6 O.S.H. Cas.(bna) 1451, 1978 O.S.H.D. (Cch) P 22,637 American Iron and Steel Institute, Jones & Laughlin Steel Corporation, National Steel Corporation, Sharon Steel Corporation, Shenango, Incorporated, United States Steel Corporation, Wheeling-Pittsburgh Steel Corporation, in Nos. 76-2358 and 76-2371, Republic Steel Corporation, in Nos. 76-2359 and 76-2372, Bethlehem Steel Corporation, in No. 76-2424, Armco Steel Corporation, in No. 76-2629, Crucible Materials Group and Colt Industries, Inc., Cyclops Corporation, Inland Steel Company, in No. 76-2630, Youngstown Sheet and Tube Company, in No. 77-1016, American Coke and Coal Chemicals Institute, in No. 77-1025, C F & I Steel Corporation, in No. 77-1088 v. Occupational Safety and Health Administration, United States Department of Labor, United States of America, United Steelworkers of America, Afl-Cio, Intervenor, 577 F.2d 825