Micro-Melt M48 alloy is a superhigh-speed tool steel with a high alloy content and capable of achieving a hardness of 70 HRC. The alloy is used in various tooling and die inserts. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming and heat treating. Filing Code: TS-622. Producer or source: Carpenter Specialty Alloys.