Vulcan-Kidd 4870 is a fine grained, deep hardening, water quenching steel with very shock resistance and good wear resistance. It is a tough cold working tool steel. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: TS-118. Producer or source: H. K. Porter Company Inc..