Document:

Maverick Tube Corporation

                  Seventh Amendment to Secured Credit Agreement

Harris Trust and Savings Bank
Chicago, Illinois

Firstar Bank Missouri, N.A.
   (successor by merger to Mercantile Bank National Association)
St. Louis, Missouri

Ladies and Gentlemen:

Reference is hereby made to that certain  Secured Credit  Agreement  dated as of
September  18, 1998 (as  heretofore  amended the "Credit  Agreement")  among the
undersigned, Maverick Tube Corporation, a Delaware corporation (the "Borrower"),
you (the "Banks") and Harris Trust and Savings Bank, as agent for the Banks (the
"Agent").  All defined  terms used herein  shall have the same meaning as in the
Credit Agreement unless otherwise defined herein.

The Borrower,  the Agent and the Banks wish to amend the Credit Agreement and to
modify  certain other terms and conditions of the Credit  Agreement,  all on the
terms and conditions set forth in this Amendment.

Section 1.           Amendments to Credit Agreement.

Upon  satisfaction  of all of the  conditions  precedent  set forth in Section 2
hereof, the Credit Agreement shall be amended as follows:

1.1.  The first  paragraph of Section  1.1(b) of the Credit  Agreement is hereby
amended in its entirety and as so amended shall be restated to read as follows:

(b) The  Revolving  Credit shall consist of a base  revolving  credit (the "Base
Credit") in an aggregate  principal  amount at any one time outstanding of up to
$50,000,000,  which  shall be  available  at all times  during  the term of this
Agreement and an excess  revolving  credit (the "Excess Credit") in an aggregate
principal amount at any one time  outstanding of up to $20,000,000,  which shall
be  available  only  during the  period  commencing  on August  14,  2000 to and
including October 31, 2000 (the "Excess Credit Availability Period").

1.2. Section 7.16 of the Credit Agreement shall be amended by adding thereto the
following sentence immediately at the end thereof:

Notwithstanding  anything  contained  in this 7.16 to the  contrary,  the sum of
(i) all  investments  by the Borrower or any  Guarantor in,  (ii) all  loans and
advances by the Borrower or any Guarantor  to, and  (iii) all  guarantees by the
Borrower or any  Guarantor of  indebtedness  of, any  Subsidiary of the Borrower
which is not a Guarantor  shall not  aggregate an amount in excess of $1,000,000
at any one time outstanding.

1.3.  Exhibit E to the Credit Agreement is hereby amended in its entirety and as
so amended shall be restated to read as set forth on Exhibit E hereto.

1.4.  Exhibit L to the Credit Agreement is hereby amended in its entirety and as
so amended shall be restated to read as set forth on Exhibit L hereto.

Section 2.           Waiver

2.1. The Borrower has informed the Banks that it is  contemplating  the purchase
(such purchase being referred to herein as the "Prudential Purchase") of 100% of
the issued and  outstanding  capital stock of Prudential  Steel Ltd., an Alberta
Corporation  ("Prudential"),  on the  terms  and  conditions  set  forth in that
certain  Combination  Agreement dated as of June 11,  2000, between the Borrower
and Prudential. Sections 7.6(d) and 7.16(i) of the Credit Agreement restrict the
Borrower's  ability to enter into  mergers and  acquisitions.  The  Borrower has
requested that the Banks waive  compliance with  Sections 7.6(d)  and 7.16(i) of
the  Credit  Agreement  in  order  to  permit   consummation  of  the  Purchase.
Accordingly,  the Banks hereby waive compliance with Sections 7.6(d) and 7.16(i)
of the Credit Agreement to the extent and only to the extent necessary to permit
the Company to consummate the Prudential Purchase.

2.2. The Borrower  has  informed  the Banks that it was not in  compliance  with
Section 7.9 of the Credit Agreement during the period from and including June 1,
2000 through and including August 31,  2000. The Borrower has requested that the
Banks waive  compliance  with  Section 7.9 of the Credit  Agreement  during such
period.  Accordingly,  the Banks hereby waive  compliance  by the Borrower  with
Section 7.9  of the Credit  Agreement for the period from and including  June 1,
2000 through and including August 31, 2000.

2.3. The Borrower hereby  acknowledges  and agrees that it remains  obligated to
comply with all other terms and conditions of the Credit  Agreement and the Loan
Documents as if the waivers set forth above had not been granted.

Section 3.           Conditions Precedent.

The effectiveness of this Amendment is subject to the satisfaction of all of the
following conditions precedent:

3.1. The Borrower,  the Agent and the Banks shall have  executed this  Amendment
(such  execution may be in several  counterparts  and the several parties hereto
may execute on separate counterparts).

