GRAPH-AIR is an air hardening, non-deforming tool steel with outstanding wear resistance and toughness. it contain uniformly distributed graphic particles for good machinability and non-seizing characteristics. This datasheet provides information on composition, hardness, tensile properties, and compressive strength as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-75. Producer or source: Latrobe Steel Company. Originally published October 1958, revised April 1984, June 1991.