UNITED STATES STEEL CORPORATION,
                                     Issuer



                                       and



                          THE BANK OF NEW YORK MELLON,
                                     Trustee



                          FOURTH SUPPLEMENTAL INDENTURE

                           DATED AS OF MARCH 19, 2010

                                  TO INDENTURE

                            DATED AS OF MAY 21, 2007



                                   Relating To



                 $600,000,000 7-3/8% Senior Notes due April 1, 2020


                          FOURTH SUPPLEMENTAL INDENTURE

     FOURTH   SUPPLEMENTAL  INDENTURE,  dated  as  of  March   19,   2010
(the "Supplemental  Indenture"),  to  the Indenture (defined  below)  between
United States  Steel Corporation (the "Company"), a Delaware corporation, and
The  Bank of New York Mellon, a New York banking corporation, as Trustee (the
"Trustee").

                                    RECITALS

     WHEREAS,  the Company has heretofore executed and delivered to the
Trustee an Indenture, dated as of May 21, 2007 (the "Base Indenture"),
providing for the issuance  from  time  to time of its notes and other
evidences  of  senior  debt securities, to be issued in one or more series as
therein provided;

     WHEREAS,  pursuant to the terms of the Base Indenture, the Company
desires to  provide for the establishment of a new series of its Securities to
be  known as  its 7-3/8% Senior Notes due 2020 (the "Notes"), the form and
substance of  such Notes  and  the  terms, provisions and conditions thereof
to  be  set  forth  as provided  in  the Base Indenture and this Supplemental
Indenture (together,  the "Indenture"); and

     WHEREAS,  the  Company has requested that the Trustee execute  and
deliver this  Supplemental  Indenture,  and  all requirements  necessary  to
make  this Supplemental Indenture a valid instrument in accordance with its
terms,  and  to make the Notes, when executed by the Company and authenticated
and delivered  by the  Trustee, the valid and legally binding obligations of
the Company, and  all acts and things necessary have been done and performed
to make this Supplemental Indenture  enforceable  in  accordance with its
terms,  and  the  execution  and delivery  of  this  Supplemental  Indenture
has  been  duly  authorized  in  all respects.

                                   WITNESSETH:

     NOW,  THEREFORE, for and in consideration of the premises contained
herein, each  party  agrees for the benefit of each other party and for  the
equal  and ratable benefit of the Holders of the Notes, as follows:

                                   ARTICLE ONE

                                   DEFINITIONS

     SECTION 1.01.    Capitalized terms used but not defined in this
Supplemental Indenture shall have the meanings ascribed to them in the Base
Indenture.

     Section 1.02.    References in this Supplemental Indenture to article and
section numbers shall be deemed to be references to article and section numbers
of this Supplemental Indenture unless otherwise specified.

     Section 1.03.    For purposes of this Supplemental Indenture, the
following terms have the meanings ascribed to them as follows:

     "Attributable Debt" means, with respect to any sale and leaseback
transaction, at the time of determination, the lesser of (1) the sale price of
the property so leased multiplied by a fraction the numerator of which is the
remaining portion of the base term of the lease included in such transaction
and the denominator of which is the base term of such lease, and (2) the total
obligation (discounted to the present value at the implicit interest factor,
determined in accordance with GAAP, included in the rental payments) of the
lessee for rental payments (other than amounts required to be paid on account
of property taxes as well as maintenance, repairs, insurance, water rates and
other items which do not constitute payments for property rights) during the
remaining portion of the base term of the lease included in such transaction.

     "Base Indenture" has the meaning provided in the recitals.

     "Change of Control" has the meaning provided in Section 4.02.

     "Change  of  Control Repurchase Event" has the meaning provided in
Section 4.02.

     "Comparable Treasury Issue" has the meaning provided in Section 4.01.

     "Comparable Treasury Price" has the meaning provided in Section 4.01.

     "Consolidated  Net Tangible Assets" means, as of the time of
determination, the  aggregate  amount  of  the assets of the Company  and  the
assets  of  its consolidated  Subsidiaries  after  deducting  (1)  all
goodwill,  trade  names, trademarks,  service marks, patents, unamortized debt
discount and  expense  and other  intangible  assets and (2) all current
liabilities, as reflected  on  the most  recent  consolidated balance sheet
prepared by the Company  in  accordance with  GAAP  contained in an annual
report on Form 10-K or a quarterly report  on Form 10-Q timely filed or any
amendment thereto (and not subsequently disclaimed as  not  being  reliable by
the Company) pursuant to the  Exchange  Act  by  the Company  prior  to  the
time as of which "Consolidated Net Tangible  Assets"  is being determined.