3.2.  The Agent shall have  received  copies  (executed  or  certified as may be
appropriate) of all legal documents or proceedings  taken in connection with the
execution and delivery of this Amendment and the other instruments and documents
contemplated  hereby and an opinion  of  counsel  to the  Borrower,  in form and
substance satisfactory to the Banks.

3.3.  The Agent  shall have  received  copies,  certified  by the  secretary  or
assistant secretary of the Borrower,  of resolutions  regarding the transactions
contemplated  by this  Amendment,  duly adopted by the Board of Directors of the
Borrower, and satisfactory in form and substance to all of the Banks.

3.4. A Guarantor's Consent for the benefit of the Banks shall have been executed
and  delivered  by each  Guarantor  to the  Agent,  a form of which is  attached
hereto.

3.5.  The  Borrower  shall  be in full  compliance  with  all of the  terms  and
conditions of the Loan  Documents  and no Event of Default or Potential  Default
shall have  occurred and be  continuing  thereunder or shall result after giving
effect to this Amendment.

3.6. The Agent shall receive on behalf of the Banks certified executed copies of
the Combination Agreement and each of the other documents and opinions set forth
in Article Five and Article Seven of the Combination Agreement.

3.7.  Legal matters  incident to the  execution  and delivery of this  Amendment
shall be satisfactory to each of the Banks and their legal counsel.

Section 4.           Representations And Warranties.

The Borrower, by its execution of this Amendment,  hereby certifies and warrants
the following:

(a) each of the  representations  and  warranties  set forth in Section 5 of the
Credit  Agreement  is true and  correct as of the date  hereof as if made on the
date  hereof,   except  that  the  representations  and  warranties  made  under
Section 5.2  shall be deemed to refer to the most recent annual report furnished
to the Banks by the Borrower; and

(b) the Borrower is in full  compliance  with all of the terms and conditions of
the Credit  Agreement and no Event of Default or Potential  Default has occurred
and is continuing thereunder.

Section 5.           Miscellaneous.

5.1.  The  Borrower  has  heretofore  executed  and  delivered  to the Agent the
Security  Agreement  and the Borrower  hereby  agrees that  notwithstanding  the
execution and delivery  hereof,  such Security  Agreement shall be and remain in
full force and effect and that any rights and remedies of the Agent  thereunder,
obligations  of the  Borrower  thereunder  and any liens or  security  interests
created or provided for thereunder shall be and remain in full force and effect,
shall not be affected,  impaired or  discharged  thereby and shall secure all of
its  indebtedness,  obligations and liabilities to the Agent and the Banks under
the Credit  Agreement as amended hereby.  Nothing herein  contained shall in any
manner affect or impair the priority of the liens and security interests created
and provided for by the Security Agreement as to the indebtedness which would be
secured thereby prior to giving effect hereto.

5.2.  Reference  to this  specific  Amendment  need  not be  made  in any  note,
document,  letter,  certificate,  any security  agreement,  or any communication
issued  or made  pursuant  to or  with  respect  to the  Credit  Agreement,  any
reference  to the  Credit  Agreement  being  sufficient  to refer to the  Credit
Agreement as amended hereby.

5.3. This  Amendment may be executed in any number of  counterparts,  and by the
different parties on different  counterparts,  all of which taken together shall
constitute  one and the same  agreement.  Any of the parties  hereby may execute
this  agreement by signing any such  counterpart  and each of such  counterparts
shall for all  purposes be deemed to be an  original.  This  agreement  shall be
governed by the internal laws of the State of Illinois.

5.4. The Borrower  agrees to pay all  reasonable  costs and expenses,  including
without limitation  attorneys fees,  incurred by the Agent and each of the Banks
in connection with the preparation,  negotiation, execution and delivery of this
Amendment and the other documents contemplated hereby.
<PAGE>
Upon acceptance hereof by the Agent and the Banks in the manner  hereinafter set
forth,  this  Amendment  shall  be  a  contract  between  us  for  the  purposes
hereinabove set forth.

         Dated as of September 22, 2000.

                             Maverick Tube Corporation

                             By   /s/  Gregg Eisenberg
                                  Its   President

         Accepted and agreed to as of the day and year last above written.

