<PAGE>
 
                                                                      EXHIBIT 24



                              RYERSON TULL, INC.

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---
1999.



                                    /s Jameson A. Baxter
                                    ----------------------------------------
                                    Jameson A. Baxter
 
<PAGE>
 
                              RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---    
1999.

                                    /s/ R.G. Cline
                                    -----------------------------------------
                                    R.G. Cline
 
<PAGE>
 
                               RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---  
1999.

                                    /s/ Ronald L. Thompson
                                    ----------------------------------------
                                    Ronald L. Thompson
<PAGE>
 
                              RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---
1999.

                                    /s/ Jean-Pierre Rosso
                                    ----------------------------------------
                                    Jean-Pierre Rosso
<PAGE>
 
                              RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---            
1999.

                                    /s/ Donald S. Perkins
                                    ----------------------------------------
                                    Donald S. Perkins
<PAGE>
 
                              RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---              
1999.

                                    /s/ Jerry K. Pearlman
                                    ----------------------------------------
                                    Jerry K. Pearlman
<PAGE>
 
                               RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---
1999.

                                    /s/ Neil S. Novich
                                    ----------------------------------------
                                    Neil S. Novich
 
<PAGE>
 
                              RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---
1999.



                                      /s/ Gregory P. Josefowicz
                                     --------------------------------------
                                    Gregory P. Josefowicz
<PAGE>
 
                              RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---             
1999.

                                    /s/ Gary L. Crittenden
                                    ----------------------------------------
                                    Gary L. Crittenden
<PAGE>
 
                               RYERSON TULL, INC.

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that I, the undersigned, as a director
and(or) officer of Ryerson Tull, Inc., a Delaware corporation, do hereby
nominate, constitute and appoint  Jay M. Gratz, Neil S. Novich, Terence R.
Rogers,  and George A. Ranney, Jr., or any one or more of them, my true and
lawful attorneys and agents to do any and all acts and things and execute any
and all instruments which said attorneys and agents, or any of them, may deem
necessary or advisable to enable said Ryerson Tull, Inc. to comply with the
Securities Exchange Act of 1934, as amended, and any requirements of the
Securities and Exchange Commission in respect thereof, in connection with the
preparation and filing of the Annual Report on Form 10-K of said Ryerson Tull,
Inc. for the fiscal year ended December 31, 1998, including specifically, but
without limitation thereof, full power and authority to sign my name as a
director and(or) officer of said Ryerson Tull, Inc. to said Annual Report on
Form 10-K and any amendment thereto, hereby ratifying and confirming all that
said attorneys and agents, or any of them, shall do or cause to be done by
virtue thereof.

     IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of March,
                                                          ---              
1999.



                                    /s/ James A. Henderson
                                    ----------------------------------------
                                    James A. Henderson