AISI TYPE 414 is a martensitic type stainless steel of intermediate hardness. It offers combined corrosion and heat resisting properties with high strength and toughness. This datasheet provides information on composition, physical properties, hardness, 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, and joining. Filing Code: SS-103. Producer or source: Stainless steel mills. Originally published May 1960, revised February 1989.