Olympic Steel (ZEUS) 10-Q 2018 Q1 Quarterly report

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, the Chairman & Chief Executive Officer of Olympic Steel, Inc. (the "Company"), certify that to the best of my knowledge, based upon a review of this report on Form 10-Q for the period ended March 31, 2018 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, as of the dates and for the periods expressed in this Report.

By: /s/ Michael D. Siegal

Michael D. Siegal
Olympic Steel, Inc.
Chairman & Chief Executive Officer

May 3, 2018