Select B FM is a high carbon-medium chromium fully uniform air hardening die steel. It possesses excellent non-deforming properties, is deep hardening and has the balance of toughness and wear resistance required for difficult applications. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: TS-108. Producer or source: Latrobe Steel Company.