Exhibit 99-A

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
           PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

         The undersigned, being the Chief Executive Officer of National Steel
Corporation (the "Company"), hereby certifies pursuant to 18 U.S.C. (S) 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the
best of his knowledge:

         (1) The Company's Form 10-Q for the quarterly period ended September
         30, 2002 (the "Report") fully complies with the requirements of Section
         13(a) or 15(d) of the Securities and Exchange Act of 1934; and

         (2) The information contained in the Report fairly presents, in all
         material respects, the financial condition and results of operation of
         the Company.

         Executed as of this 14th day of November 2002.

                                   /s/  Mineo Shimura
                               -------------------------------------------------
                               Mineo Shimura
                               Chairman of the Board and Chief Executive Officer

This Certification accompanies the Report pursuant to (S) 906 of the
Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the
Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of (S)
18 of the Securities Exchange Act of 1934, as amended.