     "Currency  Agreement"  means in respect of a Person  any  foreign
exchange contract, currency swap agreement or other similar agreement designed
to protect such Person against fluctuations in currency values.

     "Depositary" has the meaning provided in Section 2.03.

     "Guarantee"  means any obligation, contingent or otherwise, of  any
Person directly or indirectly guaranteeing any Indebtedness of any other Person
and any obligation, direct or indirect, contingent or otherwise, of such
Person  (1)  to purchase or pay (or advance or supply funds for the purchase
or payment of) such Indebtedness  of  such  other Person (whether arising by
virtue  of   partnership arrangements,  or  by  agreement  to  keep  well,  to
purchase  assets,  goods, securities  or  services,  to  take or pay or to
maintain financial  statement conditions  or  otherwise) or (2) entered into
for purposes of assuring  in  any other  manner  the  obligee of such
Indebtedness of the payment  thereof  or  to protect  such  obligee against
loss in respect thereof (in whole  or  in  part); provided, however, that the
term "Guarantee" shall not include endorsements  for collection  or deposit in
the ordinary course of business. The term "Guarantee," when used as a verb,
shall have a correlative meaning.

     "Hedging  Obligation" means the obligations of any Person pursuant  to
any Interest Rate Agreement or Currency Agreement.

     "Incur"  means  issue,  assume, Guarantee or otherwise  become  liable
for Indebtedness.

     "Indebtedness"  means,  with  respect to any Person,  obligations  of
such Person  for  borrowed  money  (including without  limitation,
Indebtedness  for borrowed money evidenced by notes, bonds, debentures or
similar instruments).

     "Independent Investment Banker" has the meaning provided in Section 4.01.

     "Indenture" has the meaning provided in the recitals.

     "Interest Payment Date" has the meaning provided in Section 2.04.

     "Interest Rate Agreement" means, in respect of a Person, any interest
rate swap  agreement,  interest rate cap agreement or other  financial
agreement  or arrangement  designed  to protect such Person against
fluctuations  in  interest rates.

     "Investment Grade" has the meaning provided in Section 4.02.

     "Liens" has the meaning provided in Section 3.01.

     "Moody's" has the meaning provided in Section 4.02.

     "Notes" has the meaning provided in the recitals.

     "Primary Treasury Dealer" has the meaning provided in Section 4.01.

     "Principal  Property" means any domestic blast furnace or  steel
producing facility, or casters that are part of a plant that includes such a
facility,  in each case located in the United States, having a net book value
in excess of  1% of Consolidated Net Tangible Assets at the time of
determination.

     "Rating Agency" has the meaning provided in Section 4.02.

     "Rating Category" has the meaning provided in Section 4.02.

     "Rating Date" has the meaning provided in Section 4.02.

     "Ratings Event" has the meaning provided in Section 4.02.

     "Reference Treasury Dealer" has the meaning provided in Section 4.01.

     "Reference Treasury Dealer Quotations" has the meaning provided in
Section 4.01.

     "Refinance"  means,  in respect of any Indebtedness, to refinance,
extend, renew,  refund,  repay, prepay, redeem, defease or retire,  or  to
issue  other Indebtedness  in  exchange or replacement for, such Indebtedness.
"Refinanced" and "Refinancing" shall have correlative meanings.

     "S&P" has the meaning provided in Section 4.02.

     "Subsidiary" means, with respect to any Person (the "Parent") at any
date, any  corporation, limited liability company, partnership, association
or  other entity of which a majority of the shares or securities or other
interests having ordinary  voting power for the election of directors or
another  governing  body (other  than  securities or interests having such
power only by  reason  of  the happening  of  a  contingency) are at the time
beneficially  owned  directly  or indirectly through one or more
intermediaries, or both, by the Parent.

     "Supplemental Indenture" has the meaning provided in the preamble.

     "Treasury Yield" has the meaning provided in Section 4.01.

     "Trustee" has the meaning provided in the preamble.

     "Voting Stock" has the meaning provided in Section 4.02.

                                   ARTICLE TWO

                    GENERAL TERMS AND CONDITIONS OF THE NOTES

     SECTION 2.01.    Designation and Principal Amount.

