Exhibit

We consent to the incorporation by reference in Registration Statement No. 333-221785 on Form S-1 and Registration Statement No. 333-221787 on Form S-8 of our report dated March 14, 2018, relating to the consolidated financial statements and financial statement schedules of A.M. Castle & Co. and subsidiaries (the “Company”) (which report expresses an unqualified opinion and includes an explanatory paragraph related to the Company’s emergence from bankruptcy), appearing in this Annual Report on Form 10-K of A.M. Castle & Co. for the year ended December 31, 2017.