Crucible CPM REX M35HCHS is a modification of the AISI M2 high-speed steel by an addition of cobalt and produced by powder metallurgy to be homogeneous with good toughness. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity. It also includes information on forming and machining. Filing Code: TS-595. Producer or source: Crucible.