                             Harris Trust and Savings Bank,
                              individually and as Agent

                             By    /s/  Bonnie Ogden
                                   Its Vice President

                             Firstar Bank Missouri, N.A. (successor by merger to
                               Mercantile Bank National Association)

                             By    /s/  David Higbee
                                   Its  Vice President
<PAGE>
                               Guarantor's Consent

The undersigned,  Maverick  Investment  Corporation and Maverick Tube, L.P. have
heretofore  executed  and  delivered  to the Banks a  Guaranty  Agreement  dated
September  18, 1998 (the  "Guaranty"),  pursuant to which the  undersigned  have
jointly  and  severally  guaranteed  all of the  indebtedness,  obligations  and
liabilities of Maverick Tube  Corporation  owing to the Agent and the Banks. The
undersigned  hereby agree that Maverick Tube Corporation and the Banks may enter
into the foregoing Amendment and the transactions contemplated thereby, and that
the  foregoing  Amendment  shall not in any way  affect or impair or modify  the
terms or  provisions  of,  or the  obligations  of the  undersigned  under,  the
Guaranty.  The  undersigned  further  agree  that their  consent to any  further
amendments to the Loan  Documents,  or to the  foregoing  Amendment or any other
documents which the Banks and Maverick Tube Corporation may enter into from time
to time hereafter, shall not be required as a result of this consent having been
obtained.

                             Maverick Investment Corporation

                             By    /s/  Gregg Eisenberg
                                   Its   President

                             Maverick Tube, L.P.

                             By:   Maverick Tube Corporation
                                   Its:   General Partner

                             By    /s/   Gregg Eisenberg
                                   Its   PresidentMaverick Tube Corporation

                  Eighth Amendment to Secured Credit Agreement

Harris Trust and Savings Bank
Chicago, Illinois

Firstar Bank Missouri, N.A.
   (successor by merger to Mercantile Bank National Association)
St. Louis, Missouri

Ladies and Gentlemen:

Reference is hereby made to that certain  Secured Credit  Agreement  dated as of
September  18, 1998 (as  heretofore  amended the "Credit  Agreement")  among the
undersigned, Maverick Tube Corporation, a Delaware corporation (the "Borrower"),
you (the "Banks") and Harris Trust and Savings Bank, as agent for the Banks (the
"Agent").  All defined  terms used herein  shall have the same meaning as in the
Credit Agreement unless otherwise defined herein.

The Borrower,  the Agent and the Banks wish to amend the Credit Agreement and to
modify  certain other terms and conditions of the Credit  Agreement,  all on the
terms and conditions set forth in this Amendment.

Section 1.           Amendments to Credit Agreement.

Upon  satisfaction  of all of the  conditions  precedent  set forth in Section 2
hereof, the Credit Agreement shall be amended as follows:

1.1.  The first  paragraph of Section  1.1(b) of the Credit  Agreement is hereby
amended in its entirety and as so amended shall be restated to read as follows:

(b) The  Revolving  Credit shall consist of a base  revolving  credit (the "Base
Credit") in an aggregate  principal  amount at any one time outstanding of up to
$50,000,000,  which  shall be  available  at all times  during  the term of this
Agreement and an excess  revolving  credit (the "Excess Credit") in an aggregate
principal amount at any one time  outstanding of up to $20,000,000,  which shall
be  available  only  during the  period  commencing  on August  14,  2000 to and
including December 31, 2000 (the "Excess Credit Availability Period").

Section 2.           Waiver

2.1. The Borrower has informed the Banks that it was not in compliance  with (i)
Section 7.26 of the Credit  Agreement  during the  Borrower's  fiscal year ended
September  30,  2000 and  (ii)  Section  7.12 of the  Credit  Agreement  for the
Borrower's  fiscal quarter ended  September 30, 2000. The Borrower has requested
that the Banks waive compliance with Section 7.26 of the Credit Agreement during
such fiscal year and that the Banks waive  compliance  with  Section 7.12 of the
Credit  Agreement for such fiscal quarter.  Accordingly,  the Banks hereby waive
compliance by the Borrower  with  Section 7.26  of the Credit  Agreement for the
Borrower's  fiscal year ended  September 30, 2000 and Section 7.12 of the Credit
Agreement  for the  Borrower's  fiscal  quarter ended  September  30, 2000.  The
Borrower hereby acknowledges and agrees that it remains obligated to comply with
all other terms and conditions of the Credit Agreement and the Loan Documents as
if the waivers set forth above had not been granted.

Section 3.           Conditions Precedent.

The effectiveness of this Amendment is subject to the satisfaction of all of the
following conditions precedent:

3.1. The Borrower,  the Agent and the Banks shall have  executed this  Amendment
(such  execution may be in several  counterparts  and the several parties hereto
may execute on separate counterparts).

3.2.  The Agent shall have  received  copies  (executed  or  certified as may be
appropriate) of all legal documents or proceedings  taken in connection with the
execution and delivery of this Amendment and the other instruments and documents
contemplated  hereby and an opinion  of  counsel  to the  Borrower,  in form and
substance satisfactory to the Banks.

3.3. A Guarantor's Consent for the benefit of the Banks shall have been executed
and  delivered  by each  Guarantor  to the  Agent,  a form of which is  attached
hereto.

3.4.  The  Borrower  shall  be in full  compliance  with  all of the  terms  and
conditions of the Loan  Documents  and no Event of Default or Potential  Default
shall have  occurred and be  continuing  thereunder or shall result after giving
effect to this Amendment.