     The Notes are hereby authorized and are designated the 7?% Senior Notes
due 2020,  unlimited in aggregate principal amount.  The Notes issued  on  the
date hereof  pursuant  to  the  terms of this Indenture  shall  be  in  an
aggregate principal amount of $600,000,000, which amount shall be set forth in
the written order  of  the Company for the authentication and delivery of the
Notes pursuant to Section 3.03 of the Base Indenture.  In addition, the Company
may issue, from time  to  time  in accordance with the provisions of this
Indenture,  additional Notes  having  the  same terms and conditions as the
Notes issued  on  the  date hereof in all respects (except for the payment of
interest accruing prior to the issue  date  of such additional Notes), so that
such additional Notes  shall  be consolidated and form a single series with the
Notes issued on the  date  hereof and shall be governed by the terms of this
Indenture.

     Section 2.02.    Maturity.

     The principal amount of the Notes shall be payable on April 1, 2020.

     Section 2.03.    Form and Payment.

     The  Notes  shall be issued as global notes, in fully registered
book-entry form without coupons in denominations of $1,000 and integral
multiples thereof.

     Principal,  premium, if any, and/or interest, if any, on the  global
notes representing  the  Notes  shall  be made to The Depository  Trust
Company  (the "Depositary").

     The  global  notes representing the Notes shall be deposited  with,  or
on behalf  of, the Depositary and shall be registered in the name of the
Depositary or  a nominee of the Depositary.  No global note may be transferred
except as  a whole by a nominee of the Depositary to the Depositary or to
another nominee  of the  Depositary,  or  by the Depositary or such nominee to
a  successor  of  the Depositary or a nominee of such successor.

     The  Bank of New York Mellon shall act as Paying Agent for the Notes.
The Company  may choose to pay interest by mailing checks or making wire
transfers. All  money paid by the Company to any Paying Agent that remains
unclaimed at the end  of  two  years after the amount is due to Holders shall
be  repaid  to  the Company.  After such two-year period, Holders may look only
to the  Company  for payment  and  not  to the Trustee, any other Paying Agent
or anyone  else.   The Company  may  also  arrange for additional payment
offices, and  may  cancel  or change these offices, including any use of the
Trustee's corporate trust office. The  Company shall notify the Holders of
changes in the identity of  the  Paying Agent.

     Section 2.04.    Interest.

     Interest  on  the  Notes  shall accrue at the rate  of  7.375%  per
annum. Interest  on  the  Notes shall accrue from March 19, 2010  or  the
most  recent interest  payment date on which interest was paid.  Interest on
the Notes  shall be  payable  semiannually  in arrears on April 1 and October
1,  commencing  on October 1, 2010 (each an "Interest Payment Date"), to the
Holders in whose names the  Notes are registered at the close of business on
the March 15 and September 15  immediately  preceding such Interest Payment
Date.  Interest  on  the  Notes shall  be  computed on the basis of a 360-day
year comprised  of  twelve  30-day months.

                                  ARTICLE THREE

                              ADDITIONAL COVENANTS

     SECTION 3.01.    Limitation on Liens.

     The  Company  shall not Incur, and shall not permit any of its
Subsidiaries to  Incur,  any Indebtedness for borrowed money secured by a
mortgage,  security interest,  pledge,  lien,  charge  or other similar
encumbrance  (collectively, "Liens")  upon  (a)  any  Principal Property of
the  Company  or  any  Principal Property of a Subsidiary or (b) any shares of
stock or other equity interests or Indebtedness  of  any  Subsidiary that owns
a Principal Property  (whether  such Principal Property, shares of stock or
other equity interests or Indebtedness is now  existing  or owned or hereafter
created or acquired), in each case,  unless prior  to  or at the same time,
the Notes (together with, at the option  of  the Company, any other
Indebtedness of the Company or any Subsidiary ranking equally in  right of
payment with the Notes) are equally and ratably secured with or, at the option
of the Company, prior to, such Indebtedness.

     Any  Lien  created  for the benefit of Holders pursuant  to  the
preceding sentence  shall  provide by its terms that such Lien shall be
automatically  and unconditionally released and discharged upon the release
and discharge  of  such Lien.

     The  foregoing restriction does not apply, with respect to any  Person,
to any of the following:

     (i)  leases  to which such Person is a party, or deposits to secure
          public  or statutory obligations of such Person or deposits of cash
	  or United States government bonds to secure surety or appeal bonds to
	  which such Person  is  a  party, or deposits as security for
          contested  taxes  or import duties or for the payment of rent, in
          each case Incurred in the ordinary course of business;

