Abstract HALGRAPH is an electric furnace melted, oil hardening, graphitic tool steel with excellent non-deforming properties. It is free-machining and has a high resistance to wear. It is non-deforming type steel suitable for use as tools, dies, gauges and parts requiring maximum hardness and freedom from distortion. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-165. Producer or source: Crucible Steel Company of America.