UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             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):
                                 March 28, 2007


                         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.)
    incorporation)

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

                                 (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
     240.14a-12)

[  ] 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.

Effective as of March 28, 2007, United States Steel Corporation ("U. S. Steel")
entered into a Commitment Letter with JPMorgan Chase Bank, N.A.
("JPMorgan Chase") and J.P. Morgan Securities, Inc. ("JPMorgan") pursuant to
which (i) JPMorgan agreed to structure, arrange and syndicate for U. S. Steel
three senior credit facilities in an aggregate amount of $1,750,000,000
(the "Facilities"); and (ii) JPMorgan Chase committed to provide the full
amount of the Facilities and to serve as administrative agent for the
Facilities.

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

The disclosure under Item 1.01 of this Current Report on Form 8-K is
incorporated in this Item 2.03 by reference.


SIGNATURE

     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.

UNITED STATES STEEL CORPORATION


By   /s/ Larry G. Schultz
     ---------------------------
     Larry G. Schultz
     Vice President & Controller



Dated:  April 3, 2007