Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
Reliance Steel & Aluminum Co. Master 401(k) Plan
Los Angeles, California
We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (File No. 333-147226) of Reliance Steel & Aluminum Co. of our report dated June 17, 2021, relating to the financial statements and supplemental schedules of the Reliance Steel & Aluminum Co. Master 401(k) Plan which appear in this Form 11-K for the year ended December 31, 2020.
/s/ BDO USA, LLP
Los Angeles, California
June 17, 2021