CAS - EX 23.1 - 12.31.12

We consent to the incorporation by reference in Registration Statement No. 333-154915, 333-160942 and 333-174174 on Form S-8 and Registration Statement Nos. 333-87254, 333-106709, 333-02519 and 333-142337 on Form S-3 of our reports dated March 11, 2013, relating to the consolidated financial statements 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, 2012.