Crucible 303 Se is a machinable austenitic stainless steel. Selenium addition is principally responsible for major characteristics. Other element control and control in manufacturing produce good consistency. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1005. Producer or source: Crucible Service Centers Divisional Headquarters.