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Subsidiary

Jurisdiction of Incorporation

Ownership

A.M. Castle & Co. (Canada) Inc.

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British Columbia

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100%

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A.M. Castle & Co. (Singapore) Pte. Ltd.

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Singapore

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100%

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A.M. Castle Metal Materials (Chengdu) Co., Ltd.

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Peoples Republic of China

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100%

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A.M. Castle Metal Materials (Shanghai) Co., Ltd.

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Peoples Republic of China

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100%

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A.M. Castle Metals UK Limited

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United Kingdom

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100%

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Castle Metals de Mexicali, S.A. de C.V.

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Mexico

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100%

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Castle Metals de Mexico, S.A. de C.V.

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Mexico

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100%

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Castle Metals France S.A.S.

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France

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100%

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Castle Metals UK Limited

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United Kingdom

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100%

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HY-Alloy Steels Company

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Delaware

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100%

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Keystone Service Inc.

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Indiana

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100%

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Keystone Tube Company, LLC

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Delaware

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100%

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Total Plastics, Inc.

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Michigan

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100%