DURIMET 20 is a special austenitic stainless steel alloy of nickel, chromium, molybdenum, and copper. It is highly resistant to hot and cold strong acids and is supplied in the form of castings to the grade CN7M. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: SS-5. Producer or source: The Duriron Company Inc. Originally published January 1953, revised March 1962, March 1996.