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Join this channel to get access to perks: Want to learn more about Perisope Film and get access to exclusive swag? Join us on Patreon. Visit Visit our website This color film titled “Steel Horizons” was likely made in the late 1940s or 1950s and tells the story of how steel, specifically stainless steel, is manufactured. Produced by Mode Art Picture Productions and presented by Allegheny Ludlum Steel Corporation, this 20-minute film likely acted as promotional marketing material at the time. The film is composed of various scenes and shots of steel at different stages of production from ingot to slab to coil while voice-over narration offers more details and insights into the intricacies of producing stainless steel. Today, Allegheny Ludlum Steel Corporation is known as Allegheny Technologies Incorporated (ATI) and is headquartered in Pittsburgh, Pennsylvania however has plants across the United States. This film was likely filmed at one of the company's original mills in western Pennsylvania. Various scenes from the steel mill (0:47). Employee standing beside 75 ton electric furnace (1:24). Close-up of molten steel in ladle (1:39). Teaming process (1:46). Steel ingot circular soaking pits (2:08). Close-up of the interior of the soaking pit (2:24). Steps leading to reduction of one of these ingots into slabs (2:32). 40 inch blooming mill being operated by operators compressing the ingot into a slab (2:52-3:46). Motor room where machinery of mill is housed (3:47). Newly formed slab receiving its edging pass (4:18). Sink head or end of the slab is cropped off by the shear (4:28). Slab at first roughing stand of the breakdown mill (4:47). Steel slab going through elongation process (4:51). Slab passing through a stand or upright casting (5:10). Slab’s gauge is reduced by vertical edging rolls (5:16). Panning shot of finishing part of the mill (5:36). Steel in the automatic feed coiler (5:58). Steel marked with identification melt number, size, and type (6:22). Steel coil is annealed in a furnace to make stainless steel (6:31). Steel emerges and undergoes water spray treatment (6:55). Process of removing unwanted scale on steel’s surface - annealed coils immersed in hot salt bath before immersion in sulfuric acid and finally immersion in nitric hydrofluoric acid (7:22-7:28). Close up of nitric hydrofluoric acid interacting with steel (7:39-8:40). Coils emerging from the bath as stainless steel (8:42). Gauge and finish of the coil is further refined, fed through roller leveler (8:59). Worker standing at the cold rolling mill at four high reversing mill (9:25). Close-up of General Electric dust panel that controls mill operations (9:53). Panning shots of reversing mill apparatus and employees at work (10:14-11:34). Final pass where paper is fed into the coil of strip (11:35). Steel is annealed once more (12:12). Close-up of steel in a furnace (12:27). Animated diagram of annealing and pickling process (12:33-13:10). Steel coming out of take-up reel (13:12). Comparison of steel at early and late stages of production (13:28). Steel coils stored in warehouse (13:38). Mesta Machinery in four stand four high tandem mill (13:53). Process of steel passing through the four stands (14:04-15:30). Animated diagram of annealing and pickling process once again (15:33). Another side-by-side comparison to compare thickness (15:50). Steel is adjusted to customer specifications (16:14). Allegheny Ludlum Steel Corporation production seal (16:32). Another part of the mill that specializes in cold rolling (16:38). Large planishing mill (17:12). Final product of stainless steel with mirror-like surface (17:43). Stainless steel being cut down to narrower widths (18:04). Finished steel coils in a warehouse ready to be shipped to customers (18:35). Allegheny Ludlum Corporation remains in business today. It is one of the largest manufacturers of specialty steel and other specialty metals in the United States. Stainless steel, by far the principal product line of Allegheny Ludlum, accounts for about 80 percent of its total sales and ranks it among the three largest manufacturers of the specialty metal. We encourage viewers to add comments and, especially, to provide additional information about our videos by adding a comment! See something interesting? Tell people what it is and what they can see by writing something for example: “01:00:12:00 -- President Roosevelt is seen meeting with Winston Churchill at the Quebec Conference.“ This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit
