Type HU is an iron-chromium-nickel alloy containing about 60% alloying elements in the iron base. Its high chromium and nickel contents give this grade excellent resistance to corrosion by either oxidizing or reducing hot gases, particularly those containing appreciable amounts of sulfur. This excellent corrosion resistance and its excellent combination of high-temperature strength, resistance to thermal fatigue and resistance to carburization make this alloy especially suited for severe service conditions involving high stress and rapid thermal cycling. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-374. Producer or source: Various stainless steel casting companies.