JOSLYN STAINLESS Type 305 MH is a non-hardenable austenitic corrosion resistant steel especially designed for difficult cold heating or cold forging. 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-198. Producer or source: Joslyn Stainless Steels.