S.A., which has the concession to operate the former Northeast Network of the RFFSA in the states of Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco and Alagoas. a) MRS The railroad transportation services provided by MRS are fundamental to the supply of raw materials and the shipment of final products. The total amount of iron ore, coal and coke consumed by the Presidente Vargas Mill as well as part of the steel produced by CSN for the domestic market and for export are carried by MRS. The Southeast Brazilian railroad system, encompassing 1,674 kilometers of tracks, serves the tri-state industrial area of São Paulo-Rio de Janeiro-Minas Gerais, in the southeast region, linking the mines located in Minas Gerais to the ports located in São Paulo and Rio de Janeiro, and the steel mills of CSN, Companhia Siderúrgica Paulista, or Cosipa, and Gerdau Açominas. Besides serving other customers, the railroad system carries iron ore from the Company’s mines in Casa de Pedra, Minas Gerais, and coke and coal from the Itaguaí Port, in Rio de Janeiro, to Volta Redonda, and carries CSN’s export products to the ports of Itaguaí and Rio de Janeiro. b) TLSA and FTL TLSA and FTL hold the concession of the former RFFSA’s Northeast Network. The Northeast Network totals 4,238 km, divided into two sections: i) Network I, which comprises the São Luiz–Mucuripe, Arrojado–Recife, Itabaiana–Cabedelo, Paula Cavalcante–Macau, and Propriá–Jorge Lins (Network I); and ii) Network II, which comprises the Missão Velha–Salgueiro, Salgueiro–Trindade, Trindade– Eliseu Martins, Salgueiro–Porto de Suape, and Missão Velha–Porto de Pecém sections. The Network links up with the main ports in the region, offering an important competitive advantage by means of opportunities for combined transportation solutions and logistics projects tailored to customer needs. II. Port Logistics The Port Logistics Segment consolidates the operation of the terminal built in the privatization period after the law of modernization of the ports (law 8.630/1993) that permits to transfer the port logistics activities to the private sector. The Sepetiba terminal features complete infrastructure to meet all the needs of exporters, importers and ship owners. Its installed capacity exceeds that of most other Brazilian terminals. It has mooring berths and a huge storage area, as well as the most modern and appropriate equipment, systems and intermodal connections. · Energy CSN is one of the largest industrial consumers of electric power in Brazil. As energy is fundamental in its production process, the Company invests in assets for generation of electric power to guarantee its self-sufficiency. These assets are as follows: Itá hydroelectric power plant, in the State of Santa Catarina, with rated capacity of 1,450 MW, where CSN has a share of 29.5%; Igarapava hydroelectric power plant, Minas Gerais, with rated capacity of 210 MW, in which CSN holds 17.9% of the capital; and a thermoelectric co-generation Central unit with rated capacity of 238 MW, which has been operating at the UPV since 1999, that uses the residual gases produced by the steel mill itself. · Cement The cement division consolidates the cement production, distribution and sale operations, which use the slag produced by the Volta Redonda plant’s blast furnaces. In the second half of 2016, the Company started the operation of a new clinker furnace in Arcos/MG, where the Company already operates a clinker furnace using its limestone of a company-owned mine and also two cement mills in additions to the mills that already operate in Volta Redonda/RJ. The information presented to Management regarding the performance of each business segment is generally derived directly from the accounting records, combined with some intercompany allocations. · Sales by geographic area Sales by geographic area are determined based on the customers’ location. On a consolidated basis, domestic sales are represented by revenues from customers located in Brazil and export sales are represented by revenues from customers located abroad. · Result by Segment Beginning 2013, the Company no longer proportionately consolidates joint ventures MRS and CBSI. For segment information preparation and presentation purposes, Management decided to maintain the proportionate consolidation of the joint ventures, as historically presented. For consolidated profit reconciliation purposes, the amounts of these companies were eliminated in the column “Corporate expenses/elimination”. 12/31/2018 P&L Steel Mining Logistics Energy Cement Corporate expenses/elimination Consolidated Port Railroads Metric tons (thou.) (*) (unaudited) 5,068,758 34,780,756 (4,961,345) Net revenues Domestic market 10,328,372 972,360 266,378 1,506,114 410,606 588,230 (2,718,623) 11,353,437 Foreign market 5,305,771 5,012,421 1,297,256 11,615,448 Total net revenue (note 22) 15,634,143 5,984,781 266,378 1,506,114 410,606 588,230 (1,421,367) 22,968,885 Cost of sales and services (12,613,216) (3,585,691) (189,999) (1,049,071) (286,734) (544,266) 2,163,320 (16,105,657) Gross profit 3,020,927 2,399,090 76,379 457,043 123,872 43,964 741,953 6,863,228 General and administrative expenses (984,980) (144,754) (35,423) (106,412) (27,948) (95,893) (1,362,301) (2,757,711) Depreciation (note 23) 609,274 366,547 20,368 258,985 17,285 115,411 (212,763) 1,175,107 Proportionate EBITDA of joint ventures 568,045 568,045 Adjusted EBITDA 2,645,221 2,620,883 61,324 609,616 113,209 63,482 (265,066) 5,848,669 Sales by geographic area Asia 40,681 4,422,377 1,297,256 5,760,314 North America 1,506,041 1,506,041 Latin America 369,830 369,830 Europe 3,330,991 590,044 3,921,035 Others 58,228 58,228 Foreign market 5,305,771 5,012,421 1,297,256 11,615,448 Domestic market 10,328,372 972,360 266,378 1,506,114 410,606 588,230 (2,718,623) 11,353,437 Total 15,634,143 5,984,781 266,378 1,506,114 410,606 588,230 (1,421,367) 22,968,885 12/31/2017 P&L Steel Mining Logistics Energy Cement Corporate expenses/elimination Consolidated Port Railroads Metric tons (thou.) (*) (unaudited) 4,921,719 32,576,843 (5,359,571) Net revenues Domestic market 7,818,552 829,268 238,240 1,416,612 407,671 487,129 (2,491,006) 8,706,466 Foreign market 5,140,471 3,791,703 885,961 9,818,135 Total net revenue (note 22) 12,959,023 4,620,971 238,240 1,416,612 407,671 487,129 (1,605,045) 18,524,601 Cost of sales and services (10,537,547) (3,005,840) (156,997) (1,024,696) (285,085) (512,762) 1,926,786 (13,596,141) Gross profit 2,421,476 1,615,131 81,243 391,916 122,586 (25,633) 321,741 4,928,460 General and administrative expenses (963,822) (158,958) (27,943) (94,921) (27,098) (80,823) (877,383) (2,230,948) Depreciation (note 23) 658,587 490,805 15,752 294,571 17,265 121,801 (190,016) 1,408,765 Proportionate EBITDA of joint ventures 538,170 538,170 Adjusted EBITDA 2,116,241 1,946,978 69,052 591,566 112,753 15,345 (207,488) 4,644,447 Sales by geographic area Asia 23,364 3,592,226 885,961 4,501,551 North America 2,009,337 2,009,337 Latin America 506,951 506,951 Europe 2,564,823 197,701 2,762,524 Others 35,996 1,776 37,772 Foreign market 5,140,471 3,791,703 885,961 9,818,135 Domestic market 7,818,552 829,268 238,240 1,416,612 407,671 487,129 (2,491,006) 8,706,466 Total 12,959,023 4,620,971 238,240 1,416,612 407,671 487,129 (1,605,045) 18,524,601 12/31/2016 P&L Steel Mining Logistics Energy Cement Corporate expenses/elimination Consolidated Port Railroads Metric tons (Thou) (*) (unaudited) 4,857,174 36,983,297 (4,062,774) Net revenues Domestic market 6,980,087 542,028 207,722 1,319,907 269,095 490,608 (2,079,534) 7,729,913 Foreign market 4,535,821 4,039,875 843,340 9,419,036 Total Net Revenue (note 22) 11,515,908 4,581,903 207,722 1,319,907 269,095 490,608 (1,236,194) 17,148,949 Cost of sales and services (9,393,237) (3,099,236) (141,542) (914,361) (195,994) (467,373) 1,571,701 (12,640,042) Gross profit 2,122,671 1,482,667 66,180 405,546 73,101 23,235 335,507 4,508,907 General and administrative expenses (914,927) (185,149) (25,180) (83,020) (25,196) (74,528) (907,128) (2,215,128) Depreciation (note 23) 679,074 461,287 13,430 227,792 17,140 73,030 (192,937) 1,278,816 Proportionate EBITDA of joint ventures 502,345 502,345 Adjusted EBITDA 1,886,818 1,758,805 54,430 550,318 65,045 21,737 (262,213) 4,074,940 Sales by geographic area Asia 30,815 3,519,713 843,340 4,393,868 North America 1,891,865 1,891,865 Latin America 259,640 259,640 Europe 2,324,580 434,378 2,758,958 Others 28,921 85,784 114,705 Foreign market 4,535,821 4,039,875 843,340 9,419,036 Domestic market 6,980,087 542,028 207,722 1,319,907 269,095 490,608 (2,079,534) 7,729,913 Total 11,515,908 4,581,903 207,722 1,319,907 269,095 490,608 (1,236,194) 17,148,949 (*) The ore sales volumes presented in this note take into consideration Company sales and the interest in its subsidiaries and joint ventures. · Adjusted EBITDA Adjusted EBITDA is the main measurement based on which the chief operating decision maker assesses the segment performance and the capacity to generate recurring operating cash, consisting of profit for the year less net financial income (expenses), income tax and social contribution, depreciation and amortization, equity in results of affiliated companies, results of discontinued operations and other operating income (expenses), plus the proportionate EBITDA of joint ventures. Even though it is an indicator used in segment performance measurement, EBITDA is not a measurement recognized by accounting practices adopted in Brazil or IFRS, it does not have a standard definition, and may not be comparable with measurements using similar names provided by other entities. As required by IFRS 8, the table below shows the reconciliation of the measurement used by the chief operating decision maker with the results determined using the accounting practices: 12/31/2018 12/31/2017 12/31/2016 Net income / (loss) for the year 5,200,583 111,229 (853,058) Result from discontinued operations 9,561 Depreciation / amortization / depletion (note 23) 1,175,107 1,408,765 1,278,816 Income tax and social contribution (note 15) 250,334 409,109 266,546 Financial income / (expenses) (note 25) 1,495,643 2,463,627 2,522,427 EBITDA 8,121,667 4,392,730 3,224,292 Other operating (income) / expenses (note 24) (2,705,337) (177,342) 413,221 Equity in results of affiliated companies (135,706) (109,111) (64,918) Proportionate EBITDA of joint ventures 568,045 538,170 502,345 Adjusted EBITDA (*) 5,848,669 4,644,447 4,074,940 (*) The Company discloses its adjusted EBITDA net of its share of investments and other operating income (expenses) because it understands that these should not be included in the calculation of recurring operating cash generation.

27. EMPLOYEE BENEFITS

27. EMPLOYEE BENEFITS	12 Months Ended
	Dec. 31, 2018
Employee Benefits
EMPLOYEE BENEFITS	The pension plans granted by the Company cover substantially all employees. The plans are administered by Caixa Beneficente dos Empregados da CSN (‘CBS”), a private non-profit pension fund established in July 1960 which has as members the employees (and former employees) of the Company and some subsidiaries who joined the fund through an agreement, and the employees of CBS itself. The Executive Officers of CBS is formed by a CEO and two other executive officers, all appointed by CSN, which is the main sponsor of CBS. The Decision-Making Board is the higher decision-making and guideline-setting body of CBS, composed by the president and ten members, six chosen by CSN, and four elected by the fund’s participants. Until December 1995, CBS Previdência administered two defined benefit plans based on years of service, salary and Social Security benefits. On December 27, 1995 the then Private Pension Secretariat (“SPC”) approved the implementation of a new benefit plan, effective beginning that date, called Mixed Supplementary Benefit Plan (‘Mixed Plan”), structured in the form of a variable contribution plan that was discontinued on September 16, 2013. As of that date, all new employees must join the CBSPrev Plan, structured in the defined contribution modality, created also in September 2013. As of December 31, 2018 CBS had 34,985 participants (35,176 as of December 31, 2017), of whom 20,872 were active contributors (20,734 as of December 31, 2017), 13,454 were retired employees (13,587 as of December 31, 2017), and 659 were related beneficiaries (855 as of December 31, 2017). Out of the total participants as of December 31, 2018, 11,063 belonged to the defined benefit plan, 11,845 to the mixed plan, 1,028 to the CBSPrev Namisa plan, and 11,049 to the CBSPrev plan. The plan assets of CBS are primarily invested in repurchase agreements (backed by federal government securities), federal government securities indexed to inflation, shares, loans and real estate. As of December 31, 2018, CBS held 37,084,031 common shares of CSN (20,143,031 as of December 31,2017). The total plan assets of the entity amounted to R$5.3 billion as of December 31, 2018 (R$5.1 billion as of December 31, 2017). The administrators of the CBS funds seek to match plan assets with benefit obligations payable on a long-term basis. Pension funds in Brazil are subject to certain restrictions regarding their capacity for investment in foreign assets and, therefore, these funds invest mainly in Brazilian securities. Plan Assets are all available assets and the benefit plans’ investments, not including the amounts of debts to sponsors. For the defined benefit plans, called “35% of the average salary” and “average salary supplementation plan”, the Company holds a financial guarantee with CBS Previdência, the entity that administers said plans, to ensure their financial and actuarial balance, in the event of any future actuarial loss or actuarial gain. As provided for in the prevailing law that governs the pension fund market, for the last 4 years ended (2015, 2016, 2017 and 2018), CSN did not have to pay the installments because the defined benefit plans posted actuarial gains for the period. 27.a) Description of the pension plans Plan covering 35% of the average salary This plan began on February 1, 1966 and is a defined benefit plan aimed at paying pensions (for length of service, special situations, disability or old age) on a lifetime basis, equivalent to 35% of the adjusted average of the participant’s salary for the last 12 months. The plan also guarantees sick pay to participants on Official Social Security leaves of absence and further ensures payments of savings fund, funeral allowance and pecuniary aid. This plan was discontinued on October 31, 1977 when took effect the average salary supplementation plan. Average salary supplementation plan This plan began on November 1, 1977 and is a defined benefit plan aimed at complementing the difference between the adjusted average of the participant’s salary for the last 12 months and the Official Social Security benefit for retirement, also on a lifetime basis. As in the 35% plan, there is coverage for the benefits of sick pay, death and pension. This plan was discontinued on December 26, 1995 with the creation of the mixed supplementary benefit plan. Mixed supplementary benefit plan This plan began on December 27, 1995 and is a variable contribution plan. Besides the scheduled retirement benefit, it also covers the payment of risk benefits (pension paid while the participant is still working, disability compensation and sick/accident pay). Under this plan, the retirement benefit is calculated based on the amount accumulated by the monthly contributions of the participants and sponsors, as well as on each participant’s option for the manner in which they receive them, which can be lifetime (with or without continuity of pension for death) or through a percentage applied to the balance of the benefit-generating fund (loss for indefinite period). After retirement is granted, the plan takes on the characteristics of a defined benefit plan if the participant has chosen to receive his benefit in the form of monthly income for life. This plan was discontinued on September 16, 2013 when the CBS Prev plan became effective. CBS Prev Plan The new CBS Prev Plan, which is a defined contribution plan, started on September 16, 2013. Under this plan, the retirement benefit is determined based on the accumulated amount by monthly contributions of participants and sponsors. To receive the benefit, each participant can opt for: (a) receiving part in cash (up to 25%) and the remaining balance through a monthly income through a percentage applied to the benefit-generating fund, not being applicable to death pension benefits, or (b) receive only a monthly income through a percentage applied to the benefit-generating fund. With the creation of the CBS Prev Plan, the mixed supplementary benefit plan was discontinued for the entry of new participants as from September 16, 2013. CBSPREV Namisa Plan It is a Defined Contribution plan with benefits of risks during the activity (projection of the balances in case of disability or death and sickness / accident allowanced). It has been in operation since January 6, 2012, when it was created exclusively for the employees of Nacional Minérios S.A. After the corporate reorganization, which took place in 2016, other Sponsors joined this Plan, among them CSN Mineração S.A. Under this plan, all the benefits offered are calculated based on the accumulated amount from the monthly contributions of participants and sponsors, and are paid through a percentage applied to the balance of the benefit generating fund. The CBSPREV Namisa Plan is closed since July 2017. 27.b) Investment policy The investment policy establishes the principles and guidelines that will govern the investments of funds entrusted to the entity, in order to foster the security, liquidity and profitability required to ensure equilibrium between the plan’s assets and liabilities based on an ALM (Asset Liability Management) study that takes into consideration the benefits of participants and beneficiaries for each plan. The investment plan is reviewed annually and approved by the Decision-Making Board considering a five-year horizon, as established by resolution CGPC 7 of December 4, 2003. The investment limits and criteria established in the policy are based on Resolution 3,792/09 published by the National Monetary Council (“CMN”). 27.c) Employee benefits The actuarial calculations are updated at the end of each annual reporting period by outside actuaries and presented in the financial statements pursuant to IAS19 - Employee Benefits. Consolidated 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Actuarial asset Actuarial liabilities Benefits of pension plans (99,894) (111,281) 7,982 41,937 Post-employment healthcare benefits - - 897,137 866,784 (99,894) (111,281) 905,119 908,721 The reconciliation of employee benefits’ assets and liabilities is as follows: 12/31/2018 12/31/2017 Present value of defined benefit obligation 3,087,433 3,077,849 Fair value of plan assets (3,403,906) (3,305,356) Deficit(Surplus) (316,473) (227,507) Restriction to actuarial assets due to recovery limitation 224,561 158,163 Liabilities (Assets), net (91,912) (69,344) Liabilities 7,982 41,937 Assets (99,894) (111,281) Net (assets) recognized in the balance sheet (91,912) (69,344) The movement in the present value of the defined benefit obligation during 2018 is as follows: 12/31/2018 12/31/2017 Present value of obligations at the beginning of the year 3,077,849 2,872,442 Cost of service 1,169 1,285 Interest cost 304,132 322,359 Benefits paid (280,493) (284,777) Actuarial loss/(gain) (15,224) 166,540 Present value of obligations at the end of the year 3,087,433 3,077,849 The movement in the fair value of the plan assets during 2018 is as follows: 12/31/2018 12/31/2017 Fair value of plan assets at the beginning of the year (3,305,356) (3,193,493) Interest income (327,830) (360,013) Benefits Paid 280,493 284,777 Return on plan assets (less interest income) (51,213) (36,627) Fair value of plan assets at the end of the year (3,403,906) (3,305,356) The amounts recognized in the income statement for the year ended December 31, 2018, 2017 and 2016 are comprised as follows: 12/31/2018 12/31/2017 12/31/2016 Cost of current service 1,169 1,285 1,244 Interest cost 304,132 322,359 311,361 Expected return on plan assets (327,830) (360,013) (345,521) Interest on the asset ceiling effect 16,340 26,843 22,189 (6,189) (9,526) (10,727) Total unrecognized costs (income) (*) - 6 7 Total costs / (income) recognized in the income statement (6,189) (9,532) (10,734) Total costs / (income), net (*) (6,189) (9.526) (10,727) (*) Effect of the limit of paragraph 58 (b) of IAS19 - Employee Benefits. The cost/(income) is recognized in the income statement in other operating expenses. The movement in the actuarial gains and losses in 2018, 2017 and 2016 are as follows: 12/31/2018 12/31/2017 12/31/2016 Actuarial losses and (gains) (15,224) 166,540 393,743 Return on plan assets (less interest income) (51,213) (36,627) (427,523) Change in the asset’s limit (excluding interest income) 50,058 (97,882) 41,796 (16,379) 32,031 8,016 Actuarial losses and (gains) recognized in other comprehensive income (16,379) 32,037 8,023 Unrecognized actuarial (gains) - (6) (7) Total cost of actuarial losses and (gains) (*) (16,379) 32,031 8,016 (*) Actuarial (gain)/ loss results from the fluctuation in the investments comprised in the CBS’s asset portfolio. Breakdown of actuarial gains or losses, according paragraph 141 of IAS19: 12/31/2018 Loss due to change in demographic assumptions (139,813) Loss due to change in financial assumptions 46,917 Loss due to experience adjustments 77,672 Return on plan assets (less interest income) (51,213) Change in asset limit (excluding interest income) 50,058 Actuarial losses and (gains) (16.379) The main actuarial assumptions used were as follows: 12/31/2018 12/31/2017 Actuarial financing method Projected unit credit Projected unit credit Functional currency Real (R$) Real (R$) Recognition of plan assets Fair value Fair value Nominal discount rate Millennium Plan: 9.69% 35%: 9.60% Supplementation: 9.59% Millennium Plan: 10.42% 35%: 10.30% Supplementation: 10.32% Inflation rate 4.75% 5.00% Nominal salary increase rate 5.80% 6.05% Nominal benefit increase rate 4.75% 5.00% Rate of return on investments Millennium Plan: 9.69% Millennium Plan: 10.42% Plan 35%: 9.60% Supplementation: 9.59% Plan 35%: 10.30% Supplementation: 10.32% General mortality table Millennium Plan: AT-2000 smoothed down by 10% segregated by gender. Plans 35%: AT-2000 Male aggravated by 15%. Supplementation: AT-2000 aggravated by 10% segregated by gender. Millennium Plan, Plans 35% and Supplementation of Average Salary: AT 2000 segregated by gender (10% smoothed) Disability table 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement) 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement) Disability mortality table Winklevoss - 1% Winklevoss - 1% Turnover table Millenium plan 5% per annum, zero for plans 35% and Supplementation. Millenium plan 5% per annum, zero for plans 35% and Supplementation. Retirement age 100% on the first date he/she becomes eligible for programmed retirement benefit under the plan 100% on the first date he/she becomes eligible for programmed retirement benefit under the plan Household composition of active participants 95% will be married at the time of retirement, with the wife being 4 years younger than the husband 95% will be married at the time of retirement, with the wife being 4 years younger than the husband The assumptions related to the mortality table are based on published statistics and mortality tables. These tables represent an average life expectancy in years of employees who retire at the age of 65, as shown below: Plan covering 35% of the average salary Average salary supplementation plan Mixed supplementary benefit plan (Milênio Plan) 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Longevity at age of 65 for current participants Male 18.00 21.00 18.74 20.45 21.00 21.00 Female 18.00 23.00 22.23 23.02 23.00 23.00 Longevity at age of 65 for current participants who are 40 Male 40.00 43.00 40.60 42.69 43.00 43.00 Female 40.00 47.00 45.37 46.29 47.00 47.00 Allocation of plan assets: 12/31/2018 12/31/2017 Variable income 141,705 4,16% 50,966 1,54% Fixed income 3,050,099 89,61% 3,085,783 93,36% Real estate 52,091 1,53% 44,083 1,33% Others 160,011 4,70% 124,524 3,77% Total 3,403,906 100,00% 3,305,356 100,00% Variable-income assets comprise mainly CSN shares. Fixed-income assets comprise mostly debentures, Interbank Deposit Certificates (“CDI”) and National Treasury Notes (“NTN-B”). Real estate refers to buildings appraised by a specialized asset appraisal firm. There are no assets in use by CSN and its subsidiaries. For the pension plan, the expense as of December 31, 2018 was R$40,199 (R$41,544 and R$ 35,798 as of December 31, 2017 and 2016, respectively). 27.d) Expected contributions No contributions are expected to be paid to the defined benefit plans in 2018. For the mixed supplementary benefit plan, contributions in the amount of R$24,923 are forecasted to be paid in 2018 for the portion of defined contribution and R$1,987 for the portion of defined benefit (risk benefit). 27.e) Sensitivity analysis The quantitative sensitivity analysis regarding the significant assumptions for the pension plans as of December 31, 2018 is as follows: 12/31/2018 Plan covering 35% of the average salary Average salary supplementation plan Mixed supplementary benefit plan (Milênio Plan) Assumption: Discount rate Sensitivity level 0.5% -0.5% 0.5% -0.5% 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 409 (458) 1,650 (1,897) (502) 316 Effect on present value of obligations (13,281) 15,342 (70,755) 76,222 (50,666) 54,396 Assumption: Salary growth Sensitivity level 0.5% -0.5% 0.5% -0.5% 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 252 (223) Effect on present value of obligations 2,028 (1,792) Assumption: Benefit adjustment Sensitivity level 0.5% -0.5% 0.5% -0.5% 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 1,439 (1,350) 7,578 (7,079) 5,720 (5,232) Effect on present value of obligations 14,685 (13,778) 79,305 (74,101) 57,166 (52,366) Assumption: Mortality table Sensitivity level 1.0% -1.0% 1.0% -1.0% 1.0% -1.0% Effect on current service cost and on interest on actuarial obligations (1,052) 1,054 (4,877) 4,845 (1,120) 1,128 Effect on present value of obligations (10,680) 10,706 (50,807) 50,468 (12,179) 12,165 The forecast benefit payments of the defined benefit plans for future years are as follows: Payments 2018 Year 1 244,606 Year 2 252,778 Year 3 269,332 Year 4 265,261 Year 5 271,570 Next 5 years 1,436,738 Total forecast payments 2,740,285 27.f) Post-employment health care plan Refers to a healthcare plan created on December 1, 1996 exclusively for former retired employees, pensioners, those who received an amnesty, war veterans, widows of employees who died as a result of on-the-job accidents and former employees who retired on or before March 20, 1997 and their dependents. Since then, the healthcare plan does not allow the inclusion of new beneficiaries. The plan is sponsored by CSN. The amounts recognized in the balance sheet were determined as follows: 12/31/2018 12/31/2017 Present value of obligations 897,137 866,784 Liabilities 897,137 866,784 The reconciliation of the healthcare liabilities is as follows: 12/31/2018 12/31/2017 Actuarial liability at the beginning of the year 866,784 691,262 Expenses recognized in income for the year 85,748 77,269 Sponsor's contributions transferred in prior year (71,632) (72,192) Recognition of actuarial loss/ (gain) 16,237 170,445 Actuarial liability at the end of the year 897,137 866,784 The actuarial gains and losses recognized in shareholders' equity are as follows: 12/31/2018 12/31/2017 12/31/2016 Actuarial gain /(loss) on obligation 16,237 170,445 210,257 Gain/(loss) recognized in shareholders' equity 16,237 170,445 210,257 The weighted average life expectancy based on the mortality table used to determined actuarial obligations is as follows: 12/31/2018 12/31/2017 Longevity at age of 65 for current participants Male 19.55 19.55 Female 22.17 22.17 Longevity at age of 65 for current participants who are 40 Male 41.59 41.59 Female 45.30 45.30 The actuarial assumptions used for calculating post-employment healthcare were: 12/31/2018 12/31/2017 Biometric and Demographic General mortality table AT 2000 segregated by gender AT 2000 segregated by gender Financial Actuarial nominal discount rate 9.62% 10.34% Inflation 4.75% 5.00% Real increase in medical costs based on age (Aging Factor) 0.5% - 3.00% real a.a. 0.5% - 3.00% real a.a. Nominal increase medical costs growth rate 8.15% 8.41% Average medical cost (Claim cost) 1,054.65 1,001.69 27.g) Sensitivity analysis The quantitative sensitivity analysis regarding the significant assumptions for the post-employment healthcare plans as of December 31, 2018 is as follows: 12/31/2018 Healthcare Plan Assumption: Discount rate Sensitivity level 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 909 (992) Effect on present value of obligations (35,530) 38,727 Assumption: Medical Inflation Sensitivity level 1.0% -1.0% Effect on current service cost and on interest on actuarial obligations 8,091 (6,925) Effect on present value of obligations 84,560 (72,369) Assumption: Mortality table Sensitivity level 1.0% -1.0% Effect on current service cost and on interest on actuarial obligations (2,161) 2,148 Effect on present value of obligations (22,582) 22,451 The forecast benefit payments of the postemployment healthcare plans for future years are as follows: Forecast benefit payments 2018 Year 1 78,100 Year 2 80,787 Year 3 83,232 Year 4 85,386 Year 5 87,224 Next 5 years 450,767 Total forecast payments 865,496

28. COMMITMENTS

28. COMMITMENTS	12 Months Ended
	Dec. 31, 2018
Commitments
COMMITMENTS	28.a) Take-or-pay contracts As of December 31, 2018 and 2017, the Company was a party to take-or-pay contracts as shown in the following table: Payments in the period Type of service 2017 2018 2019 2020 2021 After 2021 Total Transportation of iron ore, coal, coke, steel products, cement and mining products. 957,373 406,920 1,024,674 962,399 831,166 3,761,232 6,579,471 Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets, coal and clinquer. 563,743 658,166 453,801 40,780 8,419 503,000 Processing of furnace sludge and slag resulting from the production process of pig iron and steel. 8,880 9,467 7,074 7,074 7,074 8,842 30,064 Manufacturing, repair, recovery and production of ingot casting machine units. 52,103 21,533 7,968 3,246 3,246 5,952 20,412 1,582,099 1,096,086 1,493,517 1,013,499 849,905 3,776,026 7,132,947 28.b) Concession agreements Minimum future payments related to government concessions as of December 31, 2018 fall due according to the schedule set out in the following table: Company / Concession Type of service 2019 2020 2021 After 2021 Total FTL (Ferrovia Transnordestina Logística) 30 - year concession granted on December 31,1997, renewable for another 30 years, to develop public service and operating the railway system in northeastern Brazil.The northeastern railway system covers 4.238 Kilometers of railway network and operates in Maranhão, Piauí, Ceará, Paraíba, Pernambuco, Alagoas and Rio Grande do Norte. 9,396 9,396 9,396 50,895 79,083 CSN Mineração S.A. Concession to operate the TECAR a solid bulk terminal, one of the four terminals that make up the Port of Itaguai, located in Rio de Janeiro. The concession was renewed and the agreement expires in 2047. 133,021 133,021 133,021 3,458,541 3,857,604 Tecon 25-year concession started in July 2001. On May 10, 2017, was approved the Decree nº 9,048, which changes de concession extension period for port operations. It was established that the requested extension period, added to the initial period, cannot exceed 70 years 33,779 35,176 36,638 175,053 280,646 176,196 177,593 179,055 3,684,489 4,217,333 28.c) Projects and other commitments · Transnordestina project The Transnordestina project which corresponds to rail network II of the Northeast Railway System, includes building 1,753 km of new, next-generation, wide-gauge tracks. The project posts an evolution of 52% progress which was expected to completion for 2017, completion period currently under discussion with the responsible agencies. The Company expects that the investments will permit Transnordestina Logística S.A., the concessionaire that holds the Transnordestina project, to transport of several products, such as iron ore, limestone, soy, cotton, sugarcane, fertilizers, oil, and fuel. The concession will expire in 2057, and can be terminated before this date if the minimum return agreed with the Government is reached. Transnordestina has already obtained the required environmental permits, purchased part of the equipment, contracted some of the services, and in certain regions the project is at an advanced implementation stage. The sources of financing for the project are: (i) financing granted by Banco do Nordeste/ FNE and the BNDES, (ii) debentures issued by FDNE, (iii) Permanent Track Use contracts, and (iv) contribution of capital by CSN and public shareholders. The approved construction investment is R$7,542,000 and the balance of disbursable funds will be adjusted using the IPCA as from April 2012. Should additional funds be required, they will be provided by CSN and/or third parties under Permanent Track Use contracts. The budget to conclude the project is under review. Currently, the budget value is composed as follows: Missão Velha-Salgueiro: R$0.4 billion, Salgueiro-Trindade: R$0.7 billion, Trindade-Eliseu Martins: R$2.4 billion, Missão Velha-Porto de Pecém: R$3 billion, Salgueiro-Porto de Suape: R$4.7 billion, amounting R$ 11.2 billion. The Company guarantees 100% of TLSA’s financing granted by Banco do Nordeste/FNE and the BNDES, and 50.97% of the debentures issued by FDNE (includes the corporate guarantee of 48.47%, a collateral letter of 1.25% issued to BNB and the corporate guarantee of 1.25% pledged to BNB). Under the FDNE charter, approved by Federal Decree nº 6,952/2009, and the Investment Agreement entered into with the public shareholders/ financiers, up to 50% of the debentures maybe converted into TLSA shares. The Court of Auditors of the Union - TCU through a protective order issued in May 2016, regarding the case TC 012.179/2016, suspended new transfers of public resources to TLSA from Valec Engenharia, Construções e Ferrovias S.A., Fundo de Investimento do Nordeste – FINOR, Fundo Constitucional de Financiamento do Nordeste – FNE, Fundo de Desenvolvimento do Nordeste – FDNE, Banco Nacional de Desenvolvimento Econômico e Social – BNDES and BNDES Participações S.A.– BNDESPar. After filing an appeal against the protective order and providing the necessary explanations, in June 2016 the order issued by TCU was withdrawn unanimously by the members of this court, with the continuity of investments planned having been restored. By means of another protective order issued in January 2017, relating to the case TC 012.179/2016, the Court of Auditors of the Union suspended new transfers of public resources to TLSA by Valec Engenharia, Construções e Ferrovias S.A., Fundo de Investimento do Nordeste – FINOR, Fundo Constitucional de Financiamento do Nordeste – FNE, Fundo de Desenvolvimento do Nordeste – FDNE, Banco Nacional de Desenvolvimento Econômico e Social – BNDES and BNDES Participações S.A.– BNDESPar. The Company has provided the required clarifications to the TCU and has acted firmly in order that the decision can be repealed soon and the flow of investments planned can be restored. Despite of, ANTT, through Letter 20/2019 / GPFER / SUFER, dated January 21, 2019 and received by TLSA on February 1, 2019, informed the receipt of the review the executive projects of lots 7, 8 and 11 of the MVP section, however, disregarded the review of the projects for extemporaneous. The review of executive projects is essential for the completion of the regulatory budget, and the conclusion of this regulatory budget is a requirement for the TCU to reassess the blocking order of public funding. There is an administrative procedure with the ANTT (National Land Transportation Agency) which evaluates the regular compliance with the obligations of the Concession Agreement corresponding to System II by Concessionaire TLSA. ANTT’s technical area, in a unilateral opinion, understood that non-compliance with the contractual obligations by the Concessionaire is evidenced. The technical area’s opinion is under evaluation and, if the irregularity is proven, ANTT may open new process to apply the applicable penalties, among them, forfeiture. The procedure is in fact finding phase and until the moment there is no final decision on the merit. · FTL – Ferrovia Transnordestina Logística S.A. (Operational rail network) In relation to the rail network I, operates by Ferrovia Transnordestina Logística S.A.(“FTL”) - there is an administrative procedure before the National Agency for Land Transportation (“ANTT”) that analyzes the regular fulfillment of the obligations of the Concession Agreement by the Concessionaire FTL. In view of a unilateral analysis, ANTT informed that FTL would have failed to comply with the TAC (Conduct Adjustment Agreement) signed in 2013 as a result of the non-compliance with the production target for 2013. ANTT decided to file an administrative proceeding to investigate the non-compliance with the concession agreement and, if the irregularity is proved, it can apply the related penalties or recommend the declaration of obsolescence, and the proceeding is at the finding-of-facts stage and, so far, there is no final decision on the merit.

29. INSURANCE

29. INSURANCE	12 Months Ended
	Dec. 31, 2018
Insurance
INSURANCE	Aiming to properly mitigate risk and in view of the nature of its operations, the Company and its subsidiaries have taken out several different types of insurance policies. Such policies are contracted in line with the CSN Risk Management policy and are similar to the insurance taken out by other companies operating in the same lines of business as CSN and its subsidiaries. The risks covered under such policies include the following: Domestic Transportation, International Transportation, Life and Casualty, Health Coverage, Fleet Vehicles, D&O (Civil Liability Insurance for Directors and Officers), General Civil Liability, Engineering Risks, naming Risks, Export Credit, warranty and Port Operator’s Civil Liability. In 2017, after negotiation with insurers and reinsurers in Brazil and abroad, an insurance policy was issued for the contracting of a policy of Operational Risk of Property Damages and Loss of Profits, with effect from September 30, 2017 to March 31, 2019. Under the insurance policy, the maximum limit of indemnity is US$600 million and deductibles in the amount of US$385 million for material damages and 45 days for loss of profits and covers the following Company’s units and subsidiaries: Presidente Vargas Steelworks, CSN Mineração and Sepetiba Tecon. Management understands that the policies covers its assets and the risks to which the Company is subject. In view of their nature, the risk assumptions adopted are not part of the scope of an audit of the financial statements and, accordingly, were not audited by our independent auditors.

30. ADDITIONAL INFORMATION TO C

30. ADDITIONAL INFORMATION TO CASH FLOWS	12 Months Ended
	Dec. 31, 2018
Additional Information To Cash Flows
ADDITIONAL INFORMATION TO CASH FLOWS	The following table provides additional information on transactions related to the statement of cash flows: Consolidated 12/31/2018 12/31/2017 12/31/2016 Income tax and social contribution paid 336,962 268,847 456,227 Addition to PP&E with interest capitalization (note 10 and 25) 71,611 91,957 215,794 Acquisition of fixed assets through loans 10,792 4,265 7,437 Non-monetary transaction with joint venture 20,264 419,365 385,333 679,458

31. EVENTS AFTER THE REPORTING

31. EVENTS AFTER THE REPORTING PERIOD	12 Months Ended
	Dec. 31, 2018
Events After Reporting Period
EVENTS AFTER THE REPORTING PERIOD	Debentures · Tenth issue In December 2018, the Company authorized the issuance of 2,000 debentures, in a single series, with collateral and non-convertible debentures, at a par value of R$ 1, with interest of 126.80% p.a of CDI, with final maturity in December of 2023 and with options for early redemption and optional acquisition, with financial settlement completed on February 1, 2019, totaling R$ 1,950,000, equivalent to 1,950 debentures effectively subscribed. The proceeds were allocated to (i) the total liquidation and partial amortization of certain Bank Credit Notes entered into with Caixa Econômica Federal (CEF) and (ii) the ordinary management of the Company's business. · Prepayment agreement – Sale of iron ore In February 20, 2019, the Company has concluded negotiations for the supply of iron ore to Swiss trader Glencore International AG (“Glencore”). The transaction involves a prepayment to CSN Mineração in the amount of US$ 500,000,000.00 related to an iron ore supply contract of approximately 22 million tons over 5 years. After certain precedent conditions have been met, the disbursement occurred on March 29, 2019. · Loan agreement In addition, a loan agreement has been entered into on 15 February 2019 with the Commerzbank Aktiengesellschaft for an amount of EUR 70 million, replacing the current loan agreement.

