BETHLEHEM 57HW is the 9% tungsten type of hot-work tool steel, having excellent red-hardness and abrasion resistance compared with relatively good shock resistance for high operating temperatures. It corresponds to AISI Type H21 hot work tool steel. This datasheet provides information on composition, 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-84. Producer or source: Bethlehem Steel Corporation.