Document:

<PAGE>

                                                                     EXHIBIT 4-K

                                   AMENDMENT 1
                                       TO
                         NATIONAL STEEL CREDIT AGREEMENT

        AMENDMENT 1 (this "Amendment"), dated as of May 16, 2000, by and among
National Steel Corporation (the "Borrower"), the financial institutions parties
hereto (the "Consenting Lenders"), Citicorp USA, Inc. as agent for the Lenders
and Issuers under the Credit Agreement defined below (the "Administrative
Agent") and Fuji Bank, Limited as syndication agent for the Lenders and Issuers
under the Credit Agreement (defined below) (the "Syndication Agent") to that
certain Credit Agreement dated as of November 19, 1999 by and among the
Borrower, the Administrative Agent, the Syndication Agent and the financial
institutions and other entities from time to time party thereto as a Lender or
Issuer (said Credit Agreement, as it may be amended or otherwise modified from
time to time, being the "Credit Agreement" and capitalized terms used herein but
not defined herein being used herein as defined in the Credit Agreement).

                                   WITNESSETH:

        WHEREAS, the Borrower, the Consenting Lenders, the Administrative Agent
and the Syndication Agent are parties to the Credit Agreement and, as of the
date hereof, the Consenting Lenders holds more than sixty-six and two-third
percent (66 2/3rd %) of the aggregate outstanding amounts of the Commitments;
and

        WHEREAS, the parties hereto wish to amend the terms of the Credit
Agreement as set forth herein;

        NOW, THEREFORE, in consideration of the foregoing, the mutual covenants
and obligations herein set forth and other good and valuable consideration, the
adequacy and receipt of which is hereby acknowledged, and in reliance upon the
representations, warranties and covenants herein contained, the parties hereto,
intending to be legally bound, hereby agree as follows:

     Section 1. Amendment to Article 5 (Financial Covenants). Article 5 of the
Agreement is hereby amended by deleting in its entirety the lead-in paragraph of
Section 5.1 (Leverage Ratio) and substituting therefor the following:

                The Borrower will maintain at the end of each Quarter during the
        years set forth below a Leverage Ratio, in each determined (x) in
        respect of Financial Covenant Debt of the Borrower, on the last day of
        such Quarter and (y) in respect of EBITDA of the Borrower, on the basis
        of the four Quarters ending on the last day of such Quarter, not in
        excess of the ratio set forth below for such Quarter:
<PAGE>

                                                                Credit Agreement
                                                      National Steel Corporation
                                                              Citicorp USA, Inc.

     Section 2. Conditions of Effectiveness. Section 1 hereof shall become
effective when, and only when, the Administrative Agent shall have received
copies of this Amendment executed by the Borrower and Lenders constituting Super
Majority Lenders.

     Section 3. Representations and Warranties. The Borrower represents and
warrants to the Administrative Agent that this Amendment has been duly
authorized, executed and delivered by the Borrower and constitutes a legal,
valid and binding obligation of the Borrower, enforceable against the Borrower
in accordance with its terms.

     Section 4. Reference to the Effect on the Loan Documents.

        (a) Upon the effectiveness of Section 1 hereof, on and after the date
hereof, each reference in the Agreement to "this Agreement," "hereunder,"
"hereof," "herein," or words of like import, and each reference in the other
Loan Documents to the Agreement, shall mean and be a reference to the Agreement
as amended hereby.

        (b) Except as specifically amended herein, the Agreement and all other
Loan Documents shall remain in full force and effect and are hereby ratified and
confirmed.

        (c) The execution, delivery and effectiveness of this Amendment shall
not, except as expressly provided herein, operate as a waiver of any right,
power or remedy of the Lenders or the Administrative Agent under any of the Loan
Documents, nor constitute a waiver of any provision of any of the Loan
Documents.

     Section 5. Execution in Counterparts. This Amendment may be executed in any
number of counterparts and by different parties hereto in separate counterparts,
each of which, when so executed and delivered, shall be deemed to be an original
and all of which taken together shall constitute but one and the same
instrument.

     Section 6. Governing Law. This Amendment shall be governed by and construed
in accordance with the law of the State of New York.

     Section 7. Headings. Section headings in this Amendment are included herein
for convenience of reference only and shall not constitute a part of this
Amendment for any other purpose.

                            [SIGNATURE PAGE FOLLOWS]

                                      -2-
<PAGE>

        IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers and general partners thereunto duly
authorized, as of the date first above written.

                                   NATIONAL STEEL CORPORATION

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   CITICORP U.S.A., INC.,
                                       as Administrative Agent

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   THE FUJI BANK, LIMITED,
                                       as Syndication Agent

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

            [SIGNATURE PAGE FOR AMENDMENT 1 TO THE CREDIT AGREEMENT]
<PAGE>

                                   CITIBANK, N.A.,
                                       as Issuer

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   Lenders:

                                   BANK OF AMERICA, N.A.

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   CITICORP USA, INC.

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   COMERICA BANK

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   MORGAN GUARANTY TRUST COMPANY OF NEW YORK

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

            [SIGNATURE PAGE FOR AMENDMENT 1 TO THE CREDIT AGREEMENT]
<PAGE>

                                   LASALLE BUSINESS CREDIT, INC.

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   MELLON BANK, N.A.

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   NATIONAL CITY COMMERCIAL
                                       FINANCE, INC.

