Heppenstall 5H50 is a medium-carbon through-hardening alloy steel recommended for heavy duty service in gearing, shafting, tools and hot work dies. (ASM Tool Steel Type 6G.) This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-185. Producer or source: Midvale-Heppenstall Company.