NAS 255NM is a 6% Mo grade with alloying to be a very resistant stainless steel to general pitting and crevice corrosion. 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: SS-1267. Producer or source: Nippon Yakin Kogyo Company Ltd.