Marker (or Märker) Alloy 31 is a highly alloyed austenitic stainless steel casting with excellent corrosion resistance to solutions of salts containing chlorides, fluorides, sulfites, or sulfates. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-1011. Producer or source: Schmidt & Clemens Inc.