CPM REX 45 is an 8% cobalt high-speed steel which has excellent hot hardness along with good wear resistance and toughness, making it suitable for difficult machining applications. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity as well as fracture toughness. It also includes information on wear resistance as well as forming and heat treating. Filing Code: TS-534. Producer or source: Crucible Materials Corporation.