Type CH-20 is a 25-12 type of heat and corrosion resisting cast alloy steel. It is recommended for equipment in the chemical, processing, power plant and paper and pulp industries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-239. Producer or source: Stainless steel foundries.