2. SUMMARY OF SIGNIFICANT ACC_2

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies Policies Abstract
Basis of preparation and declaration of conformity	The consolidated financial statements have been prepared and are being presented in accordance with International Financial Reporting Standards (“IFRS”) issued by the International Accounting Standards Board (IASB) and includes all of the relevant information of the financial statements. The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates. It also requires management to exercise its judgment in the process of applying the Company’s accounting policies. It is disclosed in the notes to this report all subjects involving a high degree of judgment or complexity, or when assumptions and estimates are significant to the consolidated financial statements, those subjects are related to the allowance for doubtful debts, provision for inventory losses, provision for labor, civil, tax, environmental and social security contingences, depreciation, amortization, depletion, provision for impairment, deferred taxes, financial instruments and employee benefits. Actual results may differ from these estimates. The financial statements are presented in thousands of Brazilian reais (R$). Depending on the applicable IFRS standard, the measurement criteria used in preparing the financial statements considers the historical cost, net realizable value, fair value or recoverable amount. When the IFRS allows us and option between acquisition cost and other measurement criteria, the acquisition cost was the criteria used. The consolidated financial statements were approved by the Board of Directors on April 4, 2019.
Consolidated financial statements	The accounting policies have been consistently applied to all consolidated companies. The consolidated financial statements for the years ended December 31, 2018 and 2017 include the following direct and indirect subsidiaries, joint ventures and joint operations, as well as the exclusive funds, as follows: Equity interests (%) Companies 12/31/2018 12/31/2017 Core business Direct interest in subsidiaries: full consolidation CSN Islands VII Corp. 100.00 100.00 Financial transactions CSN Islands XI Corp. 100.00 100.00 Financial transactions CSN Islands XII Corp. 100.00 100.00 Financial transactions CSN Minerals S.L.U. (1) 100.00 Equity interests CSN Export Europe, S.L.U. (1) 100.00 Financial transactions and Equity interests CSN Metals S.L.U. (1) 100.00 Equity interests and Financial transactions CSN Americas S.L.U. (1) 100.00 Equity interests and Financial transactions CSN Steel S.L.U. 100.00 100.00 Equity interests and Financial transactions TdBB S.A (*) 100.00 100.00 Equity interests Sepetiba Tecon S.A. 99.99 99.99 Port services Minérios Nacional S.A. 99.99 99.99 Mining and Equity interests Companhia Florestal do Brasil 99.99 99.99 Reforestation Estanho de Rondônia S.A. 99.99 99.99 Tin Mining Companhia Metalúrgica Prada 99.99 99.99 Manufacture of containers and distribution of steel products CSN Gestão de Recursos Financeiros Ltda. (*) 99.99 99.99 Management of funds and securities portfolio CSN Mineração S.A. 87.52 87.52 Mining and Equity interests CSN Energia S.A. 99.99 99.99 Sale of electric power FTL - Ferrovia Transnordestina Logística S.A. 91.69 90.78 Railroad logistics Nordeste Logística S.A. 99.99 99.99 Port services Aceros México CSN (2) 0.08 Commercial representation, sales of steel and related activities CSN Inova Ltd.(3) 100.00 Advisory and implementation of new development projects Indirect interest in subsidiaries: full consolidation Companhia Siderúrgica Nacional (4) 100.00 Steel Lusosider Projectos Siderúrgicos S.A. 100.00 99.94 Equity interests and product sales Lusosider Aços Planos, S. A. 99.99 99.99 Steel and Equity interests CSN Resources S.A. 100.00 100.00 Financial transactions and Equity interests Companhia Brasileira de Latas 99.00 99.99 Sale of cans and containers in general and Equity interests Companhia de Embalagens Metálicas - MMSA 99.67 99.67 Production and sale of cans and related activities Companhia de Embalagens Metálicas - MTM 99.67 99.67 Production and sale of cans and related activities CSN Steel Holdings 1, S.L.U. 100.00 100.00 Financial transactions, product sales and Equity interests CSN Productos Siderúrgicos S.L. 100.00 100.00 Financial transactions, product sales and Equity interests Stalhwerk Thüringen GmbH 100.00 100.00 Production and sale of long steel and related activities CSN Steel Sections UK Limited (*) 100.00 100.00 Sale of long steel CSN Steel Sections Polska Sp.Z.o.o 100.00 100.00 Financial transactions, product sales and Equity interests CSN Asia Limited 100.00 100.00 Commercial representation CSN Mining Holding, S.L 87.52 87.52 Financial transactions, product sales and Equity interests CSN Mining GmbH 87.52 87.52 Financial transactions, product sales and Equity interests CSN Mining Asia Limited 87.52 87.52 Commercial representation Aceros México CSN (2) 99.92 100.00 Commercial representation, sale of steel and related activities Lusosider Ibérica S.A 100.00 99.94 Steel, commercial and industrial activities and equity interests CSN Mining Portugal, Unipessoal Lda. 87.52 87.52 Commercial and representation of products Companhia Siderúrgica Nacional, LLC (4) 100.00 Import and distribution/resale of products Direct interest in joint operations Itá Energética S.A. 48.75 48.75 Electric power generation Consórcio da Usina Hidrelétrica de Igarapava 17.92 17.92 Electric power consortium Direct interest in joint ventures MRS Logística S.A. 18.64 18.64 Railroad transportation Aceros Del Orinoco S.A. 31.82 31.82 Dormant company CBSI - Companhia Brasileira de Serviços de Infraestrutura 50.00 50.00 Equity interests and product sales and iron ore Transnordestina Logística S.A. 46.30 46.30 Railroad logistics Indirect interest in joint ventures MRS Logística S.A. 16.30 16.30 Railroad transportation Direct interest in associates Arvedi Metalfer do Brasil S.A. 20.00 20.00 Metallurgy and Equity interests (*) They are Dormant Companies therefore they do not appear in the note 9.a, where is disclosed business information under the equity method and fair value through profit or loss and comprehensive income. · Events in 2018: (1) On February 6, 2018, the Spanish commercial registry recognized the merger by absorption of the companies by CSN Steel, S.L.U., the date from which the companies were considered legally extinct, before third parties and for the purposes of commercial law, the merger is retroactive to the date of December 28, 2017; (2) Transfer of 1% stake in Aceros Mexico CSN from CSN Steel to Companhia Siderúrgica Nacional occurred on February 1, 2018. On September 18, 2018, CSN Steel increased the capital of Aceros Mexico CSN, diluting the direct interest of Companhia Siderúrgica Nacional to 0.08%, with CSN Steel holding 99.92%. On February 1, 2019, the Federal Taxpayers' Registry was canceled and, therefore, the settlement process of Aceros Mexico CSN was terminated, however, before third parties and for the purposes of commercial law, the settlement was retroactive to September 18, 2018; (3) Company incorporated in 2018. (4) On June 5, 2018 CSN LLC had its corporate name changed to "Heartland Steel Processing, LLC". On the same date, a new company was incorporated under the name "Companhia Siderúrgica Nacional, LLC", a wholly owned subsidiary of Heartland Steel Processing, LLC. On June 28, 2018, Companhia Siderúrgica Nacional, LLC., became a wholly-owned subsidiary of CSN Steel and, on June 29, 2018, Heartland Steel Processing, LLC was sold to Steel Dynamics, Inc. The remaining assets are registered at Companhia Siderúrgica Nacional, LLC, a subsidiary of CSN Steel (see note 3). · Exclusive funds Equity interests (%) Exclusive funds 12/31/2018 12/31/2017 Core business Direct interest: full consolidation Diplic II - Private credit balanced mutual fund 100.00 100.00 Investment fund Caixa Vértice - Private credit balanced mutual fund 100.00 100.00 Investment fund VR1 - Private credit balanced mutual fund 100.00 100.00 Investment fund In preparing the consolidated financial statements, we have adopted the following consolidation procedures: · Transactions between subsidiaries, associates, joint ventures and joint operations Unrealized gains on transactions with subsidiaries, joint ventures and associates are eliminated to the extent of CSN’s equity interests in the related entity by the consolidation process. Unrealized losses are eliminated in the same manner as unrealized gains, although only to the extent that there are not indications of impairment. The Company eliminates the effect on profit or loss of transactions carried out with joint ventures and, as a result, reclassifies part of the equity in results of joint ventures to financial expenses, cost of sales and income tax and social contribution. The base date to the financial statements of the subsidiaries and joint ventures is the same as of the Company, and their accounting policies are also in line with the policies adopted by the CSN. Subsidiaries Subsidiaries are all entities (including special purpose entities) which financial and operating policies can be conducted by the Company and when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to use its power to affect its returns. The existence and effect of potential voting rights that are actually exercisable or convertible are taken into consideration when assessing whether the Company controls another entity. Subsidiaries are fully consolidated from the date when the control is transferred to the Company and are deconsolidated from the date when such control ceases. Joint ventures and joint operations Joint arrangements are all entities over which the Company has joint control with one or more other parties. The investments in joint arrangements are classified as joint operations or joint ventures depending on the contractual rights and obligations of each investor. Joint operations are accounted for in the financial statements in order to represent the Company's contractual rights and obligations. Therefore, the assets, liabilities, revenues and expenses related to its interests in joint operations are accounted for individually in the financial statements. Joint ventures are accounted for under the equity method and are not consolidated. The Company eliminates the effect on profit or loss of transactions carried out with joint ventures and, as a result, eliminates part of the equity in results of joint ventures to financial expenses, cost of sales, net sales and income tax and social contribution. Associates Associates are all entities over which the Company has significant influence but not control, generally through a shareholding percentage from 20% up to 50% of the voting rights. Investments in associates are accounted for under the equity method and are initially recognized at cost. · Transactions and non-controlling interests The Company treats transactions with non-controlling interests as transactions with owners of the Company. For purchases from non-controlling interests, the difference between any consideration paid and the relevant share acquired of the carrying value of subsidiary net assets is recorded in shareholders' equity. Gains and losses on disposals to non-controlling interests are also recognized directly in shareholders' equity. When the Company no longer holds control, any retained interest in the entity is remeasured to its fair value, with the change in the carrying amount recognized in profit or loss. The fair value is the initial carrying amount for the purposes of subsequently accounting for the retained interest in an associate, joint venture or financial asset. In addition, any amounts previously recognized in other comprehensive income in respect of that entity are accounted for as if the Company had disposed of the related assets or liabilities. This may mean that amounts previously recognized in other comprehensive income are reclassified to profit or loss.
Foreign currencies	i. Functional and presentation currency Items included in the financial statements are related to each one of the Company's subsidiaries are measured using the currency of the primary economic environment in which the subsidiary operates (“functional currency”). The consolidated financial statements are presented in Brazilian reais (R$), which is the Company’s functional currency and the Group’s presentation currency. ii. Transactions and balances According to IAS 21 – The effects of changes in foreign exchange rates, transactions in foreign currencies are translated into the functional currency using the exchange rates in effect at the dates of the transactions or valuations when their values are remeasured. Foreign exchange gains and losses resulting from the settlement of those transactions and from the translation at exchange rates in effect as of December 31, 2018 related to monetary assets and liabilities denominated in foreign currencies are recognized in the income statement, except when they are recognized in shareholders' equity as a result of foreign operation characterized as foreign investment. According to IAS 21 and IFRIC 22 – foreign currency transactions and advance consideration, the transactions in which the Company recognizes a non-monetary asset or non-monetary liability involving prepayments or receipts in foreign currency are recorded at the exchange rate of the date the entity initially recognized (transaction date) the non-monetary asset or non-current liability monetary. The balances of assets and liabilities are translated by exchange rates prevailing at the end of the reporting period. As of December 31, 2018, US$1 is equal to R$3.8748 (R$3.3080 at December 31, 2017) and €1 is equal to R$4.4390 (R$3.9693 at December 31, 2017), according to the rates obtained from Central Bank of Brazil website. All other foreign exchange gains and losses, including foreign exchange gains and losses related to borrowings and cash and cash equivalents, are presented in the income statement as financial income or expenses. iii. Group companies The results and financial position of all the Group’s entities (none of which has the currency of a hyper-inflationary economy) that have a functional currency different from the presentation currency are translated into the presentation currency as follows: · The assets and liabilities of each balance sheet presented are translated by exchange rate at the end of the reporting period; · The income and expenses of each income statement are translated at average exchange rates (unless this average is not a reasonable approximation of the cumulative effect of the rates at the transaction dates, in which case income and expenses are translated at the rate in effect at the transaction dates); · All resulting exchange differences are recognized as a separate component in other comprehensive income; and · Gains and losses accumulated in shareholders' equity are included in the income statement when the foreign operation is partially disposed or sold.
Cash and cash equivalents	Cash and cash equivalents include cash on hand, in bank accounts and other short-term highly liquid investments redeemable within 90 days from the end of the reporting period, readily convertible into a known amount of cash and subject to an insignificant risk of change in value. Bank certificates of deposit and government securities that do not meet the above criteria are not considered cash equivalents and are classified as financial investments, according to note 5.
Trade receivables	Trade receivables are initially recognized at fair value, including the related taxes and expenses, being foreign currency-denominated trade receivables are adjusted at the exchange rate in effect at the end of the reporting period. The accounts receivable with a receipt period of more than 90 days are subject to a present value adjustment and analysis regarding the operation. With the adoption of the new IFRS 9 - Financial instruments, the Company started to apply the new model of expected losses, where it considers all possible loss events over the life of its receivables. These expected credit losses are estimated according to the loss rate by maturity range adopted by the Company since the initial (recognition) date of the asset. The Company considers customer history, default rate, financial situation and the position of its legal advisors to estimate the expected credit losses.
Inventories	Inventories are carried at the lower of cost and net realizable value. Cost is determined using the weighted average cost method on the acquisition of raw materials. The costs of finished goods and work in process comprise raw materials, labor and other direct costs (based on the normal production capacity). Net realizable value represents the estimated selling price in the normal course of business, less estimated costs of completion and costs necessary to make the sale. The allowance for estimated losses on slow-moving or obsolete inventories are recognized when considered necessary. Stockpiled ore inventories are accounted for as processed when removed from the mine. The cost of finished goods comprises all direct costs necessary to transform stockpiled inventories into finished goods.
Investments	Investments in subsidiaries, joint ventures and associates are accounted for under the equity method of accounting and are initially recognized at cost. The gains or losses are recognized in profit or loss as operating income (or expenses). In the case of foreign exchange differences arising on translating foreign investments that have a functional currency different from the Company’s, changes in investments due exclusively to foreign exchange differences, as well as adjustments to pension plans and investments that impact the subsidiaries’ shareholders' equity, are recognized in line item “Cumulative translation adjustments”, in the Company’s shareholders' equity, and are only recognized in profit or loss when the investment is disposed or written off due to impairment loss. Other investments are recognized at cost or fair value. When necessary, the accounting policies of subsidiaries, joint ventures and associates are changed to ensure consistency with the policies adopted by the Company.
Business combination	The acquisition method is used to account for on each business combination conducted by the Company. The consideration transferred by acquiring an entity is measured by the fair value of the assets transferred, liabilities incurred, and equity instruments issued by the Company. The consideration transferred includes the fair value of any asset or liability resulting from a contingent consideration arrangement, where applicable. Acquisition-related costs are recognized in profit or loss for the year, as incurred. Identifiable assets acquired, and liabilities assumed in a business combination are initially measured at their fair values at the acquisition date.
Property, plant and equipment	Property, plant and equipment are carried at cost of acquisition, formation or construction, less accumulated depreciation or depletion and any impairment loss. Depreciation is calculated under the straight-line method based on the remaining economic useful economic lives of assets, as mentioned in note 10. The depletion of mines is calculated based on the quantity of ore mined. Land is not depreciated since their useful life is considered indefinite. However, if the tangible assets are mine-specific, that is, used in the mining activity, they are depreciated over the shorter between the normal useful lives of such assets and the useful life of the mine. The Company recognizes in the carrying amount of property, plant and equipment the cost of replacement, and consequently reducing the carrying amount of the part that is replaced if it is probable that future economic benefits embodied therein will revert to the Company, and if the cost of the asset can be reliably measured. All other disbursements are expensed as incurred. Borrowing costs related to funds obtained for construction in progress are capitalized until these projects are completed. If some components of property, plant and equipment have different useful lives, these components are accounted for in separate line items of property, plant and equipment. Gains and losses on disposal are determined by comparing the sale value less the residual value and are recognized in ‘Other operating income (expenses)’. Exploration expenditures are recognized as expenses until the viability of mining activities is established; after this period the subsequent development costs are capitalized. Exploration and valuation expenditures include: · Research and analysis of historical data related to area exploration; · Topographic, geological, geochemical and geophysical studies; · Determine the mineral asset’s volume and quality/grade; · Examine and test the extraction processes and methods; · Topographic surveys of transportation and infrastructure needs; · Market and financial studies; The development costs from new mineral deposits or from capacity expansion in mine operations are capitalized and amortized using the produced (extracted) units’ method based on the probable and proven ore quantities. The development stage includes: · Drillings to define the ore body; · Access and draining plans; · Advance removal of overburden (top soil and waste material removed prior to initial mining of the ore body) and waste material (non-economic material that is intermingled with the ore body). Stripping costs (the costs associated with the removal of overburden and other waste materials) incurred during the development of a mine, before production commences, they are capitalized as part of the depreciable cost of developing the property. Such costs are subsequently amortized over the useful life of the mine based on proven and probable reserves. Stripping costs in the production phase are included in the cost of the inventory produced, except when a specific extraction campaign is made to access deeper deposits where ore body is located. In these cases, costs are capitalized and taken to noncurrent assets when the mineral ore deposit is extracted and are amortized over the useful life of the ore body. The Company holds spare parts that will be used to replace parts of property, plant and equipment and that used to increase the asset’s useful life when it exceeds 12 months. These spare parts are classified in property, plant and equipment and not in inventories.
Intangible assets	Intangible assets comprise assets acquired from third parties, including through business combinations. These assets are recognized at cost of acquisition or formation, less amortization calculated on a straight-line basis on the exploration or recovery periods estimated. Mineral rights acquired are classified in line item ‘’other assets’’ in intangible assets. Intangible assets with indefinite useful lives and goodwill based on expected future profitability are not amortized. · Goodwill Goodwill represents the positive difference between the amount paid and/or payable for the acquisition of a business and the net fair values of the acquiree´s assets and liabilities. Goodwill on acquisitions from business combination is recognized as intangible assets in the consolidated financial statements. The gain on purchase is recognized as a gain in profit for the period at the acquisition date. Goodwill is annually tested for impairment. Impairment losses on goodwill are not reversed. Gains and losses on the disposal of a Cash-Generating Unit (CGU) include the carrying amount of goodwill related to the CGU sold. Goodwill is allocated to CGUs for impairment testing purposes. The allocation is made to CGUs or group of CGUs that are expected to benefit from the business combination in which the goodwill arose, and if that unit is not greater than the operating segment. · Software Software licenses purchased are capitalized based on the costs incurred to purchase the software and make it ready for use. These costs are amortized on a straight-line basis over the estimated useful lives in up to 10 years.
Impairment of non-financial assets	Assets with infinite useful lives, such as goodwill, are not subject to amortization and are annually tested for impairment. Assets subject to amortization and/or depreciation, such as property, plant and equipment, are tested for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. An impairment loss is recognized at the amount at which the carrying amount of the asset exceeds its recoverable amount. The recoverable amount is the higher of the fair value of an asset less costs to sell and its value in use. For impairment testing purposes, assets are grouped at their lowest levels for which there are separately identifiable cash flows (Cash Generating Units, or CGUs). Non-financial assets, except for goodwill, are subsequently reviewed for possible reversal of the impairment at the reporting date.
Employee benefits	i. Employee benefits Defined contribution plans A defined contribution plan is as a post-employment benefit plan whereby an entity pays fixed contributions to a separate entity (pension fund) and will not have any legal or constructive obligation to pay additional amounts. Obligations for contributions to defined contribution pension plans are recognized as employee benefit expenses in the periods during which services are provided by employees. Contributions paid in advance are recognized for an asset since it is agreed that either cash reimbursement or future reduction on payables will flow back to CSN. Contributions to a defined contribution plan that is expected to mature twelve (12) months after the end of the period in which the employee provides services are discounted to their present values. Defined benefit plans A defined benefit plan is a post-employment benefit plan other than a defined contribution plan. The Company’s net obligation regarding defined pension benefit plans is calculated individually for each plan by estimating the value of the future benefit that the employees accrue as return for services provided in the current period and in prior periods; such benefit is discounted to its present value. The discount rate is the yield presented at the end of the reporting period for top line debt securities whose maturity dates approximate the terms and conditions of the Company’s obligations and which are denominated in the same currency as the one in which it is expected that the benefits will be paid. The calculation is made annually by a qualified actuary using the projected unit credit method. When the calculation results in a benefit for the Company, the asset to be recognized is limited to the total amount of any unrecognized costs of past services and the present value of the economic benefits available in the form of future plan reimbursements or reduction in future contributions to the plan. The present value of economic benefits is calculated taking into account the funding requirements applicable to the Company’s plans. An economic benefit is available to the Company if it is realizable during the life of the plan or upon settlement of the plan’s liabilities. The Company and some of its subsidiaries offered a postretirement healthcare benefit to its employees. The right to these benefits is usually contingent to their remaining in employment until the retirement age and the completion of the minimum length of service. The expected costs of these benefits are accumulated during the employment period, and are calculated using the same accounting method used for defined benefit pension plans. These obligations are annually valued by qualified independent actuaries. When the benefits of a plan are increased, the portion of the increased benefit related to past services of employees is recognized in profit or loss until the benefits become vested. When benefits became vesting rights, all actuarial gains or losses are immediately recognized in profit or loss. The Company recognizes all actuarial gains or losses resulting from defined benefit plans immediately in other comprehensive income. If the plan is extinguished, actuarial gains and losses are recognized in profit or loss. ii. Profit sharing and bonus Employee profit sharing and executives’ variable compensation are linked to the achievement of operating and financial targets. The Company recognizes a liability and an expense substantially allocated to production cost and, where applicable, to general and administrative expenses when such goals are met.
Provisions	Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that the Company will be required to settle the obligation and it has reliable cost estimation. The amount recognized as a provision is the best value estimation required to settle the present obligation at the end of the reporting period, taking into account the risks and uncertainties surrounding the obligation. When a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows (when the effect of the time value of money is material). Success fees are accrued to the extent that they make it probable that disbursements will occur. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, a receivable is recognized as an asset if it is probable that reimbursement will be received and that the amount of the receivable can be measured reliably.
Concessions	The Company has governmental concessions to provide the following types of services: railway and port transportation managed by Company´s subsidiaries and joint-ventures. The concessions included in the consolidated financial statements are related to the rail network in the Northeast area, managed by the subsidiary FTL, the container terminal in Itaguaí, managed by the subsidiary Sepetiba Tecon and the port terminal TECAR for exporting ore and importing coal, which is managed by the subsidiary CSN Mineração. The Company´s concession contracts are not within the scope of IFRIC12 – Service Concession Arrangements, considering that the grantor (refers to the government) has effectively no control over what, to whom and at what price the services will be provided by the dealer (refers to the private part) to the customers. In essence, all concession contracts have operating leasing characteristics. Therefore, the accounting should follow the accounting rules applicable to leases, according IAS 17 - Leases. Our concession agreements provide for the use of a specific asset for an agreed period of time, but without any transfer of ownership to the Company or option to buy these assets after the completion of these contracts. Payments made under operating leases are recognized in the income statement on a straight-line basis over the period of the contracts. There are assets related to our concessions which are subject to reversion to the grantor at the end of the concession agreement. The residual carrying amounts of these assets on December 31, 2018 are listed below with an indication of their classification in our financial statements: Concession Net book value (R$) Classification in balance sheet Sepetiba Tecon S.A. (TECON) 347 million Fixed assets and intangible (Software) Tecar (CSN Mineração) 1,616 million Fixed assets and intangible (Software) FTL - Ferrovia Transnordestina Logística S.A. (FTL) 227 million Fixed assets Transnordestina logística S.A. (TLSA) 8,439 million (1) Investment (1) The amount of fixed and intangible assets is recognized in TLSA’s financial statements. The Company recognizes its interest in the assets under the equity method.
Share capital	Common shares are classified in shareholders' equity. Incremental costs directly attributable to the issue of new shares or options are shown in shareholders' equity as a deduction to the amount received, net of taxes. When any Company of the Group buys Company shares (treasury shares), the amount paid, including any directly additional costs (net of income tax), is deducted from shareholders' equity attributable to owners of the Company until the shares are canceled or sold. When these shares are subsequently sold, any amount received, net of any directly attributable additional transaction costs and the related income tax and social contribution effects, is included in shareholders' equity attributable to owners of the Company.
Revenue recognition	As of January 1, 2018, IFRS 15 was adopted by the Company, all assets are recorded according to the respective practice. Operating revenue from the sale of goods in the normal course of business is measured at the fair value of the consideration that the entity expects to receive in exchange for the delivery of the good or service promised to the client. Revenue recognition occurs when or as the entity satisfies a performance obligation by transferring the good or service to the customer, understanding that performance obligation is an enforceable promise in a contract with a customer for the transfer of a good / service or a series of goods or services. The transfer is considered to be effected when or as the customer obtains control of that asset. If it is probable that discounts will be granted and the value thereof can be reliably measured, then the discount is recognized as a reduction of the operating revenue as sales are recognized. Freight export services under the CFR (Cost and Freight) and CIF (Cost, Insurance and Freight) modalities, where the Company is responsible for the freight service, are considered separate services and therefore a separate obligation, with their allocation apart of the price of the transaction and with recognition of the service over time. Such revenue allocated to freight does not significantly affect the results of the Company's fiscal year and, therefore, it is not presented separately in the financial statements. For other services rendered, revenue is recognized based on its realization over time.
Financial income and financial expenses	Financial income includes interest income from funds invested, dividend income not accounted for under the equity method, changes in the fair value of financial assets measured at fair value through profit or loss, and gains on derivative instruments that are recognized in profit or loss. Interest income is recognized in profit or loss under the effective interest method. Dividend income is recognized in profit or loss when the Company’s right to receive payment has been established. Distributions received from investees accounted for under the equity method reduce the investment value. Financial expenses comprise interest expenses on borrowings, dividends on preferred shares classified as liabilities, losses on the fair value of financial instruments measured at fair value through profit or loss, impairment losses recognized in financial assets, and losses on derivative instruments that are recognized in profit or loss. Borrowing costs that are not directly attributable to the acquisition, construction or production of a qualifying asset are measured through profit or loss under the effective interest method. Foreign exchange gains and losses are reported on a net basis.
Income tax and social contribution	Current income tax and social contribution are calculated based on the tax laws enacted by the end of the reporting period, including in the countries where the Group entities operate and generate taxable profit. Management periodically assesses the positions taken in the tax calculations with respect to situations where applicable tax regulations are open to interpretations. The Group recognizes provisions where appropriate, based on the estimated payments to tax authorities. The income tax and social contribution expense comprises current and deferred taxes. Current and deferred taxes are recognized in profit or loss unless they are related to business combinations or items recognized directly in shareholders' equity. Current tax is the expected tax payable or receivable on taxable profit or loss for the year at tax rates that have been enacted by the end of the reporting period and any adjustment to taxes payable in relation to prior years. Deferred tax is recognized on temporary differences between the carrying amounts of assets and liabilities in the financial statements and the corresponding tax bases used in the computation of taxable profit. Deferred tax is not recognized for the following temporary differences: initial recognition of assets and liabilities in a transaction that is not a business combination and does not affect either the accounting or taxable profit or loss, and differences associated with investments in subsidiaries and joint ventures when it is probable that they will not reverse in the foreseeable future. Moreover, a deferred tax liability is not recognized for taxable temporary differences resulting from the initial recognition of goodwill. The deferred tax is measured at the rates that are expected to be applied on temporary differences when they reverse, based on the laws enacted by the end of the reporting period. Current income tax and social contribution are carried at their net amounts by the taxpayer, in liabilities when there are amounts payable or in assets when prepaid amounts exceed the total amount due at the end of the reporting period. Deferred tax assets and liabilities are offset when there is a legally enforceable right to set off current tax assets against current tax liabilities and when they relate to income taxes levied by the same taxation authority on the same entity subject to taxation. A deferred income tax and social contribution asset is recognized for all tax losses, tax credits, and deductible temporary differences to the extent that it is probable that taxable profits will be available against which those tax losses, tax credits, and deductible temporary differences can be utilized. Annually, the Company reviews and verifies the existence of future taxable income and a provision for loss is recognized when the realization of these credits is not likely.
Earnings/(Loss) per share	Basic earnings/loss per share are calculated by means of the profit/loss for the year attributable to owners of the Group and the weighted average number of common shares outstanding in the related period. Diluted earnings/loss per share are calculated by means of the average number of shares outstanding, adjusted by instruments potentially convertible into shares, with diluting effect, in the reported periods. The Group does not have any instruments potentially convertible into shares and, accordingly, diluted earnings/loss per share are equal to basic earnings/loss per share.
Environmental and restoration costs	The Company recognizes a provision for the recovery costs and fines when a loss is probable and the amounts of the related costs can be reliably measured. Generally, the period when the provision for recovery is recognized coincides with the end of a feasibility study or the commitment to adopt a formal action plan. Expenses related to compliance with environmental regulations are charged to profit or loss or capitalized, as appropriate. Capitalization is considered appropriate when the expenses refer to items that will continue to benefit the Group and that are basically related to the acquisition and installation of equipment to control and/or prevent pollution.
Research and development	Research expenditures are recognized as expenses when incurred. Expenditures on project developments (related to the design and testing stages of new or improved products) are recognized as intangible assets when it is probable that projects will be successful, based on their commercial and technological feasibility, and only when the cost can be reliably measured. When capitalized, development expenditures are amortized from the start of a product commercial production, on a straight-line basis and over the period of the expected benefit.
Financial instruments	As of January 1, 2018, IFRS 9 was adopted by the Company, all assets and liabilities are recorded according to the respective practice. i) Financial assets Financial assets are classified into the following categories: assets measured at amortized cost, fair value through profit or loss and fair value through other comprehensive income. Assets are classified according to the definition of the business plan adopted by the Company and the characteristics of the cash flow of the financial asset. · Recognition and measurement The Company classifies, at initial recognition, its financial assets into three categories: i) assets measured at amortized cost ii) fair value through profit or loss and iii) fair value through other comprehensive income. · Amortized cost Assets measured at amortization cost must be measured if both of the following conditions are met: i) the financial asset is maintained within the business plan whose objective is to maintain financial assets for the purpose of receiving contractual cash flows ii) the contractual terms of the financial asset give rise, on specific dates, to cash flows that exclusively constitute payments of principal and interest on the principal amount outstanding, the Company shall recognize its interest income, exchange gains and losses and impairment directly in the income statement · Fair value through profit or loss Financial assets should be measured at fair value through profit or loss only if they are not measured as assets measured at amortized cost or fair value through other comprehensive income. The Company must recognize its interest income, foreign exchange gains and losses, impairment, and other net income are recognized directly in income. · Fair value through other comprehensive income. Financial assets shall be measured at fair value through comprehensive income only when the following conditions are met: i) the financial asset is maintained within a business plan whose objective is achieved by the receipt of contractual cash flow and by the sale of financial assets, ii) the contractual terms of the financial asset give rise, in specific dates and interest on the value of the outstanding principal. The assets measured at fair value through other comprehensive income are classified into two categories: i) debt instruments in which the interest income calculated using the effective interest method, the foreign exchange gains and losses and the impairment are recognized in the statement of income. Other net income is recognized directly in the Company's equity, in "other comprehensive income". In derecognition of the asset, the accumulated result in other comprehensive income is reclassified to income, and ii) equity instrument in which these assets are measured subsequent to the fair value. The dividends are recognized as a gain in profit or loss, unless the dividend represents a clear recovery of part of the cost of the investment. Other net income is recognized directly in the Company's equity in "other comprehensive income" and is never reclassified to income. The fair values of publicly quoted investments are based on current purchase prices. If the market for a financial asset (and for instruments not listed on a stock exchange) is not active, the Company establishes the fair value by using valuation techniques. These techniques include the use of recent transactions contracted with third parties, reference to other instruments that are substantially similar, analysis of discounted cash flows, and option pricing models that make maximum use of market inputs and relies as little as possible on entity-specific inputs. Regular purchases and sales of financial assets are recognized at the trading date on which the Company undertakes to buy or sell the asset. · Derecognition of financial assets Financial assets are derecognized when the rights to receive cash flows from the investments have expired or have been transferred, in the latter case, provided that the Company has transferred significantly all risks and rewards of ownership. If the company holds substantially all the risks and rewards of ownership of the financial asset, it must continue to recognize the financial asset. ii) Financial liabilities Financial liabilities are classified under the following categories: financial liability at amortized cost, fair value through profit or loss. Management determines the classification of its financial liabilities at the time of initial recognition. · Financial liabilities measured at amortized cost The Company shall classify all its financial liabilities as amortized cost, except financial liabilities classified at fair value through profit or loss, derivative liabilities, collateral agreement. Other financial liabilities are measured at amortized cost using the effective interest method. The interest expenses, gains and losses are recognized in the income statement. The Company holds the following non-derivative financial liabilities: borrowings, financing and debentures and trade payables. · Financial liabilities at fair value through profit or loss Financial liabilities classified in category fair value through profit or loss are financial liabilities held for trading or those designated at the time of initial recognition. Derivatives are also classified as trading securities, and thereby are classified so, unless they have been designated as effective hedging instruments. Gains and losses on financial liabilities classified at fair value through profit or loss are recognized in profit or loss · Derecognition of financial liabilities Financial liabilities are written off only when they are extinguished, that is, when the obligation specified in the agreement is settled, canceled or expires. The Company also derecognizes a financial liability when the terms are modified and the cash flows of the modified liability are substantially different, in which case a new financial liability based on the modified terms is recognized at fair value. iii) Offsetting of financial instruments Financial assets and financial liabilities are offset and the net amount is reported in the balance sheet when there is a legally enforceable right to set off the recognized amounts as well as the intention to either settle them on a net basis or to realize the asset and settle the liability simultaneously. iv) Derivative instruments and hedging activities · Derivatives measured at fair value through profit or loss Derivatives are initially recognized at fair value on the date when a derivative contract is entered, thereafter they are subsequently measured at their fair value and any changes are recognized as “Financial income (expenses)” in the income statement. · Cash flow Hedge The Company adopts hedge accounting and designates certain financial liabilities as a hedging instrument of a foreign exchange risk associated to the cash flows from forecast, highly probable exports (cash flow hedges). At the inception of the transaction, the Company documents the relationships between the hedging instruments and the hedged items, as well as its risk management objectives and strategy for undertaking hedging transactions. The Company also documents its assessment, both at the inception of the hedge and on an ongoing basis, of whether the hedging transactions are highly effective in offsetting changes in the cash flows of the hedged items. The effective portion of the changes in the fair value of financial liabilities designated and qualifying as cash flow hedge is recognized on equity, in line item "Hedge accounting”. Any gain or loss related to the ineffective portion is recognized immediately in other operational income/ expenses, if applicable. The amounts accumulated in equity are realized in operational results in the periods when the forecast exports affect the result. When a hedging instrument expires, is settled in advance or the hedging relationship no longer meets the hedge accounting criteria, or even when Management decides to discontinue hedge accounting, all cumulative gains or losses recorded in equity at the time remain recognized in equity and, from that moment, the exchange variations are recorded in the financial income/expenses. When the forecast transaction is completed, the gain or loss is reclassified to operational result. When a forecast transaction is no longer expected to take place, the cumulative gain or loss previously recognized in shareholders’ equity is immediately transferred to the income statement, in line item “ Other operational”. The movements of the hedge amounts denominated as export cash flow hedges are shown in note 13 – Financial Instruments. · Net investment hedge For net investment hedge, the Company designates part of its financial liabilities as hedging instruments of its overseas investments with functional currencies other than the Group’s functional currency, according to IAS39. Such relationship occurs since the financial liabilities are related to the investments in the amounts required for the effective relationship. At the inception of the hedge relationship, the Company documents the relationship between the hedging instrument and the hedged item, along with its risk management objectives and its strategy for undertaking hedge transactions. Furthermore, at the inception of the hedge and on an ongoing basis, the Company documents whether the hedging instrument is highly effective in offsetting changes in fair values of the hedged item. The effective portion of changes in the fair value of financial liabilities that are designated and qualify as a net investment hedge is recognized in equity in line item “Hedge Accounting”. The gain or loss relating to the ineffective portion is recognized in other operating, when applicable. If at some point of the hedging relationship the balance of the debt is higher than the balance of the investment, the exchange variation on the excess debt will be reclassified to the statement of profit or loss as an other operating income / expenses (ineffectiveness of the hedge). The amounts accumulated in equity will be realized in the statement of profit or loss upon disposal or partial disposal of the foreign operation. The changes in the amounts of hedge denominated as Net investment hedge are shown in note 13 – Financial Instruments.
Segment information	An operating segment is a component of the Group committed to the business activities from which it can obtain revenues and incur expenses, including revenues and expenses related to transactions with any other components of the Group. All the operating results of operating segments are reviewed regularly by the Executive Officers of CSN to enable decisions regarding resources to be allocated to the segment and assessment of its performance. The Company maintains distinct financial information for the distinct segments.
Government grants	Government grants are not recognized until there is reasonable assurance that the Company will comply to the conditions attaching to them and assurance that the grants will be received, so then they will be recognized in profit or loss on a systematic basis over the periods in which the Company recognizes as expenses the related costs that the grants are intended to compensate. The Company has state tax incentives in the North and Northeast regions, which are recognized in profit or loss as a reduction of the corresponding costs, expenses and taxes.
Noncurrent assets held for sale and discontinued operations	Noncurrent assets and groups of assets are classified as held for sale if their carrying amount is recovered mainly through a sale transaction and not through continued use. The criteria for classification of items held for sale are considered to be met only when the sale is highly probable and the asset or group of assets is available for immediate sale. Assets and liabilities classified as held for sale are presented separately as current items in the balance sheet. Classification as a discontinued operation occurs through disposal, or when the transaction meets the criteria to be classified as held for sale if this occurs earlier. A discontinued operation is a component of a Group business which comprises operations and cash flows that may be clearly distinct from the rest of the Group and represent a separate business line or geographical area of ​​operations. The result of discontinued operations is presented in a single amount in the income statement, including the total income after income tax of these operations, less any impairment loss.
New standards and interpretations issued and not yet adopted	The following standards and interpretations have been issued and will be mandatory for subsequent accounting periods, that is, as of January 1, 2019, 2020 and 2021 and were not early adopted by the Group for the year ended December 31, 2018: Standard Main items introduced by the standard Effective date IFRS16 – Leases This new standard defines the principles for recognition, measurement, presentation and disclosure of leases and introduces a single model for the accounting of leases in the balance sheet for the lessees. A lessee recognizes a right of use asset that represents his right to use the leased asset and a lease liability that represents his obligation to make lease payments. Optional exemptions are available for short-term leases and low-value items. For lessors, accounting treatment remains practically the same, with the classification of leases as operating leases or financial leases. IFRS 16 replaces existing lease standards, including IAS 17 - Leasing operations and IFRIC 4, SIC 5 and SIC 27 - Complementary aspects of leasing operations January 1, 2019 IFRIC 23 – Uncertainty over Income Tax Treatments Can be unclear how tax law applies to a particular transaction or circumstance. This interpretation complements IAS 12 – Income Tax, to clarify how to reflect the effects of uncertainty over income tax treatments. January 1, 2019 The Conceptual framework for financial reporting Review of the Conceptual Framework by establishing a comprehensive set of concepts for guidance on financial performance reporting; better definitions and guidelines, highlighting the definition of a liability; and clarification in relevant areas. January 1, 2020 The following information presents the possible impacts on the adoption of IFRS16 – Leases and IFRIC 23 – Uncertainty over Income Tax Treatments, which were available at the time of the preparation of these financial statements. In this way, these preliminary assessments and their potential impacts are subject to change until the initial adoption is disclosed in the 2019 financial statements. · IFRS 16 – Leases IFRS 16 aims to unify the accounting model of the lease, requiring lessee to recognize the assets and liabilities of all leases at present value, unless it has the following characteristics that are in the scope exemption from the rule: (i) contract with a term of not more than twelve months; and ii) has a low value or is based on variable values. The Company concluded that with the adoption of the standard, we will have a reduction in operating expenses and an increase in financial expenses, once the asset "right of use" is amortized and the lease liability is updated to reflect the consideration to be paid over the contract period. The standard is applicable as from January 1, 2019, the Company opted to apply the modified retrospective approach, recognizing the cumulative effect as an adjustment in the opening balance. The Company estimates the impact of R$578 million in the consolidation in the initial recognition of the right of use and lease liabilities. · IFRIC 23 - Uncertainty over Income Tax Treatments This interpretation is intended to clarify how the company should evaluate the uncertainties in accounting for income taxes when the applicable legislation is not clear. The company evaluated current events and the accounting treatment applied in each situation in the light of this interpretation, we concluded that IFRIC 23 does not have effects arising from tax positions adopted that may be challenged by the Brazilian tax authorities.

