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U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 183) 6. Laid out linearly from north to south, the seven chamber roller type unit operated on 209 kilowatts and was used to harden and temper bars up to 25' long from 3/8" to 8 1/4" in diameter. The entire installation is 3 66' long. It consists of a motor powered entry table; a preheating, intermediate, and high temperature heating furnace, each 29' long x 4 , -6" wide x 7'-3" high; a 29' long x 4'-6" wide x 10' deep oil or water quench tank serviced by a quench table suspended from the quench drive platform by means of cable, pulley, and drum arrangements; a 29* long x 5'-6" wide x 7'-3" high strain relief furnace; a transfer table and cradle; a preheating, intermediate, and high temperature tempering furnace, each 29' long x 5 f -6" wide x 7'-3" high; and a motor powered run-out table with cradle. Installation date: 1943. D. Car Bottom Furnace No. 2: Manufactured by the Gas Machinery Company of America, this furnace is located about 20' west of the Continuous Electric Heat Treating Line. It is of the same approximate dimensions and serves the same purpose as Car Bottom Furnace No. 6. Installation date: 1943. E. Car Bottom Furnace No. 3: Located about 20' west of Car Bottom Furnace No. 2, this furnace was built by the same manufacturer to the same approximate dimensions and for the same purpose as Car Bottom Furnace No. 6. Installation date: 1943. F. Car Bottom Furnace No. 4: Located about 40' west of Car Bottom Furnace No. 3, this furnace fits the general description of Car Bottom Furnace No. 1. Installation date: 1943. G. Car Bottom Furnace No. 5: Located approximately 10' west of Car Bottom Furnace No. 4, this furnace fits the general description of Car Bottom Furnace No. 1. Installation date: 1943. H. Continuous Gas-Fired Heat Treating Line: Manufactured by Salem Brosius Inc., the Continuous Gas-Fired Heat Treating Line is located approximately 15* west of Car Bottom Furnace No. 5. Laid out linearly from north to south, the four chamber roller type furnaces were used to harden and temper bars up to 9 * in diameter and 40' long. The line consists of a motor powered entry table, a 47*-10" long x 10*-5" wide x 8' high heating furnace; a holding furnace of the same dimensions as above; a 46*-6" long x 12'-3" wide x 14'-2" deep water quench tank serviced by a quench table suspended from the quench drive platform by means of cable, pulley, and drum arrangements; a
U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 184) intermediate transfer table and cradle; a draw furnace of the same dimensions as the heating and holding furnace; a draw- holding furnace of the same dimensions as above; and a run-out table with cradle. Installation date: 1962. I. Ajax Mangnethermic Induction Line: Manufactured by Ajax Inc., the mangnethermic induction line was also used to harden and temper bars. Laid out on a straight line from north to south, the equipment making up the line consists of a load table; a motor-driven chain conveyor which transfers bars from the load table to a roller type in-feed conveyor line which is located just west of the load table; four electric heating coils; a ring type spray quenching facility complete with guide rollers for holding the product to be heated and quenched; and a roller type discharge table onto which are attached cradles from which the finished bars are picked up and transferred to the finishing and testing equipment by an E.O.T. crane. Installation date: 1962. J. Finishing and Testing Equipment: Located within the heat treatment plant building are a number of pieces of equipment used for finishing and testing bars. These include gag presses, bar straighteners, hack saws, abrasive cut-off machines, bar turners, centerless grinders, hardness testers, and a 25-ton scale. The following gives the general location and manufacturer (when possible) of the equipment within the building: 1. Gag Presses: There are a total of two hydraulic gag presses in the building. Laid out on a north-south axis, gag press No. 1 is located 59' west of the continuous electric heat treating line's tempering furnaces. Gag press No. 2, also laid out on a north-south axis, is located approximately 45' south of the continuous gas fired heat treating line. Both presses consist of an entry table, a gag press station, and a delivery table. Each gag press is approximately 100' long. Installation dates: 1943 and 1962. 2. Bar Straighteners: The building contains four two roll bar straighteners manufactured by Medart Inc. Bar straightener No. 1 is located 20* east of gag press No. 1 and is laid out on a north-south axis. Bar straightener No. 2, also laid out on a north-south axis is located 20* east of bar straightener no. 1. Bar straightener no. 3 is located 56' from the western wall of the transfer bay and is laid out on a north-south axis. Bar Straightener no. 4, laid out on a south-north axis, is located 82■ from the eastern wall of the production bays in the southern end of the building. Each straightener is approximately 85' long and consists of an entry table, two roll station, and a delivery
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