UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	March 25, 2020 4:00 P.M.

Form:	S-4
CIK: 0000018172 Company Name: A. M. Castle & Co. File Number: 333-236682
CIK: 0001545603 Company Name: Total Plastics, Inc. File Number: 333-236682-07
CIK: 0001545607 Company Name: Keystone Tube Company, LLC File Number: 333-236682-06
CIK: 0001803191 Company Name: Keystone Service, Inc. File Number: 333-236682-05
CIK: 0001803165 Company Name: HY-Alloy Steels Co File Number: 333-236682-04
CIK: 0001803272 Company Name: Castle Metals de Mexico, S.A. de C.V. File Number: 333-236682-03
CIK: 0001803210 Company Name: Castle Metals de Mexicali, S. A. de C. V. File Number: 333-236682-02
CIK: 0001803234 Company Name: A.M. Castle & Co. (Canada) Inc. File Number: 333-236682-01