CIRCLE L 21 is a columbium type 18-8 stainless steel casting alloy recommended for welded structures and equipment in the chemical industries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on low and high temperature performance, and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-160. Producer or source: Lebanon Steel Foundry.