Thyroplast 2311 tool steel is an AISI P20 modified grade, electric are melted and vacuum degassed, applicable to large plastic molds. It has good abrasion resistance and high impact strength This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-514. Producer or source: Thyssen Specialty Steels Inc.. See also Alloy Digest TS-525, April 1994.