ÁñÁ«ÊÓƵ

Exhibit 24

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder,

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional United States Steel Corporation Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.

POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned does hereby make, constitute and appoint John P. Surma, Jr., Gretchen R. Haggerty, Larry G. Schultz and Larry T. Brockway or any one of them, my true and lawful attorneys-in-fact to sign and execute for me and on my behalf a registration statement on Form S-3 to be filed by ÁñÁ«ÊÓƵ with the Securities and Exchange Commission in connection with the issuance of additional ÁñÁ«ÊÓƵ Common Stock or other securities, and any and all amendments to such registration statement to be filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, in such form as they or any one or more of them may approve, and to do any and all other acts which said attorneys-in-fact may deem necessary or desirable to enable ÁñÁ«ÊÓƵ to comply with said Act and the rules and regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 30^th day of January, 2007.