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

                                   THE FUJI BANK, LIMITED

                                   By:
                                       -----------------------------------
                                       Name:
                                       Title:

            [SIGNATURE PAGE FOR AMENDMENT 1 TO THE CREDIT AGREEMENT]<PAGE>

                                                                     Exhibit 4-L

                                 AMENDMENT NO. 2

                                       TO

                         National Steel Credit Agreement

     AMENDMENT NO. 2, dated as of September 28, 2000 (this "Amendment No. 2"),
to the Credit Agreement, dated as of November 19, 1999, as heretofore amended
(the "Credit Agreement"), by and among NATIONAL STEEL CORPORATION (the
"Borrower"), the financial institutions party thereto as lenders and issuers
(the "Lenders and Issuers"), CITICORP USA, INC. as agent for the Lenders and
Issuers under the Credit Agreement (the "Administrative Agent") and THE FUJI
BANK, LIMITED as syndication agent for the Lenders and Issuers under the Credit
Agreement (the "Syndication Agent").

                              W I T N E S S E T H:

     WHEREAS, the Borrower has requested that the Lenders amend the Credit
Agreement as herein provided; and

     WHEREAS, Lenders constituting the Requisite Lenders have agreed to such
amendment;

     NOW, THEREFORE, in consideration of the premises and mutual covenants
contained herein, the parties hereto hereby agree as follows:

     Section 1. Amendment to Section 8.5 (Restricted Payments). Section 8.5
(Restricted Payments) is hereby amended by deleting in its entirety the text
thereof and substituting therefor the following:

          The Borrower will not, and will not permit any of its Material
     Subsidiaries to, directly or indirectly, declare, order, pay, make or set
     apart any sum for any Restricted Payment; provided, however, that any
     Material Subsidiary may make Restricted Payments to the Borrower or the
     Guarantor; provided, further, that, except during the Cash Dominion Period,
     the Borrower and its Material Subsidiaries may make other Restricted
     Payments permitted under Section 4.06 (Limitation on Restricted Payments)
     of the Indenture up to eighteen million Dollars ($18,000,000) in the
     aggregate.

     Section 2. Conditions of Effectiveness. This Amendment No. 2 shall become
effective when, and only when, the Administrative Agent shall have received
copies of this Amendment No. 2 executed by the Borrower and Lenders constituting
the Requisite Lenders.
<PAGE>

                                                                Credit Agreement
                                                      National Steel Corporation
                                                              Citicorp USA, Inc.

     Section 3. Representations and Warranties. The Borrower represents and
warrants to the Administrative Agent that this Amendment No. 2 has been duly
authorized, executed and delivered by the Borrower and constitutes a legal,
valid and binding obligation of the Borrower, enforceable against the Borrower
in accordance with its terms. After giving effect to this Amendment No. 2., each
of the representations and warranties set forth in Article IV of the Credit
Agreement is true and correct on and as of the date hereof, and no Default or
Event of Default has occurred and is continuing.

     Section 4. Reference to the Effect on the Loan Documents.

     (a) Upon the effectiveness of this Amendment No. 2, on and after the date
hereof, each reference in the Agreement to "this Agreement," "hereunder,"
"hereof," "herein," or words of like import, and each reference in the other
Loan Documents to the Agreement, shall mean and be a reference to the Agreement
as amended hereby.

     (b) Except as specifically amended herein, the Agreement and all other Loan
Documents shall remain in full force and effect and are hereby ratified and
confirmed.

     (c) The execution, delivery and effectiveness of this Amendment No. 2 shall
not, except as expressly provided herein, operate as a waiver of any right,
power or remedy of the Lenders or the Administrative Agent under any of the Loan
Documents, nor constitute a waiver of any provision of any of the Loan
Documents.

     Section 5. Execution in Counterparts. This Amendment No. 2 may be executed
in any number of counterparts and by different parties hereto in separate
counterparts, each of which, when so executed and delivered, shall be deemed to
be an original and all of which taken together shall constitute but one and the
same instrument.

     Section 6. Governing Law. This Amendment No. 2 shall be governed by and
construed in accordance with the law of the State of New York.

     Section 7. Headings. Section headings in this Amendment No. 2 are included
herein for convenience of reference only and shall not constitute a part of this
Amendment No. 2 for any other purpose.

                            [SIGNATURE PAGE FOLLOWS]

                                      -2-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers and general partners thereunto duly
authorized, as of the date first above written.

                                     NATIONAL STEEL CORPORATION

                                     By:
                                        -------------------------------
                                         Name:
                                         Title:

                                     CITICORP U.S.A., INC.,
                                         as Administrative Agent

                                     By:
                                        -------------------------------
                                         Name:
                                         Title:

                                     THE FUJI BANK, LIMITED,
                                         as Syndication Agent

                                     By:
                                        -------------------------------
                                         Name:
                                         Title:

          [SIGNATURE PAGE FOR AMENDMENT NO. 2 TO THE CREDIT AGREEMENT]
<PAGE>

                                      CITIBANK, N.A.,
                                          as Issuer

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      Lenders:

                                      BANK OF AMERICA, N.A.

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      CITICORP USA, INC.

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      COMERICA BANK

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      MORGAN GUARANTY TRUST COMPANY OF NEW YORK

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

          [SIGNATURE PAGE FOR AMENDMENT NO. 2 TO THE CREDIT AGREEMENT]
<PAGE>

                                      LASALLE BUSINESS CREDIT, INC.

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      MELLON BANK, N.A.

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      NATIONAL CITY COMMERCIAL
                                          FINANCE, INC.

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

                                      THE FUJI BANK, LIMITED

                                      By:
                                         -------------------------------
                                          Name:
                                          Title:

          [SIGNATURE PAGE FOR AMENDMENT NO. 2 TO THE CREDIT AGREEMENT]

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