Allegheny Ludlum Type 303 stainless steel is a free-machining austenitic stainless steel, which retains almost all of the basic 18 chromium-8 nickel stainless steel properties. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: SS-794. Producer or source: Allegheny Ludlum Corporation.