EXHIBIT 21 SUBSIDIARIES OF THE COMPANY SUBSIDIARIES OF WORTHINGTON INDUSTRIES, INC. Jurisdiction of Subsidiary (1) Incorporation WI Investments, Inc. Delaware Subsidiaries of WI Investments, Inc. Worthington Industries, Incorporated Ohio Worthington Cylinder Corporation Ohio Worthington Cylinders Ontario of Canada, Inc.(2) North American Cylinders, Inc. (2) Alabama The Worthington Steel Company Indiana The Worthington Steel Company Kentucky The Worthington Steel Company Maryland The Worthington Steel Company Michigan The Worthington Steel Company N. Carolina Worthington Steel of Michigan, Inc. Michigan I. H. Schlezinger, Inc. Ohio Buckeye Steel Castings Company Ohio B-I Sales, Inc. (3) Michigan Worthington Custom Plastics, Inc. (3) Ohio Worthington Precision Metals, Inc. (4) Tennessee Buckeye Energy Company, Inc. (3) Ohio Buckeye International Develop- ment, Inc. (3) Ohio GSI Engineering, Inc. (3) Delaware The Worthington Steel Company Pennsylvania NRM Trucking Co. (5) Delaware Worthington Ventures, Inc. (5) Delaware Joint Ventures Worthington Specialty Processing (6) Michigan London Industries, Inc. (7) Ohio TWB Company (8) Michigan Worthington Armstrong Venture (9) Delaware Acerex, S.A. de C.V. (10) Mexico * * * * * (1) All subsidiaries are wholly-owned unless otherwise indicated. Some insignificant or shell corporations are not listed. (2) Wholly-owned subsidiary of Worthington Cylinder Corporation (3) Wholly-owned subsidiary of Buckeye Steel Castings Company (4) Wholly-owned subsidiary of Worthington Custom Plastics, Inc. (5) Wholly-owned subsidiary of The Worthington Steel Company (Pennsylvania) (6) Joint Venture with USX Corp. (7) Joint Venture with Nissen Chemical Industry Co., Ltd. and Sumitomo Corporation of America (8) Joint Venture with Thyssen, Inc. (9) Joint Venture with Armstrong World Industries, Inc. (10) Joint Venture with Hylsa, S.A. de C.V.