2. SUMMARY OF SIGNIFICANT ACC_3

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies Tables Abstract
Subsidiaries, joint ventures and joint operations	Equity interests (%) Companies 12/31/2018 12/31/2017 Core business Direct interest in subsidiaries: full consolidation CSN Islands VII Corp. 100.00 100.00 Financial transactions CSN Islands XI Corp. 100.00 100.00 Financial transactions CSN Islands XII Corp. 100.00 100.00 Financial transactions CSN Minerals S.L.U. (1) 100.00 Equity interests CSN Export Europe, S.L.U. (1) 100.00 Financial transactions and Equity interests CSN Metals S.L.U. (1) 100.00 Equity interests and Financial transactions CSN Americas S.L.U. (1) 100.00 Equity interests and Financial transactions CSN Steel S.L.U. 100.00 100.00 Equity interests and Financial transactions TdBB S.A (*) 100.00 100.00 Equity interests Sepetiba Tecon S.A. 99.99 99.99 Port services Minérios Nacional S.A. 99.99 99.99 Mining and Equity interests Companhia Florestal do Brasil 99.99 99.99 Reforestation Estanho de Rondônia S.A. 99.99 99.99 Tin Mining Companhia Metalúrgica Prada 99.99 99.99 Manufacture of containers and distribution of steel products CSN Gestão de Recursos Financeiros Ltda. (*) 99.99 99.99 Management of funds and securities portfolio CSN Mineração S.A. 87.52 87.52 Mining and Equity interests CSN Energia S.A. 99.99 99.99 Sale of electric power FTL - Ferrovia Transnordestina Logística S.A. 91.69 90.78 Railroad logistics Nordeste Logística S.A. 99.99 99.99 Port services Aceros México CSN (2) 0.08 Commercial representation, sales of steel and related activities CSN Inova Ltd.(3) 100.00 Advisory and implementation of new development projects Indirect interest in subsidiaries: full consolidation Companhia Siderúrgica Nacional (4) 100.00 Steel Lusosider Projectos Siderúrgicos S.A. 100.00 99.94 Equity interests and product sales Lusosider Aços Planos, S. A. 99.99 99.99 Steel and Equity interests CSN Resources S.A. 100.00 100.00 Financial transactions and Equity interests Companhia Brasileira de Latas 99.00 99.99 Sale of cans and containers in general and Equity interests Companhia de Embalagens Metálicas - MMSA 99.67 99.67 Production and sale of cans and related activities Companhia de Embalagens Metálicas - MTM 99.67 99.67 Production and sale of cans and related activities CSN Steel Holdings 1, S.L.U. 100.00 100.00 Financial transactions, product sales and Equity interests CSN Productos Siderúrgicos S.L. 100.00 100.00 Financial transactions, product sales and Equity interests Stalhwerk Thüringen GmbH 100.00 100.00 Production and sale of long steel and related activities CSN Steel Sections UK Limited (*) 100.00 100.00 Sale of long steel CSN Steel Sections Polska Sp.Z.o.o 100.00 100.00 Financial transactions, product sales and Equity interests CSN Asia Limited 100.00 100.00 Commercial representation CSN Mining Holding, S.L 87.52 87.52 Financial transactions, product sales and Equity interests CSN Mining GmbH 87.52 87.52 Financial transactions, product sales and Equity interests CSN Mining Asia Limited 87.52 87.52 Commercial representation Aceros México CSN (2) 99.92 100.00 Commercial representation, sale of steel and related activities Lusosider Ibérica S.A 100.00 99.94 Steel, commercial and industrial activities and equity interests CSN Mining Portugal, Unipessoal Lda. 87.52 87.52 Commercial and representation of products Companhia Siderúrgica Nacional, LLC (4) 100.00 Import and distribution/resale of products Direct interest in joint operations Itá Energética S.A. 48.75 48.75 Electric power generation Consórcio da Usina Hidrelétrica de Igarapava 17.92 17.92 Electric power consortium Direct interest in joint ventures MRS Logística S.A. 18.64 18.64 Railroad transportation Aceros Del Orinoco S.A. 31.82 31.82 Dormant company CBSI - Companhia Brasileira de Serviços de Infraestrutura 50.00 50.00 Equity interests and product sales and iron ore Transnordestina Logística S.A. 46.30 46.30 Railroad logistics Indirect interest in joint ventures MRS Logística S.A. 16.30 16.30 Railroad transportation Direct interest in associates Arvedi Metalfer do Brasil S.A. 20.00 20.00 Metallurgy and Equity interests
Exclusive funds	Equity interests (%) Exclusive funds 12/31/2018 12/31/2017 Core business Direct interest: full consolidation Diplic II - Private credit balanced mutual fund 100.00 100.00 Investment fund Caixa Vértice - Private credit balanced mutual fund 100.00 100.00 Investment fund VR1 - Private credit balanced mutual fund 100.00 100.00 Investment fund
Concessions	Concession Net book value (R$) Classification in balance sheet Sepetiba Tecon S.A. (TECON) 347 million Fixed assets and intangible (Software) Tecar (CSN Mineração) 1,616 million Fixed assets and intangible (Software) FTL - Ferrovia Transnordestina Logística S.A. (FTL) 227 million Fixed assets Transnordestina logística S.A. (TLSA) 8,439 million (1) Investment
New standards and interpretations issued and not yet adopted	Standard Main items introduced by the standard Effective date IFRS16 – Leases This new standard defines the principles for recognition, measurement, presentation and disclosure of leases and introduces a single model for the accounting of leases in the balance sheet for the lessees. A lessee recognizes a right of use asset that represents his right to use the leased asset and a lease liability that represents his obligation to make lease payments. Optional exemptions are available for short-term leases and low-value items. For lessors, accounting treatment remains practically the same, with the classification of leases as operating leases or financial leases. IFRS 16 replaces existing lease standards, including IAS 17 - Leasing operations and IFRIC 4, SIC 5 and SIC 27 - Complementary aspects of leasing operations January 1, 2019 IFRIC 23 – Uncertainty over Income Tax Treatments Can be unclear how tax law applies to a particular transaction or circumstance. This interpretation complements IAS 12 – Income Tax, to clarify how to reflect the effects of uncertainty over income tax treatments. January 1, 2019 The Conceptual framework for financial reporting Review of the Conceptual Framework by establishing a comprehensive set of concepts for guidance on financial performance reporting; better definitions and guidelines, highlighting the definition of a liability; and clarification in relevant areas. January 1, 2020

3. SALE OF FOREIGN SUBSIDIARY (

3. SALE OF FOREIGN SUBSIDIARY (Tables)	12 Months Ended
	Dec. 31, 2018
Sale Of Foreign Subsidiary Tables Abstract
Sale of foreign subsidiary	06/30/2018 Change in working capital In 2018 U$$ R$ U$$ R$ R$ Receipt from disposal of the investment 395,661 1,525,590 1,525,590 Deposit in Warranty 2,000 7,712 7,712 Contractual expenses and fees (d) 2,339 9,021 9,021 Basis price for alienation (a) 400,000 1,542,323 1,542,323 Working Capital Receivable (b) (*) 34,008 131,127 3,581 14,402 145,529 Shareholder's Equity da LLC (c) 133,445 514,537 514,537 Net gain of alienation = (a+b-c-d) 298,224 1,149,892 3,581 14,402 1,164,294
Net investment, results and cash flows from the sale of the investment	3.a) Balance sheet LLC 06/30/2018 ASSETS Current Assets 418,014 Cash and cash equivalents 760 Trade Receivable 114,266 Inventory 299,373 Other current assets 3,615 Non-current assets 191,431 Other non-current assets 205 Property, plant and equipment 191,226 TOTAL ASSETS 609,445 LIABILITIES Current Liabilities 89,810 Borrowings and Financing 5,446 Social and Labor obligations 5,526 Trade payables 76,400 Tax payables 1,398 Other payables 1,040 Non-current liabilities 5,098 Borrowings and Financing 5,098 Shareholders' equity (disposal) 514,537 TOTAL LIABILITIES 609,445 3.b) Statement of Income 06/30/2018 06/30/2017 Net Revenues 997,061 472,409 Cost from sale of goods and rendering of services (888,850) (388,322) Gross profit 108,211 84,087 Selling expenses (24,650) (10,521) General and administrative expenses (15,649) (9,531) Other operating expenses, net (844) (358) Profit before financial income (expenses) 67,068 63,677 Financial income (expenses), net (2,641) (428) Profit (loss) before taxes 64,427 63,249 Income tax and Social Contribution (1,730) - Profit (loss) for the period 62,697 63,249 3.c) Statement of Cash Flows 06/30/2018 06/30/2017 Net cash provided by (used) by operating activities 149,691 (69,216) Net cash provided by (used) by investing activities (6,269) (2,492) Net cash provided by (used) by financing activities (176,592) (1,860) Increase (decrease) in cash and cash equivalents for the period (33,170) (73,568) Cash and equivalents at the beginning of the year 33,930 112,428 Cash and equivalents at the end of the year 760 38,860 Net revenue receipts from sale of subsidiary LLC In 2018 Net cash received from the sale of the asset 1,525,590 Cash and cash equivalents transferred on the sale of the assets (760) Working capital received 145,529 Net cash provided by the sale of assets 1,670,359

4. CASH AND CASH EQUIVALENTS (T

4. CASH AND CASH EQUIVALENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Cash And Cash Equivalents
Cash and cash equivalents	Consolidated 12/31/2018 12/31/2017 Current Cash and cash equivalents Cash and banks 1,124,714 193,702 Short-term investments In Brazil: Government securities 10,247 12,100 Private securities 609,480 644,525 619,727 656,625 Abroad: Time deposits 503,563 2,561,245 Total short-term investments 1,123,290 3,217,870 Cash and cash equivalents 2,248,004 3,411,572

5. FINANCIAL INVESTMENTS (Table

5. FINANCIAL INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Financial Investments Tables Abstract
FINANCIAL INVESTMENTS	Consolidated Current Non-Current 12/31/2018 12/31/2017 12/31/2018 CDB - Certificate of bank deposit 882,376 716,218 Government securities (2) 13,337 19,494 Time Deposit (3) 7,772 895,713 735,712 7,772

6. TRADE RECEIVABLES (Tables)

6. TRADE RECEIVABLES (Tables)	12 Months Ended
	Dec. 31, 2018
Trade Receivables Tables Abstract
Trade receivables	Consolidated 12/31/2018 12/31/2017 Trade receivables Third parties Domestic market 1,369,396 1,290,823 Foreign market 852,821 982,846 2,222,217 2,273,669 Allowance for doubtful debts (237,352) (191,979) 1,984,865 2,081,690 Related Parties (note 19 b) 93,317 115,388 2,078,182 2,197,078
Gross trade receivables from third parties	Consolidated 12/31/2018 12/31/2017 Current 1,514,847 1,391,839 Past-due up to 30 days 177,287 167,760 Past-due up to 180 days 47,684 142,346 Past-due over 180 days 482,399 571,724 2,222,217 2,273,669
Changes in allowance for doubtful debts	Consolidated 12/31/2018 12/31/2017 Opening balance (191,979) (172,782) Expected credit losses (53,706) (36,697) Recovery of receivables 8,333 17,500 Closing balance (237,352) (191,979)

7. INVENTORIES (Tables)

7. INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2018
Inventories Tables Abstract
Inventory	Consolidated 12/31/2018 12/31/2017 Finished goods 1,362,981 1,308,802 Work in progress 1,122,933 1,135,589 Raw materials 1,560,499 1,050,588 Spare parts 856,097 814,725 Iron ore 258,612 278,041 Advances to suppliers 36,192 12,514 (-) Provision for losses (157,754) (135,840) 5,039,560 4,464,419
Changes in provision for inventory losses	Consolidated 12/31/2018 12/31/2017 Opening balance (135,840) (101,176) (Estimated losses) / Reversal of inventories with low turnover and obsolescence (21,914) (34,664) Closing balance (157,754) (135,840)

8. OTHER CURRENT AND NON-CURR_2

8. OTHER CURRENT AND NON-CURRENT ASSETS (Tables)	12 Months Ended
	Dec. 31, 2018
Other Current And Noncurrent Assets Tables Abstract
Other current and non-current assets	Consolidated Current Non-current 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Judicial deposits (note 17) 347,950 339,351 Credits with the PGFN (1) 46,774 46,774 Recoverable taxes (2) 1,412,335 866,986 1,822,388 401,071 Prepaid expenses 49,830 50,078 49,808 30,741 Actuarial assets - related parties (Note 19 b) 99,894 111,281 Derivative financial instruments (note 13 I) 351 Securities held for trading (note 13 I) 4,503 2,952 Iron ore inventory (3) 144,499 144,499 Northeast Investment Fund – FINOR 26,598 26,598 Loans with related parties (notes 19 b and 13 I) 2,675 2,441 706,605 554,694 Other receivables from related parties (Note 19 b) 3,649 3,577 218,840 30,770 Other receivables (note 13 I) 7,451 20,024 Principal and monetary adjustment related to the Eletrobrás' compulsory loan (Note 13 I) (4) 813,428 784,741 Dividends receivable (note 19b) (*) 46,171 41,528 Employee debt (*) 31,645 33,942 Sea freight (5) 117,156 Other receivables (*) 12,753 3,667 Others 71,956 67,544 988 37,931 1,753,024 1,072,715 4,285,223 2,528,475

9. INVESTMENTS (Tables)

9. INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Investments Tables Abstract
Direct equity interests in subsidiaries, joint ventures, joint operations, associates and other investments	12/31/2018 12/31/2017 Companies Number of shares (in units) Participation in Participation in % equity interest Assets Liabilities Fair Value Allocation Net income / (loss) for the year % equity interest Assets Liabilities Fair Value Allocation Net income / (loss) for the year Shareholders’ equity Shareholders’ equity Joint-venture and Joint-operation MRS Logística S.A.(*) 126,716,070 37.27 3,125,912 1,693,200 1,878,095 194,403 37.27 3,039,761 1,714,729 1,782,162 171,905 CBSI - Companhia Brasileira de Serviços de Infraestrutura 1,876,146 50.00 25,941 19,997 5,944 4,501 50.00 16,005 13,654 2,351 1,785 Transnordestina Logística S.A. 24,168,304 46.30 4,065,604 2,883,851 1,181,753 271,116 (20,429) 46.28 3,806,380 2,604,198 1,202,182 271,116 (21,357) 7,217,457 4,597,048 3,065,792 271,116 178,475 6,862,146 4,332,581 2,986,695 271,116 152,333 Associates Arvedi Metalfer do Brasil 46,994,971 20.00 40,712 26,308 14,404 (5,087) 20.00 43,653 23,978 19,675 (4,368) 40,712 26,308 14,404 (5,087) 43,653 23,978 19,675 (4,368) Classified as fair value through profit or loss and comprehensive income (Note 13 I) Usiminas 2,250,623 2,200,459 Panatlântica 28,566 21,974 2,279,189 2,222,433 Other Investments 112 76 Total Investments 5,359,497 271,116 5,228,879 271,116 5,630,613 5,499,995
Changes of investments balances in subsidiaries, joint ventures, joint operations, associates and other investments	Consolidated 12/31/2018 12/31/2017 Opening balance of investments 5,499,995 4,568,451 Opening balance of loss provisions Capital increase 20,579 Dividends (87,846) (79,189) Comprehensive income (1) 272 850,640 Equity in results of affiliated companies (2) 173,145 147,800 Receipt of sale - Usiminas' shares (39,377) Update of shares measured at Fair Value through profit or loss (VJR) (note 13 II) 96,133 Amortization of fair value – investment in MRS (11,746) (11,746) Others 37 3,460 Closing balance of investments 5,630,613 5,499,995
Equity in results	Consolidated 12/31/2018 12/31/2017 Equity in results of affiliated companies MRS Logística S.A. 194,403 171,905 CBSI - Companhia Brasileira de Serviços de Infraestrutura 4,501 1,785 Transnordestina Logística S.A. (20,429) (21,357) Arvedi Metalfer do Brasil S.A. (5,087) (4,368) Others (243) (165) 173,145 147,800 Eliminations To cost of sales (42,806) (40,823) To taxes 14,554 13,880 Others Amortization of fair value – investment in MRS (11,746) (11,746) Others 2,559 Equity in results adjusted 135,706 109,111
Joint ventures and joint operations financial information	12/31/2018 12/31/2017 Joint-Venture Joint-Operation Joint-Venture Joint-Operation Equity interest (%) MRS Logística CBSI Transnordestina Logística Itá Energética MRS Logística CBSI Transnordestina Logística Itá Energética 34.94% 50.00% 46.30% 48.75% 34.94% 50.00% 46.30% 48.75% Balance sheet Current assets Cash and cash equivalents 345,962 2,091 19,234 29,870 484,978 101 5,763 16,231 Advances to suppliers 17,750 73 1,734 937 14,911 37 22 Other current assets 736,768 41,284 108,851 16,718 685,311 28,475 49,494 16,447 Total current assets 1,100,480 43,448 129,819 47,525 1,185,200 28,613 55,257 32,700 Non-current assets Other non-current assets 804,570 2,111 222,630 25,840 693,434 974 238,004 27,459 Investments, PP&E and intangible assets 6,482,292 6,324 8,428,567 457,578 6,277,550 2,423 7,927,881 484,406 Total non-current assets 7,286,862 8,435 8,651,197 483,418 6,970,984 3,397 8,165,885 511,865 Total Assets 8,387,342 51,883 8,781,016 530,943 8,156,184 32,010 8,221,142 544,565 Current liabilities Borrowings and financing 422,793 4,350.0000 75,906 668,947 1,411 52,691 Other current liabilities 1,368,290 33,844 179,816 18,298 1,272,365 25,898 113,739 33,666 Total current liabilities 1,791,083 38,194 255,722 18,298 1,941,312 27,309 166,430 33,666 Non-current liabilities Borrowings and financing 2,111,518 1,262 5,754,073 2,084,422 5,457,768 Other non-current liabilities 640,535 539 218,839 15,113 575,170 434 3,471 Total non-current liabilities 2,752,053 1,801 5,972,912 15,113 2,659,592 5,458,202 3,471 Shareholders’ equity 3,844,206 11,888 2,552,382 497,532 3,555,280 4,701 2,596,510 507,428 Total liabilities and shareholders’ 8,387,342 51,883 8,781,016 530,943 8,156,184 32,010 8,221,142 544,565 01/01/2018 at 12/31/2018 01/01/2017 a 12/31/2017 Joint-Venture Joint-Operation Joint-Venture Joint-Operation Equity interest (%) MRS Logística CBSI Transnordestina Logística Itá Energética MRS Logística CBSI Transnordestina Logística Itá Energética 34.94% 50.00% 46.30% 48.75% 34.94% 50.00% 46.30% 48.75% Statements of Income Net revenue 3,726,448 166,080 166,358 3,492,805 135,399 168,194 Cost of sales and services (2,476,628) (142,254) (77,829) (2,307,108) (120,647) (76,810) Gross profit 1,249,820 23,826 88,529 1,185,697 14,752 91,384 Operating (expenses) income (313,606) (10,884) (18,020) (60,104) (283,151) (8,340) (32,245) (58,465) Financial income (expenses), net (151,839) (179) (26,103) (126) (187,295) (1,004) (13,938) 317 Income before income tax and social 784,375 12,763 (44,123) 28,299 715,251 5,408 (46,183) 33,236 Current and deferred income tax (262,760) (3,761) (9,452) (254,001) (1,838) (11,105) (Loss) profit for the year, net 521,615 9,002 (44,123) 18,847 461,250 3,570 (46,183) 22,131
Assumptions for impairment test	Cash Flow Projection Until 2057 Gross Margin Based on market studies to capture operations costs and loads, according studied of market trends. Estimated Costs Costs based on studies and market trends. Growth rate in perpetuity Growth rate was not considered due to the projection model until the end of the concession. Discount rate Between 5.1% to 7.9% in real terms.

10. PROPERTY, PLANT AND EQUIP_2

10. PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2018
Property, plant and equipment [abstract]
Property, plant and equipment	Consolidated Land Buildings and Infrastructure Machinery, equipment and facilities Furniture and fixtures Construction Other (*) Total Balance at December 31, 2017 279,740 2,796,947 11,985,920 33,103 2,475,935 393,194 17,964,839 Cost 279,740 3,819,929 21,674,362 164,152 2,475,935 669,096 29,083,214 Accumulated depreciation (1,022,982) (9,688,442) (131,049) (275,902) (11,118,375) Balance at December 31, 2017 279,740 2,796,947 11,985,920 33,103 2,475,935 393,194 17,964,839 Translation adjustment 7,730 11,653 86,553 543 4,275 4,605 115,359 Acquisitions 622 1,259 144,499 1,574 1,158,788 21,152 1,327,894 Capitalized interest (notes 25 and 30) 71,611 71,611 Write-off and estimated losses, net of reversal (note 24) (9,768) (21,468) (6) (4,348) (2,655) (38,245) Depreciation (note 23) (134,534) (1,043,188) (5,394) (22,456) (1,205,572) Transfers to other asset categories 30,031 685,005 891 (424,443) (291,484) Write-off - sale of subsidiary LLC (238) (16,950) (145,958) (181) (6,070) (21,829) (191,226) Transfers to intangible assets 5,559 (1,752) 3,807 Others (9,651) 8,440 (392) (1,603) Balance as of December 31, 2018 287,854 2,678,638 11,687,271 30,530 3,282,436 80,135 18,046,864 Cost 287,854 3,751,429 22,426,782 165,331 3,282,436 355,768 30,269,600 Accumulated depreciation (1,072,791) (10,739,511) (134,801) (275,633) (12,222,736) Balance as of December 31, 2018 287,854 2,678,638 11,687,271 30,530 3,282,436 80,135 18,046,864
Construction in progress	Consolidated Project description Start date Completion date 12/31/2018 12/31/2017 Logistics Current investments for maintenance of current operations. 89,595 106,956 89,595 106,956 Mining Expansion of Casa de Pedra Mine capacity production. 2007 2020 (1) 844,194 750,999 Expansion of TECAR export capacity. 2009 2022 (2) 289,298 275,811 Current investments for maintenance of current operations. 725,616 408,522 1,859,108 1,435,332 Steel Supply of 16 torpedo’s cars for operation in the steel industry 2008 2020 94,920 99,483 Current investments for maintenance of current operations. (3) 558,922 228,029 653,842 327,512 Cement Construction of cement plants. 2011 2023 (4) 585,163 554,865 Current investments for maintenance of current operations. 94,728 51,270 679,891 606,135 Construction in progress 3,282,436 2,475,935
Estimated useful lives	Consolidated 12/31/2018 12/31/2017 Buildings 38 39 Machinery, equipment and facilities 22 21 Furniture and fixtures 11 12 Others 15 17
Capitalize borrowing costs rates	Rates 12/31/2018 12/31/2017 Unspecified projects 6.31% 8.63%

11. INTANGIBLE ASSETS (Tables)

11. INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2018
Intangible Assets Tables Abstract
Intangible assets	Consolidated Goodwill Customer relationships Software Trademarks Rights and licenses (*) Others Total Balance at December 31, 2017 3,590,931 300,875 73,185 134,137 3,172,469 449 7,272,046 Cost 3,834,234 513,068 167,162 134,137 3,185,701 449 7,834,751 Accumulated amortization (133,973) (212,193) (93,977) (13,232) (453,375) Adjustment for accumulated recoverable value (109,330) (109,330) Balance at December 31, 2017 3,590,931 300,875 73,185 134,137 3,172,469 449 7,272,046 Translation adjustment 34,107 148 15,872 58 50,185 Acquisitions and expenditures 1,216 984 2,200 Transfer of property, plant and equipment (3,807) (3,807) Amortization (note 23) (46,209) (15,770) (5,470) (67,449) Balance as of December 31, 2018 3,590,931 288,773 54,972 150,009 3,166,999 1,491 7,253,175 Cost 3,831,338 573,614 161,067 150,009 3,185,701 1,491 7,903,220 Accumulated amortization (131,077) (284,841) (106,095) (18,702) (540,715) Adjustment for accumulated recoverable value (109,330) (109,330) Balance as of December 31, 2018 3,590,931 288,773 54,972 150,009 3,166,999 1,491 7,253,175
Estimated useful lives	Consolidated 12/31/2018 12/31/2017 Software 7 8 Customer relationships 13 13
Cash generating units	Consolidated Goodwill Trademarks Total Cash generating unity Segment 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Packaging (1) Steel 158,748 158,748 158,748 158,748 Long Stel (2) Steel 235,595 235,595 150,009 134,137 385,604 369,732 Minning (3) Mining 3,196,588 3,196,588 3,196,588 3,196,588 3,590,931 3,590,931 150,009 134,137 3,740,940 3,725,068
Assumptions for impairment test	Metal packaging Flat steel (*) Logistic (**) Mining Measurement of recoverable value Discounted Cash Flow Discounted Cash Flow Discounted Cash Flow Discounted Cash Flow Cash flow projection Until 2028 + perpetuity Until 2028 + perpetuity Until 2027 Until 2054 Gross Margin Gross margin updated based on historical data, impacts of business restructuring and market trends Gross margin updated based on historical data and market trends. Estimated based on market studies for cargo captures and operational costs according market trends. Reflects projection of costs due to the progress of the mining plan as well as startup and ramp up of projects . Price and exchange rate projected according industry reports. Cost atualization Cost based on historical data of each product and impacts of business restructuring Updated costs based on historical data and market trends Costs based on historical data and market trends Updated costs based on historical data, progress of mining plan as well as startup and ramp up of projects Growth Rate Growth of 1.5% p.a in real terms updated by long term inflation of 4.0% p.a. Growth of 1.4% p.a in real terms updated by long term inflation of 2.5% p.a. of the Euro zone Growth of 1.5% p.a in real terms Without growth in real terms updated only by long term inflation of 4.0% p.a. Discount rate For Metal packaging, flat steel and mining, these cash flows were considered using a discount rate after taxes between 5% and 13% p.a. in

12. BORROWINGS, FINANCING AND_2

12. BORROWINGS, FINANCING AND DEBENTURES (Tables)	12 Months Ended
	Dec. 31, 2018
Borrowings Financing And Debentures Tables Abstract
Borrowings, financing and debentures	Consolidated Current liabilities Non-current liabilities 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Debt agreements in the international market Variable interest in: US$ Prepayment (1) 1,016,737 791,163 3,830,240 4,097,509 Fixed interest in: US$ Bonds, Perpetual Bonds and ACC (2) 2,490,178 523,509 8,613,491 8,920,342 Intercompany EUR Others 181,056 251,630 106,535 197,131 3,687,971 1,566,302 12,550,266 13,214,982 Debt agreements in Brazil Securities with variable interest in: R$ BNDES/FINAME, Debentures, NCE e CCB (3) 1,890,450 4,982,159 10,710,678 9,702,972 Securities with fixed interest in: R$ Prepayment 103,376 3,303 100,000 1,993,826 4,985,462 10,710,678 9,802,972 Total Borrowings and Financing 5,681,797 6,551,764 23,260,944 23,017,954 Transaction Costs and Issue Premiums (28,358) (24,862) (87,309) (34,012) Total Borrowings and Financing + Transaction Costs 5,653,439 6,526,902 23,173,635 22,983,942
Average interest rate	Consolidated 12/31/2018 Average interest rate (*) Total debt US$ 5.88% 15,950,646 R$ 8.19% 12,704,504 EUR 3.88% 287,591 28,942,741
Maturities of borrowings, financing and debentures	Consolidated 12/31/2018 Principal Bank loans Capital markets Development agencies Total 2020 3,187,269 3,499,177 66,892 6,753,338 2021 3,263,810 116,003 59,455 3,439,268 2022 3,087,732 36,667 58,154 3,182,553 2023 2,669,211 1,356,180 56,985 4,082,376 2024 1,276,001 67,734 1,343,735 After 2024 584,874 584,874 Perpetual bonds 3,874,800 3,874,800 13,484,023 8,882,827 894,094 23,260,944
New funding transactions and amortization	Consolidated 12/31/2018 12/31/2017 Opening balance 29,510,844 30,441,018 Funding raised 2,154,471 538,771 Principal repayments (5,019,978) (1,528,023) Payments of charges (2,141,710) (2,634,931) Provision of charges 2,009,688 2,438,555 Write-off – sale of subsidiary LLC (10,544) Others (1) 2,324,303 255,454 Closing balance 28,827,074 29,510,844
Group captures and amortized loans	nature Raised Amortization of principal Amortization of charges Prepayment 849,654 280,923 Bonds, Bonds Perpétuos and ACC 1,749,099 1,632,464 675,370 BNDES/FINAME, Debêntures, NCE and CCB 10,792 1,948,014 1,173,380 Others 394,580 589,846 12,037 2,154,471 5,019,978 2,141,710
Borrowings, financing and debentures amortization	Currency Maturities Borrowings Tax foreclosure Others Total 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Transnordestina Logísitca R$ Until 09/19/2056 and Indefinite 2,108,917 2,541,347 35,336 22,214 8,231 3,866 2,152,484 2,567,427 FTL - Ferrovia Transnordestina R$ 11/15/2020 62,407 69,405 62,407 69,405 Sepetiba Tecon 36,308 36,308 Cia Metalurgica Prada R$ Indefinite 333 333 11,942 18,540 12,275 18,873 CSN Energia R$ Until 11/26/2023 and Indefinite 2,829 2,829 1,920 4,749 2,829 CSN Mineração R$ Until 12/26/2024 1,407,363 2,000,000 1,407,363 2,000,000 Estanho de Rondônia R$ 07/15/2022 3,153 3,153 3,153 3,153 Minérios Nacional S.A. R$ Until 09/10/2021 7,305 7,305 - Total in R$ 3,589,145 4,613,905 38,498 25,376 22,093 58,714 3,649,736 4,697,995 CSN Islands XI US$ 09/21/2019 547,094 750,000 547,094 750,000 CSN Islands XII US$ Perpetual 1,000,000 1,000,000 1,000,000 1,000,000 CSN Resources US$ Until 02/13/2023 1,402,906 1,200,000 1,402,906 1,200,000 Total in US$ 2,950,000 2,950,000 2,950,000 2,950,000 CSN Steel S.L. EUR 1/31/2020 48,000 120,000 48,000 120,000 Lusosider Aços Planos EUR Indefinite 75,000 25,000 75,000 25,000 Total in EUR 123,000 145,000 123,000 145,000 Total in R$ 11,976,657 10,334,149 11,976,657 10,334,149 15,565,802 14,948,054 38,498 25,376 22,093 58,714 15,626,393 15,032,144

13. FINANCIAL INSTRUMENTS (Tabl

13. FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Financial Instruments Tables Abstract
Financial instruments	Consolidated Disclosed on 12/31/2017 Applied on 01/01/2018 Balance at 12/31/2017 Assets Current Cash and cash equivalents Loans and Receivables Amortized cost 3,411,572 Short term investments Loans and Receivables Amortized cost 735,712 Accounts Receivable Net Loans and Receivables Amortized cost 2,197,078 Loans with related parties Loans and Receivables Amortized cost 2,441 Derivative financial instruments VJR VJR Trading securities VJR VJR 2,952 Dividends receivable Amortized cost Amortized cost 41,528 Non-current Loans with related parties Loans and Receivables Amortized cost 554,694 Other trade receivables Loans and Receivables Amortized cost 20,024 Investments Available for sale VJR 2,222,479 Liabilities Current Borrowings and financing Amortized cost Amortized cost 6,551,764 Derivative financial instruments VJR VJR Trade payables Amortized cost Amortized cost 2,460,774 Dividends and interest on capital Amortized cost Amortized cost 510,692 Non-current Borrowings and financing Amortized cost Amortized cost 23,017,953
Financial instruments at fair value through profit or loss	Consolidated 12/31/2018 12/31/2017 Notes Fair value through profit or loss Measured at amortized cost Balances Fair value through profit or loss Measured at amortized cost Balances Assets Current Cash and cash equivalents 4 2,248,004 2,248,004 3,411,572 3,411,572 Financial investments 5 895,713 895,713 735,712 735,712 Trade receivables 6 2,078,182 2,078,182 2,197,078 2,197,078 Dividends receivable 8 46,171 46,171 41,528 41,528 Derivative financial instruments 8 351 351 Trading securities 8 4,503 4,503 2,952 2,952 Loans - related parties 8 2,675 2,675 2,441 2,441 Total 4,854 5,270,745 5,275,599 2,952 6,388,331 6,391,283 Non-current Financial investments 5 7,772 7,772 Other trade receivables 8 820,879 820,879 804,765 804,765 Investments 9 2,279,189 2,279,189 2,222,433 2,222,433 Loans - related parties 8 706,605 706,605 554,694 554,694 Total 2,279,189 1,535,256 3,814,445 2,222,433 1,359,459 3,581,892 Total Assets 2,284,043 6,806,001 9,090,044 2,225,385 7,747,790 9,973,175 Liabilities Current Borrowings and financing 12 5,681,797 5,681,797 6,551,764 6,551,764 Trade payables 3,473,822 3,473,822 2,505,695 2,505,695 Dividends and interest on capital 14 932,005 932,005 510,692 510,692 Total 10,087,624 10,087,624 9,568,151 9,568,151 Non-current Borrowings and financing 12 23,260,945 23,260,945 23,017,953 23,017,953 Total 23,260,945 23,260,945 23,017,953 23,017,953 Total Liabilities 33,348,569 33,348,569 32,586,104 32,586,104
Investments in financial instruments classified as available-for-sale	Consolidated 12/31/2018 12/31/2017 Level 1 Level 2 Balance Level 1 Balance Assets Current Financial assets at fair value through profit or loss Derivative financial instruments 351 351 Trading securities 4,503 4,503 2,952 2,952 Non-current Available-for-sale financial assets Investments 2,279,189 2,279,189 2,222,433 2,222,433 Total Assets 2,283,692 351 2,284,043 2,225,385 2,225,385
Foreign exchange exposure	12/31/2018 Foreign Exchange Exposure (Amounts in US$’000) (Amounts in €’000) Cash and cash equivalents overseas 376,581 3,387 Trade receivables 358,283 1,124 Other assets 8,623 4,594 Total Assets 743,487 9,105 Borrowings and financing (4,116,508) (48,791) Trade payables (175,404) (7,946) Other liabilities (3,529) (920) Total Liabilities (4,295,441) (57,657) Foreign exchange exposure (3,551,954) (48,552) Cash flow hedge accounting 2,076,045 Net Investment hedge accounting 48,000 Net foreign exchange exposure (1,475,909) (552) Perpetual bonds 1,000,000 Net foreign exchange exposure excluding perpetual bonds (475,909) (552)
Dollar x Euro swap	Consolidated 12/31/2018 Appreciation (R$) Fair value (market) Impact on financial income (expenses) in 2018 Counterparties Maturity Functional Currency Notional amount Asset position Liability position Amounts receivable / (payable) BCP 03/08/2019 Dollar 18,563 71,967 (71,616) 351 (1) Total dollar-to-euro swap 18,563 71,967 (71,616) 351 (1) 71,967 (71,616) 351 (1)
Hedging instruments	12/31/2018 Designation Date Hedging Instrument Hedged item Type of hedged risk Hedged period Exchange rate on designation Designated amounts (US$’000) Amortizated part (USD'000) Effect on Result Impact on 11/03/2014 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2016 - 2.4442 500,000 (250,003) 171,983 (357,649) 12/01/2014 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2015 - 2.5601 175,000 (154,999) 36,766 (26,295) 12/18/2014 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate May 2020 2.6781 100,000 (119,670) 07/21/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate July 2019 - March 3.1813 60,000 (41,610) 07/23/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate July 2019 - March 3.2850 100,000 (58,980) 07/23/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.285 30,000 (6,000) 5,102 (14,155) 07/24/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.3254 100,000 (20,000) 16,198 (43,952) 07/27/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.3557 25,000 (5,000) 3,898 (10,382) 07/27/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.3557 70,000 (14,000) 10,914 (29,070) 07/27/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.3557 30,000 (6,000) 4,677 (12,458) 07/28/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.3815 30,000 (6,000) 4,523 (11,839) 3/8/2015 Export prepayments in US$ to third parties Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate October 2018 - 3.3940 355,000 (11,998) 6,179 (164,915) 04/02/2018 Bonds Part of the highly probable future monthly iron ore exports Foreign exchange - R$ vs. US$ spot rate July 2018 - February 2023 3.3104 1,170,045 (195,000) 109,951 (550,320) Total 2,745,045 (669,000) 370,191 (1,441,295)
Changes in hedge accounting	12/31/2017 Movement Realization 12/31/2018 Cash flow hedge accounting 395,524 1,415,962 (370,191) 1,441,295 Fair value of cash flow hedge, net of taxes 395,524 1,415,962 (370,191) 1,441,295
Non-derivative financial liabilities	12/31/2018 Designation Date Hedging Instrument Hedged item Type of hedged risk Exchange rate on designation Designated amounts (EUR'000) Amortized part (USD’000) Impact on shareholders' equity 09/01/2015 Non-derivative financial liabilities in EUR – Debt contract Investments in subsidiaries which EUR is the functional currency Foreign exchange - R$ vs. EUR spot rate 4.0825 120,000 (72,000) 3,941 Total 120,000 (72,000) 3,941
Changes in net investment hedge	12/31/2017 Movement 12/31/2018 Net Investment hedge accounting (17,911) 21,852 3,941 Fair value of net investment hedge in foreign operations (17,911) 21,852 3,941
Currencies used in sensitivity analysis	12/31/2018 Currency Exchange rate Probable scenario Scenario 1 Scenario 2 USD 3,8748 3,7626 4,8435 5,8122 EUR 4,4390 4,2833 5,5488 6,6585 USD x EUR 1,1456 1,1346 1,4320 1,7184 12/31/2018 Interest Interest rate Scenario 1 Scenario 2 CDI 6,40% 8,00% 9,60% TJLP 6,98% 8,73% 10,47% Libor 2,88% 3,60% 4,32%
Sensitivity analysis effects on income statement	12/31/2018 Instruments Notional Risk Probable scenario (*) Scenario 1 Scenario 2 Hedge accounting of exports 2,076,045 Dollar (232,932) 2,011,065 4,022,130 Natural currency position (3,551,954) Dollar 398,529 (3,440,778) (6,881,556) (not including exchange derivatives above) Consolidated exchange position (1,475,909) Dollar 165,597 (1,429,713) (2,859,426) (including exchange derivatives above) Net Investment hedge accounting 48,000 Euro (7,474) 53,268 106,536 Natural currency position (48,552) Euro 7,560 (53,881) (107,762) Consolidated exchange position (552) Euro 86 (613) (1,226) (including exchange derivatives above) Dollar-to-euro swap 18,563 Dollar (1,011) 14,072 23,663
Sensitivity analysis of interest rate swaps	Consolidated Impact on profit or loss Changes in interest rates % p.a Assets Liabilities Probable scenario (*) Scenario 1 Scenario 2 TJLP 6,98 (954,635) (2,793) (16,658) (33,316) Libor 2.88 (4,799,586) (47,391) (34,505) (69,010) CDI 6.40 609,480 (11,667,006) (53,528) (176,924) (353,848)
Contractual maturities of financial liabilities	Consolidated At December 31, 2018 Less than one year From one to two years From two to five years Over five years Total Borrowings, financing and debentures 5,681,797 10,192,606 8,608,664 4,459,675 28,942,742 Trade payables 3,473,822 3,473,822 Dividends and interest on capital 932,005 932,005

