<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Union
Carbide Corporation's Form 10-Q/A for the quarter ended March 31, 1999, and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<RESTATED>
<CIK> 0000100790
<NAME> UNION CARBIDE CORPORATION
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-31-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                              33
<SECURITIES>                                         0
<RECEIVABLES>                                      997
<ALLOWANCES>                                         0
<INVENTORY>                                        571
<CURRENT-ASSETS>                                  1874
<PP&E>                                            8509
<DEPRECIATION>                                    4290
<TOTAL-ASSETS>                                    7292
<CURRENT-LIABILITIES>                             1434
<BONDS>                                           1796
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           156
<OTHER-SE>                                        2271
<TOTAL-LIABILITY-AND-EQUITY>                      7292
<SALES>                                           1402
<TOTAL-REVENUES>                                  1402
<CGS>                                             1032
<TOTAL-COSTS>                                     1032
<OTHER-EXPENSES>                                   141<F1>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  31
<INCOME-PRETAX>                                    148
<INCOME-TAX>                                        38
<INCOME-CONTINUING>                                 77
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                           20
<NET-INCOME>                                        57
<EPS-BASIC>                                       0.43
<EPS-DILUTED>                                     0.42
<FN>
<F1>Other expenses are equal to research and development of 37 and depreciation and
amortization of 104.
</FN>