3.5.  Legal matters  incident to the  execution  and delivery of this  Amendment
shall be satisfactory to each of the Banks and their legal counsel.

Section 4.           Representations And Warranties.

The Borrower, by its execution of this Amendment,  hereby certifies and warrants
the following:

(a) each of the  representations  and  warranties  set forth in Section 5 of the
Credit  Agreement  is true and  correct as of the date  hereof as if made on the
date  hereof,   except  that  the  representations  and  warranties  made  under
Section 5.2  shall be deemed to refer to the most recent annual report furnished
to the Banks by the Borrower; and

(b) the Borrower is in full  compliance  with all of the terms and conditions of
the Credit  Agreement and no Event of Default or Potential  Default has occurred
and is continuing thereunder.

Section 5.           Miscellaneous.

5.1.  The  Borrower  has  heretofore  executed  and  delivered  to the Agent the
Security  Agreement  and the Borrower  hereby  agrees that  notwithstanding  the
execution and delivery  hereof,  such Security  Agreement shall be and remain in
full force and effect and that any rights and remedies of the Agent  thereunder,
obligations  of the  Borrower  thereunder  and any liens or  security  interests
created or provided for thereunder shall be and remain in full force and effect,
shall not be affected,  impaired or  discharged  thereby and shall secure all of
its  indebtedness,  obligations and liabilities to the Agent and the Banks under
the Credit  Agreement as amended hereby.  Nothing herein  contained shall in any
manner affect or impair the priority of the liens and security interests created
and provided for by the Security Agreement as to the indebtedness which would be
secured thereby prior to giving effect hereto.

5.2.  Reference  to this  specific  Amendment  need  not be  made  in any  note,
document,  letter,  certificate,  any security  agreement,  or any communication
issued  or made  pursuant  to or  with  respect  to the  Credit  Agreement,  any
reference  to the  Credit  Agreement  being  sufficient  to refer to the  Credit
Agreement as amended hereby.

5.3. This  Amendment may be executed in any number of  counterparts,  and by the
different parties on different  counterparts,  all of which taken together shall
constitute  one and the same  agreement.  Any of the parties  hereby may execute
this  agreement by signing any such  counterpart  and each of such  counterparts
shall for all  purposes be deemed to be an  original.  This  agreement  shall be
governed by the internal laws of the State of Illinois.

5.4. The Borrower  agrees to pay all  reasonable  costs and expenses,  including
without limitation  attorneys fees,  incurred by the Agent and each of the Banks
in connection with the preparation,  negotiation, execution and delivery of this
Amendment and the other documents contemplated hereby.
<PAGE>
Upon acceptance hereof by the Agent and the Banks in the manner  hereinafter set
forth,  this  Amendment  shall  be  a  contract  between  us  for  the  purposes
hereinabove set forth.

         Dated as of October 31, 2000.

                             Maverick Tube Corporation

                             By    /s/  Gregg Eisenberg
                                   Its   President

         Accepted and agreed to as of the day and year last above written.

                             Harris Trust and Savings Bank,
                              individually and as Agent

                             By    /s/  Haig C. Garbedian
                                   Its  Vice President

                             Firstar Bank Missouri, N.A. (successor by merger to
                              Mercantile Bank National Association)

                             By    /s/  David Higbee
                                   Its  Vice President
<PAGE>
                               Guarantor's Consent

The undersigned,  Maverick  Investment  Corporation and Maverick Tube, L.P. have
heretofore  executed  and  delivered  to the Banks a  Guaranty  Agreement  dated
September  18, 1998 (the  "Guaranty"),  pursuant to which the  undersigned  have
jointly  and  severally  guaranteed  all of the  indebtedness,  obligations  and
liabilities of Maverick Tube  Corporation  owing to the Agent and the Banks. The
undersigned  hereby agree that Maverick Tube Corporation and the Banks may enter
into the foregoing Amendment and the transactions contemplated thereby, and that
the  foregoing  Amendment  shall not in any way  affect or impair or modify  the
terms or  provisions  of,  or the  obligations  of the  undersigned  under,  the
Guaranty.  The  undersigned  further  agree  that their  consent to any  further
amendments to the Loan  Documents,  or to the  foregoing  Amendment or any other
documents which the Banks and Maverick Tube Corporation may enter into from time
to time hereafter, shall not be required as a result of this consent having been
obtained.

                              Maverick Investment Corporation

                              By   /s/  Gregg Eisenberg
                                   Its   President

                              Maverick Tube, L.P.

                              By:   Maverick Tube Corporation
                                    Its:   General Partner

                              By    /s/  Gregg Eisenberg
                                    Its   President

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