     (ii) Liens imposed by law, such as carriers', warehousemen's and
	  mechanics' liens,  in each case for sums not yet overdue by more than
	  30 days  or being  contested  in  good faith by appropriate
          proceedings  or  other Liens  arising  out of judgments or awards
          against  such  Person  with respect  to which such Person shall then
          be proceeding with an  appeal or  other proceedings for review and
          Liens arising solely by virtue of any  statutory  or  common law
          provision relating to  banker's  Liens, rights  of  set-off  or
          similar rights and  remedies  as  to  deposit accounts   or  other
          funds  maintained  with  a  creditor  depository institution;
          provided, however, that (A) such deposit account is not a dedicated
          cash collateral account and is not subject to restrictions against
          access  by  the  Company in excess  of  those set  forth  by
          regulations  promulgated by the Federal Reserve  Board and  (B) such
          deposit  account is not intended by the Company to provide
          collateral to the Depositary;

     (iii)Liens  for property taxes not yet subject to penalties for  non-
          payment  or  which  are being contested in good faith  by
	  appropriate proceedings;

     (iv) minor survey exceptions, minor encumbrances, easements or
	  reservations of, or rights of others for, licenses, rights-of-way,
	  sewers, electric lines,  telegraph and telephone lines and other
	  similar  purposes,  or zoning  or other restrictions as to the use of
          real property or  Liens incidental  to the conduct of the business of
          such Person  or  to  the ownership of its properties which were not
          Incurred in connection with Indebtedness  and  which do not in the
          aggregate materially  adversely affect the value of said properties
          or materially impair their use  in the operation of the business of
          such Person;

     (v)  Liens  securing  Indebtedness Incurred to  finance  the
          construction, purchase  or  lease  of,  or repairs, improvements  or
          additions  to, property,  plant or equipment of such Person;
          provided, however,  that the Lien may not extend to any other
          property owned by such Person  at the  time the Lien is Incurred
          (other than assets and property affixed or appurtenant thereto), and
          the Indebtedness (other than any interest thereon)  secured by the
          Lien may not be Incurred more than  180  days after  the  later  of
          the  acquisition, completion  of  construction, repair, improvement,
          addition or commencement of full operation of the property subject to
          the Lien;

     (vi) Liens existing on the issue date of the Notes;

     (vii)Liens on property or shares of capital stock of another Person
          at the  time  such  other  Person becomes a Subsidiary  of  such
          Person; provided, however, that the Liens may not extend to any other
          property owned  by  such  Person  (other than assets and  property
          affixed  or appurtenant thereto);

    (viii)Liens  securing  industrial revenue or pollution  control  bonds
          issued for the benefit of the Company;

     (ix) Liens  on  property at the time such Person or any of its
          Subsidiaries acquires the property, including any acquisition by
          means of a  merger or  consolidation  with or into such Person or a
          Subsidiary  of  such Person; provided, however, that the Liens may
          not extend to any  other property owned by such Person (other than
          assets and property  affixed or appurtenant thereto);

     (x)  Liens  securing Indebtedness or other obligations of a  Subsidiary
          of such  Person owing to such Person or a wholly-owned Subsidiary of
          such Person;

     (xi) Liens  to  secure  any Refinancing (or successive Refinancings)  as
          a whole, or in part, of any Indebtedness secured by any Lien referred
          to in  the  foregoing clauses (v), (vi), (vii), (viii) or (ix);
          provided, however,  that: (a) such new Lien shall be limited to all
          or  part  of the  same  property  and  assets that secured or,  under
          the  written agreements pursuant to which the original Lien arose,
          could secure the original  Lien (plus improvements and accessions to,
          such property  or proceeds  or distributions thereof); and (b) the
          Indebtedness  secured by  such Lien at such time is not increased to
          any amount greater than the  sum  of  (x)  the outstanding principal
          amount  or,  if  greater, committed  amount of the Indebtedness under
          clauses (v), (vi),  (vii), (viii)  or  (ix) at the time the original
          Lien became a Lien permitted under  the Indenture and (y) an amount
          necessary to pay any  fees  and expenses,  including premiums,
          related to such Refinancing, refunding, extension, renewal or
          replacement; and

     (xii)Liens  on  assets  subject to a sale and  leaseback  transaction
          securing  Attributable  Debt  permitted to  be  Incurred  pursuant
          to Section 3.02.

     Notwithstanding   the   foregoing  restrictions,  the   Company   and  its
Subsidiaries  shall be permitted to Incur Indebtedness secured by a  Lien
which would  otherwise  be subject to the foregoing restrictions without
equally  and ratably  securing the Notes, if any, provided that, after giving
effect to  such Indebtedness,  the aggregate amount of all Indebtedness
secured  by  Liens  (not including Liens permitted under clauses (i) through
(xii) above), together  with all  Attributable Debt outstanding pursuant to
the second paragraph  of  Section 3.02, does not exceed 15% of the
Consolidated Net Tangible Assets of the Company calculated as of the date of
the creation or incurrence of the Lien. The Company and  its Subsidiaries also
may, without equally and ratably securing the  Notes, create  or  Incur  Liens
that extend, renew, substitute or  replace  (including successive extensions,
renewals, substitutions or replacements), in whole or  in part, any Lien
permitted pursuant to the preceding sentence.

