EXHIBIT 32.1 CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. 1350 (SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002) I, Michael D. Siegal, Chairman and Chief Executive Officer of Olympic Steel, Inc. (the "Company"), certify that to the best of my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended June 30, 2004, of the Company (the "Report"): (1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. By: /s/ Michael D. Siegal ---------------------------------- Michael D. Siegal Olympic Steel, Inc. Chairman & Chief Executive Officer August 13, 2004 46 OF 47