ALLEGHENY LUDLUM TYPE 439 is a stainless steel with a high resistance to chloride stress-corrosion cracking. It also has a high level of general resistance in steam and fresh-water environments. Its high level of chromium provides resistance to sulfidation and oxidation. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-470. Producer or source: Allegheny Ludlum Corporation.