     Section 3.02.    Limitation on Sale and Leaseback Transactions.

     The  Company shall not directly or indirectly, and shall not permit any
of its  Subsidiaries that own a Principal Property directly or indirectly to,
enter into  any  sale and leaseback transaction for the sale and leasing back
of  any Principal Property, whether now owned or hereafter acquired, unless:

     (i)  such transaction was entered into prior to the date of issuance of
the Notes (other than any additional Notes);

     (ii) such transaction was for the sale and leasing back to the Company
          or  one  of its Subsidiaries of any property by the Company or one
          of its Subsidiaries;

     (iii)such  transaction involves a lease for not more than three years
          (or  which may be terminated by the Company or its Subsidiaries
          within a period of not more than three years);

     (iv) the  Company would be entitled to Incur Indebtedness secured by a
          Lien with  respect  to such sale and leaseback transaction without
          equally and  ratably  securing  the Notes pursuant to the  last
          paragraph  of Section 3.01; or

     (v)  the  Company applies an amount equal to the net proceeds from the
          sale of  such property to the purchase of other property or assets
          used  or useful  in its business or to the retirement of long-term
          Indebtedness within  365 days before or after the effective date of
          any  such  sale and  leaseback  transaction; provided that, in lieu
          of  applying  such amount  to  the retirement of long-term
          Indebtedness, the Company  may deliver  Notes  of  both series to the
          Trustee for cancellation,  such Notes to be credited at the cost
          thereof to it.

     Notwithstanding the restrictions set forth in the preceding paragraph,
the Company  and  its Subsidiaries may enter into any sale and leaseback
transaction which  would otherwise be subject to the foregoing restrictions,
if after giving effect  thereto  the aggregate amount of all Attributable Debt
with  respect  to such  transactions, together with all Indebtedness
outstanding pursuant  to  the last  paragraph  of  Section 3.01, does not
exceed 15% of the  Consolidated  Net Tangible Assets of the Company calculated
as of the closing date of the sale and leaseback transaction.

                                  ARTICLE FOUR

                             REDEMPTION OF THE NOTES

     SECTION 4.01.    Optional Redemption.

     The  Company may redeem the Notes, at its option, at any time in whole,
or from time to time in part, at a price equal to the greater of:

     (i)  100% of the principal amount of the Notes to be redeemed; or

     (ii) the  sum of the present values of the remaining scheduled payments
          of principal  and  interest  on the Notes to be  redeemed,  exclusive
          of interest accrued to the date of redemption, discounted to the
          date of redemption  on a semiannual basis (assuming a 360-day year
          consisting of  twelve  30-day months) at the applicable Treasury
          Yield  plus  50 basis points, plus accrued interest to the date of
          redemption.

     The  Notes  called  for  redemption  become  due  on  the  date  fixed
for redemption. Notices of redemption shall be mailed by first-class mail  at
least 30  but not more than 60 days before the redemption date to each Holder
of Notes to be redeemed at its registered address. The notice of redemption
for the Notes shall  state  the  amount  to  be redeemed. On and after  the
redemption  date, interest shall cease to accrue on any Notes that are
redeemed. If less than  all of  the Notes are redeemed at any time, the Trustee
shall select Notes on a  pro rata basis or by any other method the Trustee
deems fair and appropriate.

     For  purposes  of determining the optional redemption price, the
following definitions are applicable:

     "Comparable  Treasury  Issue"  means the United  States  Treasury
security selected by an Independent Investment Banker as having a maturity
comparable  to the  remaining term of each series of the Notes that would be
utilized,  at  the time  of  selection  and  in accordance with customary
financial  practice,  in pricing  new issues of corporate debt securities of
comparable maturity  to  the remaining terms of the Notes.

     "Comparable Treasury Price" means, with respect to any redemption date,
the average of the Reference Treasury Dealer Quotations obtained by the Company
for that  redemption date, after excluding the highest and lowest of such
Reference Treasury Dealer Quotations, or, if the Company is unable to obtain at
least four such Reference Treasury Dealer Quotations, the average of all
Reference Treasury Dealer Quotations obtained by the Company.

     "Independent Investment Banker" means Banc of America Securities  LLC,
or, if such firm is unwilling or unable to select the applicable Comparable
Treasury Issue,  an  independent  investment  banking institution  of
national standing appointed by the Company.

