THYROPLAST 2311 is a quenched and tempered plastic mold steel. Hardness supplied between 280-325 HB with good machineability and is capable of texturizing. This datasheet provides information on composition and physical properties. It also includes information on forming and heat treating. Filing Code: TS-525. Producer or source: Thyssen Specialty Steels Inc. See also Alloy Digest TS-514, December 1992.