C. Y. W. CHOICE steel is a chromium hot work steel developed for applications where dies or tools are subjected to heavy pressure or impact while in contact with hot metal. It is an ASM Class IV A-2 tool steel. This datasheet provides information on composition, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, and machining. Filing Code: TS-43. Producer or source: Firth Sterling Corporation.