14. OTHER PAYABLES (Tables)

14. OTHER PAYABLES (Tables)	12 Months Ended
	Dec. 31, 2018
Other Payables Tables Abstract
Other payables	Consolidated Current Non-current 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Payables to related parties (note 19 b) 35,499 3,097 96,629 Dividends and interest on capital payable (Note 13 I) 932,005 510,692 Advances from customers 137,418 68,521 Taxes in installments 20,179 21,551 73,934 79,242 Profit sharing - employees 113,219 42,699 Taxes payable 8,631 8,410 Provision from consumption and services 392,612 336,886 Third party materials in our possession 45,915 231 Other payables 28,010 31,303 48,134 41,671 1,704,857 1,014,980 227,328 129,323

15. INCOME TAX AND SOCIAL CON_2

15. INCOME TAX AND SOCIAL CONTRIBUTION (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax And Social Contribution Tables Abstract
Income tax and social contribution income (expense)	Consolidated 12/31/2018 12/31/2017 12/31/2016 Income tax and social contribution income (expense) Current (827,229) (358,981) (206,178) Deferred 576,895 (50,128) (60,368) (250,334) (409,109) (266,546)
Reconciliation of income tax and social contribution income (expense)	Consolidated 12/31/2018 12/31/2017 12/31/2016 Profit/(Loss) before income tax and social contribution 5,450,917 520,338 (576,951) Tax rate 34% 34% 34% Income tax and social contribution at combined statutory rate (1,853,312) (176,915) 196,163 Adjustment to reflect the effective rate: Equity in results of affiliated companies 50,134 42,431 22,072 Profit with differentiated rates or untaxed (46,006) 37,605 (287,502) Transfer pricing adjustment (74,836) (34,746) (63,638) Tax loss carryforwards without recognizing deferred taxes (27,683) (368,612) (821,920) Indebtdness limit (38,486) (39,378) (35,391) Unrecorded deferred taxes on temporary differences (11,964) 541,655 643,990 Deferred Income Tax and social contribution on temporary differences 971,972 (Losses)/Reversal for deferred income and social contribution tax credits 835,937 (403,080) 44,691 Income taxes and social contribution on foreign profit (30,219) (29,964) (35,613) Amortization – Goodwill Metalic 31,439 Tax incentives 36,710 14,358 22,673 Deferred taxes on exchange variation in equity (43,667) Other permanent deductions (additions) (18,914) 7,537 16,490 Income tax and social contribution in profit for the period (250,334) (409,109) (266,546) Effective tax rate 5% 79% -46%
Deferred income tax and social contribution	Consolidated 12/31/2016 Movement 12/31/2017 Movement 12/31/2018 Shareholders' P&L Others Shareholders' P&L Others Deferred Income tax losses 970,800 245,846 (79,412) 1,137,234 (177,378) (616) 959,240 Social contribution tax losses 340,629 94,843 (28,588) 406,884 (39,303) (223) 367,358 Temporary differences (2,288,175) 26,778 (390,817) (2,344) (2,654,558) 21,208 793,576 839 (1,838,935) - Provision for tax. social security, labor, civil and environmental risks 256,936 12,963 269,899 (5,846) 3,184 267,237 - Provision for environmental liabilities 95,048 (8,197) 86,851 (19,708) 67,143 - Asset impairment losses 93,908 (5,475) 88,433 (7,092) 81,341 - Inventory impairment losses 35,703 10,111 45,814 (7,054) 38,760 - (Gains)/losses on financial instruments (2,300) 1,388 (912) (2,407) (3,319) - (Gains)/losses on available-for-sale financial assets 705,929 316,563 417,659 530,292 (584,856) 363,095 - Actuarial liability (pension and healthcare plan) 134,578 180,834 (41,065) (1,289) 273,058 (48) 3,022 276,032 - Accrued supplies and services 123,101 (55,385) 67,716 27,928 95,644 - Allowance for doubtful debts 42,008 5,208 47,216 14,199 61,415 - Goodwill on merger 815 (207) 608 (608) - Unrealized ex change differences (1) 1,589,651 56,493 (134,992) 1,511,152 (500,620) 1,010,532 - (Gain) on loss of control over Transnordestina (92,180) (92,180) (92,180) - Cash flow hedge accounting 148,471 (13,992) 134,479 355,563 490,042 - Aquisition Fair Value SWT/CBL (199,001) (21,143) 26,833 (193,311) (16,683) 37,880 (172,114) - Deferred taxes non computed (1,324,437) (566,173) (3,255) (115) (212,236) (38,359) (2,345) (252,940) - (Losses) estimated/ reversals to deferred taxes credits (3,013,730) 82,769 (123,056) (4,130,928) (885,069) 1,929,424 (3,086,573) - Business Combination (1,072,824) 32,288 (1,040,536) 9,724 (1,030,812) - Other 190,149 (8,573) (107,976) (940) 72,660 37,153 (62,051) 47,762 Total (976,746) 26,778 (50,128) (110,344) (1,110,440) 21,208 576,895 (512,337) Total Deferred Assets 70,151 63,119 89,394 Total Deferred Liabilities (1,046,897) (1,173,559) (601,731) Total Deferred (976,746) (1,110,440) (512,337)
Deferred tax assets on tax losses and temporary differences	Nature Description Tax losses In recent periods, the Company started to incur tax losses, mostly because of high financial expenses, since it holds substantially all loans and financings of CSN group and presented a taxable income in 2018. Temporary differences Foreign exchange differences Since 2012 the Company opted for the taxation of exchange differences on a cash basis. As the Company has operated without taxable profit it would not make sense to use this deductibility year by year (accrual basis). As a result of the cash basis tax treatment, taxes are only due, and expenses are only deductible at the time of debt settlement. Losses on Usiminas shares The losses on Usiminas shares are recognized on an accrual basis, but the taxable event will occur only at the time of divestment. Other provisions Various accounting provisions are recognized on an accrual basis, but their taxation occurs only at the time of its realization, such as provisions for contingencies, impairment losses, environmental liabilities, etc.
Income tax and social contribution recognized in shareholders' equity	Consolidated 12/31/2018 12/31/2017 Income tax and social contribution Actuarial gains on defined benefit pension plan 176,700 176,658 Estimated losses for deferred income tax and social contribution credits - actuarial gains (180,048) (180,834) Changes in the fair value of assets measured at fair value through other comprehensive income (530,292) Estimated losses for deferred income tax and social contribution assets - assets measured at fair value through other comprehensive income 530,292 Exchange differences on foreign operations (325,350) (369,017) Cash flow hedge accounting 490,041 134,478 Estimated losses for deferred income tax and social contribution credits - cash flow hedge (490,041) (134,478) (328,698) (373,193)

16. TAX INSTALLMENTS PROGRAMS (

16. TAX INSTALLMENTS PROGRAMS (Tables)	12 Months Ended
	Dec. 31, 2018
Tax Installments Programs Tables Abstract
Taxes in installments	Consolidated Current Non-current 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Federal REFIS Law 11.941/09 12,100 12,552 18,895 20,083 Federal REFIS Law 12.865/13 6,240 5,984 52,661 56,381 Other taxes in installments 1,839 3,015 2,378 2,778 20,179 21,551 73,934 79,242

17. PROVISION FOR TAX, SOCIAL_2

17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2018
Provision For Tax Social Security Labor Civil And Environmental Risks And Judicial Deposits Tables Abstract
Accrued amounts and judicial deposits	Consolidated Accrued liabilities Judicial deposits 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Tax 118,490 113,451 46,321 52,542 Social security 70,084 74,522 50,898 50,098 Labor 362,228 451,173 214,625 202,104 Civil 210,264 148,212 22,024 22,752 Environmental 31,390 37,733 1,900 1,826 Deposit of a guarantee 12,182 10,029 792,456 825,091 347,950 339,351 Classification Current 106,503 105,958 Non-current 685,953 719,133 347,950 339,351 792,456 825,091 347,950 339,351
Changes in the provision for tax, social security, labor, civil and environmental risks	Consolidated Current + Non-current Nature 12/31/2017 Additions Net update on amount Net utilization of reversal 12/31/2018 Tax 113,451 17,941 12,081 (24,983) 118,490 Social security 74,522 2,348 1,996 (8,782) 70,084 Labor 451,173 29,250 55,344 (173,539) 362,228 Civil 148,212 14,921 56,092 (8,961) 210,264 Environmental 37,733 31 6,021 (12,395) 31,390 825,091 64,491 131,534 (228,660) 792,456
Legal matters with possible risk of loss	12/31/2018 12/31/2017 Income tax / Social contribution - Assessment Notice and imposition of fine (AIIM) - Capital gain for an alleged sale of the shares of its subsidiary NAMISA. 11,812,071 11,073,961 Assessment Notice and Imposition of fine (AIIM) - Income tax/ Social contribution - gloss of goodwill deductions generated by the reverse merger of Big Jump by NAMISA 3,722,888 2,623,179 Assessment Notice and Imposition of fine (AIIM) - Income tax/ Social contribution - gloss of interest on prepayment arising from supply contracts of iron ore and port 2,165,088 2,500,606 Notices of violation and imposition of fine - Income taxes and social contribution due to profits from foreign subsidiaries (years 2008,2010 and 2011) (1) 1,891,149 1,858,640 Tax foreclosures - ICMS - Electricity credits 974,479 920,306 Installment MP 470 - Insufficient impairment of tax loss and negative basis (1) 704,739 Offset of taxes that were not approved by the Federal Revenue Service - IRPJ/CSLL, PIS/COFINS e IPI 1,481,382 1,685,648 Disallowance of the ICMS credits - Transfer of iron ore 529,607 499,006 ICMS - Refers to the transfer of imported raw material at an amount lower than the price disclosed in the import documentation 294,527 275,233 Disallowance of the tax losses arising on adjustments to the SAPLI 516,583 491,862 Taxes - ICMS - shipment and return of goods for industrialization (2) 816,199 Assessment Notice- Income tax- Capital Gain of CFM vendors located outside 243,007 203,185 CFEM - Divergence on the understanding between CSN and DNPM on the calculation basis 311,582 290,249 Infraction Notice - ICMS - Question on sales to Incentivized Zone 976,438 170,330 Other tax (federal, state, and municipal) lawsuits 3,625,167 3,065,131 Social security lawsuits 287,823 278,600 Law suit applied by Brazilian antitrust authorities (CADE) 101,683 98,189 Other civil lawsuits 922,171 1,111,944 Labor and social security lawsuits 1,537,078 1,569,712 Environmental process - ACP TAC / PAC - Compliance with environmental obligations (3) 216,878 Tax Enforcement Fine Volta Grande IV (4) 75,530 67,620 Others Enviromental lawsuits 144,235 117,858 31,612,488 30,639,075

18. PROVISION FOR ENVIRONMENT_2

18. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Tables)	12 Months Ended
	Dec. 31, 2018
Provision For Environmental Liabilities And Asset Retirement Obligations Tables Abstract
Provision for environmental liabilities and asset retirement obligation	Consolidated 12/31/2018 12/31/2017 Environmental liabilities 198,386 255,517 Asset retirement obligations 83,380 81,496 281,766 337,013

19. RELATED-PARTY BALANCES AN_2

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Tables)	12 Months Ended
	Dec. 31, 2018
Relatedparty Balances And Transactions Tables Abstract
Proposed dividends	Companies Proposed Dividends Vicunha Aços 439,913 Rio Iaco Participações S.A. 37,640 Total at 12/31/2018 477,553 Total at 12/31/2017 -
Transactions with subsidiaries, joint ventures, associates, exclusive funds and other related parties, by transaction - assets and liabilities	Consolidated Current Non-current Total 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Assets Trade receivables(note 6) 93,317 115,388 93,317 115,388 Dividends receivable (Note 8) 46,171 41,528 46,171 41,528 Actuarial asset (note 8) 99,894 111,281 99,894 111,281 Financial investments/ investments 92,332 53 92,332 53 Loans (note 8) 2,675 2,441 706,605 554,694 709,280 557,135 Other receivables (note 8) 3,649 3,577 218,840 30,770 222,489 34,347 238,144 162,987 1,025,339 696,745 1,263,483 859,732 Liabilities Other payables (Note 14) Accounts payable 29,286 799 96,629 125,915 799 Provision for consumption and services 6,213 2,298 6,213 2,298 Trade payables 135,801 134,974 135,801 134,974 Actuarial liabilities 7,982 41,937 7,982 41,937 171,300 138,071 104,611 41,937 275,911 180,008
Transactions with subsidiaries, joint ventures, associates, exclusive funds and other related parties, by transaction - statement of income	12/31/2018 12/31/2017 12/31/2016 P&L Revenues Sales 1,278,751 880,145 878,992 Interest (note 25) 64,888 61,549 60,964 Expenses Purchases (1,418,282) (1,176,930) (1,099,851) Interest (note 25) (16,092) (3,185) Foreing exchange and monetary variations, net 13,611 (18,398) (77,124) (235,236) (181,478)
Transactions with subsidiaries, joint ventures, associates, exclusive funds and other related parties, by company - assets and liabilities	Assets Liabilities Current Non-current Total Current Non-current Total Joint-venture and Joint-operation Itá Energética S.A. 2,550 2,550 MRS Logística S.A. 46,243 46,243 101,264 96,629.00 197,893 CBSI - Companhia Brasileira de Serviços e Infraestrutura 3 3 37,362 37,362 Transnordestina Logística S.A (1) 1,611 925,445 927,056 13,652 13,652 47,857 925,445 973,302 154,828 96,629 251,457 Other related parties CBS Previdência 99,894 99,894 7,982 7,982 Banco Fibra (2) 92,334 92,334 Usiminas Panatlântica (3) 53,027 53,027 15,643 15,643 Ibis Participações e Serviços Other related parties 2,092 2,092 829 829 147,453 99,894 247,347 16,472 7,982 24,454 Associates Arvedi Metalfer do Brasil S.A. 42,834 42,834 Total at 12/31/2018 238,144 1,025,339 1,263,483 171,300 104,611 275,911 Total at 12/31/2017 162,987 696,745 859,732 138,071 41,937 180,008
Transactions with subsidiaries, joint ventures, associates, exclusive funds and other related parties, by company - statement of income	Sales Purchases Finance income(expenses), net Exchange rate variations, net Total Joint ventures and Joint Operation MRS Logística S,A, (1,111,695) (16,092) (1,127,787) CBSI - Companhia Brasileira de Serviços e Infraestrutura 47 (180,332) (180,285) Transnordestina Logística S.A. (1) 367 (15,667) 50,003 34,703 414 (1,307,694) 33,911 (1,273,369) Other related parties Banco Fibra (2) 14,651 13,611 28,262 Usiminas (382) (382) Panatlântica (3) 1,174,984 (94,515) 1,080,469 Ibis Participações e Serviços (4,501) (4,501) Other related parties 2,745 (11,190) (8,445) 1,177,729 (110,588) 14,651 13,611 1,095,403 Associates Arvedi Metalfer do Brasil S,A, 100,608 234 100,842 Discontinued Operation Cia Metalic Nordeste Total 1,278,751 (1,418,282) 48,796 13,611 (77,124) 12/31/2017 Sales Purchases Finance income(expenses), net Total Joint ventures and Joint Operation Itá Energética S.A (32,275) (32,275) MRS Logística S.A. (934,279) (934,279) CBSI - Companhia Brasileira de Serviços e Infraestrutura 55 (150,758) (150,703) Transnordestina Logística S.A. (1) 2,549 (7,916) 53,261 47,894 2,604 (1,125,228) 53,261 (1,069,363) Other related parties Fundação CSN 13 (1,118) (1,105) Banco Fibra (2) 6,290 6,290 Usiminas (427) (427) Panatlântica (3) 872,047 (43,949) 828,098 Ibis Participações e Serviços (5,915) (5,915) Other related parties 2,821 (293) 2,528 874,881 (51,702) 6,290 829,469 Associates Arvedi Metalfer do Brasil S,A, 2,660 1,998 4,658 Discontinued Operation Cia Metalic Nordeste Total 880,145 (1,176,930) 61,549 (235,236)
Key management personnel compensation	12/31/2018 12/31/2017 12/31/2016 P&L Short-term benefits for employees and officers 32,848 39,721 71,852 Post-employment benefits 105 110 306 32,953 39,831 72,158

20. SHAREHOLDERS' EQUITY (Table

20. SHAREHOLDERS' EQUITY (Tables)	12 Months Ended
	Dec. 31, 2018
Shareholders Equity Tables Abstract
Ownership structure	12/31/2018 12/31/2017 Number of common shares % of total shares % of voting capital Number of common shares % of total shares % of voting capital Vicunha Aços S.A. (*) 679,522,254 48.97% 49.24% 682,855,454 49.21% 50.32% Rio Iaco Participações S.A. (*) 58,193,503 4.19% 4.22% 58,193,503 4.19% 4.29% NYSE (ADRs) 284,152,319 20.48% 20.59% 303,590,364 21.88% 22.37% Other shareholders 358,246,471 25.82% 25.95% 312,493,726 22.52% 23.02% Total shares outstanding 1,380,114,547 99.47% 100.00% 1,357,133,047 97.81% 100.00% Treasury shares 7,409,500 0.53% 30,391,000 2.19% Total shares 1,387,524,047 100.00% 1,387,524,047 100.00%
Share buyback programs	Program Board’s Authorization Authorized quantity Program period Average buyback price Minimum and maximum buyback price Number bought back Share cancelation Disposal of shares Balance in treasury 1º 3/13/2014 70,205,661 From 3/14/2014 to 4/14/2014 R$ 9.34 R$ 9,22 and R$ 9,45 2,350,000 2,350,000 2º 4/15/2014 67,855,661 From 4/16/2014 to 5/23/2014 R$ 8.97 R$ 8,70 and R$ 9,48 9,529,500 11,879,500 3º 5/23/2014 58,326,161 From 5/26/2014 to 6/25/2014 R$ 9.21 R$ 8,61 and R$ 9,72 31,544,500 43,424,000 4º 6/26/2014 26,781,661 From 6/26/2014 to 7/17/2014 R$ 10.42 R$ 9,33 and R$ 11,54 26,781,661 70,205,661 7/18/2014 Not applicable Not applicable 60,000,000 (1) 10,205,661 5º 7/18/2014 64,205,661 From 7/18/2014 to 8/18/2014 R$ 11.40 R$ 11.40 240,400 10,446,061 8/18/2014 Not applicable Not applicable 10,446,061 (1) 6º 8/18/2014 63,161,055 From 8/19/2014 to 9/25/2014 R$ 9.82 R$ 9,47 and R$ 10,07 6,791,300 6,791,300 7º 9/29/2014 56,369,755 From 9/29/2014 to 2/29/2014 R$ 7.49 R$ 4,48 and R$ 9,16 21,758,600 28,549,900 8º 12/30/2014 34,611,155 From 12/31/2014 to 3/31/2015 R$ 5.10 R$ 4,90 and R$ 5,39 1,841,100 30,391,000 9º (*) 03/31/2015 32,770,055 From 4/01/2015 to 6/30/2015 30,391,000 04/20/2018 30,391,000 From 4/20/2018 to 4/30/2018 Não aplicável Não aplicável R$ 0.00 R$ 0.00 22,981,500 (2) 7,409,500
Position of treasury shares	Quantity purchased (Units) Amount paid for the shares Share price Market value of shares in 12/31/2018 (*) Minimum Maximum Average 7,409,500 R$ 58,264 R$ 4.48 R$ 10.07 R$ 7.86 R$ 65,500
Basic earnings (loss) per share	12/31/2018 12/31/2017 12/31/2016 Common Shares (Loss) profit for the year Continued operations 5,074,136 10,272 (925,186) Discontinued operations - - (9,561) 5,074,136 10,272 (934,747) Weighted average number of shares 1,373,250,595 1,357,133,047 1,357,133,047 Basic and diluted EPS Continued Operations 3.69498 0.00757 (0.68172) Discontinued Operations - - (0.00704) 3.69498 0.00757 (0.68876)

21. PAYMENT TO SHAREHOLDERS (Ta

21. PAYMENT TO SHAREHOLDERS (Tables)	12 Months Ended
	Dec. 31, 2018
Payment To Shareholders Tables Abstract
Deliberate and paid dividends	Allocation of profits 12/31/2018 Profit for the year 5,074,136 Absorption of deficits (1,291,689) Legal reserve (189,122) Allocation of profits 3,593,325 Proposed destination: Mandatory minimum dividends (898,332) Intended for statutory reserve of working capital (2,694,993) In current liabilities Dividends to be paid on December 31, 2017 2,209 Mandatory minimum dividends 898,332 Dividends to be paid on December 31, 2018 900,541 Weighted average number of shares 1,373,251 Dividends per share approved 0.65416 Approval Year Dividends Payment Year Dividends 2017 (*) 0,00 2017 0,00 2018 898,332 2018 0,00 Total approved 898,332 Total paid

22. NET SALES AND SERVICES RE_2

22. NET SALES AND SERVICES REVENUE (Tables)	12 Months Ended
	Dec. 31, 2018
Net Sales And Services Revenue Tables Abstract
Net sales and services revenue	Consolidated 12/31/2018 12/31/2017 12/31/2016 Gross revenue Domestic market 14,752,901 11,487,011 10,206,195 Foreign market 11,817,559 9,980,572 9,571,630 26,570,460 21,467,583 19,777,825 Deductions Canceled sales, discounts and rebates (234,851) (262,989) (190,415) Taxes on sales (3,366,724) (2,679,993) (2,438,461) (3,601,575) (2,942,982) (2,628,876) Net revenue 22,968,885 18,524,601 17,148,949

23. EXPENSES BY NATURE (Tables)

23. EXPENSES BY NATURE (Tables)	12 Months Ended
	Dec. 31, 2018
Expenses By Nature Tables Abstract
Expenses by nature	Consolidated 12/31/2018 12/31/2017 12/31/2016 Raw materials and inputs (6,759,275) (5,404,801) (4,518,718) Labor cost (2,743,460) (2,400,579) (2,482,111) Supplies (1,782,576) (1,451,437) (1,384,437) Maintenance cost (services and materials) (1,326,894) (1,145,974) (1,203,294) Outsourcing services (2,368,387) (2,062,352) (2,228,786) Freights (1,802,541) (1,362,087) (1,263,734) Depreciation, Amortization and depletion (Note 10,11, and 26) (1.175.107) (1,408,765) (1,278,816) Others (905,128) (591,094) (495,274) (18,863,368) (15,827,089) (14,855,170) Classified as: Cost of sales (16,105,657) (13,596,141) (12,640,042) Selling expenses (2,263,688) (1,815,107) (1,696,896) General and administrative expenses (494,023) (415,841) (518,232) (18,863,368) (15,827,089) (14,855,170)
Depreciation, amortization and depletion	ConsColi Consolidated 12/31/2018 12/31/2017 12/31/2016 Production costs 1,145,793 1,376,862 1,241,425 Sales expenses 5,850 8,851 9,163 General and Administrative Expenses 23,464 23,052 28,228 1,175,107 1,408,765 1,278,816 Other operating expenses (*) 97,914 44,570 43,681 1,273,021 1,453,335 1,322,497

24. OTHER OPERATING INCOME (E_2

24. OTHER OPERATING INCOME (EXPENSES) (Tables)	12 Months Ended
	Dec. 31, 2018
Other Operating Income Expenses
Other operating income (expenses)	Co Consolidated solidado 12/31/2018 12/31/2017 12/31/2016 Other operating income Indemnities 46,256 6,106 26,871 Rentals and leases 5,430 1,841 1,483 Dividends received 9,188 3,248 567 PIS and COFINS to compensate (1) 1,102,365 Extemporaneous PIS/COFINS credits 203,504 Contractual fines 3,965 2,970 2,501 Gain on business combination 66,496 Actuarial pension plan 20,983 36,952 48,790 Gain ons sale of assets held for sale 252,023 Updated shares – Fair Value through profit or loss (VJR) (Note 13) 1,655,813 Eletrobrás's compulsory loan (3) 755,151 Gain on sale of LLC (note 3) 1,164,294 Debts write off - intragroup Other revenues 27,749 18,018 61,274 4,036,043 824,286 663,509 Other operating expenses Taxes and fees (26,197) (136,348) (88,249) Write-off/(Provision) of judicial deposits (54,330) (38,258) (64,886) Expenses with environmental liabilities, net (60,311) (7,156) (5,023) Expenses from tax, social security, labor, civil and environmental lawsuits, net (59,219) (95,744) (151,534) Contractual fines (2) (104,086) (16,624) Depreciation of equipment paralyzed and amortization of intangible assets (note 23) (97,914) (44,570) (43,681) Write- off of PP&E and intangible assets (notes 10 and 11) (27,260) (28,127) (88,339) Estimated (Loss)/reversal in inventories (149,704) (15,775) (29,316) Studies and project engineering expenses (33,738) (32,956) (31,156) Research and development expenses (2,688) (3,944) (2,269) Advisory expenses (508) (3,419) (20,865) Healthcare plan expenses (108,369) (97,837) (80,489) Reversal/(Provision) industrial reestructuring (17,490) 5,807 96,390 Cash flow hedge realized (Note 13 b) (370,191) (92,140) (77,444) Impairment of fair value of Transnordestina (387,989) Other expenses (218,701) (56,477) (85,256) (1,330,706) (646,944) (1,076,730) Other operating income (expenses), net 2,705,337 177,342 (413,221) (1) Refers to non-inclusion of ICMS in the PIS and COFINS calculation basis, see note nº8. (2) In 2018, refers to the contractual amendment with the jointly-owned subsidiary MRS, for the revision of the “Anual Transportation Plan”. (3) This is a net amount, certain and due, arising from the final judicial decision favorable to the Company, which is irreversible and irrevocable, in order to apply the STJ's consolidated position on the subject, which culminated in sentencing the Eletrobrás to the payment of the correct interest and monetary correction of the Compulsory Loan. The final judicial decision, as well as the certainty about the amounts involved in the settlement of the judgment (judicial procedure to request the satisfaction of the right), allowed the conclusion that the right to receive this value is certain. Thus, in line with our legal and accounting advisors, we recognize the credits in noncurrent assets against the result of Other Operating Revenues. The monetary adjustment of 2018 is presented in the note nº25 - Financial Income (Expenses).

25. FINANCIAL INCOME (EXPENSE_2

25. FINANCIAL INCOME (EXPENSES) (Tables)	12 Months Ended
	Dec. 31, 2018
Financial Income Expenses
Financial income (expenses)	Consolidated 12/31/2018 12/31/2017 12/31/2016 Financial income Related parties (note 19 b) 64,888 61,549 60,964 Income from financial investments 111,235 162,292 301,401 Gain from derivative 28,503 5,829 Gain on repurchase of debt securities 146,214 Other income (1) 1,134,391 42,730 129,182 1,310,514 295,074 643,590 Financial expenses Borrowings and financing - foreign currency (988,821) (827,841) (930,508) Borrowings and financing - local currency (1,020,867) (1,610,714) (2,229,849) Related parties (note 19 b) (16,092) (3,185) Capitalized interest (notes 10 and 30) 71,611 91,957 215,794 Losses on derivatives (362) Interest, fines and late payment charges (71,100) (72,343) (38,002) Commission and bank fees (182,179) (159,088) (155,249) PIS/COFINS over financial income (84,404) (21,926) (39,154) Other financial expenses 19,614 (142,296) (102,450) (2,272,238) (2,742,251) (3,282,965) Inflation adjustment and exchange differences, net Inflation adjustments, net (1,035) (10,556) 7,865 Exchange rates, net (532,883) (5,665) 921,310 Exchange gain (losses) on derivatives (1) (229) (812,227) (533,919) (16,450) 116,948 Financial income (expenses), net (1,495,643) (2,463,627) (2,522,427) Statement of gains and (losses) on derivative transactions Future Dollar (805,760) Dollar - to - euro swap (1) (229) (6,467) (1) (229) (812,227) Swap Pré x CDI (299) Swap CDI x Pré (63) Future DI 28,503 5,829 28,503 5,467 (1) 28,274 (806,760)

26. SEGMENT INFORMATION (Tables

26. SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Information Tables Abstract
Consolidated results	12/31/2018 P&L Steel Mining Logistics Energy Cement Corporate expenses/elimination Consolidated Port Railroads Metric tons (thou.) (*) 5,068,758 34,780,756 (4,961,345) Net revenues Domestic market 10,328,372 972,360 266,378 1,506,114 410,606 588,230 (2,718,623) 11,353,437 Foreign market 5,305,771 5,012,421 1,297,256 11,615,448 Total net revenue (note 22) 15,634,143 5,984,781 266,378 1,506,114 410,606 588,230 (1,421,367) 22,968,885 Cost of sales and services (12,613,216) (3,585,691) (189,999) (1,049,071) (286,734) (544,266) 2,163,320 (16,105,657) Gross profit 3,020,927 2,399,090 76,379 457,043 123,872 43,964 741,953 6,863,228 General and administrative expenses (984,980) (144,754) (35,423) (106,412) (27,948) (95,893) (1,362,301) (2,757,711) Depreciation (note 23) 609,274 366,547 20,368 258,985 17,285 115,411 (212,763) 1,175,107 Proportionate EBITDA of joint ventures 568,045 568,045 Adjusted EBITDA 2,645,221 2,620,883 61,324 609,616 113,209 63,482 (265,066) 5,848,669 Sales by geographic area Asia 40,681 4,422,377 1,297,256 5,760,314 North America 1,506,041 1,506,041 Latin America 369,830 369,830 Europe 3,330,991 590,044 3,921,035 Others 58,228 58,228 Foreign market 5,305,771 5,012,421 1,297,256 11,615,448 Domestic market 10,328,372 972,360 266,378 1,506,114 410,606 588,230 (2,718,623) 11,353,437 Total 15,634,143 5,984,781 266,378 1,506,114 410,606 588,230 (1,421,367) 22,968,885 12/31/2017 P&L Steel Mining Logistics Energy Cement Corporate expenses/elimination Consolidated Port Railroads Metric tons (thou.) (*) 4,921,719 32,576,843 (5,359,571) Net revenues Domestic market 7,818,552 829,268 238,240 1,416,612 407,671 487,129 (2,491,006) 8,706,466 Foreign market 5,140,471 3,791,703 885,961 9,818,135 Total net revenue (note 22) 12,959,023 4,620,971 238,240 1,416,612 407,671 487,129 (1,605,045) 18,524,601 Cost of sales and services (10,537,547) (3,005,840) (156,997) (1,024,696) (285,085) (512,762) 1,926,786 (13,596,141) Gross profit 2,421,476 1,615,131 81,243 391,916 122,586 (25,633) 321,741 4,928,460 General and administrative expenses (963,822) (158,958) (27,943) (94,921) (27,098) (80,823) (877,383) (2,230,948) Depreciation (note 23) 658,587 490,805 15,752 294,571 17,265 121,801 (190,016) 1,408,765 Proportionate EBITDA of joint ventures 538,170 538,170 Adjusted EBITDA 2,116,241 1,946,978 69,052 591,566 112,753 15,345 (207,488) 4,644,447 Sales by geographic area Asia 23,364 3,592,226 885,961 4,501,551 North America 2,009,337 2,009,337 Latin America 506,951 506,951 Europe 2,564,823 197,701 2,762,524 Others 35,996 1,776 37,772 Foreign market 5,140,471 3,791,703 885,961 9,818,135 Domestic market 7,818,552 829,268 238,240 1,416,612 407,671 487,129 (2,491,006) 8,706,466 Total 12,959,023 4,620,971 238,240 1,416,612 407,671 487,129 (1,605,045) 18,524,601 12/31/2016 P&L Steel Mining Logistics Energy Cement Corporate expenses/elimination Consolidated Port Railroads Metric tons (Thou) (*) 4,857,174 36,983,297 (4,062,774) Net revenues Domestic market 6,980,087 542,028 207,722 1,319,907 269,095 490,608 (2,079,534) 7,729,913 Foreign market 4,535,821 4,039,875 843,340 9,419,036 Total Net Revenue (note 22) 11,515,908 4,581,903 207,722 1,319,907 269,095 490,608 (1,236,194) 17,148,949 Cost of sales and services (9,393,237) (3,099,236) (141,542) (914,361) (195,994) (467,373) 1,571,701 (12,640,042) Gross profit 2,122,671 1,482,667 66,180 405,546 73,101 23,235 335,507 4,508,907 General and administrative expenses (914,927) (185,149) (25,180) (83,020) (25,196) (74,528) (907,128) (2,215,128) Depreciation (note 23) 679,074 461,287 13,430 227,792 17,140 73,030 (192,937) 1,278,816 Proportionate EBITDA of joint ventures 502,345 502,345 Adjusted EBITDA 1,886,818 1,758,805 54,430 550,318 65,045 21,737 (262,213) 4,074,940 Sales by geographic area Asia 30,815 3,519,713 843,340 4,393,868 North America 1,891,865 1,891,865 Latin America 259,640 259,640 Europe 2,324,580 434,378 2,758,958 Others 28,921 85,784 114,705 Foreign market 4,535,821 4,039,875 843,340 9,419,036 Domestic market 6,980,087 542,028 207,722 1,319,907 269,095 490,608 (2,079,534) 7,729,913 Total 11,515,908 4,581,903 207,722 1,319,907 269,095 490,608 (1,236,194) 17,148,949 (*) The ore sales volumes presented in this note take into consideration Company sales and the interest in its subsidiaries and joint ventures.
EBITDA and Adjusted EBITDA	12/31/2018 12/31/2017 12/31/2016 Net income / (loss) for the year 5,200,583 111,229 (853,058) Result from discontinued operations 9,561 Depreciation / amortization / depletion (note 23) 1,175,107 1,408,765 1,278,816 Income tax and social contribution (note 15) 250,334 409,109 266,546 Financial income / (expenses) (note 25) 1,495,643 2,463,627 2,522,427 EBITDA 8,121,667 4,392,730 3,224,292 Other operating (income) / expenses (note 24) (2,705,337) (177,342) 413,221 Equity in results of affiliated companies (135,706) (109,111) (64,918) Proportionate EBITDA of joint ventures 568,045 538,170 502,345 Adjusted EBITDA (*) 5,848,669 4,644,447 4,074,940

27. EMPLOYEE BENEFITS (Tables)

27. EMPLOYEE BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2018
Employee Benefits Tables Abstract
Actuarial employee benefit assets and liabilities	Consolidated 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Actuarial asset Actuarial liabilities Benefits of pension plans (99,894) (111,281) 7,982 41,937 Post-employment healthcare benefits - - 897,137 866,784 (99,894) (111,281) 905,119 908,721
Reconciliation of employee benefits' assets and liabilities	12/31/2018 12/31/2017 Present value of defined benefit obligation 3,087,433 3,077,849 Fair value of plan assets (3,403,906) (3,305,356) Deficit(Surplus) (316,473) (227,507) Restriction to actuarial assets due to recovery limitation 224,561 158,163 Liabilities (Assets), net (91,912) (69,344) Liabilities 7,982 41,937 Assets (99,894) (111,281) Net (assets) recognized in the balance sheet (91,912) (69,344)
Changes in present value of the defined benefit obligation	12/31/2018 12/31/2017 Present value of obligations at the beginning of the year 3,077,849 2,872,442 Cost of service 1,169 1,285 Interest cost 304,132 322,359 Benefits paid (280,493) (284,777) Actuarial loss/(gain) (15,224) 166,540 Present value of obligations at the end of the year 3,087,433 3,077,849
Changes in fair value of the plan assets	12/31/2018 12/31/2017 Fair value of plan assets at the beginning of the year (3,305,356) (3,193,493) Interest income (327,830) (360,013) Benefits Paid 280,493 284,777 Return on plan assets (less interest income) (51,213) (36,627) Fair value of plan assets at the end of the year (3,403,906) (3,305,356)
Employee benefits recognized in the income statement	12/31/2018 12/31/2017 12/31/2016 Cost of current service 1,169 1,285 1,244 Interest cost 304,132 322,359 311,361 Expected return on plan assets (327,830) (360,013) (345,521) Interest on the asset ceiling effect 16,340 26,843 22,189 (6,189) (9,526) (10,727) Total unrecognized costs / (income) (*) - 6 7 Total costs / (income) recognized in the income statement (6,189) (9,532) (10,734) Total costs / (income), net (*) (6,189) (9.526) (10,727)
Changes in actuarial gains and losses	12/31/2018 12/31/2017 12/31/2016 Actuarial losses and (gains) (15,224) 166,540 393,743 Return on plan assets (less interest income) (51,213) (36,627) (427,523) Change in the asset’s limit (excluding interest income) 50,058 (97,882) 41,796 (16,379) 32,031 8,016 Actuarial losses and (gains) recognized in other comprehensive income (16,379) 32,037 8,023 Unrecognized actuarial (gains) - (6) (7) Total cost of actuarial losses and (gains) (*) (16,379) 32,031 8,016
Breakdown of actuarial gains or losses	12/31/2018 Loss due to change in demographic assumptions (139,813) Loss due to change in financial assumptions 46,917 Loss due to experience adjustments 77,672 Return on plan assets (less interest income) (51,213) Change in asset limit (excluding interest income) 50,058 Actuarial losses and (gains) (16.379)
Actuarial assumptions used	12/31/2018 12/31/2017 Actuarial financing method Projected unit credit Projected unit credit Functional currency Real (R$) Real (R$) Recognition of plan assets Fair value Fair value Nominal discount rate Millennium Plan: 9.69% Plan 35%: 9.60% Supplementation: 9.59% Millennium Plan: 10.42% Plan 35%: 10.30% Supplementation: 10.32% Inflation rate 4.75% 5.00% Nominal salary increase rate 5.80% 6.05% Nominal benefit increase rate 4.75% 5.00% Rate of return on investments Millennium Plan: 9.69% Millennium Plan: 10.42% Plan 35%: 9.60% Supplementation: 9.59% Plan 35%: 10.30% Supplementation: 10.32% General mortality table Millennium Plan: AT-2000 smoothed down by 10% segregated by gender. Plans 35%: AT-2000 Male aggravated by 15%. Supplementation: AT-2000 aggravated by 10% segregated by gender. Millennium Plan, Plans 35% and Supplementation of Average Salary: AT 2000 segregated by gender (10% smoothed) Disability table 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement) 35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement) Disability mortality table Winklevoss - 1% Winklevoss - 1% Turnover table Millenium plan 5% per annum, zero for plans 35% and Supplementation. Millenium plan 5% per annum, zero for plans 35% and Supplementation. Retirement age 100% on the first date he/she becomes eligible for programmed retirement benefit under the plan 100% on the first date he/she becomes eligible for programmed retirement benefit under the plan Household composition of active participants 95% will be married at the time of retirement, with the wife being 4 years younger than the husband 95% will be married at the time of retirement, with the wife being 4 years younger than the husband
Average life expectancy	Plan covering 35% of the average salary Average salary supplementation plan Mixed supplementary benefit plan (Milênio Plan) 12/31/2018 12/31/2017 12/31/2018 12/31/2017 12/31/2018 12/31/2017 Longevity at age of 65 for current participants Male 18.00 21.00 18.74 20.45 21.00 21.00 Female 18.00 23.00 22.23 23.02 23.00 23.00 Longevity at age of 65 for current participants who are 40 Male 40.00 43.00 40.60 42.69 43.00 43.00 Female 40.00 47.00 45.37 46.29 47.00 47.00
Allocation of plan assets	12/31/2018 12/31/2017 Variable income 141,705 4,16% 50,966 1,54% Fixed income 3,050,099 89,61% 3,085,783 93,36% Real estate 52,091 1,53% 44,083 1,33% Others 160,011 4,70% 124,524 3,77% Total 3,403,906 100,00% 3,305,356 100,00%
Quantitative sensitivity analysis regarding the significant assumptions for the pension plans	12/31/2018 Plan covering 35% of the average salary Average salary supplementation plan Mixed supplementary benefit plan (Milênio Plan) Assumption: Discount rate Sensitivity level 0.5% -0.5% 0.5% -0.5% 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 409 (458) 1,650 (1,897) (502) 316 Effect on present value of obligations (13,281) 15,342 (70,755) 76,222 (50,666) 54,396 Assumption: Salary growth Sensitivity level 0.5% -0.5% 0.5% -0.5% 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 252 (223) Effect on present value of obligations 2,028 (1,792) Assumption: Benefit adjustment Sensitivity level 0.5% -0.5% 0.5% -0.5% 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 1,439 (1,350) 7,578 (7,079) 5,720 (5,232) Effect on present value of obligations 14,685 (13,778) 79,305 (74,101) 57,166 (52,366) Assumption: Mortality table Sensitivity level 1.0% -1.0% 1.0% -1.0% 1.0% -1.0% Effect on current service cost and on interest on actuarial obligations (1,052) 1,054 (4,877) 4,845 (1,120) 1,128 Effect on present value of obligations (10,680) 10,706 (50,807) 50,468 (12,179) 12,165
Forecast benefit payments of the defined benefit plans	Payments 2018 Year 1 244,606 Year 2 252,778 Year 3 269,332 Year 4 265,261 Year 5 271,570 Next 5 years 1,436,738 Total forecast payments 2,740,285
Post-employment health care plan amounts	12/31/2018 12/31/2017 Present value of obligations 897,137 866,784 Liabilities 897,137 866,784
Reconciliation of the healthcare liabilities	12/31/2018 12/31/2017 Actuarial liability at the beginning of the year 866,784 691,262 Expenses recognized in income for the year 85,748 77,269 Sponsor's contributions transferred in prior year (71,632) (72,192) Recognition of actuarial loss/ (gain) 16,237 170,445 Actuarial liability at the end of the year 897,137 866,784
Actuarial gains and losses recognized in shareholders' equity	12/31/2018 12/31/2017 12/31/2016 Actuarial gain /(loss) on obligation 16,237 170,445 210,257 Gain/(loss) recognized in shareholders' equity 16,237 170,445 210,257
Weighted average life expectancy	12/31/2018 12/31/2017 Longevity at age of 65 for current participants Male 19.55 19.55 Female 22.17 22.17 Longevity at age of 65 for current participants who are 40 Male 41.59 41.59 Female 45.30 45.30
Actuarial assumptions used for calculating postemployment healthcare benefits	12/31/2018 12/31/2017 Biometric and Demographic General mortality table AT 2000 segregated by gender AT 2000 segregated by gender Financial Actuarial nominal discount rate 9.62% 10.34% Inflation 4.75% 5.00% Real increase in medical costs based on age (Aging Factor) 0.5% - 3.00% real a.a. 0.5% - 3.00% real a.a. Nominal increase medical costs growth rate 8.15% 8.41% Average medical cost (Claim cost) 1,054.65 1,001.69
Quantitative sensitivity analysis regarding the significant assumptions for the postemployment healthcare plans	12/31/2018 Healthcare Plan Assumption: Discount rate Sensitivity level 0.5% -0.5% Effect on current service cost and on interest on actuarial obligations 909 (992) Effect on present value of obligations (35,530) 38,727 Assumption: Medical Inflation Sensitivity level 1.0% -1.0% Effect on current service cost and on interest on actuarial obligations 8,091 (6,925) Effect on present value of obligations 84,560 (72,369) Assumption: Mortality table Sensitivity level 1.0% -1.0% Effect on current service cost and on interest on actuarial obligations (2,161) 2,148 Effect on present value of obligations (22,582) 22,451
Forecast benefit payments of the postemployment healthcare plans	Forecast benefit payments 2018 Year 1 78,100 Year 2 80,787 Year 3 83,232 Year 4 85,386 Year 5 87,224 Next 5 years 450,767 Total forecast payments 865,496

