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.