Carpenter Custom 455 is a low-carbon martensitic stainless steel that responds to precipitation-hardening. The single aging treatment produces exceptionally high yield strength with good ductility and toughness. It is suitable for applications requiring high strength and corrosion resistance at temperatures up to 800 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-193. Producer or source: Carpenter.