28. COMMITMENTS (Tables)

28. COMMITMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments Tables Abstract
Take-or-pay contracts	Payments in the period Type of service 2017 2018 2019 2020 2021 After 2021 Total Transportation of iron ore, coal, coke, steel products, cement and mining products. 957,373 406,920 1,024,674 962,399 831,166 3,761,232 6,579,471 Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets, coal and clinquer. 563,743 658,166 453,801 40,780 8,419 503,000 Processing of furnace sludge and slag resulting from the production process of pig iron and steel. 8,880 9,467 7,074 7,074 7,074 8,842 30,064 Manufacturing, repair, recovery and production of ingot casting machine units. 52,103 21,533 7,968 3,246 3,246 5,952 20,412 1,582,099 1,096,086 1,493,517 1,013,499 849,905 3,776,026 7,132,947
Minimum future payments related to government concessions	Company / Concession Type of service 2019 2020 2021 After 2021 Total FTL (Ferrovia Transnordestina Logística) 30 - year concession granted on December 31,1997, renewable for another 30 years, to develop public service and operating the railway system in northeastern Brazil.The northeastern railway system covers 4.238 Kilometers of railway network and operates in Maranhão, Piauí, Ceará, Paraíba, Pernambuco, Alagoas and Rio Grande do Norte. 9,396 9,396 9,396 50,895 79,083 CSN Mineração S.A. Concession to operate the TECAR a solid bulk terminal, one of the four terminals that make up the Port of Itaguai, located in Rio de Janeiro. The concession was renewed and the agreement expires in 2047. 133,021 133,021 133,021 3,458,541 3,857,604 Tecon 25-year concession started in July 2001. On May 10, 2017, was approved the Decree nº 9,048, which changes de concession extension period for port operations. It was established that the requested extension period, added to the initial period, cannot exceed 70 years 33,779 35,176 36,638 175,053 280,646 176,196 177,593 179,055 3,684,489 4,217,333

30. ADDITIONAL INFORMATION TO_2

30. ADDITIONAL INFORMATION TO CASH FLOWS (Tables)	12 Months Ended
	Dec. 31, 2018
Additional Information To Cash Flows Tables Abstract
Additional information related to statement of cash flows	Consolidated 12/31/2018 12/31/2017 12/31/2016 Income tax and social contribution paid 336,962 268,847 456,227 Addition to PP&E with interest capitalization (note 10 and 25) 71,611 91,957 215,794 Acquisition of fixed assets through loans 10,792 4,265 7,437 Non-monetary transaction with joint venture 20,264 419,365 385,333 679,458

2. SUMMARY OF SIGNIFICANT ACC_4

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Direct | Subsidiary 1 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Islands VII Corp.	CSN Islands VII Corp.
Interest in subsidiaries	100.00%	100.00%
Core business	Financial transactions	Financial transactions
Direct | Subsidiary 2 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Islands IX Corp. (1)	CSN Islands XI Corp.
Interest in subsidiaries		100.00%
Core business	Financial transactions	Financial transactions
Direct | Subsidiary 3 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Islands X Corp. (1)	CSN Islands XII Corp.
Interest in subsidiaries		100.00%
Core business	Financial transactions	Financial transactions
Direct | Subsidiary 4 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Islands XI Corp.	CSN Minerals S.L.U.
Interest in subsidiaries	100.00%	100.00%
Core business	Financial transactions	Equity interests
Direct | Subsidiary 5 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Islands XII Corp.	CSN Export Europe, S.L.U.
Interest in subsidiaries	100.00%	100.00%
Core business	Financial transactions	Financial transactions and Equity interests
Direct | Subsidiary 6 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Minerals S.L.U. (1)	CSN Metals S.L.U.
Interest in subsidiaries		100.00%
Core business	Equity interests	Equity interests and Financial transactions
Direct | Subsidiary 7 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Export Europe, S.L.U. (1)	CSN Americas S.L.U.
Interest in subsidiaries		100.00%
Core business	Financial transactions and Equity interests	Equity interests and Financial transactions
Direct | Subsidiary 8 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Metals S.L.U. (1)	CSN Steel S.L.U.
Interest in subsidiaries		100.00%
Core business	Equity interests and Financial transactions	Equity interests and Financial transactions
Direct | Subsidiary 9 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Americas S.L.U. (1)	TdBB S.A
Interest in subsidiaries		100.00%
Core business	Equity interests and Financial transactions	Equity interests
Direct | Subsidiary 10 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Steel S.L.U.	Sepetiba Tecon S.A.
Interest in subsidiaries	100.00%	99.99%
Core business	Equity interests and Financial transactions	Port services
Direct | Subsidiary 11 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	TdBB S.A (*)	Minérios Nacional S.A.
Interest in subsidiaries	100.00%	99.99%
Core business	Equity interests	Mining and Equity interests
Direct | Subsidiary 12 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Sepetiba Tecon S.A.	Companhia Florestal do Brasil
Interest in subsidiaries	99.99%	99.99%
Core business	Port services	Reforestation
Direct | Subsidiary 13 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Minérios Nacional S.A.	Estanho de Rondônia S.A.
Interest in subsidiaries	99.99%	99.99%
Core business	Mining and Equity interests	Tin Mining
Direct | Subsidiary 14 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Companhia Florestal do Brasil	Companhia Metalúrgica Prada
Interest in subsidiaries	99.99%	99.99%
Core business	Reforestation	Manufacture of containers and distribution of steel products
Direct | Subsidiary 15 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Estanho de Rondônia S.A.	CSN Gestão de Recursos Financeiros Ltda.
Interest in subsidiaries	99.99%	99.99%
Core business	Tin Mining	Management of funds and securities portfolio
Direct | Subsidiary 16 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Companhia Metalúrgica Prada	CSN Mineração S.A.
Interest in subsidiaries	99.99%	87.52%
Core business	Manufacture of containers and distribution of steel products	Mining and Equity interests
Direct | Subsidiary 17 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Gestão de Recursos Financeiros Ltda. (*)	CSN Energia S.A.
Interest in subsidiaries	99.99%	99.99%
Core business	Management of funds and securities portfolio	Sale of electric power
Direct | Subsidiary 18 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Mineração S.A.	FTL - Ferrovia Transnordestina Logística S.A.
Interest in subsidiaries	87.52%	90.78%
Core business	Mining and Equity interests	Railroad logistics
Direct | Subsidiary 19 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Energia S.A.	Nordeste Logística S.A.
Interest in subsidiaries	99.99%	99.99%
Core business	Sale of electric power	Port services
Direct | Subsidiary 20 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	FTL - Ferrovia Transnordestina Logística S.A.	CGPAR - Construção Pesada S.A. (3)
Interest in subsidiaries	91.69%
Core business	Railroad logistics	Mining support services and Equity interests
Direct | Subsidiary 21 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Nordeste Logística S.A.
Interest in subsidiaries	99.99%
Core business	Port services
Direct | Subsidiary 22 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Aceros México CSN (2)
Interest in subsidiaries	0.08%
Core business	Commercial representation, sales of steel and related activities
Direct | Subsidiary 23 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Inova Ltd.(3)
Interest in subsidiaries	100.00%
Core business	Advisory and implementation of new development projects
Direct | Joint Operation 1 | Proportionate Consolidation
Disclosure of subsidiaries [line items]
Joint operations name	Itá Energética S.A.	Itá Energética S.A.
Interest in joint operations	48.75%	48.75%
Core business	Electric power generation	Electric power generation
Direct | Joint Operation 2 | Proportionate Consolidation
Disclosure of subsidiaries [line items]
Joint operations name	Consórcio da Usina Hidrelétrica de Igarapava	Consórcio da Usina Hidrelétrica de Igarapava
Interest in joint operations	17.92%	17.92%
Core business	Electric power consortium	Electric power generation
Direct | Joint Ventures 1 | Equity Method
Disclosure of subsidiaries [line items]
Joint ventures name	MRS Logística S.A.	MRS Logistica S.A.
Interest in joint ventures	18.64%	18.64%
Core business	Railroad transportation	Railroad transportation
Direct | Joint Venture 2 | Equity Method
Disclosure of subsidiaries [line items]
Joint ventures name	Aceros Del Orinoco S.A.	Aceros Del Orinoco S.A.
Interest in joint ventures	31.82%	31.82%
Core business	Dormant company	Dormant company
Direct | Joint Venture 3 | Equity Method
Disclosure of subsidiaries [line items]
Joint ventures name	CBSI - Companhia Brasileira de Serviços de Infraestrutura	CBSI - Companhia Brasileira de Serviços de Infraestrutura
Interest in joint ventures	50.00%	50.00%
Core business	Equity interests and product sales and iron ore	Equity interests and product sales and iron ore
Direct | Joint Venture 4 | Equity Method
Disclosure of subsidiaries [line items]
Joint ventures name	Transnordestina Logística S.A.	Transnordestina Logística S.A.
Interest in joint ventures	46.30%	46.30%
Core business	Railroad logistics	Railroad logistics
Direct | Associate 1 | Equity Method
Disclosure of subsidiaries [line items]
Associates name	Arvedi Metalfer do Brasil S.A.	Arvedi Metalfer do Brasil S.A.
Interest in associates	20.00%	20.00%
Core business	Metallurgy and Equity interests	Metallurgy Equity interests
Indirect | Subsidiary 1 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Companhia Siderúrgica Nacional	Companhia Siderúrgica Nacional LLC
Interest in subsidiaries		100.00%
Core business	Steel	Steel
Indirect | Subsidiary 2 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Lusosider Projectos Siderúrgicos S.A.	CSN Europe Lda.
Interest in subsidiaries
Core business	Equity interests and product sales	Financial transactions, product sales and Equity interests
Indirect | Subsidiary 3 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Lusosider Aços Planos, S. A.	CSN Ibéria Lda.
Interest in subsidiaries
Core business	Steel and Equity interests	Financial transactions, product sales and Equity interests
Indirect | Subsidiary 4 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Resources S.A.	Lusosider Projectos Siderúrgicos S.A.
Interest in subsidiaries		99.94%
Core business	Financial transactions and Equity interests	Equity interests and product sales
Indirect | Subsidiary 5 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Companhia Brasileira de Latas	Lusosider Aços Planos, S. A.
Interest in subsidiaries		99.99%
Core business	Sale of cans and containers in general and Equity interests	Steel and Equity interests
Indirect | Subsidiary 6 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Companhia de Embalagens Metálicas MMSA	CSN Resources S.A.
Interest in subsidiaries		100.00%
Core business	Production and sale of cans and related activities	Financial transactions and Equity interests
Indirect | Subsidiary 7 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Companhia de Embalagens Metálicas - MTM	Companhia Brasileira de Latas
Interest in subsidiaries		99.99%
Core business	Production and sale of cans and related activities	Sale of cans and containers in general and Equity interests
Indirect | Subsidiary 8 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Steel Holdings 1, S.L.U.	Companhia de Embalagens Metálicas MMSA
Interest in subsidiaries		99.67%
Core business	Financial transactions, product sales and Equity interests	Production and sale of cans and related activities
Indirect | Subsidiary 9 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Productos Siderúrgicos S.L.	Companhia de Embalagens Metálicas - MTM
Interest in subsidiaries		99.67%
Core business	Financial transactions, product sales and Equity interests	Production and sale of cans and related activities
Indirect | Subsidiary 10 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	Stalhwerk Thüringen GmbH	CSN Steel Holdings 1, S.L.U.
Interest in subsidiaries		100.00%
Core business	Production and sale of long steel and related activities	Financial transactions, product sales and Equity interests
Indirect | Subsidiary 11 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Steel Sections UK Limited (*)	CSN Productos Siderúrgicos S.L.
Interest in subsidiaries		100.00%
Core business	Sale of long steel	Financial transactions, product sales and Equity interests
Indirect | Subsidiary 12 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Steel Sections Polska Sp.Z.o.o	Stalhwerk Thüringen GmbH
Interest in subsidiaries		100.00%
Core business	Financial transactions, product sales and Equity interests	Production and sale of long steel and related activities
Indirect | Subsidiary 13 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Asia Limited	CSN Steel Sections UK Limited
Interest in subsidiaries		100.00%
Core business	Commercial representation	Sale of long steel
Indirect | Subsidiary 14 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Mining Holding, S.L	CSN Steel Sections Polska Sp.Z.o.o
Interest in subsidiaries		100.00%
Core business	Financial transactions, product sales and Equity interests	Financial transactions, product sales and Equity interests
Indirect | Subsidiary 15 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Mining GmbH	CSN Asia Limited
Interest in subsidiaries		100.00%
Core business	Financial transactions, product sales and Equity interests	Commercial representation
Indirect | Subsidiary 16 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name	CSN Mining Asia Limited (8)	CSN Mining Holding, S.L
Interest in subsidiaries		87.52%
Core business	Commercial representation	Financial transactions, product sales and Equity interests
Indirect | Subsidiary 17 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name		CSN Mining GmbH
Interest in subsidiaries		87.52%
Core business		Financial transactions, product sales and Equity interests
Indirect | Subsidiary 18 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name		CSN Mining Asia Limited
Interest in subsidiaries		87.52%
Core business		Commercial representation
Indirect | Subsidiary 19 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name		Aceros México CSN
Interest in subsidiaries		100.00%
Core business		Commercial representation,sale of steel and related activity
Indirect | Subsidiary 20 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name		Lusosider Ibérica S.A.
Interest in subsidiaries		99.94%
Core business		Steel, commercial and industrial activities and equity interests
Indirect | Subsidiary 21 | Full Consolidation
Disclosure of subsidiaries [line items]
Subsidiary name		CSN Mining Portugal, Unipessoal Lda.
Interest in subsidiaries		87.52%
Core business		Sale and commercial representation
Indirect | Joint Ventures 1 | Equity Method
Disclosure of subsidiaries [line items]
Joint ventures name	MRS Logística S.A.	MRS Logistica S.A.
Interest in joint ventures	16.30%	16.30%
Core business	Railroad transportation	Railroad transportation

2. SUMMARY OF SIGNIFICANT ACC_5

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) - Direct - Full Consolidation	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Exclusive Funds 1
Disclosure of subsidiaries [line items]
Exclusive fund name	Diplic II - Private credit balanced mutual fund	Diplic II - Private credit balanced mutual fund
Interest in exclusive fund	100.00%	100.00%
Core business	Investment fund	Investment fund
Exclusive Funds 2
Disclosure of subsidiaries [line items]
Exclusive fund name	Caixa Vértice - Private credit balanced mutual fund	Caixa Vértice - Private credit balanced mutual fund
Interest in exclusive fund	100.00%	100.00%
Core business	Investment fund	Investment fund
Exclusive Funds 3
Disclosure of subsidiaries [line items]
Exclusive fund name	VR1 - Private credit balanced mutual fund	VR1 – Private Credit balanced mutual fund
Interest in exclusive fund	100.00%	100.00%
Core business	Investment fund	Investment fund

2. SUMMARY OF SIGNIFICANT ACC_6

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Concession 1
Disclosure of detailed information about service concession arrangements [line items]
Concession name	Sepetiba Tecon S.A. (TECON)
Net book value	R$ 347000
Classification in balance sheet	Fixed assets and intangible (Software)
Concession 2
Disclosure of detailed information about service concession arrangements [line items]
Concession name	Tecar (CSN Mineração)
Net book value	R$ 1616000
Classification in balance sheet	Fixed assets and intangible (Software)
Concession 3
Disclosure of detailed information about service concession arrangements [line items]
Concession name	FTL - Ferrovia Transnordestina Logística S.A. (FTL)
Net book value	R$ 227000
Classification in balance sheet	Fixed assets
Concession 4
Disclosure of detailed information about service concession arrangements [line items]
Concession name	Transnordestina logística S.A. (TLSA)
Net book value	R$ 8439000
Classification in balance sheet	Investment

2. SUMMARY OF SIGNIFICANT ACC_7

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3)	12 Months Ended
	Dec. 31, 2018
Standard 1
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Standard	IFRS16 – Leases
Main items introduced by the standard	This new standard defines the principles for recognition, measurement, presentation and disclosure of leases and introduces a single model for the accounting of leases in the balance sheet for the lessees. A lessee recognizes a right of use asset that represents his right to use the leased asset and a lease liability that represents his obligation to make lease payments. Optional exemptions are available for short-term leases and low-value items. For lessors, accounting treatment remains practically the same, with the classification of leases as operating leases or financial leases.
Effective date	Jan. 1, 2019
Standard 2
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Standard	IFRIC 23 – Uncertainty over Income Tax Treatments
Main items introduced by the standard	Can be unclear how tax law applies to a particular transaction or circumstance. This interpretation complements the CPC 32/ IAS 12 – Income Tax, clarify how to reflect the effects of uncertainty over income tax treatments.
Effective date	Jan. 1, 2019
Standard 3
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Standard	The Conceptual framework for financial reporting
Main items introduced by the standard	Review of the Conceptual Framework by establishing a comprehensive set of concepts for guidance on financial performance reporting; better definitions and guidelines, highlighting the definition of a liability; and clarification in relevant areas.
Effective date	Jan. 1, 2020

2. SUMMARY OF SIGNIFICANT ACC_8

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - R$ / $	Dec. 31, 2018	Dec. 31, 2017
BRL/USD
Disclosure of fair value measurement of assets [line items]
Exchange rate	3.8748	3.3080
BRL/EUR
Disclosure of fair value measurement of assets [line items]
Exchange rate	4.4390	3.9693

3. SALE OF FOREIGN SUBSIDIARY_2

3. SALE OF FOREIGN SUBSIDIARY (Details) - BRL (R$) R$ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018
USD
SaleOfForeignSubsidiaryLineItems [Line Items]
Receipt from disposal of the investment	R$ 395661
Deposit in Warranty	2,000
Contractual expenses and fees (d)	2,339
Basis price for alienation (a)	400,000
Working Capital Receivable (b) (*)	34,008
Shareholder's Equity da LLC (c)	133,445
Net gain of alienation = (a+b-c-d)	298,224
USD | Change in working capital
SaleOfForeignSubsidiaryLineItems [Line Items]
Working Capital Receivable (b) (*)	3,581
Net gain of alienation = (a+b-c-d)	3,581
R
SaleOfForeignSubsidiaryLineItems [Line Items]
Receipt from disposal of the investment	1,525,590
Deposit in Warranty	7,712
Contractual expenses and fees (d)	9,021
Basis price for alienation (a)	1,542,323
Working Capital Receivable (b) (*)	131,127
Shareholder's Equity da LLC (c)	514,537
Net gain of alienation = (a+b-c-d)	1,149,892
R | Change in working capital
SaleOfForeignSubsidiaryLineItems [Line Items]
Receipt from disposal of the investment		R$ 1525590
Deposit in Warranty		7,712
Contractual expenses and fees (d)		9,021
Basis price for alienation (a)		1,542,323
Working Capital Receivable (b) (*)	14,402	145,529
Shareholder's Equity da LLC (c)		514,537
Net gain of alienation = (a+b-c-d)	R$ 14402	R$ 1164294

3. SALE OF FOREIGN SUBSIDIARY_3

3. SALE OF FOREIGN SUBSIDIARY (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Current Assets	R$ 12014483		R$ 11881496
Cash and cash equivalents	2,248,004		3,411,572		R$ 4871162	R$ 7861052
Trade Receivable	2,078,182		2,197,078
Inventory	5,039,560		4,464,419
Non-current assets	35,313,041		33,328,474
Property, plant and equipment	18,046,864		17,964,839		18,135,879
TOTAL ASSETS	47,327,524		45,209,970
LIABILITIES
Current Liabilities	11,438,552		10,670,050
Tax payables	251,746		264,097
Non-current liabilities	25,875,532		26,251,691
Borrowings and Financing	5,019,978
Shareholders' equity (disposal)	R$ 10013440		8,288,229		7,384,521	R$ 7091288
LLC
ASSETS
Current Assets		R$ 418014
Cash and cash equivalents		760,000	R$ 33930	R$ 38860	R$ 112428
Trade Receivable		114,266
Inventory		299,373
Other current assets		3,615
Non-current assets		191,431
Other non-current assets		205
Property, plant and equipment		191,226
TOTAL ASSETS		609,445
LIABILITIES
Current Liabilities		89,810
Borrowings and Financing		5,446
Social and Labor obligations		5,526
Trade payables		76,400
Tax payables		1,398
Other payables		1,040
Non-current liabilities		5,098
Borrowings and Financing		5,098
Shareholders' equity (disposal)		514,537
TOTAL LIABILITIES		R$ 609445

3. SALE OF FOREIGN SUBSIDIARY_4

3. SALE OF FOREIGN SUBSIDIARY (Details 2) - BRL (R$) R$ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SaleOfForeignSubsidiaryLineItems [Line Items]
Net Revenues			R$ 22968885	R$ 18524601	R$ 17148949
Cost of sales and services			(16,105,657)	(13,596,141)	(12,640,042)
Gross profit			6,863,228	4,928,460	4,508,907
Selling expenses			(2,263,688)	(1,815,107)	(1,696,896)
General and administrative expenses			(494,023)	(415,841)	(518,232)
Other operating expenses, net			(1,330,706)	(646,944)	(1,076,730)
Profit before financial income (expenses) and taxes			6,946,560	2,983,965	1,945,476
Financial income (expenses), net			(1,495,643)	(2,463,627)	(2,522,427)
Profit (loss) before taxes			5,450,917	520,338	(576,951)
Income tax and social contribution			(250,334)	(409,109)	(266,546)
Profit (loss) for the year			R$ 5200583	R$ 111229	R$ 853058
LLC
SaleOfForeignSubsidiaryLineItems [Line Items]
Net Revenues	R$ 997061	R$ 472409
Cost of sales and services	(888,850)	(388,322)
Gross profit	108,211	84,087
Selling expenses	(24,650)	(10,521)
General and administrative expenses	(15,649)	(9,531)
Other operating expenses, net	(844)	(358)
Profit before financial income (expenses) and taxes	67,068	63,677
Financial income (expenses), net	(2,641)	(428)
Profit (loss) before taxes	64,427	63,249
Income tax and social contribution	(1,730)	0
Profit (loss) for the year	R$ 62697	R$ 63249

3. SALE OF FOREIGN SUBSIDIARY_5

3. SALE OF FOREIGN SUBSIDIARY (Details 3) - BRL (R$) R$ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SaleOfForeignSubsidiaryLineItems [Line Items]
Net cash provided by (used) by operating activities			R$ 2208105	R$ 571851	R$ 275918
Net cash provided by (used) by investing activities			(98,459)	(1,049,224)	(2,305,168)
Net cash provided by (used) by financing activities			(3,257,186)	(993,755)	(883,012)
Increase (decrease) in cash and cash equivalents for the period			(1,163,568)	(1,459,590)	(2,989,890)
Cash and cash equivalents at the beginning of the year	R$ 3411572	R$ 4871162	3,411,572	4,871,162	7,861,052
Cash and cash equivalents at the end of the year			2,248,004	3,411,572	4,871,162
LLC
SaleOfForeignSubsidiaryLineItems [Line Items]
Net cash provided by (used) by operating activities	149,691	(69,216)
Net cash provided by (used) by investing activities	(6,269)	(2,492)
Net cash provided by (used) by financing activities	(176,592)	(1,860)
Increase (decrease) in cash and cash equivalents for the period	(33,170)	(73,568)
Cash and cash equivalents at the beginning of the year	33,930	112,428	R$ 33930	112,428
Cash and cash equivalents at the end of the year	760,000	R$ 38860		R$ 33930	R$ 112428
Net cash received from the sale of the asset	1,525,590
Cash and cash equivalents transferred on the sale of the assets	(760)
Working capital received	145,529
Net cash provided by the sale of assets	R$ 1670359

4. CASH AND CASH EQUIVALENTS (D

4. CASH AND CASH EQUIVALENTS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]
Cash and banks	R$ 1124714	R$ 193702
Short-term investments	1,123,290	3,217,870
Cash and cash equivalents	2,248,004	3,411,572	R$ 4871162	R$ 7861052
Brazil
Disclosure of fair value measurement of assets [line items]
Short-term investments	619,727	656,625
Brazil | Government securities
Disclosure of fair value measurement of assets [line items]
Short-term investments	10,247	12,100
Brazil | Private securities
Disclosure of fair value measurement of assets [line items]
Short-term investments	609,480	644,525
Abroad | Time deposits
Disclosure of fair value measurement of assets [line items]
Short-term investments	R$ 503563	R$ 2561245

5. FINANCIAL INVESTMENTS (Detai

5. FINANCIAL INVESTMENTS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Financial Investments	R$ 895713	R$ 735712
CDB - Bank deposit certificate
Disclosure of fair value measurement of assets [line items]
Financial Investments	882,376	716,218
Government securities
Disclosure of fair value measurement of assets [line items]
Financial Investments	R$ 13337	R$ 19494

6. TRADE RECEIVABLES (Details)

6. TRADE RECEIVABLES (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Trade receivables	R$ 2078182	R$ 2197078
Third parties
Disclosure of fair value measurement of assets [line items]
Trade receivables	2,222,217	2,273,669
Third parties | Domestic market
Disclosure of fair value measurement of assets [line items]
Trade receivables	1,369,396	1,290,823
Third parties | Foreign market
Disclosure of fair value measurement of assets [line items]
Trade receivables	852,821	982,846
Allowance for doubtful accounts
Disclosure of fair value measurement of assets [line items]
Trade receivables	(237,352)	(191,979)
Subtotal
Disclosure of fair value measurement of assets [line items]
Trade receivables	1,984,865	2,081,690
Related parties
Disclosure of fair value measurement of assets [line items]
Trade receivables	R$ 93317	R$ 115388

6. TRADE RECEIVABLES (Details 1

6. TRADE RECEIVABLES (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Trade receivables	R$ 2078182	R$ 2197078
Third parties
Disclosure of fair value measurement of assets [line items]
Trade receivables	2,222,217	2,273,669
Third parties | Current
Disclosure of fair value measurement of assets [line items]
Trade receivables	1,514,847	1,391,839
Third parties | Past-due up to 30 days
Disclosure of fair value measurement of assets [line items]
Trade receivables	177,287	167,760
Third parties | Past-due up to 180 days
Disclosure of fair value measurement of assets [line items]
Trade receivables	47,684	142,346
Third parties | Past-due over 180 days
Disclosure of fair value measurement of assets [line items]
Trade receivables	R$ 482399	R$ 571724

6. TRADE RECEIVABLES (Details 2

6. TRADE RECEIVABLES (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Trade Receivables
Opening balance	R$ 191979	R$ 172782
Expected credit losses	(53,706)	(36,697)
Recovery of receivables	8,333	17,500
Closing balance	R$ 237352	R$ 191979

6. TRADE RECEIVABLES (Details N

6. TRADE RECEIVABLES (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Trade Receivables Details Narrative Abstract
Trade receivables transaction costs	R$ 46210	R$ 186627

7. INVENTORIES (Details)

7. INVENTORIES (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventories Details Abstract
Finished goods	R$ 1362981	R$ 1308802
Work in progress	1,122,933	1,135,589
Raw materials	1,560,499	1,050,588
Spare parts	856,097	814,725
Iron ore	258,612	278,041
Advances to suppliers	36,192	12,514
(-) Provision for losses	(157,754)	(135,840)	R$ 101176
Inventories	R$ 5039560	R$ 4464419

7. INVENTORIES (Details 1)

7. INVENTORIES (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Inventories Details 1Abstract
Provision for inventory losses, beginning	R$ 135840	R$ 101176
(Estimated losses) / Reversal of inventories with low turnover and obsolescence	(21,914)	(34,664)
Provision for inventory losses, ending	R$ 157754	R$ 135840

8. OTHER CURRENT AND NON-CURR_3

8. OTHER CURRENT AND NON-CURRENT ASSETS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Other current assets	R$ 1753024	R$ 1072715
Other non-current assets	4,285,223	2,528,475
Judicial deposits
Disclosure of fair value measurement of assets [line items]
Other non-current assets	347,950	339,351
Credits with the PGFN
Disclosure of fair value measurement of assets [line items]
Other non-current assets	46,774	46,774
Recoverable taxes
Disclosure of fair value measurement of assets [line items]
Other current assets	1,412,335	866,986
Other non-current assets	1,822,388	401,071
Prepaid expenses
Disclosure of fair value measurement of assets [line items]
Other current assets	49,830	50,078
Other non-current assets	49,808	30,741
Actuarial asset - related party
Disclosure of fair value measurement of assets [line items]
Other non-current assets	99,894	111,281
Derivative financial instruments
Disclosure of fair value measurement of assets [line items]
Other current assets	351
Securities held for trading
Disclosure of fair value measurement of assets [line items]
Other current assets	4,503	2,952
Iron ore inventory
Disclosure of fair value measurement of assets [line items]
Other non-current assets	144,499	144,499
Northeast Investment Fund - FINOR
Disclosure of fair value measurement of assets [line items]
Other non-current assets	26,598	26,598
Other receivables
Disclosure of fair value measurement of assets [line items]
Other non-current assets	7,451	20,024
Loans with related parties
Disclosure of fair value measurement of assets [line items]
Other current assets	2,675	2,441
Other non-current assets	706,605	554,694
Other receivables from related parties
Disclosure of fair value measurement of assets [line items]
Other current assets	3,649	3,577
Other non-current assets	218,840	30,770
Monetary adjustment related to the Eletrobras's compulsory loan
Disclosure of fair value measurement of assets [line items]
Other non-current assets	813,428	784,741
Dividends receivable
Disclosure of fair value measurement of assets [line items]
Other current assets	46,171	41,528
Debit of employees
Disclosure of fair value measurement of assets [line items]
Other current assets	31,645	33,942
Other credits
Disclosure of fair value measurement of assets [line items]
Other current assets	117,156	3,667
Other
Disclosure of fair value measurement of assets [line items]
Other current assets	12,753	67,544
Other non-current assets	R$ 988	R$ 37931

9. INVESTMENTS (Details)

9. INVESTMENTS (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]
Assets	R$ 47327524	R$ 45209970
Shareholders' equity	10,013,440	8,288,229	R$ 7384521	R$ 7091288
Fair Value Allocation	271,116	271,116
Profit (loss) for the year	(5,200,583)	(111,229)	R$ 853058
Classified as available for sale
Usiminas	2,250,623	2,200,459
Panatlantica	28,566	21,974
Classified as available for sale	2,279,189	2,222,433
Others investments
Others investments	112	76
Total Investments	R$ 5359497	R$ 5228879
Joint Venture/Joint Operation 1
Disclosure of fair value measurement of assets [line items]
Joint venture and joint operation name	MRS Logística S.A.
Number of common shares held by CSN	126,716,070
Direct equity interest, joint venture and joint operation	37.27%	37.27%
Assets	R$ 3125912	R$ 3039761
Liabilities	1,693,200	1,714,729
Shareholders' equity	1,878,095	1,782,162
Profit (loss) for the year	R$ 194403	R$ 171905
Joint Venture/Joint Operation 2
Disclosure of fair value measurement of assets [line items]
Joint venture and joint operation name	CBSI - Companhia Brasileira de Serviços de Infraestrutura
Number of common shares held by CSN	1,876,146
Direct equity interest, joint venture and joint operation	50.00%	50.00%
Assets	R$ 25941	R$ 16005
Liabilities	19,997	13,654
Shareholders' equity	5,944	2,351
Profit (loss) for the year	R$ 4501	R$ 1785
Joint Venture/Joint Operation 3
Disclosure of fair value measurement of assets [line items]
Joint venture and joint operation name	Transnordestina Logística S.A.
Number of common shares held by CSN	24,168,304
Direct equity interest, joint venture and joint operation	46.30%	46.28%
Assets	R$ 4065604	R$ 3806380
Liabilities	2,883,851	2,604,198
Shareholders' equity	1,181,753	1,202,182
Fair Value Allocation	271,116	271,116
Profit (loss) for the year	(20,429)	(21,357)
Joint Venture/Joint Operation
Disclosure of fair value measurement of assets [line items]
Assets	7,217,457	6,862,146
Liabilities	4,597,048	4,332,581
Shareholders' equity	3,065,792	2,986,695
Fair Value Allocation	271,116	271,116
Profit (loss) for the year	R$ 178475	R$ 152333
Associate 1
Disclosure of fair value measurement of assets [line items]
Associate name	Arvedi Metalfer do Brasil
Number of common shares held by CSN	46,994,971
Direct equity interest, associate	20.00%	20.00%
Assets	R$ 40712	R$ 43653
Liabilities	26,308	23,978
Shareholders' equity	14,404	19,675
Profit (loss) for the year	(5,087)	(4,368)
Associate
Disclosure of fair value measurement of assets [line items]
Assets	40,712	43,653
Liabilities	26,308	23,978
Shareholders' equity	14,404	19,675
Profit (loss) for the year	R$ 5087	R$ 4368

9. INVESTMENTS (Details 1)

9. INVESTMENTS (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Investments Details 1Abstract
Investments in associates and joint controlled entities, beginning	R$ 5499995	R$ 4568451
Capital increase		20,579
Dividends	(87,846)	(79,189)
Comprehensive income (1)	272	850,640
Equity in results of affiliated companies (2)	173,145	147,800
Received from sale of Usimina's shares	(39,377)
Update of shares measured at Fair Value through profit or loss (VJR) (note 13 II)	96,133
Amortization of fair value - investment in MRS	(11,746)	(11,746)
Others	37	3,460
Investments in associates and joint controlled entities, ending	R$ 5630613	R$ 5499995

9. INVESTMENTS (Details 2)

9. INVESTMENTS (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]
Equity in results of affiliated companies	R$ 173145	R$ 147800
Eliminations
To cost of sales	(42,806)	(40,823)
To taxes	14,554	13,880
Others
Amortization of fair value - investment in MRS	(11,746)	(11,746)
Others	2,559
Equity in results adjusted	135,706	109,111	R$ 64918
MRS Logistica S.A.
Disclosure of fair value measurement of assets [line items]
Equity in results of affiliated companies	194,403	171,905
CBSI - Companhia Brasileira de Servicos de Infraestrutura
Disclosure of fair value measurement of assets [line items]
Equity in results of affiliated companies	4,501	1,785
Transnordestina
Disclosure of fair value measurement of assets [line items]
Equity in results of affiliated companies	(20,429)	(21,357)
Arvedi Metalfer do Brasil
Disclosure of fair value measurement of assets [line items]
Equity in results of affiliated companies	(5,087)	(4,368)
Others
Disclosure of fair value measurement of assets [line items]
Equity in results of affiliated companies	R$ 243	R$ 165

