Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 33-30545, 33-37818, 333-118030, 333-118031 and 333-154915 on Form S-8 and Registration Statement Nos. 333-87254, 333-106709 and 333-02519 on Form S-3 of our reports dated March 11, 2009, relating to the consolidated financial statements and financial statement schedule of A.M. Castle & Co. and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of A.M. Castle & Co. for the year ended December 31, 2008.

DELOITTE & TOUCHE LLP

Chicago, Illinois
March 11, 2009

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