ARMCO 12 SR was developed specifically for automotive exhaust applications. It has greater oxidation resistance than AISI Type 409 and it exhibits formability and weldability comparable to more highly alloyed ferritic grades. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-424. Producer or source: Armco Inc., Eastern Steel Division. Originally published April 1983, revised February 1986.