9. INVESTMENTS (Details 3)

9. INVESTMENTS (Details 3) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	R$ 2248004	R$ 3411572	R$ 4871162	R$ 7861052
Advances to suppliers	36,192	12,514
Total current assets	12,014,483	11,881,496
Non-current assets
Investments, PP&E and intangible assets	18,046,864	17,964,839	18,135,879
Tota non-current assets	35,313,041	33,328,474
Total assets	47,327,524	45,209,970
Current liabilities
Borrowings and financing	5,653,439	6,526,902
Total current liabilities	11,438,552	10,670,050
Non-current liabilities
Borrowings and financing	23,173,635	22,983,942
Total non-current liabilities	25,875,532	26,251,691
Shareholders' equity	10,013,440	8,288,229	R$ 7384521	R$ 7091288
Total liabilities and shareholders' equity	47,327,524	45,209,970
Ita Energetica | Joint Operation
Current assets
Cash and cash equivalents	29,870	16,231
Advances to suppliers	937	22
Other current assets	16,718	16,447
Total current assets	47,525	32,700
Non-current assets
Other non-current assets	25,840	27,459
Investments, PP&E and intangible assets	457,578	484,406
Tota non-current assets	483,418	511,865
Total assets	530,943	544,565
Current liabilities
Borrowings and financing		0
Other current liabilities	18,298	33,666
Total current liabilities	18,298	33,666
Non-current liabilities
Borrowings and financing		0
Other non-current liabilities	15,113	3,471
Total non-current liabilities	15,113	3,471
Shareholders' equity	497,532	507,428
Total liabilities and shareholders' equity	530,943	544,565
Joint Venture | MRS Logistica
Current assets
Cash and cash equivalents	345,962	484,978
Advances to suppliers	17,750	14,911
Other current assets	736,768	685,311
Total current assets	1,100,480	1,185,200
Non-current assets
Other non-current assets	804,570	693,434
Investments, PP&E and intangible assets	6,482,292	6,277,550
Tota non-current assets	7,286,862	6,970,984
Total assets	8,387,342	8,156,184
Current liabilities
Borrowings and financing	422,793	668,947
Other current liabilities	1,368,290	1,272,365
Total current liabilities	1,791,083	1,941,312
Non-current liabilities
Borrowings and financing	2,111,518	2,084,422
Other non-current liabilities	640,535	575,170
Total non-current liabilities	2,752,053	2,659,592
Shareholders' equity	3,844,206	3,555,280
Total liabilities and shareholders' equity	8,387,342	8,156,184
Joint Venture | CBSI
Current assets
Cash and cash equivalents	2,091	101
Advances to suppliers	73	37
Other current assets	41,284	28,475
Total current assets	43,448	28,613
Non-current assets
Other non-current assets	2,111	974
Investments, PP&E and intangible assets	6,324	2,423
Tota non-current assets	8,435	3,397
Total assets	51,883	32,010
Current liabilities
Borrowings and financing	4,350	1,411
Other current liabilities	33,844	25,898
Total current liabilities	38,194	27,309
Non-current liabilities
Borrowings and financing	1,262	0
Other non-current liabilities	539	0
Total non-current liabilities	1,801	0
Shareholders' equity	11,888	4,701
Total liabilities and shareholders' equity	51,883	32,010
Joint Venture | Transnordestina Logistica
Current assets
Cash and cash equivalents	19,234	5,763
Advances to suppliers	1,734	0
Other current assets	108,851	49,494
Total current assets	129,819	55,257
Non-current assets
Other non-current assets	222,630	238,004
Investments, PP&E and intangible assets	8,428,567	7,927,881
Tota non-current assets	8,651,197	8,165,885
Total assets	8,781,016	8,221,142
Current liabilities
Borrowings and financing	75,906	52,691
Other current liabilities	179,816	113,739
Total current liabilities	255,722	166,430
Non-current liabilities
Borrowings and financing	5,754,073	5,457,768
Other non-current liabilities	218,839	434
Total non-current liabilities	5,972,912	5,458,202
Shareholders' equity	2,552,382	2,596,510
Total liabilities and shareholders' equity	R$ 8781016	R$ 8221142

9. INVESTMENTS (Details 4)

9. INVESTMENTS (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]
Net revenues	R$ 22968885	R$ 18524601	R$ 17148949
Cost of sales and services	16,105,657	13,596,141	12,640,042
Gross profit	6,863,228	4,928,460	4,508,907
Operating (expense) income	83,332	(1,944,495)	(2,563,431)
Finance income (costs), net	(1,495,643)	(2,463,627)	(2,522,427)
Income before income tax and social contribution	5,450,917	520,338	(576,951)
Current and deferred income tax and social contribution	250,334	409,109	266,546
Profit (loss) for the year	(5,200,583)	(111,229)	R$ 853058
Ita Energetica | Joint Operation
Disclosure of fair value measurement of assets [line items]
Net revenues	166,358	168,194
Cost of sales and services	(77,829)	(76,810)
Gross profit	88,529	91,384
Operating (expense) income	(60,104)	(58,465)
Finance income (costs), net	(126)	317
Income before income tax and social contribution	28,299	33,236
Current and deferred income tax and social contribution	(9,452)	(11,105)
Profit (loss) for the year	18,847	22,131
Joint Venture | MRS Logistica
Disclosure of fair value measurement of assets [line items]
Net revenues	3,726,448	3,492,805
Cost of sales and services	(2,476,628)	(2,307,108)
Gross profit	1,249,820	1,185,697
Operating (expense) income	(313,606)	(283,151)
Finance income (costs), net	(151,839)	(187,295)
Income before income tax and social contribution	784,375	715,251
Current and deferred income tax and social contribution	(262,760)	(254,001)
Profit (loss) for the year	521,615	461,250
Joint Venture | CBSI
Disclosure of fair value measurement of assets [line items]
Net revenues	166,080	135,399
Cost of sales and services	(142,254)	(120,647)
Gross profit	23,826	14,752
Operating (expense) income	(10,884)	(8,340)
Finance income (costs), net	(179)	(1,004)
Income before income tax and social contribution	12,763	5,408
Current and deferred income tax and social contribution	(3,761)	(1,838)
Profit (loss) for the year	9,002	3,570
Joint Venture | Transnordestina Logistica
Disclosure of fair value measurement of assets [line items]
Net revenues		0
Cost of sales and services		0
Gross profit		0
Operating (expense) income	(18,020)	(32,245)
Finance income (costs), net	(26,103)	(13,938)
Income before income tax and social contribution	(44,123)	(46,183)
Current and deferred income tax and social contribution		0
Profit (loss) for the year	R$ 44123	R$ 46183

9. INVESTMENTS (Details 5)

9. INVESTMENTS (Details 5)	12 Months Ended
	Dec. 31, 2018
Gross Margin
Disclosure of fair value measurement of assets [line items]
Main assumptions (Until 2057)	Based on market studies to capture operations costs and loads, according studied of market trends.
Estimated Costs
Disclosure of fair value measurement of assets [line items]
Main assumptions (Until 2057)	Costs based on studies and market trends.
Growth rate in perpetuity
Disclosure of fair value measurement of assets [line items]
Main assumptions (Until 2057)	Growth rate was not considered due to the projection model until the end of the concession.
Discount rate
Disclosure of fair value measurement of assets [line items]
Main assumptions (Until 2057)	Between 5.1% to 7.9% in real terms.

9. INVESTMENTS (Details Narrati

9. INVESTMENTS (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Expenses		R$ 1380193
Consorcio da Usina Hidrelectrica de Igarapava
Disclosure of fair value measurement of assets [line items]
Property, plant and equipment	R$ 23596	24,759
Expenses	R$ 5827	R$ 5966

10. PROPERTY, PLANT AND EQUIP_3

10. PROPERTY, PLANT AND EQUIPMENT (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	R$ 29083214	R$ 27726117
Accumulated depreciation, beginning	(11,118,375)	(9,590,238)
Property, plant and equipment, beginning	17,964,839	18,135,879
Translation Adjustment	115,359	107,184
Acquisitions	1,327,894	1,063,746
Capitalized interest	71,611	91,957
Write-off and estimative losses, net of reversed	(38,245)	(28,057)
Depreciation		(1,380,193)
Write-off - sale of subsidiary LLC	(191,226)
Transfers to intangible assets	3,807	(26,183)
Others	(1,603)	506
Property, plant and equipment, ending	18,046,864	17,964,839
Cost, ending	30,269,600	29,083,214
Accumulated depreciation, ending	(12,222,736)	(11,118,375)
Land
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	279,740	264,629
Property, plant and equipment, beginning	279,740	264,629
Translation Adjustment	7,730	8,702
Acquisitions	622	8,241
Write-off and estimative losses, net of reversed		653
Depreciation	(134,534)
Transfers to other asset categories	30,031	(2,485)
Write-off - sale of subsidiary LLC	(238)
Property, plant and equipment, ending	287,854	279,740
Cost, ending	287,854	279,740
Buildings and Infrastructure
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	3,819,929	3,637,903
Accumulated depreciation, beginning	(1,022,982)	(822,224)
Property, plant and equipment, beginning	2,796,947	2,815,679
Translation Adjustment	11,653	21,737
Acquisitions	1,259	1,196
Write-off and estimative losses, net of reversed	(9,768)	30,634
Depreciation	(1,043,188)	(156,580)
Transfers to other asset categories	685,005	84,281
Write-off - sale of subsidiary LLC	(16,950)
Property, plant and equipment, ending	2,678,638	2,796,947
Cost, ending	3,751,429	3,819,929
Accumulated depreciation, ending	(1,072,791)	(1,022,982)
Machinery, equipment and facilities
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	21,674,362	20,712,371
Accumulated depreciation, beginning	(9,688,442)	(8,342,741)
Property, plant and equipment, beginning	11,985,920	12,369,630
Translation Adjustment	86,553	72,811
Acquisitions	144,499	91,251
Write-off and estimative losses, net of reversed	(21,468)	(30,383)
Depreciation	(5,394)	(1,174,852)
Transfers to other asset categories	891	659,119
Write-off - sale of subsidiary LLC	(145,958)
Transfers to intangible assets	5,559
Others	(9,651)	(1,656)
Property, plant and equipment, ending	11,687,271	11,985,920
Cost, ending	22,426,782	21,674,362
Accumulated depreciation, ending	(10,739,511)	(9,688,442)
Furniture and fixtures
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	164,152	173,821
Accumulated depreciation, beginning	(131,049)	(140,658)
Property, plant and equipment, beginning	33,103	33,163
Translation Adjustment	543	593
Acquisitions	1,574	1,171
Write-off and estimative losses, net of reversed	(6)	(37)
Depreciation		(5,656)
Transfers to other asset categories	(424,443)	3,869
Write-off - sale of subsidiary LLC	(181)
Property, plant and equipment, ending	30,530	33,103
Cost, ending	165,331	164,152
Accumulated depreciation, ending	(134,801)	(131,049)
Construction in progress
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	2,475,935	2,260,864
Accumulated depreciation, beginning
Property, plant and equipment, beginning	2,475,935	2,260,864
Translation Adjustment	4,275	3,076
Acquisitions	1,158,788	951,796
Capitalized interest	71,611	91,957
Write-off and estimative losses, net of reversed	(4,348)	(2,536)
Depreciation	(22,456)
Transfers to other asset categories	(291,484)	(805,207)
Write-off - sale of subsidiary LLC	(6,070)
Transfers to intangible assets	(1,752)	(26,183)
Others	8,440	2,168
Property, plant and equipment, ending	3,282,436	2,475,935
Cost, ending	3,282,436	2,475,935
Other
Disclosure of detailed information about property, plant and equipment [line items]
Cost, beginning	669,096	676,529
Accumulated depreciation, beginning	(275,902)	(284,615)
Property, plant and equipment, beginning	393,194	391,914
Translation Adjustment	4,605	265
Acquisitions	21,152	10,091
Write-off and estimative losses, net of reversed	(2,655)	(26,388)
Depreciation	(1,205,572)	(43,105)
Transfers to other asset categories		60,423
Write-off - sale of subsidiary LLC	(21,829)
Others	(392)	(6)
Property, plant and equipment, ending	80,135	393,194
Cost, ending	355,768	669,096
Accumulated depreciation, ending	R$ 275633	R$ 275902

10. PROPERTY, PLANT AND EQUIP_4

10. PROPERTY, PLANT AND EQUIPMENT (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	R$ 3282436	R$ 2475935
Logistics
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	89,595	106,956
Logistics | Current investments to maintain current operations at their full capacity
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	89,595	106,956
Mining
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	1,859,108	1,435,332
Mining | Current investments to maintain current operations at their full capacity
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	R$ 725616	408,522
Mining | Expansion of Casa de Pedra Mine capacity production
Disclosure of detailed information about property, plant and equipment [line items]
Start date	2007
Completion date	2020
Construction in progress	R$ 844194	750,999
Mining | Expansion of TECAR export capacity
Disclosure of detailed information about property, plant and equipment [line items]
Start date	2009
Completion date	2022
Construction in progress	R$ 289298	275,811
Steel
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	653,842	327,512
Steel | Current investments to maintain current operations at their full capacity
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	R$ 558922	228,029
Steel | Supply of 16 torpedo's cars for operation in the steel industry
Disclosure of detailed information about property, plant and equipment [line items]
Start date	2008
Completion date	2020
Construction in progress	R$ 94920	99,483
Cement
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	679,891	606,135
Cement | Current investments to maintain current operations at their full capacity
Disclosure of detailed information about property, plant and equipment [line items]
Construction in progress	R$ 94728	51,270
Cement | Construction of cement plants
Disclosure of detailed information about property, plant and equipment [line items]
Start date	2011
Completion date	2023
Construction in progress	R$ 585163	R$ 554865

10. PROPERTY, PLANT AND EQUIP_5

10. PROPERTY, PLANT AND EQUIPMENT (Details 2)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Buildings
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful life	38 years	39 years
Machinery, equipment and facilities
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful life	22 years	21 years
Furniture and fixtures
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful life	11 years	12 years
Other
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful life	15 years	17 years

10. PROPERTY, PLANT AND EQUIP_6

10. PROPERTY, PLANT AND EQUIPMENT (Details 3)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Unspecified projects
Disclosure of detailed information about property, plant and equipment [line items]
Capitalized borrowing costs rate (in percent)	6.31%	8.63%

10. PROPERTY, PLANT AND EQUIP_7

10. PROPERTY, PLANT AND EQUIPMENT (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Unspecified projects
Disclosure of detailed information about property, plant and equipment [line items]
Capitalized borrowing costs	R$ 71611	R$ 91957

11. INTANGIBLE ASSETS (Details)

11. INTANGIBLE ASSETS (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	R$ 7834751	R$ 7764371
Accumulated amortization, beginning	(453,375)	(396,637)
Adjustment for accumulated recoverable value, beginning	(109,330)	(109,330)
Intangible assets, beginning	7,272,046	7,258,404
Translation Adjustment	50,185	60,105
Acquisitions and expenditures	2,200	622
Transfer of property, plant and equipment	(3,807)	26,183
Write-offs/disposals		(70)
Amortization	(67,449)	(73,142)
Aquisition control - CGPAR		(56)
Transfer of Metalic - Held for sale
Intangible assets, ending	7,253,175	7,272,046
Cost, ending	7,903,220	7,834,751
Accumulated amortization, ending	(540,715)	(453,375)
Adjustment for accumulated recoverable value, ending	(109,330)	(109,330)
Goodwill
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	3,834,234	3,834,234
Accumulated amortization, beginning	(133,973)	(133,973)
Adjustment for accumulated recoverable value, beginning	(109,330)	(109,330)
Intangible assets, beginning	3,590,931	3,590,931
Translation Adjustment
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals
Amortization
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending	3,590,931	3,590,931
Cost, ending	3,831,338	3,834,234
Accumulated amortization, ending	(131,077)	(133,973)
Adjustment for accumulated recoverable value, ending	(109,330)	(109,330)
Customer relationships
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	513,068	444,635
Accumulated amortization, beginning	(212,193)	(146,975)
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning	300,875	297,660
Translation Adjustment	34,107	41,916
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals
Amortization	(46,209)	(38,701)
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending	288,773	300,875
Cost, ending	573,614	513,068
Accumulated amortization, ending	(284,841)	(212,193)
Adjustment for accumulated recoverable value, ending
Software
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	167,162	183,166
Accumulated amortization, beginning	(93,977)	(114,913)
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning	73,185	68,253
Translation Adjustment	148	183
Acquisitions and expenditures	1,216	622
Transfer of property, plant and equipment	(3,807)	26,183
Write-offs/disposals		(70)
Amortization	(15,770)	(21,986)
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending	54,972	73,185
Cost, ending	161,067	167,162
Accumulated amortization, ending	(106,095)	(93,977)
Adjustment for accumulated recoverable value, ending
Trademark and patents
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	134,137	116,196
Accumulated amortization, beginning
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning	134,137	116,196
Translation Adjustment	15,872	17,941
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals
Amortization
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending	150,009	134,137
Cost, ending	150,009	134,137
Accumulated amortization, ending
Adjustment for accumulated recoverable value, ending
Rights and licenses
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	3,185,701	3,185,700
Accumulated amortization, beginning	(13,232)	(776)
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning	3,172,469	3,184,924
Translation Adjustment
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals
Amortization	(5,470)	(12,455)
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending	3,166,999	3,172,469
Cost, ending	3,185,701	3,185,701
Accumulated amortization, ending	(18,702)	(13,232)
Adjustment for accumulated recoverable value, ending
Others
Disclosure of detailed information about intangible assets [line items]
Cost, beginning	449	440
Accumulated amortization, beginning
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning	449	440
Translation Adjustment	58	65
Acquisitions and expenditures	984
Transfer of property, plant and equipment
Write-offs/disposals
Amortization
Aquisition control - CGPAR		(56)
Transfer of Metalic - Held for sale
Intangible assets, ending	1,491	449
Cost, ending	1,491	449
Accumulated amortization, ending
Adjustment for accumulated recoverable value, ending

11. INTANGIBLE ASSETS (Details

11. INTANGIBLE ASSETS (Details 1)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Software
Disclosure of detailed information about intangible assets [line items]
Estimated useful life	7 years	8 years
Customer relationships
Disclosure of detailed information about intangible assets [line items]
Estimated useful life	13 years	13 years

11. INTANGIBLE ASSETS (Detail_2

11. INTANGIBLE ASSETS (Details 2) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]
Goodwill	R$ 3590931	R$ 3590931
Trademarks	150,009	134,137
Total	3,740,940	3,725,068
Packaging
Disclosure of detailed information about intangible assets [line items]
Goodwill	158,748	158,748
Trademarks
Total	158,748	158,748
Long steel
Disclosure of detailed information about intangible assets [line items]
Goodwill	235,595	235,595
Trademarks	150,009	134,137
Total	385,604	369,732
Mining
Disclosure of detailed information about intangible assets [line items]
Goodwill	3,196,588	3,196,588
Trademarks
Total	R$ 3196588	R$ 3196588

11. INTANGIBLE ASSETS (Detail_3

11. INTANGIBLE ASSETS (Details 3)	12 Months Ended
	Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]
Discount rate	For Metal packaging, flat steel and mining, these cash flows were considered using a discount rate after taxes between 5% and 13% p.a. in
Metal packaging
Disclosure of detailed information about intangible assets [line items]
Measurement of recoverable value	Discounted Cash Flow
Cash flow projection	Until 2028 + perpetuity
Gross Margin	Gross margin updated based on historical data, impacts of business restructuring and market trends
Cost Actualization	Cost based on historical data of each product and impacts of business restructuring
Growth rate	Growth of 1.5% p.a in real terms updated by long term inflation of 4.0% p.a.
Flat steel
Disclosure of detailed information about intangible assets [line items]
Measurement of recoverable value	Discounted Cash Flow
Cash flow projection	Until 2028 + perpetuity
Gross Margin	Gross margin updated based on historical data and market trends.
Cost Actualization	Updated costs based on historical data and market trends
Growth rate	Growth of 1.4% p.a in real terms updated by long term inflation of 2.5% p.a. of the Euro zone
Logistic
Disclosure of detailed information about intangible assets [line items]
Measurement of recoverable value	Discounted Cash Flow
Cash flow projection	Until 2027
Gross Margin	Estimated based on market studies for cargo captures and operational costs according market trends.
Cost Actualization	Costs based on historical data and market trends
Growth rate	Growth of 1.5% p.a in real terms
Mining
Disclosure of detailed information about intangible assets [line items]
Measurement of recoverable value	Discounted Cash Flow
Cash flow projection	Until 2054
Gross Margin	Reflects projection of costs due to the progress of the mining plan as well as startup and ramp up of projects . Price and exchange rate projected according industry reports.
Cost Actualization	Updated costs based on historical data, progress of mining plan as well as startup and ramp up of projects
Growth rate	Without growth in real terms updated only by long term inflation of 4.0% p.a.

12. BORROWINGS, FINANCING AND_3

12. BORROWINGS, FINANCING AND DEBENTURES (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	R$ 5681797	R$ 6551764
Borrowings and financing, noncurrent	23,260,944	23,017,953
Transaction costs and issue premiums, current	(28,358)	(24,862)
Transaction costs and issue premiums, noncurrent	(87,309)	(34,011)
Borrowings and financing and transaction costs, current	5,653,439	6,526,902
Borrowings and financing and transaction costs, noncurrent	23,173,635	22,983,942
Foreign Currency
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	3,687,971	1,566,302
Borrowings and financing, noncurrent	12,550,266	13,214,982
Foreign Currency | Prepayment
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	1,016,737	791,163
Borrowings and financing, noncurrent	3,830,240	4,097,509
Foreign Currency | Perpetual bonds
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	2,490,178
Borrowings and financing, noncurrent	8,613,491
Foreign Currency | Others
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	181,056	251,630
Borrowings and financing, noncurrent	106,535	197,131
Foreign Currency | Advance contract exchange (ACC)
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current		523,509
Borrowings and financing, noncurrent		8,920,342
Local Currency
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	1,993,826	4,985,462
Borrowings and financing, noncurrent	10,710,678	9,802,972
Local Currency | Prepayment
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	103,376	3,303
Borrowings and financing, noncurrent		100,000
Local Currency | BNDES/FINAME
Disclosure of detailed information about borrowings [line items]
Borrowings and financing, current	1,890,450	4,982,159
Borrowings and financing, noncurrent	R$ 10710678	R$ 9702972

12. BORROWINGS, FINANCING AND_4

12. BORROWINGS, FINANCING AND DEBENTURES (Details 1) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Disclosure of detailed information about borrowings [line items]
Total debt	R$ 28942741
USD
Disclosure of detailed information about borrowings [line items]
Average interest rate	5.88%
Total debt	R$ 12704504
R
Disclosure of detailed information about borrowings [line items]
Average interest rate	8.19%
Total debt	R$ 15950646
EUR
Disclosure of detailed information about borrowings [line items]
Average interest rate	3.88%
Total debt	R$ 287591

12. BORROWINGS, FINANCING AND_5

12. BORROWINGS, FINANCING AND DEBENTURES (Details 2) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	R$ 23173635	R$ 22983942
Bank loans
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	13,484,023
Capital markets
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	8,882,827
Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	894,094
2020
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	6,753,338
2020 | Bank loans
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,187,269
2020 | Capital markets
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,499,177
2020 | Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	66,892
2021
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,439,268
2021 | Bank loans
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,263,810
2021 | Capital markets
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	116,003
2021 | Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	59,455
2022
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,182,553
2022 | Bank loans
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,087,732
2022 | Capital markets
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	36,667
2022 | Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	58,154
2023
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	4,082,376
2023 | Bank loans
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	2,669,211
2023 | Capital markets
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	1,356,180
2023 | Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	56,985
2024
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	1,343,735
2024 | Bank loans
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	1,276,001
2024 | Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	67,734
After 2024
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	584,874
After 2024 | Development agencies
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	584,874
Perpetual bonds
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	3,874,800
Perpetual bonds | Capital markets
Disclosure of detailed information about borrowings [line items]
Maturities of borrowings and financing	R$ 3874800

12. BORROWINGS, FINANCING AND_6

12. BORROWINGS, FINANCING AND DEBENTURES (Details 3) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Borrowings Financing And Debentures Details 2Abstract
New funding transactions and amortization, beginning	R$ 29510844	R$ 30441018
Funding raised	2,154,471	538,771
Principal repayments	(5,019,978)	(1,528,023)
Payments of charges	(2,141,710)	(2,634,931)
Provision of charges	2,009,688	2,438,555
Write-off - sale of subsidiary LLC	(10,544)
Others	2,324,303	255,454
New funding transactions and amortization, ending	R$ 28827074	R$ 29510844

12. BORROWINGS, FINANCING AND_7

12. BORROWINGS, FINANCING AND DEBENTURES (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Raised	R$ 2154471
Payment of Principal	5,019,978
Debt charges	2,141,710	R$ 2634931	R$ 3050036
Prepayment
Disclosure of detailed information about borrowings [line items]
Payment of Principal	849,654
Debt charges	280,923
Bonds
Disclosure of detailed information about borrowings [line items]
Raised	1,749,099
Payment of Principal	1,632,464
Debt charges	675,370
BNDES/FINAME
Disclosure of detailed information about borrowings [line items]
Raised	10,792
Payment of Principal	1,948,014
Debt charges	1,173,380
Other
Disclosure of detailed information about borrowings [line items]
Raised	394,580
Payment of Principal	589,846
Debt charges	R$ 12037

12. BORROWINGS, FINANCING AND_8

12. BORROWINGS, FINANCING AND DEBENTURES (Details 5) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 15565802	R$ 14948054
Tax foreclosure	38,498	25,376
Other	22,093	58,714
Total	3,649,736	15,032,144
Total in US$
Disclosure of detailed information about borrowings [line items]
Borrowings	2,950,000	2,950,000
Total		2,950,000
Total in EUR
Disclosure of detailed information about borrowings [line items]
Borrowings	123,000	145,000
Total		145,000
Total in R$
Disclosure of detailed information about borrowings [line items]
Borrowings		4,613,905
Tax foreclosure		25,376
Other		58,714
Total		4,697,995
Total in R$
Disclosure of detailed information about borrowings [line items]
Borrowings	3,589,145	10,334,149
Total	R$ 11976657	10,334,149
Transnordestina Logisitca
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	Until 09/19/2056 and Indefinite
Borrowings	R$ 2108917	2,541,347
Tax foreclosure	35,336	22,214
Other	8,231	3,866
Total	R$ 2152484	2,567,427
FTL - Ferrovia Transnordestina
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	11/15/2020
Borrowings	R$ 62407	69,405
Total	R$ 62407	69,405
Sepetiba Tecon
Disclosure of detailed information about borrowings [line items]
Currency	R$
Other		36,308
Total		36,308
Cia Metalurgica Prada
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	Indefinite
Tax foreclosure	R$ 333	333
Other	11,942	18,540
Total	R$ 12275	18,873
CSN Energia
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	Until 11/26/2023 and Undetermined
Tax foreclosure	R$ 2829	2,829
Other	1,920
Total	R$ 4749	2,829
CSN Mineracao
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	Until 12/26/2024
Borrowings	R$ 1407363	2,000,000
Total	R$ 1407363	2,000,000
Estanho de Rondonia
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	07/15/2022
Borrowings	R$ 3153	3,153
Total	R$ 3153	3,153
Nacional Minerios S.A.
Disclosure of detailed information about borrowings [line items]
Currency	R$
Maturities	Until 09/10/2021
Borrowings	R$ 7305
Total	R$ 7305
CSN Islands XI
Disclosure of detailed information about borrowings [line items]
Currency	US$
Maturities	09/21/2019
CSN Islands XI | USD
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 547094	750,000
Total		750,000
CSN Islands XII
Disclosure of detailed information about borrowings [line items]
Currency	US$
Maturities	Perpetual
CSN Islands XII | USD
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 1000000	1,000,000
Total		1,000,000
CSN Resources
Disclosure of detailed information about borrowings [line items]
Currency	US$
Maturities	Until 02/13/2023
CSN Resources | USD
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 1402906	1,200,000
Total		1,200,000
CSN Steel S.L.
Disclosure of detailed information about borrowings [line items]
Currency	EUR
Maturities	1/31/2020
CSN Steel S.L. | EUR
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 48000	120,000
Total		120,000
Lusosider Acos Planos
Disclosure of detailed information about borrowings [line items]
Currency	EUR
Maturities	Indefinite
Lusosider Acos Planos | EUR
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 75000	25,000
Total		R$ 25000

12. BORROWINGS, FINANCING AND_9

12. BORROWINGS, FINANCING AND DEBENTURES (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Borrowings Financing And Debentures Details Narrative Abstract
Accrued commision on risk assumption	R$ 38134	R$ 30843

13. FINANCIAL INSTRUMENTS (Deta

13. FINANCIAL INSTRUMENTS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss	R$ 2284043	R$ 2952
Other assets measured at amortized costs	6,806,001	41,528
Total assets	9,090,044	9,188,434
Fair value of liabilities through profit loss	33,348,569
Other liabilities measured at amortized costs	33,348,569	32,541,183
Total liabilities		32,541,183
Current assets
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss	4,854	2,952
Other assets measured at amortized costs	5,270,745	41,528
Total assets	5,275,599	6,391,283
Current assets | Cash and cash equivalants
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss
Other assets measured at amortized costs	2,248,004
Total assets	2,248,004	3,411,572
Current assets | Short-term investments
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss
Other assets measured at amortized costs	895,713
Total assets	895,713	735,712
Current assets | Trade receivables
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss
Other assets measured at amortized costs	2,078,182
Total assets	2,078,182	2,197,078
Current assets | Dividends receivable
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss
Other assets measured at amortized costs	46,171	41,528
Total assets	46,171	41,528
Current assets | Derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss	351
Other assets measured at amortized costs
Total assets	351
Current assets | Trading securities
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss	4,503	2,952
Other assets measured at amortized costs
Total assets	4,503	2,952
Current assets | Loans - related parties
Disclosure of detailed information about financial instruments [line items]
Other assets measured at amortized costs	2,675
Total assets	2,675
Non-current assets
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss	2,279,189
Other assets measured at amortized costs	1,535,256
Total assets	3,814,445	2,797,151
Non-current assets | Loans - related parties
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss
Other assets measured at amortized costs	706,605
Total assets	706,605	554,694
Non-current assets | Short-term investments
Disclosure of detailed information about financial instruments [line items]
Other assets measured at amortized costs	7,772
Total assets	7,772
Non-current assets | Other trade receivables
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss
Other assets measured at amortized costs	820,879
Total assets	820,879	20,024
Non-current assets | Investments
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit loss	2,279,189
Other assets measured at amortized costs
Total assets	2,279,189	2,222,433
Current liabilities
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss	10,087,624
Other liabilities measured at amortized costs	10,087,624	9,523,230
Total liabilities		9,523,230
Current liabilities | Derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss
Other liabilities measured at amortized costs
Total liabilities
Current liabilities | Borrowings and financing
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss	5,681,797
Other liabilities measured at amortized costs	5,681,797	6,551,764
Total liabilities		6,551,764
Current liabilities | Trade payables
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss	3,473,822
Other liabilities measured at amortized costs	3,473,822	2,460,774
Total liabilities		2,460,774
Current liabilities | Dividends and JCP
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss	932,005
Other liabilities measured at amortized costs	932,005	510,692
Total liabilities		510,692
Non-current liabilities
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss	23,260,945
Other liabilities measured at amortized costs	23,260,945	23,017,953
Total liabilities		23,017,953
Non-current liabilities | Borrowings and financing
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit loss	23,260,945
Other liabilities measured at amortized costs	R$ 23260945	23,017,953
Total liabilities		R$ 23017953

13. FINANCIAL INSTRUMENTS (De_2

13. FINANCIAL INSTRUMENTS (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Available for sale assets	R$ 2279189	R$ 2222433
Total assets	9,090,044	9,188,434
Fair value of liabilities through profit or loss	33,348,569
Total liabilities		32,541,183
Current assets
Disclosure of detailed information about financial instruments [line items]
Total assets	5,275,599	6,391,283
Current assets | Derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss	351
Total assets	351
Current assets | Derivative financial instruments | Level 1
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss
Current assets | Derivative financial instruments | Level 2
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss	351
Current assets | Trading securities
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss	4,503	2,952
Available for sale assets
Total assets	4,503	2,952
Current assets | Trading securities | Level 1
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss	4,503	2,952
Current assets | Trading securities | Level 2
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss
Non-current assets
Disclosure of detailed information about financial instruments [line items]
Total assets	3,814,445	2,797,151
Non-current assets | Investments
Disclosure of detailed information about financial instruments [line items]
Fair value of assets through profit or loss
Available for sale assets	2,279,189	2,222,433
Total assets	2,279,189	2,222,433
Non-current assets | Investments | Level 1
Disclosure of detailed information about financial instruments [line items]
Available for sale assets	2,279,189	2,222,433
Non-current assets | Investments | Level 2
Disclosure of detailed information about financial instruments [line items]
Available for sale assets
Assets
Disclosure of detailed information about financial instruments [line items]
Total assets	2,284,043	2,225,385
Assets | Level 1
Disclosure of detailed information about financial instruments [line items]
Total assets	2,283,692	2,225,385
Assets | Level 2
Disclosure of detailed information about financial instruments [line items]
Total assets	351
Current liabilities
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit or loss	R$ 10087624
Total liabilities		9,523,230
Current liabilities | Derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Fair value of liabilities through profit or loss
Total liabilities

13. FINANCIAL INSTRUMENTS (De_3

13. FINANCIAL INSTRUMENTS (Details 2) - BRL (R$) R$ / shares in Units, R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Quantity (in shares)	220,298,749	223,434,849
Closing Balance	R$ 2279189	R$ 2222433
Fair Value Adjustment Recognized in profit or loss	96,133
Reclassification of Comprehensive Income for the year (note 31)	R$ 1655813	R$ 0	R$ 0
Sale of shares, quantity	3,136,100
Sale of shares, share price	R$ 12.56
Sale of shares, Cash Received	R$ 39377
USIM3
Disclosure of detailed information about financial instruments [line items]
Quantity (in shares)	107,156,651	107,156,651
Share price	R$ 11.44	R$ 10.83
Closing Balance	R$ 1225872	R$ 1160506
Fair Value Adjustment Recognized in profit or loss	65,366
Reclassification of Comprehensive Income for the year (note 31)	R$ 694685
USIM5
Disclosure of detailed information about financial instruments [line items]
Quantity (in shares)	111,144,456	114,280,556
Share price	R$ 9.22	R$ 9.10
Closing Balance	R$ 1024752	R$ 1039953
Fair Value Adjustment Recognized in profit or loss	24,176
Reclassification of Comprehensive Income for the year (note 31)	R$ 865264
Sale of shares, quantity	3,136,100
Sale of shares, share price	R$ 12.56
Sale of shares, Cash Received	R$ 39377
PATI3
Disclosure of detailed information about financial instruments [line items]
Quantity (in shares)	1,997,642	1,997,642
Share price	R$ 14.30	R$ 11.00
Closing Balance	R$ 28565	R$ 21974
Fair Value Adjustment Recognized in profit or loss	6,591
Reclassification of Comprehensive Income for the year (note 31)	R$ 269

13. FINANCIAL INSTRUMENTS (De_4

13. FINANCIAL INSTRUMENTS (Details 3) R$ in Thousands	Dec. 31, 2018BRL (R$)
USD
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	R$ 475909
USD | Foreign exchange exposure
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(3,551,954)
USD | Cash flow hedge accounting
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	2,076,045
USD | Net foreign exchange exposure
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(1,475,909)
USD | Perpetual bonds
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	1,000,000
USD | Borrowings and financing
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(4,116,508)
USD | Trade payables
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(175,404)
USD | Other liabilities
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(3,529)
USD | Total liabilities
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(4,295,441)
USD | Cash and cash equivalents overseas
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	376,581
USD | Trade receivables
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	358,283
USD | Other assets
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	8,623
USD | Total assets
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	743,487
Euro
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(552)
Euro | Foreign exchange exposure
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(48,552)
Euro | Net Investment hedge accounting
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	48
Euro | Net foreign exchange exposure
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(552)
Euro | Borrowings and financing
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(48,791)
Euro | Trade payables
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(7,946)
Euro | Other liabilities
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(920)
Euro | Total liabilities
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	(57,657)
Euro | Cash and cash equivalents overseas
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	3,387
Euro | Trade receivables
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	1,124
Euro | Other assets
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	4,594
Euro | Total assets
Disclosure of detailed information about financial instruments [line items]
Foreign exchange exposure	R$ 9105

13. FINANCIAL INSTRUMENTS (De_5

13. FINANCIAL INSTRUMENTS (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Notional amount	R$ 18563
Asset position	71,967
Liability position	(71,616)
Fair market value of amounts receivable/(payable)	R$ 351
Dollar-to-euro swap
Disclosure of detailed information about financial instruments [line items]
Counterparty name	BCP
Notional amount	R$ 18563
Asset position	71,967
Liability position	(71,616)
Fair market value of amounts receivable/(payable)	351
Impact on finance income (cost)	R$ 1	R$ 28503

13. FINANCIAL INSTRUMENTS (De_6

13. FINANCIAL INSTRUMENTS (Details 5) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Current assets	R$ 351
Total assets	351
Dollar-to-euro swap
Disclosure of detailed information about financial instruments [line items]
Current assets	351
Total assets	351
Net finance income	(1)	R$ 28503
Forward dollar
Disclosure of detailed information about financial instruments [line items]
Net finance income	(1)	(229)
Fixed rate-to-CDI interest rate swap
Disclosure of detailed information about financial instruments [line items]
Net finance income	R$ 1	R$ 28274

13. FINANCIAL INSTRUMENTS (De_7

13. FINANCIAL INSTRUMENTS (Details 6) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)R$ / $
Disclosure of detailed information about hedged items [line items]
Designated amounts	R$ 2745045
Amortized part	(669,000)
Effect on Result	370,191
Impact on Shareholders' equity	R$ 1441295
Hedging relationship 1
Disclosure of detailed information about hedged items [line items]
Designation date	11/03/2014
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2016 - September 2019
Exchange rate on designation | R$ / $	2.4442
Designated amounts	R$ 500000
Amortized part	(250,003)
Effect on Result	171,983
Impact on Shareholders' equity	R$ 357649
Hedging relationship 2
Disclosure of detailed information about hedged items [line items]
Designation date	12/01/2014
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2015 - February 2019
Exchange rate on designation | R$ / $	2.5601
Designated amounts	R$ 175000
Amortized part	(154,999)
Effect on Result	36,766
Impact on Shareholders' equity	R$ 26295
Hedging relationship 3
Disclosure of detailed information about hedged items [line items]
Designation date	12/18/2014
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	May 2020
Exchange rate on designation | R$ / $	2.6781
Designated amounts	R$ 100000
Impact on Shareholders' equity	R$ 119670
Hedging relationship 4
Disclosure of detailed information about hedged items [line items]
Designation date	07/21/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	July 2019 - March 2021
Exchange rate on designation | R$ / $	3.1813
Designated amounts	R$ 60000
Impact on Shareholders' equity	R$ 41610
Hedging relationship 5
Disclosure of detailed information about hedged items [line items]
Designation date	07/23/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	July 2019 - March 2021
Exchange rate on designation | R$ / $	3.2850
Designated amounts	R$ 100000
Impact on Shareholders' equity	R$ 58980
Hedging relationship 6
Disclosure of detailed information about hedged items [line items]
Designation date	07/23/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.285
Designated amounts	R$ 30000
Amortized part	(6,000)
Effect on Result	5,102
Impact on Shareholders' equity	R$ 14155
Hedging relationship 7
Disclosure of detailed information about hedged items [line items]
Designation date	07/24/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.3254
Designated amounts	R$ 100000
Amortized part	(20,000)
Effect on Result	16,198
Impact on Shareholders' equity	R$ 43952
Hedging relationship 8
Disclosure of detailed information about hedged items [line items]
Designation date	07/27/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.3557
Designated amounts	R$ 25000
Amortized part	(5,000)
Effect on Result	3,898
Impact on Shareholders' equity	R$ 10382
Hedging relationship 9
Disclosure of detailed information about hedged items [line items]
Designation date	07/27/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.3557
Designated amounts	R$ 70000
Amortized part	(14,000)
Effect on Result	10,914
Impact on Shareholders' equity	R$ 29070
Hedging relationship 10
Disclosure of detailed information about hedged items [line items]
Designation date	07/27/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.3557
Designated amounts	R$ 30000
Amortized part	(6,000)
Effect on Result	4,677
Impact on Shareholders' equity	R$ 12458
Hedging relationship 11
Disclosure of detailed information about hedged items [line items]
Designation date	07/28/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.3815
Designated amounts	R$ 30000
Amortized part	(6,000)
Effect on Result	4,523
Impact on Shareholders' equity	R$ 11839
Hedging relationship 12
Disclosure of detailed information about hedged items [line items]
Designation date	3/8/2015
Hedging instrument	Export prepayments in US$ to third parties
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	October 2018 - October 2022
Exchange rate on designation | R$ / $	3.3940
Designated amounts	R$ 355000
Amortized part	(11,998)
Effect on Result	6,179
Impact on Shareholders' equity	R$ 164915
Hedging relationship 13
Disclosure of detailed information about hedged items [line items]
Designation date	04/02/2018
Hedging instrument	Bonds
Hedged item	Part of the highly probable future monthly iron ore exports
Type of hedged risk	Foreign exchange - R$ vs. US$ spot rate
Hedged period	July 2018 - February 2023
Exchange rate on designation | R$ / $	3.3104
Designated amounts	R$ 1170045
Amortized part	(195,000)
Effect on Result	109,951
Impact on Shareholders' equity	R$ 550320

