Iron alloy is also used to produce other metal thermal reduction reducing ferroalloys and nonferrous metals, alloys of non-ferrous alloy additive; also a small amount for the chemical industry and other industries; steelmaking: a calcium alloy steels are iron alloys all meal prices, which also makes alloy is the most widely used, the largest amount of alloy. Ferroalloys: ferroalloys production methods by device points. Blast furnace, submerged arc furnace method calcium alloy powder production plant, electric arc furnace method, outside the furnace, vacuum resistance furnace, oxygen converter method. Divided by technological features: solvent-free and solvent. Press the heat source of: carbon thermal method, heating method, silicon thermal power, metal calorimetry.