AISI C1141 is a tough, carbon-manganese steel characterized by its free-machining qualities. It is especially recommended for high production automatic machine products. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: CS-13. Producer or source: Carbon and alloy steel mills.