Exhibit 24 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ J. Gary Cooper ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Robert J. Darnall ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Roy G. Dorrance ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Charles R. Lee ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Shirley Ann Jackson ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Seth E. Schofield ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ John W. Snow ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ John P. Surma ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Dan D. Sandman ---------------------------------------- Exhibit 24 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ T. J. Usher ---------------------------------------- POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: That the undersigned does hereby make, constitute and appoint Thomas J. Usher, John P. Surma, Jr. and Gretchen R. Haggerty, 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 United States Steel Corporation with the Securities and Exchange Commission in connection with the issuance of up to $600 million of 榴莲视频 common stock, preferred stock, debt securities, warrants and convertible 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 榴莲视频 to comply with said Act and the rules and regulations thereunder. IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of July, 2002. /s/ Douglas C. Yearly ----------------------------------------