PEERLESS-A is a low carbon, medium tungsten hot work steel which possesses excellent red hardness. It is used in those applications where the tool operates a dull red heat. It conforms to AISI Type H21, SAE Type H21. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, and machining. Filing Code: TS-85. Producer or source: Crucible Steel Company of America.