ALFA-IV alloy is a 20% Cr, 5% Al stainless steel enhanced in oxidation resistance for high-temperature use by the addition of the rare earth metals cerium and lanthanum. The alloy was designed for substrates in industrial and automotive catalytic converters. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: SS-677. Producer or source: Allegheny Ludlum Corporation.