VDC-RF hot work die steel is an improved version of H13 by melting practice. See also VDC Hot Work (Type H13), Alloy Digest TS-45, April 1956. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on heat treating and machining. Filing Code: TS-735. Producer or source: Latrobe Specialty Steel Company.