HALCOMB 218 is a tough hot work steel suitable for tools requiring a higher degree of toughness at moderately elevated temperatures than is obtainable in the tungsten types of hot work steel. It is similar to ASM Type IV-B and AISI H-11. 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-51. Producer or source: Crucible Steel Company of America.