13. FINANCIAL INSTRUMENTS (De_8

13. FINANCIAL INSTRUMENTS (Details 7) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedged items [line items]
Fair value of cash flow hedge, net of taxes, beginning	R$ 395524
Movement	1,415,962	R$ 50987	R$ 1005968
Realization	(370,191)	(92,140)	R$ 77444
Fair value of cash flow hedge, net of taxes, ending	1,441,295	395,524
Cash flow hedge accounting
Disclosure of detailed information about hedged items [line items]
Fair value of cash flow hedge, net of taxes, beginning	395,524
Movement	1,415,962
Realization	(370,191)
Fair value of cash flow hedge, net of taxes, ending	R$ 1441295	R$ 395524

13. FINANCIAL INSTRUMENTS (De_9

13. FINANCIAL INSTRUMENTS (Details 8) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)R$ / €
Disclosure of detailed information about hedged items [line items]
Designated amounts	R$ 2745045
Amortized part	(669,000)
Impact on Shareholders' equity	R$ 1441295
Foreign Subsidiaries
Disclosure of detailed information about hedged items [line items]
Designation date	9/1/2015
Hedging instrument	Non-derivative financial liabilities in EUR – Debt contract
Hedged item	Investments in subsidiaries which EUR is the functional currency
Type of hedged risk	Foreign exchange - R$ vs. EUR spot rate
Exchange rate on designation | R$ / €	4.0825
Designated amounts	R$ 120000
Amortized part	(72,000)
Impact on Shareholders' equity	R$ 3941

13. FINANCIAL INSTRUMENTS (D_10

13. FINANCIAL INSTRUMENTS (Details 9) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedged items [line items]
Movement	R$ 1415962	R$ 50987	R$ 1005968
Realization	(370,191)	(92,140)	R$ 77444
Foreign Subsidiaries
Disclosure of detailed information about hedged items [line items]
Fair value of net investment hedge in foreign operations, beginning	(17,911)
Movement	21,852
Realization
Fair value of net investment hedge in foreign operations, ending	3,941	(17,911)
Foreign Subsidiaries | Net Investment hedge accounting
Disclosure of detailed information about hedged items [line items]
Fair value of net investment hedge in foreign operations, beginning	(17,911)
Movement	21,852
Realization
Fair value of net investment hedge in foreign operations, ending	R$ 3941	R$ 17911

13. FINANCIAL INSTRUMENTS (D_11

13. FINANCIAL INSTRUMENTS (Details 10)	Dec. 31, 2018R$ / $R$ / €
USD
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	3.8748
USD | Probable Scenario
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	3.7626
USD | Scenario 1
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	4.8435
USD | Scenario 2
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	5.8122
EUR
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	4.4390
EUR | Probable Scenario
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	4.2833
EUR | Scenario 1
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	5.5488
EUR | Scenario 2
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	6.6585
USD x EUR
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	1.1456
USD x EUR | Probable Scenario
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	1.1346
USD x EUR | Scenario 1
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	1.4320
USD x EUR | Scenario 2
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate	1.7184

13. FINANCIAL INSTRUMENTS (D_12

13. FINANCIAL INSTRUMENTS (Details 11)	Dec. 31, 2018
CDI
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	6.40%
CDI | Scenario 1
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	8.00%
CDI | Scenario 2
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	9.60%
TJLP
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	6.98%
TJLP | Scenario 1
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	8.73%
TJLP | Scenario 2
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	10.47%
LIBOR
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	2.88%
LIBOR | Scenario 1
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	3.60%
LIBOR | Scenario 2
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	4.32%

13. FINANCIAL INSTRUMENTS (D_13

13. FINANCIAL INSTRUMENTS (Details 13) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
TJLP
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	6.98%
TJLP | Probable Scenario
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	R$ 2793
TJLP | Scenario 1
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	(16,658)
TJLP | Scenario 2
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	R$ 33316
LIBOR
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	2.88%
LIBOR | Probable Scenario
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	R$ 47391
LIBOR | Scenario 1
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	(34,505)
LIBOR | Scenario 2
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	R$ 69010
CDI
Disclosure of financial instruments by type of interest rate [line items]
Interest rate (in percent)	6.40%
CDI | Probable Scenario
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	R$ 53528
CDI | Scenario 1
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	(176,924)
CDI | Scenario 2
Disclosure of financial instruments by type of interest rate [line items]
Impact on profit or loss	R$ 353848

13. FINANCIAL INSTRUMENTS (D_14

13. FINANCIAL INSTRUMENTS (Details 14) R$ in Thousands	Dec. 31, 2018BRL (R$)
Borrowings, financing and debentures
Disclosure of financial liabilities [line items]
Contractual maturities	R$ 28942742
Borrowings, financing and debentures | Less than one year
Disclosure of financial liabilities [line items]
Contractual maturities	5,681,797
Borrowings, financing and debentures | From one to two years
Disclosure of financial liabilities [line items]
Contractual maturities	10,192,606
Borrowings, financing and debentures | From two to five years
Disclosure of financial liabilities [line items]
Contractual maturities	8,608,664
Borrowings, financing and debentures | Over five years
Disclosure of financial liabilities [line items]
Contractual maturities	4,459,675
Trade payables
Disclosure of financial liabilities [line items]
Contractual maturities	3,473,822
Trade payables | Less than one year
Disclosure of financial liabilities [line items]
Contractual maturities	3,473,822
Dividends and interest on capital
Disclosure of financial liabilities [line items]
Contractual maturities	932,005
Dividends and interest on capital | Less than one year
Disclosure of financial liabilities [line items]
Contractual maturities	R$ 932005

13. FINANCIAL INSTRUMENTS (D_15

13. FINANCIAL INSTRUMENTS (Details 15) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Perpetual bonds
Disclosure of financial liabilities [line items]
Carrying amount	R$ 3880074	R$ 3312503
Fair value	2,850,615	2,602,090
Fixed rate notes
Disclosure of financial liabilities [line items]
Carrying amount	6,745,132	5,751,526
Fair value	R$ 7595765	R$ 6207946

13. FINANCIAL INSTRUMENTS (D_16

13. FINANCIAL INSTRUMENTS (Details 16) R$ in Thousands	Dec. 31, 2018BRL (R$)	Dec. 31, 2017BRL (R$)	Dec. 31, 2016BRL (R$)	Dec. 31, 2015BRL (R$)
Financial Instruments Details 16Abstract
Shareholder's equity (equity)	R$ 10013440	R$ 8288229	R$ 7384521	R$ 7091288
Borrowings and Financing (Third-party capital)	R$ 28827074	R$ 29510844
Gross Debit/Shareholder's equity	2.88	3.56

13. FINANCIAL INSTRUMENTS (D_17

13. FINANCIAL INSTRUMENTS (Details Narrative) R$ in Thousands	12 Months Ended
	Dec. 31, 2017BRL (R$)
Financial Instruments Details Narrative Abstract
Investments available for sale, net of taxes	R$ 1559680

14. OTHER PAYABLES (Details)

14. OTHER PAYABLES (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	R$ 1704857	R$ 1014980
Other payables, noncurrent	227,328	129,323
Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	1,679,538	534,587
Other payables, noncurrent	24,024	57,599
Payables to related parties
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	35,499	3,097
Other payables, noncurrent	96,629
Payables to related parties | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	308,056	244,828
Other payables, noncurrent	14,501	49,254
Derivative financial instruments
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent
Derivative financial instruments | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent
Dividends and interest on capital payable
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	932,005	510,692
Other payables, noncurrent
Dividends and interest on capital payable | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	900,541	2,345
Other payables, noncurrent
Advances from customers
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	137,418	68,521
Other payables, noncurrent
Advances from customers | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	64,416	50,391
Other payables, noncurrent
Taxes in installments
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	20,179	21,551
Other payables, noncurrent	73,934	79,242
Taxes in installments | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	9,756	9,420
Other payables, noncurrent	2,378	1,421
Profit sharing - employees
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	113,219	42,699
Other payables, noncurrent
Profit sharing - employees | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	72,555	26,759
Other payables, noncurrent
Freight provision
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent
Freight provision | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent
Provision for industrial restructuring
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent
Provision for industrial restructuring | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent
Taxes payable
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent	8,631	8,410
Taxes payable | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current
Other payables, noncurrent	7,145	6,924
Other provision
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	392,612	336,886
Other payables, noncurrent
Other provision | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	275,973	194,619
Other payables, noncurrent
Third party materials in our possession
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	45,915	231
Other payables, noncurrent
Third party materials in our possession | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	45,721
Other payables, noncurrent
Other payables
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	28,010	31,303
Other payables, noncurrent	48,134	41,671
Other payables | Parent Company
Disclosure of fair value measurement of liabilities [line items]
Other payables, current	2,520	6,225
Other payables, noncurrent

15. INCOME TAX AND SOCIAL CON_3

15. INCOME TAX AND SOCIAL CONTRIBUTION (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax And Social Contribution Details Abstract
Income tax and social contribution income (expense), current	R$ 827229	R$ 358981	R$ 206178
Income tax and social contribution income (expense), deferred	576,895	(50,128)	(60,368)
Income tax and social contribution income (expense)	R$ 250334	R$ 409109	R$ 266546

15. INCOME TAX AND SOCIAL CON_4

15. INCOME TAX AND SOCIAL CONTRIBUTION (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of liabilities [line items]
(Loss)/Profit before income tax and social contribution	R$ 5450917	R$ 520338	R$ 576951
Tax rate (in percent)	34.00%	34.00%	34.00%
Income tax and social contribution at combined statutory rate	R$ 1853312	R$ 176915	R$ 196163
Adjustment to reflect the effective rate		(250,334)
Income tax and social contribution in profit for the period	(250,334)	(409,109)	(266,546)
Equity in results of affiliated companies
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	50,134	42,431	22,072
Profit with differentiated rates or untaxed
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(46,006)	37,605	(287,502)
Transfer pricing adjustment
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(74,836)	(34,746)	(63,638)
Tax loss carryforwards without recognizing deferred taxes
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(27,683)	(368,612)	(821,920)
Limit of Indebtedness
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(38,486)	(39,378)	(35,391)
Unrecorded deferred taxes on temporary differences
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(11,964)	541,655	643,990
Defered Income Tax and social contribution on temporary diferences
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	971,972
(Losses)/Reversal for deferred income and social contribution tax credits
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	835,937	(403,080)	44,691
Income tax and social contribution on foreign profit
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(30,219)	(29,964)	(35,613)
Goodwill amortization of Metalic
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate		31,439	31,439
Tax Incentives
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	36,710	14,358	22,673
Reversal of deferred tax in Namisa
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	(43,667)
Other permanent deductions (additions)
Disclosure of fair value measurement of liabilities [line items]
Adjustment to reflect the effective rate	R$ 18914	R$ 7537	R$ 16490

15. INCOME TAX AND SOCIAL CON_5

15. INCOME TAX AND SOCIAL CONTRIBUTION (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	R$ 1110440	R$ 976746
Movement in shareholders' equity	21,208	26,778
Movement in profit or loss	576,895	(50,128)
Other movement		(110,344)
Deferred tax asset/liability, ending	(512,337)	(1,110,440)
Total deferred assets			R$ 89394	R$ 63119	R$ 70151
Total deferred liabilities			(601,731)	(1,173,559)	(1,046,897)
Total deferred	(512,337)	(1,110,440)	(512,337)	(1,110,440)	(976,746)
Deferred income tax losses
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	1,137,234	970,800
Movement in profit or loss	(177,378)	245,846
Other movement	(616)	(79,412)
Deferred tax asset/liability, ending	959,240	1,137,234
Total deferred	1,137,234	1,137,234	959,240	1,137,234	970,800
Deferred social contribution tax losses
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	406,884	340,629
Movement in profit or loss	(39,303)	94,843
Other movement	(223)	(28,588)
Deferred tax asset/liability, ending	367,358	406,884
Total deferred	406,884	406,884	367,358	406,884	340,629
Temporary differences
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(2,654,558)	(2,288,175)
Movement in shareholders' equity	21,208	26,778
Movement in profit or loss	793,576	(390,817)
Other movement	839	(2,344)
Deferred tax asset/liability, ending	(1,838,935)	(2,654,558)
Total deferred	(2,654,558)	(2,654,558)	(1,838,935)	(2,654,558)	(2,288,175)
Provision for tax social security, labor, civil and environmental risks
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	269,899	256,936
Movement in profit or loss	(5,846)	12,963
Other movement	3,184
Deferred tax asset/liability, ending	267,237	269,899
Total deferred	269,899	269,899	267,237	269,899	256,936
Provision for environmental liabilities
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	86,851	95,048
Movement in profit or loss	(19,708)	(8,197)
Deferred tax asset/liability, ending	67,143	86,851
Total deferred	86,851	86,851	67,143	86,851	95,048
Assets impairment losses
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	88,433	93,908
Movement in profit or loss	(7,092)	(5,475)
Deferred tax asset/liability, ending	81,341	88,433
Total deferred	88,433	88,433	81,341	88,433	93,908
Inventory impairment losses
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	45,814	35,703
Movement in profit or loss	(7,054)	10,111
Deferred tax asset/liability, ending	38,760	45,814
Total deferred	45,814	45,814	38,760	45,814	35,703
(Gains )/ losses in financial instruments
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(912)	(2,300)
Movement in profit or loss	(2,407)	1,388
Deferred tax asset/liability, ending	(3,319)	(912)
Total deferred	(912)	(912)	(3,319)	(912)	(2,300)
(Gains )/losses on available for sale financial assets
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	417,659	705,929
Movement in shareholders' equity	530,292	316,563
Movement in profit or loss	(584,856)
Deferred tax asset/liability, ending	363,095	417,659
Total deferred	417,659	417,659	363,095	417,659	705,929
Actuarial liability (pension and healthcare plan)
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	273,058	134,578
Movement in shareholders' equity	(48)	180,834
Movement in profit or loss	3,022	(41,065)
Other movement		(1,289)
Deferred tax asset/liability, ending	276,032	273,058
Total deferred	273,058	273,058	276,032	273,058	134,578
Accrued supplies and services
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	67,716	123,101
Movement in profit or loss	27,928	(55,385)
Deferred tax asset/liability, ending	95,644	67,716
Total deferred	67,716	67,716	95,644	67,716	123,101
Allowance for doubtful debts
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	47,216	42,008
Movement in profit or loss	14,199	5,208
Deferred tax asset/liability, ending	61,415	47,216
Total deferred	47,216	47,216	61,415	47,216	42,008
Goodwil on merger
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	608	815
Movement in profit or loss	(608)	(207)
Deferred tax asset/liability, ending		608
Total deferred	608	608		608	815
Unrealized exchange differences
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	1,511,152	1,589,651
Movement in shareholders' equity		56,493
Movement in profit or loss	(500,620)	(134,992)
Deferred tax asset/liability, ending	1,010,532	1,511,152
Total deferred	1,511,152	1,511,152	1,010,532	1,511,152	1,589,651
(Gain) in control loss on Transnordestina
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(92,180)	(92,180)
Deferred tax asset/liability, ending	(92,180)	(92,180)
Total deferred	(92,180)	(92,180)	(92,180)	(92,180)	(92,180)
Cash flow hedge accounting
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	134,479	148,471
Movement in shareholders' equity	355,563	(13,992)
Deferred tax asset/liability, ending	490,042	134,479
Total deferred	134,479	134,479	490,042	134,479	148,471
Acquisition Fair Value SWT/CBL
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(193,311)	(199,001)
Movement in shareholders' equity	(16,683)	(21,143)
Movement in profit or loss	37,880	26,833
Deferred tax asset/liability, ending	(172,114)	(193,311)
Total deferred	(193,311)	(193,311)	(172,114)	(193,311)	(199,001)
Deferred taxes non computed
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(212,236)	(1,324,437)
Movement in shareholders' equity		(566,173)
Movement in profit or loss	(38,359)	(3,255)
Other movement	(2,345)	(115)
Deferred tax asset/liability, ending	(252,940)	(212,236)
Total deferred	(212,236)	(212,236)	(252,940)	(212,236)	(1,324,437)
Estimated (Losses)/reversals to deferred taxes credits
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(4,130,928)	(3,013,730)
Movement in shareholders' equity	(885,069)	82,769
Movement in profit or loss	1,929,424	(123,056)
Deferred tax asset/liability, ending	(3,086,573)	(4,130,928)
Total deferred	(4,130,928)	(4,130,928)	(3,086,573)	(4,130,928)	(3,013,730)
Business Combination
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	(1,040,536)	(1,072,824)
Movement in profit or loss	9,724	32,288
Deferred tax asset/liability, ending	(1,030,812)	(1,040,536)
Total deferred	(1,040,536)	(1,040,536)	(1,030,812)	(1,040,536)	(1,072,824)
Others
Disclosure of fair value measurement of liabilities [line items]
Deferred tax asset/liability, beginning	72,660	190,149
Movement in shareholders' equity	37,153	(8,573)
Movement in profit or loss	(62,051)	(107,976)
Other movement		(940)
Deferred tax asset/liability, ending	47,762	72,660
Total deferred	R$ 72660	R$ 72660	R$ 47762	R$ 72660	R$ 190149

15. INCOME TAX AND SOCIAL CON_6

15. INCOME TAX AND SOCIAL CONTRIBUTION (Details 3)	12 Months Ended
	Dec. 31, 2018
Tax losses
Disclosure of fair value measurement of liabilities [line items]
Description of deferred tax assets on tax losses and temporary differences	In recent periods, the Company started to incur in tax losses, mostly because of high financial expenses, as substantially all our loans and financings of CSN group, and presented a taxable income in 2018.
Foreign exchange differences
Disclosure of fair value measurement of liabilities [line items]
Description of deferred tax assets on tax losses and temporary differences	Since 2012 the Company opted by the taxation of exchange differences on a cash basis. As the Company have operated without taxable profit it would not make sense to use this deductibility year by year (accrual basis). As a result of the cash basis tax treatment, taxes are only due and expenses are only deductible at the time of debt settlement.
Losses on Usiminas shares
Disclosure of fair value measurement of liabilities [line items]
Description of deferred tax assets on tax losses and temporary differences	The losses on Usiminas shares are recognized on an accrual basis, but the taxable event will occur only at the time of divestment.
Other provisions
Disclosure of fair value measurement of liabilities [line items]
Description of deferred tax assets on tax losses and temporary differences	Various accounting provisions are recognized on an accrual basis, but their taxation occurs only at the time of its realization, such as provisions for contingencies, impairment losses, environmental liabilities, etc.

15. INCOME TAX AND SOCIAL CON_7

15. INCOME TAX AND SOCIAL CONTRIBUTION (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Tax Installments Programs Details 1Abstract
Actuarial gains on defined benefit pension plan	R$ 176700	R$ 176658
Estimated losses for deferred income and social contribution tax credits - actuarial gains	(180,048)	(180,834)
Changes in the fair value of assets measured at fair value through other comprehensive income		(530,292)
Estimated losses for deferred income tax and social contribution assets - assets measured at fair value through other comprehensive income		530,292
Exchange differences on translating foreign operations	(325,350)	(369,017)
Cash flow hedge accounting	490,041	134,478
Estimated losses for deferred income and social contribution tax credits - cash flow hedge	(490,041)	(134,478)
Income tax and social contribution	R$ 328698	R$ 373193

16. TAX INSTALLMENTS PROGRAMS_2

16. TAX INSTALLMENTS PROGRAMS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]
REFIS debts and other tax installment payment plans, current	R$ 20179	R$ 21551
REFIS debts and other tax installment payment plans, noncurrent	73,934	79,242
Federal REFIS Law 11.941/09
Disclosure of fair value measurement of liabilities [line items]
REFIS debts and other tax installment payment plans, current	12,100	12,552
REFIS debts and other tax installment payment plans, noncurrent	18,895	20,083
Federal REFIS Law 12.865/13
Disclosure of fair value measurement of liabilities [line items]
REFIS debts and other tax installment payment plans, current	6,240	5,984
REFIS debts and other tax installment payment plans, noncurrent	52,661	56,381
Other taxes in installments
Disclosure of fair value measurement of liabilities [line items]
REFIS debts and other tax installment payment plans, current	1,839	3,015
REFIS debts and other tax installment payment plans, noncurrent	R$ 2378	R$ 2778

17. PROVISION FOR TAX, SOCIAL_3

17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities	R$ 792456	R$ 825091
Judicial deposits	347,950	339,351
Provisions for tax, social security, labor and civil risks	106,503	105,958
Provision for environmental liabilities and decommissioning of assets	281,766	337,013
Deposit from banks		339,351
Tax
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities	118,490	113,451
Judicial deposits	46,321	52,542
Social security
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities	70,084	74,522
Judicial deposits	50,898	50,098
Labor
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities	362,228	451,173
Judicial deposits	214,625	202,104
Civil
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities	210,264	148,212
Judicial deposits	22,024	22,752
Environmental
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities	31,390	37,733
Judicial deposits	1,900	1,826
Deposit of a guarantee
Disclosure of fair value measurement of liabilities [line items]
Judicial deposits	R$ 12182	R$ 10029

17. PROVISION FOR TAX, SOCIAL_4

17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details 1) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities, beginning	R$ 825091
Additions	114,583
Accrued charges	54,678
Net utilization of reversal	(157,262)
Accrued liabilities, ending	792,456
Tax
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities, beginning	113,451
Additions	24,805
Accrued charges	6,325
Net utilization of reversal	(37,202)
Accrued liabilities, ending	118,490
Social security
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities, beginning	74,522
Additions	10,333
Accrued charges	3,121
Net utilization of reversal	(1,506)
Accrued liabilities, ending	70,084
Labor
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities, beginning	451,173
Additions	42,400
Accrued charges	33,330
Net utilization of reversal	(109,979)
Accrued liabilities, ending	362,228
Civil
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities, beginning	148,212
Additions	3,496
Accrued charges	11,681
Net utilization of reversal	(4,822)
Accrued liabilities, ending	210,264
Environmental
Disclosure of fair value measurement of liabilities [line items]
Accrued liabilities, beginning	37,733
Additions	33,549
Accrued charges	221
Net utilization of reversal	(3,753)
Accrued liabilities, ending	R$ 31390

17. PROVISION FOR TAX, SOCIAL_5

17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details 2) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	R$ 31612488	R$ 30639075
Tax assessment notice issued against the Company for an alleged sale of 40% of the shares of its joint venture NAMISA to a Japanese-Korean consortium
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	11,812,071	11,073,961
Income tax / Social contribution - Assessment Notice and Imposition of Fine (AIIM) - Disallowance of deductions of goodwill generated in the reverse incorporation of Big Jump by Namisa
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	3,722,888	2,623,179
Assessment Notice and Imposition of Fine (AIIM) - Income tax / Social contribution - gloss of interest on prepayment arising from supply contracts of iron ore and port services
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	2,165,088	2,500,606
Assessment Notice and Imposition of Fine (AIIM) - Income tax / Social contribution - Due to profits from foreign subsidiaries (years 2008, 2010 and 2011)
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	1,891,149	1,858,640
Tax foreclosures - ICMS - Electricity credits
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	974,479	920,306
Installments MP 470 - alleged insufficiency of tax losses
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss		704,739
Offset of taxes that were not approved by the Federal Revenue Service - IRPJ/CSLL, PIS/COFINS e IPI
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	1,481,382	1,685,648
Disallowance of the ICMS credits - Transfer of iron ore
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	529,607	499,006
ICMS - Refers to the transfer of imported raw material at an amount lower than the price disclosed in the import documentation
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	294,527	275,233
Disallowance of the tax losses arising on adjustments to the SAPLI
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	516,583	491,862
Assessment Notice - ICMS - shipping and return merchandise for Industrialization
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss		816,199
Assessment Notice- Income tax- Capital Gain of CFM vendors located outside
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	243,007	203,185
CFEM - Divergence on the understanding between CSN and DNPM on the calculation basis
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	311,582	290,249
Other tax (federal, state, and municipal) lawsuits
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	976,438	3,065,131
Assessment Notice - ICMS - Questions about sales to incentive zone
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	3,625,167	170,330
Social security lawsuits
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	287,823	278,600
Annulment action filed by CSN against CADE
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	101,683	98,189
Other civil lawsuits
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	922,171	1,111,944
Labor and social security lawsuits
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	1,537,078	1,569,712
Environmental lawsuits - ACP TAC/PAC - Compliance with environmental obligations
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss		216,878
Tax foreclosures - Fine of Volta Grande IV (2)
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	75,530	67,620
Others Environmental lawsuits
Disclosure of fair value measurement of liabilities [line items]
Legal matters with possible risk of loss	R$ 144235	R$ 117858

18. PROVISION FOR ENVIRONMENT_3

18. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]
Provision for environmental liabilities and decommissioning of assets	R$ 281766	R$ 337013
Environmental liabilities
Disclosure of fair value measurement of liabilities [line items]
Provision for environmental liabilities and decommissioning of assets	198,386	255,517
Asset retirement obligations
Disclosure of fair value measurement of liabilities [line items]
Provision for environmental liabilities and decommissioning of assets	R$ 83380	R$ 81496

19. RELATED-PARTY BALANCES AN_3

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
DisclosureOfRelatedpartyBalancesAndTransactionsLineItems [Line Items]
Proposed dividends	R$ 477553	R$ 0
Vicunha Acos
DisclosureOfRelatedpartyBalancesAndTransactionsLineItems [Line Items]
Proposed dividends	439,913
Rio Iaco Participacoes S.A.
DisclosureOfRelatedpartyBalancesAndTransactionsLineItems [Line Items]
Proposed dividends	R$ 37640

19. RELATED-PARTY BALANCES AN_4

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Current assets	R$ 238144	R$ 162987
Noncurrent assets	1,025,339	696,745
Current liabilities	171,300	138,071
Noncurrent liabilities	104,611	41,937
Total assets	1,263,483	859,732
Total liabilities	275,911	180,008
Accounts payable
Disclosure of transactions between related parties [line items]
Current liabilities	29,286	57,008
Noncurrent liabilities	96,629
Total liabilities	125,915	57,008
Provision for consumption and services
Disclosure of transactions between related parties [line items]
Current liabilities	6,213
Total liabilities	6,213
Trade payables
Disclosure of transactions between related parties [line items]
Current liabilities	135,801	81,063
Total liabilities	135,801	81,063
Actuarial liabilities
Disclosure of transactions between related parties [line items]
Noncurrent liabilities	7,982	41,937
Total liabilities	7,982	41,937
Trade receivables
Disclosure of transactions between related parties [line items]
Current assets	93,317	115,388
Total assets	93,317	115,388
Dividends receivable
Disclosure of transactions between related parties [line items]
Current assets	46,171	41,528
Total assets	46,171	41,528
Actuarial asset
Disclosure of transactions between related parties [line items]
Noncurrent assets	99,894	111,281
Total assets	99,894	111,281
Short-term investments/Investments
Disclosure of transactions between related parties [line items]
Current assets	92,332	53
Total assets	92,332	53
Loans
Disclosure of transactions between related parties [line items]
Current assets	2,675	2,441
Noncurrent assets	706,605	554,694
Total assets	709,280	557,135
Other receivables
Disclosure of transactions between related parties [line items]
Current assets	3,649	3,577
Noncurrent assets	218,840	30,770
Total assets	R$ 222489	R$ 34347

19. RELATED-PARTY BALANCES AN_5

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Related party revenues	R$ 1278751	R$ 880145	R$ 878992
Related party expenses	(1,418,282)	(1,176,930)	(1,099,851)
Foreign exchange and monetary variation, net	13,611		(18,398)
Related party transactions, net	(77,124)	(235,236)	(181,478)
Purchases
Disclosure of transactions between related parties [line items]
Related party expenses	(1,418,282)	(1,176,930)	(1,099,851)
Interest
Disclosure of transactions between related parties [line items]
Related party expenses	(16,092)		(3,185)
Sales
Disclosure of transactions between related parties [line items]
Related party revenues	1,278,751	880,145	878,992
Interest
Disclosure of transactions between related parties [line items]
Related party revenues	R$ 64888	R$ 61549	R$ 60964

19. RELATED-PARTY BALANCES AN_6

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 3) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Current assets	R$ 238144	R$ 162987
Noncurrent assets	1,025,339	696,745
Total assets	1,263,483	859,732
Current liabilities	171,300	138,071
Noncurrent liabilities	104,611	41,937
Total liabilities	275,911	R$ 180008
Other Related Parties
Disclosure of transactions between related parties [line items]
Current assets	147,453
Noncurrent assets	99,894
Total assets	247,347
Current liabilities	16,472
Noncurrent liabilities	7,982
Total liabilities	24,454
CBS Previdencia | Other Related Parties
Disclosure of transactions between related parties [line items]
Noncurrent assets	99,894
Total assets	99,894
Noncurrent liabilities	7,982
Total liabilities	7,982
Banco Fibra | Other Related Parties
Disclosure of transactions between related parties [line items]
Current assets	92,334
Total assets	92,334
Panatlantica | Other Related Parties
Disclosure of transactions between related parties [line items]
Current assets	53,027
Total assets	53,027
Current liabilities	15,643
Total liabilities	15,643
Other | Other Related Parties
Disclosure of transactions between related parties [line items]
Current assets	2,092
Total assets	2,092
Current liabilities	829
Total liabilities	829
Arvedi Metalfer do Brasil S.A. | Associates
Disclosure of transactions between related parties [line items]
Current assets	42,834
Total assets	42,834
Joint Venture/Joint Operation
Disclosure of transactions between related parties [line items]
Current assets	47,857
Noncurrent assets	925,445
Total assets	973,302
Current liabilities	154,828
Noncurrent liabilities	96,629
Total liabilities	251,457
Joint Venture/Joint Operation | Ita Energetica S.A.
Disclosure of transactions between related parties [line items]
Current liabilities	2,550
Total liabilities	2,550
Joint Venture/Joint Operation | MRS Logistica S.A.
Disclosure of transactions between related parties [line items]
Current assets	46,243
Total assets	46,243
Current liabilities	101,264
Noncurrent liabilities	96,629
Total liabilities	197,893
Joint Venture/Joint Operation | CBSI
Disclosure of transactions between related parties [line items]
Current assets	3
Total assets	3
Current liabilities	37,362
Total liabilities	37,362
Joint Venture/Joint Operation | Transnordestina Logistica S.A.
Disclosure of transactions between related parties [line items]
Current assets	1,611
Noncurrent assets	925,445
Total assets	927,056
Current liabilities	13,652
Total liabilities	R$ 13652

19. RELATED-PARTY BALANCES AN_7

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Related party sales	R$ 1278751	R$ 880145	R$ 878992
Related party purchases	(1,418,282)	(1,176,930)	(1,099,851)
Relared party finance income and costs, net	48,796		57,779
Foreign exchange and monetary variation, net	13,611		(18,398)
Related party transactions, net	(77,124)		(181,478)
AssociatesMember | Discontinued operations [member]
Disclosure of transactions between related parties [line items]
Related party sales			43,250
Related party purchases			(138)
Relared party finance income and costs, net			(130)
Related party transactions, net			42,982
Arvedi Metalfer do Brasil | AssociatesMember
Disclosure of transactions between related parties [line items]
Related party sales	100,608
Relared party finance income and costs, net	234
Related party transactions, net	100,842
Arvedi Metalfer do Brasil S,A, | AssociatesMember
Disclosure of transactions between related parties [line items]
Related party sales			31,026
Relared party finance income and costs, net			2,995
Related party transactions, net			34,021
Joint Venture/Joint Operation
Disclosure of transactions between related parties [line items]
Related party sales	414	2,604	5,057
Related party purchases	(1,307,694)	(1,125,228)	(1,082,272)
Relared party finance income and costs, net	33,911	53,261	55,758
Related party transactions, net	(1,273,369)	(1,069,363)	(1,021,457)
Joint Venture/Joint Operation | Ita Energetica
Disclosure of transactions between related parties [line items]
Related party purchases		(32,275)	(32,363)
Related party transactions, net		(32,275)	(32,363)
Joint Venture/Joint Operation | MRS Logistica
Disclosure of transactions between related parties [line items]
Related party purchases	(1,111,695)	(934,279)	(903,030)
Relared party finance income and costs, net	(16,092)
Related party transactions, net	(1,127,787)	(934,279)	(903,030)
Joint Venture/Joint Operation | CBSI - Companhia Brasileira de Servicos e Infraestrutura
Disclosure of transactions between related parties [line items]
Related party sales	47	55	18
Related party purchases	(180,332)	(150,758)	(138,374)
Related party transactions, net	(180,285)	(150,703)	(138,356)
Joint Venture/Joint Operation | Transnordestina Logistica S,A
Disclosure of transactions between related parties [line items]
Related party sales	367	2,549	5,039
Related party purchases	(15,667)	(7,916)	(8,505)
Relared party finance income and costs, net	50,003	53,261	55,758
Related party transactions, net	34,703	47,894	52,292
Other Related Parties
Disclosure of transactions between related parties [line items]
Related party sales	1,177,729	874,881	799,659
Related party purchases	(110,588)	(51,702)	(17,441)
Relared party finance income and costs, net	14,651	6,290	(844)
Foreign exchange and monetary variation, net	13,611		(18,398)
Related party transactions, net	1,095,403	829,469	762,976
Other Related Parties | Fundacao CSN
Disclosure of transactions between related parties [line items]
Related party purchases		(4,045)	(4,045)
Related party transactions, net		(4,045)	(4,045)
Other Related Parties | Banco Fibra
Disclosure of transactions between related parties [line items]
Relared party finance income and costs, net	14,651	(844)	(844)
Foreign exchange and monetary variation, net	13,611	(18,398)	(18,398)
Related party transactions, net	28,262	(19,242)	(19,242)
Other Related Parties | Usiminas
Disclosure of transactions between related parties [line items]
Related party sales		17,027	17,027
Related party purchases	(382)	(6,026)	(6,026)
Related party transactions, net	(382)	11,001	11,001
Other Related Parties | Panatlantica
Disclosure of transactions between related parties [line items]
Related party sales	1,174,984	779,503	779,503
Related party purchases	(94,515)
Related party transactions, net	1,080,469	779,503	779,503
Other Related Parties | Ibis Participacoes e Servicos
Disclosure of transactions between related parties [line items]
Related party sales		47	47
Related party purchases	(4,501)	(7,370)	(7,370)
Related party transactions, net	(4,501)	(7,323)	R$ 7323
Other Related Parties | Other
Disclosure of transactions between related parties [line items]
Related party sales	2,745	3,082
Related party purchases	(11,190)
Related party transactions, net	R$ 8445	3,082
Other Related Parties | Partfib Projetos Imobiliarios
Disclosure of transactions between related parties [line items]
Related party sales		2,821
Related party transactions, net		2,821
Other Related Parties | Vicunha Textil S.A.
Disclosure of transactions between related parties [line items]
Related party purchases		(232)
Related party transactions, net		(232)
Other Related Parties | Vicunha Servicos Ltda.
Disclosure of transactions between related parties [line items]
Related party purchases		(61)
Related party transactions, net		R$ 61

19. RELATED-PARTY BALANCES AN_8

19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 5) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Relatedparty Balances And Transactions Details 4Abstract
Short-term benefits for employees and officers	R$ 32848	R$ 39721	R$ 71852
Post-employment benefits	105	110	306
Key management personnel compensation	R$ 32953	R$ 39831	R$ 71158

20. SHAREHOLDERS' EQUITY (Detai

20. SHAREHOLDERS' EQUITY (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Number of common shares outstanding	1,387,524,047	1,387,524,047
Percent of total shares	100.00%	100.00%
USIM3
Number of common shares outstanding	1,380,114,547
Percent of total shares	99.47%
Percent of voting capital	100.00%
Treasury shares
Number of common shares outstanding	7,409,500	30,391,000
Percent of total shares	0.53%	2.19%
Common
Number of common shares outstanding		1,357,133,047
Percent of total shares		97.81%
Percent of voting capital		100.00%
Vicunha Acos S.A.
Number of common shares outstanding	679,522,254	682,855,454
Percent of total shares	48.97%	49.21%
Percent of voting capital	49.24%	50.32%
Rio Iaco Participacoes S.A.
Number of common shares outstanding	58,193,503	58,193,503
Percent of total shares	4.19%	4.19%
Percent of voting capital	4.22%	4.29%
NYSE (ADRs)
Number of common shares outstanding	284,152,319	303,590,364
Percent of total shares	20.48%	21.88%
Percent of voting capital	20.59%	22.37%
Other
Number of common shares outstanding	358,246,471	312,493,726
Percent of total shares	25.82%	22.52%
Percent of voting capital	25.95%	23.02%