     "Reference  Treasury Dealer" means Banc of America Securities LLC  and
its successors, and at least two other primary U.S. government securities
dealers in New  York  City (each, a "Primary Treasury Dealer") selected by the
Independent Investment  Banker; provided, however, that if any of the foregoing
shall  cease to  be  a Primary Treasury Dealer, the Company shall substitute
therefor another Primary Treasury Dealer.

     "Reference  Treasury  Dealer  Quotations"  means,  with  respect  to
each Reference Treasury Dealer and any redemption date for the Notes, an
average,  as determined  by  the  Company, of the bid and asked  prices  for
the  Comparable Treasury  Issue  for the Notes, expressed in each case as a
percentage  of  its principal  amount,  quoted in writing to the Trustee by
the  Reference  Treasury Dealer at 3:30 p.m., New York City time, on the
third business day preceding the redemption date.

     "Treasury  Yield" means, with respect to any redemption date applicable
to the  Notes,  the  rate  per annum equal to the semiannual  equivalent
yield to maturity,  computed  as  of  the third business day  immediately
preceding the redemption  date, of the Comparable Treasury Issue, assuming  a
price  for the Comparable  Treasury Issue, expressed as a percentage of its
principal amount, equal to the applicable Comparable Treasury Price for the
redemption date.

     Section 4.02.    Purchase of Notes Upon a Change of Control Repurchase
Event.

     If  a  Change  of Control Repurchase Event occurs, unless the  Company
has exercised  its right to redeem the Notes pursuant to the Indenture, the
Company shall be required to make an offer to each Holder of the Notes to
repurchase all or  any  part (in excess of $1,000 and in integral multiples of
$1,000) of  that Holder's  Notes  at a repurchase price in cash equal to 101%
of  the  aggregate principal  amount of the Notes repurchased plus any accrued
and unpaid  interest on  the  Notes repurchased to, but not including, the date
of repurchase. Within 30  days  following any Change of Control Repurchase
Event or, at the option  of the  Company,  prior to any Change of Control, but
after the public announcement of the Change of Control, the Company shall mail
a notice to each Holder, with a copy  to the Trustee, describing the
transaction or transactions that constitute or  may  constitute  the  Change of
Control Repurchase  Event  and  offering  to repurchase  the  Notes on the
payment date specified in the notice,  which  date shall  be  no earlier than
30 days and no later than 60 days from the date  such notice  is mailed. The
notice shall, if mailed prior to the date of consummation of  the Change of
Control, state that the offer to purchase is conditioned on  a Change  of
Control Repurchase Event occurring on or prior to the  payment  date specified
in the notice. The Company shall comply with the requirements of  Rule 14e-1
under  the  Exchange Act, and any other securities laws  and  regulations
thereunder to the extent those laws and regulations are applicable in
connection with  the  repurchase of the Notes as a result of a Change of
Control Repurchase Event.  To  the extent that the provisions of any securities
laws or regulations conflict  with the Change of Control Repurchase Event
provisions of  the  Notes, the Company shall comply with the applicable
securities laws and regulations and shall not be deemed to have breached its
obligations under the Change of Control Repurchase Event provisions of the
Notes by virtue of such conflict.

     On  the repurchase date following a Change of Control Repurchase Event,
the Company shall, to the extent lawful:

     (i)  accept  for  payment all the Notes or portions of the  Notes
          properly tendered pursuant to its offer;

     (ii) deposit  with the Paying Agent an amount equal to the  aggregate
          purchase price in respect of all of the Notes or portions of the
          Notes properly tendered; and

     (iii)deliver  or  cause  to  be delivered to the  Trustee  the  Notes
          properly accepted, together with an officer's certificate stating
          the aggregate principal amount of Notes being purchased by the
          Company.

     The  Paying  Agent  shall promptly mail to each Holder  of  Notes
properly tendered,  the  purchase  price for the Notes, and the  Trustee
shall  promptly authenticate and mail (or cause to be transferred by
book-entry) to each  Holder a  new  Note equal in principal amount to any
unpurchased portion of  any  Notes surrendered.

     The  Company shall not be required to make an offer to repurchase the
Notes upon  a Change of Control Repurchase Event if a third party makes such
an  offer in  the  manner, at the times and otherwise in compliance with the
requirements for  an  offer  made  by the Company and such third party
purchases  all  Notes properly tendered and not withdrawn under its offer.

