NAS 660 is a Ni-Cr stainless steel alloy with excellent heat resistance. The alloy is used for its high strength at high temperatures. The alloy is a precipitation-hardening material. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming and heat treating. Filing Code: SS-1189. Producer or source: Nippon Yakin Kogyo Company Ltd.