ALLEGHENY LUDLUM 204 and 204L are austenitic chromium-nickel-manganese stainless steels comparable in properties to Type 304 and 304L stainless steels. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-97. Producer or source: Allegheny Ludlum Corporation.