ÁñÁ«ÊÓƵ

Exhibit 32.2

CHIEF FINANCIAL OFFICER

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

I, Gretchen R. Haggerty, Executive Vice President and Chief Financial Officer of United States Steel Corporation, certify that:

 

  (1) The Quarterly Report on Form 10-Q of ÁñÁ«ÊÓƵ for the period ending September 30, 2006, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

 

  (2) The information contained in the foregoing report fairly presents, in all material respects, the financial condition and results of operations of ÁñÁ«ÊÓƵ.

 

 

/s/ Gretchen R. Haggerty

 

    Gretchen R. Haggerty

 

    Executive Vice President

    and Chief Financial Officer

November 2, 2006

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to ÁñÁ«ÊÓƵ and will be retained by ÁñÁ«ÊÓƵ and furnished to the Securities and Exchange Commission or its staff upon request.