     For   purposes  of  this  Section  4.02,  the  following  definitions
are applicable:

     "Change of Control" shall occur if: (1) any "person" (as such term is
used in  Sections  13(d) and 14(d) of the Exchange Act) is or becomes the
"beneficial owner" (as defined in Rules 13d-3 and 13d-5 under the Exchange Act,
except  that for  purposes of this clause (1) such person shall be deemed to
have "beneficial ownership" of all shares that any such person has the right to
acquire,  whether such  right  is  exercisable immediately or only after  the
passage  of  time), directly or indirectly, of more than 50% of the total
voting power of the Voting Stock  of  the  Company;  (2) individuals who on the
issue  date  of  the  Notes constituted  the  Board  of Directors (together
with  any  new  directors  whose election  by  such Board of Directors or whose
nomination for  election  by  the shareholders  of the Company was approved by
a vote of 66?% of the directors  of the Company then still in office who were
either directors on the issue date  of the  Notes  or  whose  election or
nomination for  election  was  previously  so approved)  cease  for  any
reason to constitute a  majority  of  the  Board  of Directors then in office;
(3) the adoption of a plan relating to the liquidation or dissolution of the
Company; or (4) the merger or consolidation of the Company with  or  into
another person or the merger of another person with or  into  the Company,  or
the  sale of all or substantially all the assets  of  the  Company (determined
on a consolidated basis) to another person, other than a  merger  or
consolidation  transaction in which Holders of securities that represented
100% of  the  Voting  Stock of the Company immediately prior to such
transaction  (or other securities into which such securities are converted as
part of such merger or  consolidation transaction) own directly or indirectly
at least a majority of the  voting power of the Voting Stock of the surviving
person in such merger  or consolidation   transaction   immediately  after
such   transaction   and   in substantially the same proportion as before the
transaction.

     "Change of Control Repurchase Event" means the occurrence of both a
Change of Control and a Ratings Event.

     "Investment  Grade"  means a rating of Baa3 or better by  Moody's  (or
its equivalent under any successor Rating Categories of Moody's), a rating  of
BBB- or  better  by  S&P (or its equivalent under any successor Rating
Categories  of S&P)  and  the  equivalent Investment Grade credit rating  from
any  additional Rating Agency or Rating Agencies selected by the Company.

     "Moody's" means Moody's Investors Service Inc.

     "Rating  Agency"  means (1) each of Moody's and S&P and (2)  if  either
of Moody's  or S&P ceases to rate the Notes or fails to make a rating of the
Notes publicly  available  for  reasons outside of  the  control  of  the
Company,  a "nationally  recognized statistical rating organization" within
the meaning  of Rule  15c3-l(e)(2)(vi)(F) under the Exchange Act, selected by
the Company  (as certified  by  a  resolution of the board of directors  of
the Company)  as  a replacement agency for Moody's or S&P, or both, as the
case may be.

     "Rating  Category"  means (1) with respect to S&P,  any  of  the
following categories:  BBB, BB, B, CCC, CC, C and D (or equivalent successor
categories); (2)  with respect to Moody's, any of the following categories:
Baa, Ba, B,  Caa, Ca,  C and D (or equivalent successor categories); and (3)
the equivalent of any such  category  of S&P or Moody's used by another Rating
Agency. In  determining whether  the  rating  of  the Notes has decreased by
one  or  more  gradations, gradations within Rating Categories (+ and - for
S&P; 1, 2 and 3 for Moody's; or the equivalent gradations for another Rating
Agency) shall be taken into account (e.g.,  with respect to S&P, a decline in
a rating from BB+ to BB,  as  well  as from BB- to B+, shall constitute a
decrease of one gradation).

     "Rating Date" means the date that is 60 days prior to the earlier of (1)
a Change  of Control or (2) public notice of the occurrence of a Change of
Control or of the intention by the Company to effect a Change of Control.

     "Ratings Event" means the occurrence of the events described in (a) or
(b) of  this  definition  on,  or  within 60 days after  the  earlier  of,
(1) the occurrence  of a Change of Control or (2) public notice of the
occurrence of  a Change  of Control or the intention by the Company to effect
a Change of Control (which  period  shall be extended so long as the rating of
the  Notes is  under publicly  announced consideration for a possible downgrade
by any of the  Rating Agencies): (a) if the Notes are rated by both Rating
Agencies on the Rating Date as  Investment Grade, the rating of the Notes shall
be reduced so that the Notes are  rated  below Investment Grade by both Rating
Agencies, or (b) if the  Notes are  rated below Investment Grade by at least
one Rating Agency, the ratings  of the  Notes  by both Rating Agencies shall
be decreased by one or more gradations (including  gradations  within Rating
Categories, as  well  as  between  Rating Categories)  and the Notes are then
rated below Investment Grade by both  Rating Agencies.   Notwithstanding the
foregoing, a Ratings Event otherwise arising  by virtue  of a particular
reduction in rating shall not be deemed to have occurred in  respect  of a
particular Change of Control (and thus shall not be  deemed  a Ratings  Event
for  purposes of the definition of Change of Control  Repurchase Event
hereunder) if the Rating Agencies making the reduction in rating to which this
definition  would otherwise apply do not announce or publicly  confirm  or
inform  the Trustee in writing at its request that the reduction was the
result, in  whole or in part, of any event or circumstance comprised of or
arising as  a result  of, or in respect of, the applicable Change of Control
(whether  or  not the  applicable Change of Control shall have occurred at
the time of the Ratings Event).

