EXHIBIT 24

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ J. Gary Cooper
                                             --------------------------------
                                             J. Gary Cooper




                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 13th day of November,
2001.

                                             /s/ Robert J. Darnall
                                             --------------------------------
                                             Robert J. Darnall



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Roy G. Dorrance
                                             --------------------------------
                                             Roy G. Dorrance


                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Dr. Shirley Ann Jackson
                                             --------------------------------
                                             Dr. Shirley Ann Jackson



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Charles R. Lee
                                             --------------------------------
                                             Charles R. Lee



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Paul E. Lego
                                             --------------------------------
                                             Paul E. Lego



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ John F. McGillicuddy
                                             --------------------------------
                                             John F. McGillicuddy



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Dan D. Sandman
                                             --------------------------------
                                             Dan D. Sandman



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Seth E. Schofield
                                             --------------------------------
                                             Seth E. Schofield



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ John W. Snow
                                             --------------------------------
                                             John W. Snow



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ John P. Surma, Jr.
                                             --------------------------------
                                             John P. Surma, Jr.



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Thomas J. Usher
                                             --------------------------------
                                             Thomas J. Usher



                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS:

     That, effective immediately following the Separation (as defined in the
Agreement and Plan of Reorganization between USX Corporation and United States
Steel LLC dated as of July 31, 2001), the undersigned does hereby make,
constitute and appoint John P. Surma, Jr., Albert E. Ferrara, Jr. and Gretchen
R. Haggerty, or any one of them, my true and lawful attorneys-in-fact, each with
the power of substitution and resubstitution, to sign, execute and file for me
and on my behalf one or more registration statements registering United States
Steel Corporation common stock to be issued pursuant to various employee benefit
plans and dividend reinvestment/direct stock purchase plans as may be required
and/or contemplated in connection with the Separation, and any exhibits thereto,
including post-effective amendments to existing registration statements of USX
Corporation (for adoption by United States Steel Corporation), on forms
prescribed by the Securities and Exchange Commission (collectively,
"Registration Statements"), and any and all amendments to the Registration
Statements or further registration statements 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 United States Steel Corporation to comply with said Act and the rules and
regulations thereunder.

     IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of November,
2001.

                                             /s/ Douglas C. Yearley
                                             --------------------------------
                                             Douglas C. Yearley