<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 JUDITH A. MURRELL, 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 and Exchange Act of 1934 for the fiscal year ended
December 31, 1995. 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 28TH day of February, 1996.



                                  /S/ Dean P. Guerin
                                  ------------------
                                  Dean P. Guerin




STATE OF TEXAS               )
                             )
COUNTY OF DALLAS  )



    BEFORE ME,  STACI GIBSON , 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 28TH day of February, 1996.




                                  /S/ Staci Gibson
                                  -----------------------------
                                  Notary Public, State of Texas



(SEAL)



My Commission Expires: June 2, 1999

<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 JUDITH A. MURRELL, 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 and Exchange Act of 1934 for the fiscal year ended
December 31, 1995. 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 28TH day of February, 1996.


                                  /S/ William C. McCord
                                  ---------------------
                                  William C. McCord


STATE OF TEXAS               )
                             )
COUNTY OF DALLAS  )



    BEFORE ME, STACI GIBSON , 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 28TH day of February, 1996.



                                  /S/ Staci Gibson
                                  -----------------------------
                                  Notary Public, State of Texas



(SEAL)


My Commission Expires: June 2, 1999

<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 JUDITH A. MURRELL, 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 and Exchange Act of 1934 for the fiscal year ended
December 31, 1995. 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 28TH day of February, 1996.



                             /S/ Charles L. Blackburn
                             ------------------------
                             Charles L. Blackburn



STATE OF TEXAS               )
                             )
COUNTY OF DALLAS  )



    BEFORE ME, STACI GIBSON , 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 28TH day of February, 1996.




                                  /S/ Staci Gibson
                                  -----------------------------
                                  Notary Public, State of Texas



(SEAL)



My Commission Expires: June 2, 1999
<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 JUDITH A. MURRELL, 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 
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 and Exchange Act of 1934 for the fiscal year ended
December 31, 1995. 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 28TH day of February, 1996.



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


STATE OF TEXAS               )
                             )
COUNTY OF DALLAS  )



    BEFORE ME, STACI GIBSON , 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 28TH day of February, 1996.




                             /S/ Staci Gibson
                             -----------------------------
                             Notary Public, State of Texas



(SEAL)



My Commission Expires: June 2, 1999 
<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 JUDITH A. MURRELL, 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 file Securities and Exchange Commission
pursuant to the Securities and Exchange Act of 1934 for the fiscal year ended
December 31, 1995. 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 28TH day of February, 1996.



                             /S/ James E. McCormick
                             ----------------------
                             James E. McCormick



STATE OF TEXAS               )
                             )
COUNTY OF DALLAS  )



    BEFORE ME, STACI GIBSON , a Notary Public in and for the State of Texas,
on this day did personally appear JAMES E. MCCORMICK, known to me to be file
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 28TH day of February, 1996.



                             /S/ Staci Gibson
                             -----------------------------
                             Notary Public, State of Texas



(SEAL)



My Commission Expires: June 2, 1999 
<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 JUDITH A. MURRELL, 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 file undersigned the
Annual Report of Lone Star Technologies, Inc. on Form 10-K (including any
amendments thereto) to be filed with file Securities and Exchange Commission
pursuant to file Securities and Exchange Act of 1934 for the fiscal year ended
December 31, 1995. 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, file undersigned has executed this Power of Attorney at
Dallas, Texas on this 28TH day of February, 1996.



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


STATE OF TEXAS               )
                             )
COUNTY OF DALLAS  )



    BEFORE ME, STACI GIBSON , 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 28TH day of February, 1996.



                             /S/ Staci Gibson
                             -----------------------------
                             Notary Public, State of Texas


(SEAL)



My Commission Expires: June 2, 1999