AISI Type M30 is a high-speed tool steel containing 8% molybdenum and 5% cobalt. It provides long life in machining difficult-to-cut metals, such as heat-resisting alloys and superalloys, and is recommended for cutting tools requiring a good combination of suitable toughness with optimum cutting qualities. This datasheet provides information on composition and hardness as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-247. Producer or source: Tool steel mills.