Reduced iron from the iron oxide is generally under high heat conditions to restore the flow of hydrogen or carbon monoxide is generated in the gas stream, the main component of loose structure of elemental iron. Since the reduced iron powder itself, and the microstructure is loose coupled, so the maximum surface area. In chemical production and laboratory operations commonly used for high-reducing agent. The main purposes are: reduced iron is mainly used in chemical catalysts, precious metal restore, adding alloy, copper, such as replacement. Reduced iron powder used for cutting stainless steel iron, steel products during cutting, the oxygen - acetylene flame spray iron, can improve the cutting performance, cutting steel to expand the scope to improve the thickness can be cut. In short iron reduction in a wide range of usefulness of the current society.