Washington, D.C.  20549


                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934


                Date of Report (Date of earliest event reported):
                                   May 4, 2009

                         United States Steel Corporation
             (Exact name of registrant as specified in its charter)

       Delaware                1-16811               25-1897152
   ---------------     ----------------------    -------------------
   (State or other        (Commission File          (IRS Employer
   jurisdiction of             Number)           Identification No.)

       600 Grant Street, Pittsburgh, PA              15219-2800
      ----------------------------------             ----------
       (Address of principal executive               (Zip Code)

                                 (412) 433-1121
                         (Registrant's telephone number,
                              including area code)


Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[  ] Written communications pursuant to Rule 425 under the Securities Act (17
     CFR 230.425)

[  ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR

[  ] Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))

[  ] Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))


Item 1.01  Entry into a Material Definitive Agreement

Pursuant  to  an  Indenture dated as of May 21, 2007 (the  "Indenture")  between
United States Steel Corporation (the "Corporation") and The Bank of New York, as
trustee  (the  "Trustee"),  a copy of which was filed  as  Exhibit  4.1  to  the
Corporation's Report on Form 8-K filed on May 22, 2007, the Corporation and  the
Trustee entered into a Third Supplemental Indenture dated as of May 4, 2009 (the
"Supplemental Indenture").  The Supplemental Indenture provides for the issuance
and  sets forth the terms (such as the conversion features) of the Corporation's
4.00%  Senior  Convertible  Notes  due 2014  (the  "Notes").   The  Supplemental
Indenture  also  contains covenants regarding limitations  on  liens  and  sale-
leasebacks  and the purchase of the Notes upon a change of control  as  well  as
other customary provisions.

A copy of the Supplemental Indenture is attached as Exhibit 4.1 to this
Form 8-K.

Item 2.03  Creation of a Direct Financial Obligation or an Obligation under an
Off-Balance Sheet Arrangement of a Registrant.

On May 4, 2009, the Corporation consummated the issuance and sale of
$862,500,000 principal amount of the Notes pursuant to the terms of the
Indenture and the Supplemental Indenture.  The material terms of the Notes are
set forth in the Notes and in the Indenture and the Supplemental Indenture.

A specimen Note is attached as Exhibit 4.2 to this Form 8-K.

Item 9.01  Financial Statements and Exhibits

     (d)  Exhibits

          4.1  Third Supplemental Indenture dated May 4, 2009 to Indenture
               dated as of May 21, 2007

          4.2  4.00% Specimen Senior Convertible Note due 2014


     Pursuant  to the requirements of the Securities Exchange Act of  1934,  the
registrant  has  duly  caused this report to be signed  on  its  behalf  by  the
undersigned hereunto duly authorized.


By   /s/ Gregory A. Zovko
     Gregory A. Zovko
     Vice President & Controller

Dated:  May 5, 2009