Public domain
Steel alloy manufacture. Allegheny Ludlum Steel Corporation, Brackenridge, Pennsylvania. Refined alloy steel in the electric furnace, ready for casting into ingots. The slag layer on top of the molten steel prevents the hot steel from oxidizing, thereby preserving its high quality. Steel will be dra
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Credit lineSteel alloy manufacture. Allegheny Ludlum Steel Corporation, Brackenridge, Pennsylvania. Refined alloy steel in the electric furnace, ready for casting into ingots. The slag layer on top of the molten. 1940-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.