<PAGE>

                                                                      Exhibit 24
                                                                     Page 1 of 6


                                   POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned hereby irrevocably constitutes and appoints JOHN P. 
HARBIN, CHARLES J. KESZLER and ROBERT F. SPEARS, or any of them, as the true 
and lawful agents and attorneys-in-fact of the undersigned (the 
"Attorneys-in-Fact"), each with full power to appoint a substitute or 
substitutes to act hereunder, to execute and deliver for and on behalf of the 
undersigned the Annual Report of Lone Star Technologies, Inc. on Form 10-K 
(including any amendments thereto) to be filed with the Securities and 
Exchange Commission pursuant to the Securities Exchange Act of 1934 for the 
fiscal year ended December 31, 1996.  The undersigned hereby ratifies and 
confirms all that the Attorneys-in-Fact, or any substitute or substitutes, 
may do by virtue of this Power of Attorney.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney 
at Dallas, Texas on this 20th day of February, 1997.



                                        /s/ Dean P. Guerin
                                        ------------------------------
                                        Dean P. Guerin


STATE OF TEXAS         )
                       )
COUNTY OF DALLAS       )

     BEFORE ME, SHARON E. GOODRICH, a Notary Public in and for the State of 
Texas, on this day did personally appear Dean P. Guerin, known to me to be 
the person whose name is subscribed to the foregoing Power of Attorney, and 
acknowledged to me that he executed such Power of Attorney for the purposes 
and consideration therein expressed.

     GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 20th day of February, 1997.



                                        /s/ Sharon E. Goodrich
                                        ------------------------------
                                        Notary Public, State of Texas

(SEAL)

My Commission Expires: 9/14/98

<PAGE>

                                                                      Exhibit 24
                                                                     Page 2 of 6


                                   POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned hereby irrevocably constitutes and appoints JOHN P. 
HARBIN, CHARLES J. KESZLER and ROBERT F. SPEARS, or any of them, as the true 
and lawful agents and attorneys-in-fact of the undersigned (the 
"Attorneys-in-Fact"), each with full power to appoint a substitute or 
substitutes to act hereunder, to execute and deliver for and on behalf of the 
undersigned the Annual Report of Lone Star Technologies, Inc. on Form 10-K 
(including any amendments thereto) to be filed with the Securities and 
Exchange Commission pursuant to the Securities Exchange Act of 1934 for the 
fiscal year ended December 31, 1996.  The undersigned hereby ratifies and 
confirms all that the Attorneys-in-Fact, or any substitute or substitutes, 
may do by virtue of this Power of Attorney.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney 
at Dallas, Texas on this 20th day of February, 1997.



                                        /s/ William C. McCord
                                        ------------------------------
                                        William C. McCord


STATE OF TEXAS         )
                       )
COUNTY OF DALLAS       )

     BEFORE ME, SHARON E. GOODRICH, a Notary Public in and for the State of 
Texas, on this day did personally appear William C. McCord, known to me to be 
the person whose name is subscribed to the foregoing Power of Attorney, and 
acknowledged to me that he executed such Power of Attorney for the purposes 
and consideration therein expressed.

     GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 20th day of February, 1997.



                                        /s/ Sharon E. Goodrich
                                        ------------------------------
                                        Notary Public, State of Texas

(SEAL)

My Commission Expires: 9/14/98

<PAGE>

                                                                      Exhibit 24
                                                                     Page 3 of 6

                             POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned hereby irrevocably constitutes and appoints JOHN P. 
HARBIN, CHARLES J. KESZLER and ROBERT F. SPEARS, or any of them, as the true 
and lawful agents and attorneys-in-fact of the undersigned (the 
"Attorneys-in-Fact"), each with full power to appoint a substitute or 
substitutes to act hereunder, to execute and deliver for and on behalf of the 
undersigned the Annual Report of Lone Star Technologies, Inc. on Form 10-K 
(including any amendments thereto) to be filed with the Securities and 
Exchange Commission pursuant to the Securities Exchange Act of 1934 for the 
fiscal year ended December 31, 1996. The undersigned hereby ratifies and 
confirms all that the Attorneys-in-Fact, or any substitute or substitutes, 
may do by virtue of this Power of Attorney.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney 
at Dallas, Texas on this 20th day of February, 1997.


                                     
                                     /s/  Charles L. Blackburn      
                                     -------------------------------
                                     Charles L. Blackburn



STATE OF TEXAS     )
                   )
COUNTY OF DALLAS   )

     BEFORE ME, SHARON E. GOODRICH, a Notary Public in and for the State of 
Texas, on this day did personally appear Charles L. Blackburn, known to me to 
be the person whose name is subscribed to the foregoing Power of Attorney, 
and acknowledged to me that he executed such Power of Attorney for the 
purposes and consideration therein expressed.

     GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 20th day of February, 1997.



