IN-861 is a mixed elemental powder metallurgy steel designed for use in the as-sintered condition. It achieves its good mechanical properties by hardening during normal cooling in most commercial sintering furnaces. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on heat treating, machining, and powder metal forms. Filing Code: SA-308. Producer or source: International Nickel Company Inc..