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):
                                  May 10, 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 8.01. Other Events

On May 11, 2007, United States Steel Corporation ("U. S. Steel") and Lone Star
Technologies, Inc. ("Lone Star") issued a press release announcing that they had
received notice from the Federal Trade Commission of early termination of the
Hart-Scott-Rodino waiting period on May 10, 2007 in connection with
U. S. Steel's proposed acquisition of Lone Star.  A copy of the joint press
release in substantially the form released is filed herewith as Exhibit 99.1.

Item 9.01. Financial Statements and Exhibits

     (d)  Exhibits

         99.1 Press release titled "U. S. Steel and Lone Star Announce Early
              Termination of Hart-Scott-Rodino Waiting Period"


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:  May 15, 2007