     "S&P"  means  Standard  & Poor's, a division of The McGraw-Hill
Companies, Inc.

     "Voting  Stock" of any specified "person" (as that term is used in
Section 13(d)(3)  of  the Exchange Act) as of any date means the capital stock
of  such person  that  is at the time entitled to vote generally in the
election  of  the board of directors of such person.

                                  ARTICLE FIVE

                                EVENTS OF DEFAULT

     SECTION 5.01.    Additional Event of Default.

     In  addition to the Events of Default set forth in Section 5.01 of the
Base Indenture, the Notes shall also be subject to the following Event of
Default:

     (i)  a  failure by the Company to repurchase Notes of such series
          tendered for  repurchase  following  the occurrence  of  a  Change
          of  Control Repurchase Event in conformity with Section 4.02.

                                   ARTICLE SIX

                                  MISCELLANEOUS

     SECTION 6.01.    Form of Notes.

     The  Notes and the Trustee's Certificates of Authentication to be
endorsed thereon are to be substantially in the form of Exhibit A, which forms
are hereby incorporated in and made a part of this Supplemental Indenture.

     The  terms and provisions contained in the Notes shall constitute, and
are hereby  expressly made, a part of this Supplemental Indenture, and  the
Company and the Trustee, by their execution and delivery of this Supplemental
Indenture, expressly agree to such terms and provisions and to be bound
thereby.

     Section 6.02.    Ratification of Base Indenture.

     The  Base Indenture, as supplemented by this Supplemental Indenture, is
in all respects ratified and confirmed.

     Section 6.03.    Application of Supplemental Indenture.

     This  Supplemental Indenture shall be deemed part of the Base Indenture
in the manner and to the extent herein and therein provided.

     Section 6.04.    Trust Indenture Act Controls.

     If  any  provision hereof limits, qualifies or conflicts  with  the
duties imposed  by  Sections 310 through 317 of the Trust Indenture  Act,  the
imposed duties shall control.

     Section 6.05.    Conflict with Base Indenture.

     To  the  extent  not  expressly amended or modified  by  this
Supplemental Indenture,  the  Base Indenture shall remain in full force and
effect.   If  any provision  of  this Supplemental Indenture relating to the
Notes is inconsistent with  any  provision of the Base Indenture, the provision
of  this  Supplemental Indenture shall control.

     Section 6.06.    Governing Law.

     THIS  SUPPLEMENTAL  INDENTURE  SHALL  BE  GOVERNED  BY,  AND  CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     Section 6.07.    Successors.

     All  agreements  of  the Company in the Base Indenture,  this
Supplemental Indenture  and  the  Notes shall bind its successors.   All
agreements  of  the Trustee  in  the Base Indenture and this Supplemental
Indenture shall  bind  its successors.

     Section 6.08.    Counterparts.

     This  instrument  may  be executed in any number of counterparts,  each
of which  so  executed shall be deemed to be an original, but all such
counterparts shall together constitute but one and the same instrument.

     Section 6.09.    Trustee Disclaimer.

     The  Trustee  makes no representation as to the validity or sufficiency
of this  Supplemental Indenture other than as to the validity of its execution
and delivery  by the Trustee.  The recitals and statements herein are deemed
to  be those of the Company and not the Trustee.

                  [Remainder of page intentionally left blank]

     IN  WITNESS WHEREOF, the parties to this Supplemental Indenture have
caused it to be duly executed as of the day and year first above written.


                            UNITED STATES STEEL CORPORATION


                            By:/s/ L. T. Brockway
                            ------------------------------------
                            Name:  L. T. Brockway
                            Title: Vice President & Treasurer




                            THE BANK OF NEW YORK MELLON, as Trustee


                            By:/s/ Mary Miselis
                            -------------------------------------
                            Name:  Mary Miselis
                            Title: Vice President




                                    Exhibit A

                   Form of Global Note Representing the Notes