AISI Type 440A is a martensitic hardenable high-carbon high chromium stainless steel recommended for cutlery, valve parts, surgical instruments, etc. It is always used in the hardened condition. 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 corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-215. Producer or source: Stainless steel mills.