20. SHAREHOLDERS' EQUITY (Det_2

20. SHAREHOLDERS' EQUITY (Details 1) - R$ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Average buyback price	R$ 7.86
Number bought back	7,409,500
Balance in treasury	1,387,524,047	1,387,524,047
Buyback program 1
Board's Authorization	3/13/2014
Authorized quantity	70,205,661
Program Period	From 3/14/2014 to 4/14/2014
Average buyback price	R$ 9.34
Minimum and maximum buyback price	R$ 9,22 and R$ 9,45
Number bought back	2,350,000
Balance in treasury	2,350,000
Buyback program 2
Board's Authorization	4/15/2014
Authorized quantity	67,855,661
Program Period	From 4/16/2014 to 5/23/2014
Average buyback price	R$ 8.97
Minimum and maximum buyback price	R$ 8,70 and R$ 9,48
Number bought back	9,529,500
Balance in treasury	11,879,500
Buyback program 3
Board's Authorization	5/23/2014
Authorized quantity	58,326,161
Program Period	From 5/26/2014 to 6/25/2014
Average buyback price	R$ 9.21
Minimum and maximum buyback price	R$ 8,61 and R$ 9,72
Number bought back	31,544,500
Balance in treasury	43,424,000
Buyback program 4
Board's Authorization	6/26/2014
Authorized quantity	26,781,661
Program Period	From 6/26/2014 to 7/17/2014
Average buyback price	R$ 10.42
Minimum and maximum buyback price	R$ 9,33 and R$ 11,54
Number bought back	26,781,661
Balance in treasury	70,205,661
Buyback program 4 (2)
Board's Authorization	7/18/2014
Average buyback price
Minimum and maximum buyback price	Not applicable
Share cancelation	60,000,000
Balance in treasury	10,205,661
Buyback program 5
Board's Authorization	7/18/2014
Authorized quantity	64,205,661
Program Period	From 7/18/2014 to 8/18/2014
Average buyback price	R$ 11.40
Minimum and maximum buyback price	R$ 11.40
Number bought back	240,400
Balance in treasury	10,446,061
Buyback program 5 (2)
Board's Authorization	8/18/2014
Average buyback price
Minimum and maximum buyback price	Not applicable
Share cancelation	10,446,061
Buyback program 6
Board's Authorization	8/18/2014
Authorized quantity	63,161,055
Program Period	From 8/19/2014 to 9/25/2014
Average buyback price	R$ 9.82
Minimum and maximum buyback price	R$ 9,47 and R$ 10,07
Number bought back	6,791,300
Balance in treasury	6,791,300
Buyback program 7
Board's Authorization	9/29/2014
Authorized quantity	56,369,755
Program Period	From 9/29/2014 to 2/29/2014
Average buyback price	R$ 7.49
Minimum and maximum buyback price	R$ 4,48 and R$ 9,16
Number bought back	21,758,600
Balance in treasury	28,549,900
Buyback program 8
Board's Authorization	12/30/2014
Authorized quantity	34,611,155
Program Period	From 12/31/2014 to 3/31/2015
Average buyback price	R$ 5.10
Minimum and maximum buyback price	R$ 4,90 and R$ 5,39
Number bought back	1,841,100
Balance in treasury	30,391,000
Buyback program 9
Board's Authorization	03/31/2015
Authorized quantity	32,770,055
Program Period	From 4/01/2015 to 6/30/2015
Balance in treasury	30,391,000
Buyback program 9 (2)
Board's Authorization	04/20/2018
Authorized quantity	30,391,000
Program Period	From 4/20/2018 to 4/30/2018
Average buyback price
Minimum and maximum buyback price	Não aplicável
Number bought back	0
Share cancelation	0
Disposal of shares	22,981,500
Balance in treasury	7,409,500

20. SHAREHOLDERS' EQUITY (Det_3

20. SHAREHOLDERS' EQUITY (Details 2) - BRL (R$) R$ / shares in Units, R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Shareholders Equity Details 2Abstract
Treasury share purchased	7,409,500
Amount paid for treasury share	R$ 58264	R$ 238976
Minimum share price	R$ 4.48
Maximum share price	10.07
Average share price	R$ 7.86
Treasury share market price	R$ 65500

20. SHAREHOLDERS' EQUITY (Det_4

20. SHAREHOLDERS' EQUITY (Details 3) - BRL (R$) R$ / shares in Units, R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
(Loss) profit for the year
Continued operations	R$ 5074136	R$ 10272	R$ 925186
Discontinued operations	0	0	(9,561)
(Loss) profit for the year	R$ 5074136	R$ 10272	R$ 934747
Weighted average number of shares	1,373,250,595	1,357,133,047	1,357,133,047
Basic and diluted EPS
Continued Operations	R$ 3.69498	R$ 0.00757	R$ 0.68172
Discontinued Operations	0	0	(0.00704)
Basic and diluted EPS	R$ 3.69498	R$ 0.00757	R$ 0.68876

20. SHAREHOLDERS' EQUITY (Det_5

20. SHAREHOLDERS' EQUITY (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Shareholders Equity Details Narrative Abstract
Issued capital	R$ 4540000	R$ 4540000
Number of common shares outstanding	1,387,524,047	1,387,524,047

21. PAYMENT TO SHAREHOLDERS (De

21. PAYMENT TO SHAREHOLDERS (Details) - BRL (R$) R$ / shares in Units, R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payment To Shareholders Details Abstract
Profit for the year	R$ 5074136	R$ 10272	R$ 934747
Absorption of deficits	(1,291,689)
Legal reserve	(189,122)
Allocation of profits	3,593,325
Proposed destination:
Mandatory minimum dividends	(898,332)
Intended for statutory reserve of working capital	(2,694,993)
In current liabilities
Dividends to be paid on December 31, 2017	2,209
Mandatory minimum dividends	898,332
Dividends to be paid on December 31, 2018	R$ 900541	R$ 2209
Weighted average number of shares	1,373,251
Dividends per share approved	R$ 0.65416

21. PAYMENT TO SHAREHOLDERS (_2

21. PAYMENT TO SHAREHOLDERS (Details 1) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Approved dividends	R$ 898332
Dividend 1
Disclosure of terms and conditions of share-based payment arrangement [line items]
Approval year	2017 (*)
Approved dividends	R$ 0
Payment year	2017
Paid dividends	R$ 0
Dividend 2
Disclosure of terms and conditions of share-based payment arrangement [line items]
Approval year	2018
Approved dividends	R$ 898332
Payment year	2018
Paid dividends	R$ 0

22. NET SALES AND SERVICES RE_3

22. NET SALES AND SERVICES REVENUE (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]
Gross revenue	R$ 26570460	R$ 21467583	R$ 19777825
Sales returns and discounts	(234,851)	(262,989)	(190,415)
Taxes on sales	(3,366,724)	(2,679,993)	(2,438,461)
Deductions	(3,601,575)	(2,942,982)	(2,628,876)
Net revenues	22,968,885	18,524,601	17,148,949
Domestic market
Disclosure of disaggregation of revenue from contracts with customers [line items]
Gross revenue	14,752,901	11,487,011	10,206,195
Net revenues	11,353,437	8,706,466	7,729,913
Foreign market
Disclosure of disaggregation of revenue from contracts with customers [line items]
Gross revenue	11,817,559	9,980,572	9,571,630
Net revenues	R$ 11615448	R$ 9818135	R$ 9419036

23. EXPENSES BY NATURE (Details

23. EXPENSES BY NATURE (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	R$ 18863368	R$ 15827089	R$ 14855170
Cost of sales and services	(16,105,657)	(13,596,141)	(12,640,042)
Selling expenses	(2,263,688)	(1,815,107)	(1,696,896)
General and administrative expenses	(494,023)	(415,841)	(518,232)
Raw materials and inputs
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(6,759,275)	(5,404,801)	(4,518,718)
Labor cost
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(2,743,460)	(2,400,579)	(2,482,111)
Supplies
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(1,782,576)	(1,451,437)	(1,384,437)
Maintenance cost (services and materials)
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(1,326,894)	(1,145,974)	(1,203,294)
Outsourcing services
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(2,368,387)	(2,062,352)	(2,228,786)
Freight
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(1,802,541)	(1,362,087)	0
Depreciation, amortization and depletion
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	(1,175,107)	(1,408,765)	(1,278,816)
Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expenses by Nature	R$ 905128	R$ 591094	R$ 495274

23. EXPENSES BY NATURE (Detai_2

23. EXPENSES BY NATURE (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses By Nature Details 1Abstract
Production costs	R$ 1145793	R$ 1376862	R$ 1241425
Sales expenses	5,850	8,851	9,163
General and Administrative Expenses	23,464	23,052	28,228
Depreciation, amortization and depletion	1,175,107	1,408,765	1,278,816
Other operating expenses	(1,330,706)	(646,944)	(1,076,730)
Total	R$ 1273021	R$ 1453335	R$ 1322497

24. OTHER OPERATING INCOME (E_3

24. OTHER OPERATING INCOME (EXPENSES) (Details) - BRL (R$) R$ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	R$ 4036043	R$ 824286	R$ 663509
Other operating expenses	(1,330,706)	(646,944)	(1,076,730)
Other operating income (expenses), net	2,705,337	177,342	(413,221)
Taxes and fees
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(26,197)	(136,348)	(88,249)
Write-off / (Provision) of judicial deposits
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(54,330)	(38,258)	(64,886)
Expenses with environmental liabilities, net
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(60,311)	(7,156)	(5,023)
Expenses from tax, social security, labor, civil and environmental law suits
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(59,219)	(95,744)
Contractual fines
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(104,086)
Depreciation of unused equipment and amortization of intangible assets
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(97,914)	(44,570)	(43,681)
Write off of PP&E and Intangible assets
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(27,260)	(28,127)	(88,339)
Losses /reversals estimated in inventories
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(149,704)	(12,903)	(29,316)
Losses on spare parts
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses		(2,872)
Studies and project engineering expenses
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(33,738)	(32,956)	(31,156)
Research and development expenses
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(2,688)	(3,944)		R$ 2269
Advisory expenses
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(508)	(3,419)	(20,865)
Healthcare plan expenses
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(108,369)	(97,837)	(80,489)
Provisions/(Provision) for industrial restructuring
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(17,490)	5,807	96,390
Hedge cash flow realized
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(370,191)	(92,140)	(77,444)
Impairment of fair value of Transnordestina
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses			(387,989)
Other expenses
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating expenses	(218,701)	(56,477)	(85,256)
Indemnities/gains on lawsuits
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	46,256	6,106	26,871
Rentals and leases
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	5,430	1,841	1,483
Dividends received
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	9,188	3,248	567
Extemporaneous PIS/COFINS credits
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	1,102,365		203,504
Contractual fines
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	3,965	2,970	2,501
Gain on business combination
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income			66,496
Actuarial pension plan
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	20,983	36,952	48,790
Updated shares - VJR
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	1,655,813
Gain on sale of LLC
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	1,164,294
Other revenues
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income	R$ 27749	18,018	61,274
Gain on sales of assets held for sale
Disclosure of disaggregation of revenue from contracts with customers [line items]
Other operating income		R$ 755151	R$ 252023

25. FINANCIAL INCOME (EXPENSE_3

25. FINANCIAL INCOME (EXPENSES) (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial income	R$ 1310514	R$ 295074	R$ 643590
Financial expenses	(2,806,157)	(2,758,701)	(3,166,017)
Inflation adjustment and exchange differences, net	(533,919)		116,948
Financial income (expense), net	(1,495,643)	(2,463,627)	(2,522,427)
Statement of gains and (losses) on derivative transactions	(1)	28,274	(812,227)
Dollar-to-euro swap
Disclosure of disaggregation of revenue from contracts with customers [line items]
Statement of gains and (losses) on derivative transactions	(1)	(229)	(6,467)
Future DI
Disclosure of disaggregation of revenue from contracts with customers [line items]
Statement of gains and (losses) on derivative transactions		28,503	5,829
Future Dollar
Disclosure of disaggregation of revenue from contracts with customers [line items]
Statement of gains and (losses) on derivative transactions			(805,760)
Swap Pre x CDI
Disclosure of disaggregation of revenue from contracts with customers [line items]
Statement of gains and (losses) on derivative transactions			(299)
Swap CDI x Pre
Disclosure of disaggregation of revenue from contracts with customers [line items]
Statement of gains and (losses) on derivative transactions			(63)
Borrowings and financing - foreign currency
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	(988,821)	(827,841)	(930,508)
Borrowings and financing - local currency
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	(1,020,867)	(1,610,714)	(2,229,849)
Related parties
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	(16,092)		(3,185)
Capitalized interest
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	71,611	91,957	215,794
Losses on derivatives
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses			(362)
Interest, fines and late payment charges
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	(71,100)	(72,343)	(38,002)
Commission and bank fees
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	(182,179)	(159,088)	(155,249)
PIS/COFINS over financial income
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	(84,404)	(21,926)	(39,154)
Other financial expenses
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses	19,614	(142,296)	(102,450)
Inflation adjustment and exchange differences, net
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses		(16,450)
Inflation adjustment and exchange differences, net	(1,035)		7,865
Inflation adjustments, net
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses		(10,556)
Exchange differences, net
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses		(5,665)
Inflation adjustment and exchange differences, net	(532,883)		921,310
Exchange gain (losses) on derivatives
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial expenses		(229)
Inflation adjustment and exchange differences, net	(1)		(812,227)
Related parties
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial income	64,888	61,549	60,964
Income from financial investments
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial income	111,235	162,292	301,401
Gain from derivative
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial income		28,503	5,829
Gain on repurchase of debt securities
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial income			146,214
Other income
Disclosure of disaggregation of revenue from contracts with customers [line items]
Financial income	R$ 1134391	R$ 42730	R$ 129182

26. SEGMENT INFORMATION (Detail

26. SEGMENT INFORMATION (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating segments [line items]
Net revenues	R$ 22968885	R$ 18524601	R$ 17148949
Cost of sales and services	(16,105,657)	(13,596,141)	(12,640,042)
Gross profit	6,863,228	4,928,460	4,508,907
General and administrative expenses	(2,757,711)	(2,230,948)	(2,215,128)
Depreciation	1,175,107	1,408,765	1,278,816
Proportionate EBITDA of joint ventures	568,045	538,170	502,345
Adjusted EBITDA	5,848,669	4,644,447	4,074,940
Domestic market
Disclosure of operating segments [line items]
Net revenues	11,353,437	8,706,466	7,729,913
Foreign market
Disclosure of operating segments [line items]
Net revenues	R$ 11615448	R$ 9818135	R$ 9419036
Steel
Disclosure of operating segments [line items]
Metric tons (Thou.)	5,068,758	4921719	4,857,174
Net revenues	R$ 15634143	R$ 12959023	R$ 11515908
Cost of sales and services	12,613,216	(10,537,547)	9,393,237
Gross profit	3,020,927	2,421,476	2,122,671
General and administrative expenses	(984,980)	(963,822)	(914,927)
Depreciation	609,274	658,587	679,074
Adjusted EBITDA	2,645,221	2,116,241	1,886,818
Steel | Domestic market
Disclosure of operating segments [line items]
Net revenues	10,328,372	7,818,552	6,980,087
Steel | Foreign market
Disclosure of operating segments [line items]
Net revenues	R$ 5305771	R$ 5140471	R$ 4535821
Mining
Disclosure of operating segments [line items]
Metric tons (Thou.)	34,780,756	32576843	36,983,297
Net revenues	R$ 5984781	R$ 4620971	R$ 4581903
Cost of sales and services	3,585,691	(3,005,840)	3,099,236
Gross profit	2,399,090	1,615,131	1,482,667
General and administrative expenses	(144,754)	(158,958)	(185,149)
Depreciation	366,547	490,805	461,287
Adjusted EBITDA	2,620,883	1,946,978	1,758,805
Mining | Domestic market
Disclosure of operating segments [line items]
Net revenues	972,360	829,268	542,028
Mining | Foreign market
Disclosure of operating segments [line items]
Net revenues	5,012,421	3,791,703	4,039,875
Port
Disclosure of operating segments [line items]
Net revenues	266,378	238,240	207,722
Cost of sales and services	189,999	(156,997)	141,542
Gross profit	76,379	81,243	66,180
General and administrative expenses	(35,423)	(27,943)	(25,180)
Depreciation	20,368	15,752	13,430
Adjusted EBITDA	61,324	69,052	54,430
Port | Domestic market
Disclosure of operating segments [line items]
Net revenues	266,378	238,240	207,722
Port | Foreign market
Disclosure of operating segments [line items]
Net revenues
Railroads
Disclosure of operating segments [line items]
Net revenues	1,506,114	1,416,612	1,319,907
Cost of sales and services	1,049,071	(1,024,696)	914,361
Gross profit	457,043	391,916	405,546
General and administrative expenses	(106,412)	(94,921)	(83,020)
Depreciation	258,985	294,571	227,792
Adjusted EBITDA	609,616	591,566	550,318
Railroads | Domestic market
Disclosure of operating segments [line items]
Net revenues	1,506,114	1,416,612	1,319,907
Railroads | Foreign market
Disclosure of operating segments [line items]
Net revenues
Energy
Disclosure of operating segments [line items]
Net revenues	410,606	407,671	269,095
Cost of sales and services	286,734	(285,085)	195,994
Gross profit	123,872	122,586	73,101
General and administrative expenses	(27,948)	(27,098)	(25,196)
Depreciation	17,285	17,265	17,140
Adjusted EBITDA	113,209	112,753	65,045
Energy | Domestic market
Disclosure of operating segments [line items]
Net revenues	410,606	407,671	269,095
Energy | Foreign market
Disclosure of operating segments [line items]
Net revenues
Cement
Disclosure of operating segments [line items]
Metric tons (Thou.)		3,313,061
Net revenues	588,230	R$ 487129	490,608
Cost of sales and services	544,266	(512,762)	467,373
Gross profit	43,964	(25,633)	23,235
General and administrative expenses	(95,893)	(80,823)	(74,528)
Depreciation	115,411	121,801	73,030
Adjusted EBITDA	63,482	15,345	21,737
Cement | Domestic market
Disclosure of operating segments [line items]
Net revenues	588,230	487,129	R$ 490608
Cement | Foreign market
Disclosure of operating segments [line items]
Net revenues
Corporate expenses/elimination
Disclosure of operating segments [line items]
Metric tons (Thou.)		(5,359,571)	(4,062,774)
Net revenues	(1,421,367)	R$ 1605045	R$ 1236194
Cost of sales and services	(2,163,320)	1,926,786	(1,571,701)
Gross profit	741,953	321,741	335,507
General and administrative expenses	(1,362,301)	(877,383)	(907,128)
Depreciation	(212,763)	(190,016)	(192,937)
Proportionate EBITDA of joint ventures	568,045	538,170	502,345
Adjusted EBITDA	(265,066)	(207,488)	(262,213)
Corporate expenses/elimination | Domestic market
Disclosure of operating segments [line items]
Net revenues	(2,718,623)	(2,491,006)	(2,079,534)
Corporate expenses/elimination | Foreign market
Disclosure of operating segments [line items]
Net revenues	R$ 1297256	R$ 885961	R$ 843340

26. SEGMENT INFORMATION (Deta_2

26. SEGMENT INFORMATION (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Information Details 1Abstract
Net income / (loss) for the year	R$ 5200583	R$ 111229	R$ 853058
Result from discontinued operations with the following value 9,561	0	0	9,561
Depreciation / amortization / depletion (note 23)	1,175,107	1,408,765	1,278,816
Income tax and social contribution (note 15)	250,334	409,109	266,546
Financial income / (expenses) (note 25)	1,495,643	2,463,627	2,522,427
EBITDA	8,121,667	4,392,730	3,224,292
Other operating (income) / expenses (note 24)	(2,705,337)	(177,342)	413,221
Equity in results of affiliated companies	(135,706)	(109,111)	(64,918)
Proportionate EBITDA of joint ventures	568,045	538,170	502,345
Adjusted EBITDA (*)	R$ 5848669	R$ 4644447	R$ 4074940

27. EMPLOYEE BENEFITS (Details)

27. EMPLOYEE BENEFITS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value of plan assets [line items]
Actuarial assets	R$ 99894	R$ 111281
Actuarial liabilities	905,119	908,721
Pension plan benefits
Disclosure of fair value of plan assets [line items]
Actuarial assets	(99,894)	(111,281)
Actuarial liabilities	7,982	41,937
Post-employment healthcare benefits
Disclosure of fair value of plan assets [line items]
Actuarial assets	0	0
Actuarial liabilities	R$ 897137	R$ 866784	R$ 691262

27. EMPLOYEE BENEFITS (Details

27. EMPLOYEE BENEFITS (Details 1) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Benefits Details 1Abstract
Present value of defined benefit obligation	R$ 3087433	R$ 3077849	R$ 2872442
Fair value of plan assets	(3,403,906)	(3,305,356)	R$ 3193493
Deficit (Surplus)	(316,473)	(227,507)
Restriction to actuarial assets due to recovery limitation	224,561	158,163
Liabilities (Assets), net	(91,912)	(69,344)
Liabilities	7,982	41,937
Assets	(99,894)	(111,281)
(Assets) liabilities recognized in the balance sheet	R$ 91912	R$ 69344

27. EMPLOYEE BENEFITS (Detail_2

27. EMPLOYEE BENEFITS (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 2Abstract
Present value of defined benefit obligation, beginning	R$ 3077849	R$ 2872442
Cost of service	1,169	1,285
Interest cost	304,132	322,359
Benefits paid	(280,493)	(284,777)
Actuarial loss/(gain)	(15,224)	166,540
Present value of defined benefit obligation, ending	R$ 3087433	R$ 3077849

27. EMPLOYEE BENEFITS (Detail_3

27. EMPLOYEE BENEFITS (Details 3) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 3Abstract
Fair value of plan assets, beginning	R$ 3305356	R$ 3193493
Interest income	(327,830)	(360,013)
Benefits paid	280,493	284,777
Expected return on plan assets (less interest income)	(51,213)	(36,627)
Fair value of plan assets, ending	R$ 3403906	R$ 3305356

27. EMPLOYEE BENEFITS (Detail_4

27. EMPLOYEE BENEFITS (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 4Abstract
Cost of current service	R$ 1169	R$ 1285
Interest cost	304,132	322,359
Expected return on plan assets	(327,830)	(360,013)
Interest on the asset ceiling effect	16,340	26,843
Total	(6,189)	(9,526)
Total unrecognized costs / (income) (*)	0	6
Total costs / (income) recognized in the income statement	(6,189)	(9,532)
Total costs / (income), net (*)	R$ 6189	R$ 9526

27. EMPLOYEE BENEFITS (Detail_5

27. EMPLOYEE BENEFITS (Details 5) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 5Abstract
Actuarial losses and (gains)	R$ 15224	R$ 166540
Return on plan assets (less interest income)	(51,213)	(36,627)
Total	(66,437)	129,913
Actuarial losses and (gains) recognized in other comprehensive income	(16,379)	32,037
Unrecognized actuarial (gains)	0	(6)
Total	R$ 66437	R$ 129913

27. EMPLOYEE BENEFITS (Detail_6

27. EMPLOYEE BENEFITS (Details 6) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 6Abstract
Loss due to change in demographic assumptions	R$ 139813
Loss due to change in financial assumptions	46,917
Loss due to experience adjustments	77,672
Return on plan assets (less interest income)	(51,213)	R$ 36627
Actuarial losses and (gains)	R$ 66437	R$ 129913

27. EMPLOYEE BENEFITS (Detail_7

27. EMPLOYEE BENEFITS (Details 7)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits Details 7Abstract
Actuarial financing method	Projected unit credit	Projected unit credit
Functional currency	Real (R$)	Real (R$)
Recognition of plan assets	Fair value	Fair value
Nominal discount rate	Millennium Plan: 9.69% Plan 35%: 9.60% Supplementation: 9.59%	Milenium Plan: 10.42% Plan 35%: 10.30% and Supplementation: 10.32%
Inflation rate	4.75%	5.00%
Nominal salary increase rate	5.80%	6.05%
Nominal benefit increase rate	4.75%	5.00%
Rate of return on investments	Millennium Plan: 9.69% Plan 35%: 9.60% Supplementation: 9.59%	Milenium Plan: 10.42% Plan 35%: 10.30% and Supplementation: 10.32%
General mortality table	Millennium Plan: AT-2000 smoothed down by 10% segregated by gender. Plans 35%: AT-2000 Male aggravated by 15%. Supplementation: AT-2000 aggravated by 10% segregated by gender.	35% and Average Salary Supplementation Plans : AT 2000 segregated by gender (10% smoothed)
Disability table	35% Plan and Supplementation: Light Medium. Millenium Plan: Prudential (Ferr. Retirement)	Plan 35% and Supplementation: Light Média Millênnium Plan: Prudential ( retirement)
Disability mortality table	Winklevoss - 1%	Winklevoss - 1%
Turnover table	Millenium plan 5% per annum, zero for plans 35% and Supplementation.	Millennium plan 5% p.a., nil for DB plans
Retirement age	100% on the first date he/she becomes eligible for programmed retirement benefit under the plan	100% on the first date he/she becomes eligible for programmed retirement benefit under the plan
Household composition of active participants	95% will be married at the time of retirement, with the wife being 4 years younger than the husband	95% will be married at the time of retirement, with the wife being 4 years younger than the husband

27. EMPLOYEE BENEFITS (Detail_8

27. EMPLOYEE BENEFITS (Details 8)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Plan covering 35% of the average salary | Male
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	18	21
Average life expectancy in years of employees who are 40 (in years)	40	43
Plan covering 35% of the average salary | Female
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	18	23
Average life expectancy in years of employees who are 40 (in years)	40	47
Average salary supplementation plan | Male
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	18.74	20.45
Average life expectancy in years of employees who are 40 (in years)	40.6	42.69
Average salary supplementation plan | Female
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	22.23	23.02
Average life expectancy in years of employees who are 40 (in years)	45.37	46.29
Milenio Plan | Male
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	21	21
Average life expectancy in years of employees who are 40 (in years)	43	43
Milenio Plan | Female
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	23	23
Average life expectancy in years of employees who are 40 (in years)	47	47

27. EMPLOYEE BENEFITS (Detail_9

27. EMPLOYEE BENEFITS (Details 9) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Allocation of plan assets	R$ 3403906	R$ 3305356	R$ 3193493
Allocation of plan assets percent	100.00%	100.00%
Variable income
Disclosure of defined benefit plans [line items]
Allocation of plan assets	R$ 141705	R$ 50966
Allocation of plan assets percent	4.16%	1.54%
Fixed income
Disclosure of defined benefit plans [line items]
Allocation of plan assets	R$ 3050099	R$ 3085783
Allocation of plan assets percent	89.61%	93.36%
Real estate
Disclosure of defined benefit plans [line items]
Allocation of plan assets	R$ 52091	R$ 44083
Allocation of plan assets percent	1.53%	1.33%
Others
Disclosure of defined benefit plans [line items]
Allocation of plan assets	R$ 160011	R$ 124524
Allocation of plan assets percent	4.70%	3.77%

27. EMPLOYEE BENEFITS (Detai_10

27. EMPLOYEE BENEFITS (Details 10) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Effect on present value of obligations	R$ 51213	R$ 36627
Plan covering 35% of the average salary | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 409
Effect on present value of obligations	R$ 13281
Plan covering 35% of the average salary | Salary growth
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Plan covering 35% of the average salary | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 1439
Effect on present value of obligations	R$ 14685
Plan covering 35% of the average salary | Benefit adjustment
Disclosure of defined benefit plans [line items]
Sensitivity level	1.00%
Effect on current service cost and on interest on actuarial obligations	R$ 1052
Effect on present value of obligations	R$ 10680
Plan covering 35% of the average salary | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 458
Effect on present value of obligations	R$ 15342
Plan covering 35% of the average salary | Salary growth
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Plan covering 35% of the average salary | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 1350
Effect on present value of obligations	R$ 13778
Plan covering 35% of the average salary | Benefit adjustment
Disclosure of defined benefit plans [line items]
Sensitivity level	(1.00%)
Effect on current service cost and on interest on actuarial obligations	R$ 1054
Effect on present value of obligations	R$ 10706
Average salary supplementation plan | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 1650
Effect on present value of obligations	R$ 70755
Average salary supplementation plan | Salary growth
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Average salary supplementation plan | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 7578
Effect on present value of obligations	R$ 79305
Average salary supplementation plan | Benefit adjustment
Disclosure of defined benefit plans [line items]
Sensitivity level	1.00%
Effect on current service cost and on interest on actuarial obligations	R$ 4877
Effect on present value of obligations	R$ 50807
Average salary supplementation plan | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 1897
Effect on present value of obligations	R$ 76222
Average salary supplementation plan | Salary growth
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Average salary supplementation plan | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 7079
Effect on present value of obligations	R$ 74101
Average salary supplementation plan | Benefit adjustment
Disclosure of defined benefit plans [line items]
Sensitivity level	(1.00%)
Effect on current service cost and on interest on actuarial obligations	R$ 4845
Effect on present value of obligations	R$ 50468
Mixed supplementary benefit plan (Milenio Plan) | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 502
Effect on present value of obligations	R$ 50666
Mixed supplementary benefit plan (Milenio Plan) | Salary growth
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 252
Effect on present value of obligations	R$ 2028
Mixed supplementary benefit plan (Milenio Plan) | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 5720
Effect on present value of obligations	R$ 57166
Mixed supplementary benefit plan (Milenio Plan) | Benefit adjustment
Disclosure of defined benefit plans [line items]
Sensitivity level	1.00%
Effect on current service cost and on interest on actuarial obligations	R$ 1120
Effect on present value of obligations	R$ 12179
Mixed supplementary benefit plan (Milenio Plan) | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 316
Effect on present value of obligations	R$ 54396
Mixed supplementary benefit plan (Milenio Plan) | Salary growth
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 223
Effect on present value of obligations	R$ 1792
Mixed supplementary benefit plan (Milenio Plan) | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 5232
Effect on present value of obligations	R$ 52366
Mixed supplementary benefit plan (Milenio Plan) | Benefit adjustment
Disclosure of defined benefit plans [line items]
Sensitivity level	(1.00%)
Effect on current service cost and on interest on actuarial obligations	R$ 1128
Effect on present value of obligations	R$ 12165

27. EMPLOYEE BENEFITS (Detai_11

27. EMPLOYEE BENEFITS (Details 11) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	R$ 2740285
Year 1
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	244,606
Year 2
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	252,778
Year 3
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	269,332
Year 4
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	265,261
Year 5
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	271,570
Next 5 years
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	R$ 1436738

27. EMPLOYEE BENEFITS (Detai_12

27. EMPLOYEE BENEFITS (Details 12) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]
Present value of obligations	R$ 3087433	R$ 3077849	R$ 2872442
Actuarial liabilities	905,119	908,721
Post-employment healthcare benefits
Disclosure of net defined benefit liability (asset) [line items]
Present value of obligations	897,137	866,784
Actuarial liabilities	R$ 897137	R$ 866784	R$ 691262

27. EMPLOYEE BENEFITS (Detai_13

27. EMPLOYEE BENEFITS (Details 13) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]
Actuarial liability at the beginning of the year	R$ 908721
Actuarial liability at the end of the year	905,119	R$ 908721
Post-employment healthcare benefits
Disclosure of net defined benefit liability (asset) [line items]
Actuarial liability at the beginning of the year	866,784	691,262
Expenses recognized in income for the year	85,748	77,269
Sponsor's contributions transferred in prior year	(71,632)	(72,192)
Recognition of actuarial loss/ (gain)	16,237	170,445
Actuarial liability at the end of the year	R$ 897137	R$ 866784

27. EMPLOYEE BENEFITS (Detai_14

27. EMPLOYEE BENEFITS (Details 14) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Actuarial gain (loss) on obligation	R$ 15224	R$ 166540
Gain (loss) recognized in shareholders' equity	(66,437)	129,913
Post-employment healthcare benefits
Disclosure of defined benefit plans [line items]
Actuarial gain (loss) on obligation	16,237	170,445	R$ 210257
Gain (loss) recognized in shareholders' equity	R$ 16237	R$ 170445	R$ 210257

27. EMPLOYEE BENEFITS (Detai_15

27. EMPLOYEE BENEFITS (Details 15) - Post-employment healthcare benefits	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Male
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	19.55	19.55
Average life expectancy in years of employees who are 40 (in years)	41.59	41.59
Female
Disclosure of defined benefit plans [line items]
Average life expectancy of employees (in years)	22.17	22.17
Average life expectancy in years of employees who are 40 (in years)	45.30	45.30

27. EMPLOYEE BENEFITS (Detai_16

27. EMPLOYEE BENEFITS (Details 16)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
General mortality table	Millennium Plan: AT-2000 smoothed down by 10% segregated by gender. Plans 35%: AT-2000 Male aggravated by 15%. Supplementation: AT-2000 aggravated by 10% segregated by gender.	35% and Average Salary Supplementation Plans : AT 2000 segregated by gender (10% smoothed)
Disability mortality table	Winklevoss - 1%	Winklevoss - 1%
Inflation	4.75%	5.00%
Post-employment healthcare benefits
Disclosure of defined benefit plans [line items]
General mortality table	AT 2000 segregated by gender	AT 2000 segregated by gender
Disability mortality table	Winklevoss with death probabilities reduced by 1% in all ages	Winklevoss with death probabilities reduced by 1% in all ages
Actuarial nominal discount rate	9.62%	10.34%
Inflation	4.75%	5.00%
Real increase in medical costs based on age (Aging Factor)	0.5% - 3.00%real a.a	0.5% - 3.00%real a.a
Nominal increase medical costs growth rate	8.15%	8.41%
Average medical cost	1054.65	1,001.69

27. EMPLOYEE BENEFITS (Detai_17

27. EMPLOYEE BENEFITS (Details 17) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Effect on present value of obligations	R$ 51213	R$ 36627
Post-employment healthcare benefits | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	0.50%
Effect on current service cost and on interest on actuarial obligations	R$ 909
Effect on present value of obligations	R$ 35530
Post-employment healthcare benefits | Medical inflation
Disclosure of defined benefit plans [line items]
Sensitivity level	1.00%
Effect on current service cost and on interest on actuarial obligations	R$ 8091
Effect on present value of obligations	R$ 84560
Post-employment healthcare benefits | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	1.00%
Effect on current service cost and on interest on actuarial obligations	R$ 2161
Effect on present value of obligations	R$ 22582
Post-employment healthcare benefits | Discount rate
Disclosure of defined benefit plans [line items]
Sensitivity level	(0.50%)
Effect on current service cost and on interest on actuarial obligations	R$ 992
Effect on present value of obligations	R$ 38727
Post-employment healthcare benefits | Medical inflation
Disclosure of defined benefit plans [line items]
Sensitivity level	(1.00%)
Effect on current service cost and on interest on actuarial obligations	R$ 6925
Effect on present value of obligations	R$ 72369
Post-employment healthcare benefits | Mortality table
Disclosure of defined benefit plans [line items]
Sensitivity level	(1.00%)
Effect on current service cost and on interest on actuarial obligations	R$ 2148
Effect on present value of obligations	R$ 22451

27. EMPLOYEE BENEFITS (Detai_18

27. EMPLOYEE BENEFITS (Details 18) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	R$ 2740285
Post-employment healthcare benefits
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	865,496
Post-employment healthcare benefits | Year 1
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	78,100
Post-employment healthcare benefits | Year 2
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	80,787
Post-employment healthcare benefits | Year 3
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	83,232
Post-employment healthcare benefits | Year 4
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	85,386
Post-employment healthcare benefits | Year 5
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	87,224
Post-employment healthcare benefits | Next 5 years
Disclosure of defined benefit plans [line items]
Benefit payments of the defined benefit plans	R$ 450767

27. EMPLOYEE BENEFITS (Detai_19

27. EMPLOYEE BENEFITS (Details Narrative) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)Participants	Dec. 31, 2017BRL (R$)Participants	Dec. 31, 2016BRL (R$)Participants
Disclosure of defined benefit plans [line items]
Total participants	34,985	35,176	34,051
Pension plan expense | R$	R$ 40199	R$ 41544	R$ 35798
Active contributors
Disclosure of defined benefit plans [line items]
Total participants	20,872	20,734
Retired employees
Disclosure of defined benefit plans [line items]
Total participants	13,454	13,587
Related beneficiaries
Disclosure of defined benefit plans [line items]
Total participants	659	855

28. COMMITMENTS (Details)

28. COMMITMENTS (Details) R$ in Thousands	Dec. 31, 2018BRL (R$)
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	R$ 7132947
2017
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	1,582,099
2018
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	1,096,086
2019
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	1,493,517
2020
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	1,013,499
2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	849,905
After 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	3,776,026
Transportation of iron ore, coal, coke, steel products, cement and mining products
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	6,579,471
Transportation of iron ore, coal, coke, steel products, cement and mining products | 2017
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	957,373
Transportation of iron ore, coal, coke, steel products, cement and mining products | 2018
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	406,920
Transportation of iron ore, coal, coke, steel products, cement and mining products | 2019
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	1,024,674
Transportation of iron ore, coal, coke, steel products, cement and mining products | 2020
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	962,399
Transportation of iron ore, coal, coke, steel products, cement and mining products | 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	831,166
Transportation of iron ore, coal, coke, steel products, cement and mining products | After 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	3,761,232
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	503,000
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets | 2017
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	563,743
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets | 2018
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	658,166
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets | 2019
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	453,801
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets | 2020
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	40,780
Supply of power, natural gas, oxygen, nitrogen, argon and iron ore pellets | 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	8,419
Processing of furnace sludge and slag generated during pig iron and steel production
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	30,064
Processing of furnace sludge and slag generated during pig iron and steel production | 2017
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	8,880
Processing of furnace sludge and slag generated during pig iron and steel production | 2018
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	9,467
Processing of furnace sludge and slag generated during pig iron and steel production | 2019
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	7,074
Processing of furnace sludge and slag generated during pig iron and steel production | 2020
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	7,074
Processing of furnace sludge and slag generated during pig iron and steel production | 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	7,074
Processing of furnace sludge and slag generated during pig iron and steel production | After 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	8,842
Manufacturing, repair, recovery and production of ingot casting machine units
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	20,412
Manufacturing, repair, recovery and production of ingot casting machine units | 2017
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	52,103
Manufacturing, repair, recovery and production of ingot casting machine units | 2018
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	21,533
Manufacturing, repair, recovery and production of ingot casting machine units | 2019
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	7,968
Manufacturing, repair, recovery and production of ingot casting machine units | 2020
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	3,246
Manufacturing, repair, recovery and production of ingot casting machine units | 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	3,246
Manufacturing, repair, recovery and production of ingot casting machine units | After 2021
Disclosure of detailed information about borrowings [line items]
Take-or-pay contracts	R$ 5952

28. COMMITMENTS (Details 1)

28. COMMITMENTS (Details 1) R$ in Thousands	12 Months Ended
	Dec. 31, 2018BRL (R$)
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	R$ 4217333
2019
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	176,196
2020
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	177,593
2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	179,055
After 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	R$ 3684489
FTL
Disclosure of detailed information about borrowings [line items]
Type of service	30 - year concession granted on December 31,1997, renewable for another 30 years, to develop public service and operating the raiw ayrailway system in northeastern Brazil.The northeastern raiway system covers 4.238 Kilometers of railway network and operates in Maranhão, Piauí, Ceará, Paraíba, Pernambuco, Alagoas and Rio Grande do Norte.
Minimum future payments related to government concessions	R$ 79083
FTL | 2019
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	9,396
FTL | 2020
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	9,396
FTL | 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	9,396
FTL | After 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	R$ 50895
Tecar
Disclosure of detailed information about borrowings [line items]
Type of service	Concession to operate the TECAR a solid bulk terminal, one of the four terminals that make up the Port of Itaguai, located in Rio de Janeiro. The concession was renewed and the agreement expires in 2047.
Minimum future payments related to government concessions	R$ 3857604
Tecar | 2019
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	133,021
Tecar | 2020
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	133,021
Tecar | 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	133,021
Tecar | After 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	R$ 3458541
Tecon
Disclosure of detailed information about borrowings [line items]
Type of service	25-year concession started in July 2001. On May 10, 2017, was approved the Decree nº 9,048, which changes de concession extension period for port operations. It was established that the requested extension period, added to the initial period, cannot exceed 70 years
Minimum future payments related to government concessions	R$ 280646
Tecon | 2019
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	33,779
Tecon | 2020
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	35,176
Tecon | 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	36,638
Tecon | After 2021
Disclosure of detailed information about borrowings [line items]
Minimum future payments related to government concessions	R$ 175053

30. ADDITIONAL INFORMATION TO_3

30. ADDITIONAL INFORMATION TO CASH FLOWS (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Additional Information To Cash Flows Details Abstract
Income tax and social contribution paid	R$ 336962	R$ 268847	R$ 456227
Addition to PP&E with interest capitalization	71,611	91,957	215,794
Acquisition of fixed assets through loans	10,792	4,265	7,437
Non-monetary transaction with joint venture	0	20,264
Total additional information to cash flows	R$ 419365	R$ 385333	R$ 679458