                                      /s/  Sharon E. Goodrich         
                                      ------------------------------- 
                                      Notary Public, State of Texas   

(SEAL) 

My Commission Expires: 9/14/98

<PAGE>

                                                                      Exhibit 24
                                                                     Page 4 of 6

                             POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned hereby irrevocably constitutes and appoints JOHN P. 
HARBIN, CHARLES J. KESZLER and ROBERT F. SPEARS, or any of them, as the true 
and lawful agents and attorneys-in-fact of the undersigned (the 
"Attorneys-in-Fact"), each with full power to appoint a substitute or 
substitutes to act hereunder, to execute and deliver for and on behalf of the 
undersigned the Annual Report of Lone Star Technologies, Inc. on Form 10-K 
(including any amendments thereto) to be filed with the Securities and Exchange 
Commission pursuant to the Securities Exchange Act of 1934 for the fiscal year 
ended December 31, 1996. The undersigned hereby ratifies and confirms all that 
the Attorneys-in-Fact, or any substitute or substitutes, may do by virtue of 
this Power of Attorney.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney 
at Dallas, Texas on this 20th day of February, 1997.


                                     
                                     /s/  Frederick B. Hegi, Jr.     
                                     ------------------------------- 
                                     Frederick B. Hegi, Jr.          



STATE OF TEXAS     )
                   )
COUNTY OF DALLAS   )

     BEFORE ME, SHARON E. GOODRICH, a Notary Public in and for the State of 
Texas, on this day did personally appear Frederick B. Hegi, Jr., known to me to 
be the person whose name is subscribed to the foregoing Power of Attorney, and 
acknowledged to me that he executed such Power of Attorney for the purposes and 
consideration therein expressed.

     GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 20th day of February, 1997.



                                      /s/  Sharon E. Goodrich         
                                      ------------------------------- 
                                      Notary Public, State of Texas   

(SEAL)

My Commission Expires: 9/14/98

<PAGE>
                                       
                                                                      Exhibit 24
                                                                     Page 5 of 6

                                       
                               POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned hereby irrevocably constitutes and appoints 
JOHN P. HARBIN, CHARLES J. KESZLER and ROBERT F. SPEARS, or any of them, 
as the true and lawful agents and attorneys-in-fact of the undersigned 
(the "Attorneys-in-Fact"), each with full power to appoint a substitute or 
substitutes to act hereunder, to execute and deliver for and on behalf of 
the undersigned the Annual Report of Lone Star Technologies, Inc. on 
Form 10-K (including any amendments thereto) to be filed with the Securities 
and Exchange Commission pursuant to the Securities Exchange Act of 1934 for 
the fiscal year ended December 31, 1996. The undersigned hereby ratifies and 
confirms all that the Attorneys-in-Fact, or any substitute or substitutes, 
may do by virtue of this Power of Attorney.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney 
at Dallas, Texas on this 20th day of February, 1997.



                                            /s/ James E. McCormick
                                            -----------------------------
                                            James E. McCormick



STATE OF TEXAS        )
                      )
COUNTY OF DALLAS      )

     BEFORE ME, SHARON E. GOODRICH, a Notary Public in and for the State of 
Texas, on this day did personally appear James E. McCormick, known to me to 
be the person whose name is subscribed to the foregoing Power of Attorney, 
and acknowledged to me that he executed such Power of Attorney for the 
purposes and consideration therein expressed.

     GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 20th day of February, 1997.



                                            /s/ Sharon E. Goodrich
                                            -----------------------------
                                            Notary Public, State of Texas



(SEAL)

My Commission Expires: 9/14/98

<PAGE>
                                       
                                                                      Exhibit 24
                                                                     Page 6 of 6

                                       
                               POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned hereby irrevocably constitutes and appoints 
JOHN P. HARBIN, CHARLES J. KESZLER and ROBERT F. SPEARS, or any of them, 
as the true and lawful agents and attorneys-in-fact of the undersigned 
(the "Attorneys-in-Fact"), each with full power to appoint a substitute or 
substitutes to act hereunder, to execute and deliver for and on behalf of 
the undersigned the Annual Report of Lone Star Technologies, Inc. on 
Form 10-K (including any amendments thereto) to be filed with the Securities 
and Exchange Commission pursuant to the Securities Exchange Act of 1934 for 
the fiscal year ended December 31, 1996. The undersigned hereby ratifies and 
confirms all that the Attorneys-in-Fact, or any substitute or substitutes, 
may do by virtue of this Power of Attorney.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney 
at Dallas, Texas on this 20th day of February, 1997.



                                            /s/ Thomas M. Mercer, Jr.
                                            -----------------------------
                                            Thomas M. Mercer, Jr.



STATE OF TEXAS        )
                      )
COUNTY OF DALLAS      )

     BEFORE ME, SHARON E. GOODRICH, a Notary Public in and for the State of 
Texas, on this day did personally appear Thomas M. Mercer, Jr., known to me 
to be the person whose name is subscribed to the foregoing Power of Attorney, 
and acknowledged to me that he executed such Power of Attorney for the 
purposes and consideration therein expressed.

     GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 20th day of February, 1997.



                                            /s/ Sharon E. Goodrich
                                            -----------------------------
                                            Notary Public, State of Texas



(SEAL)

My Commission Expires: 9/14/98