Nitriding BM is a free-cutting grade of nitriding steel that can be surface hardened by the standards nitriding processes. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-305. Producer or source: Crucible Specialty Metals Division, Colt Industries.