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The characteristic of Mg powder is It is flammable and explosive,and brings high temperature and glaring light when burning.Therefore,Mg powder is wisely used in such scientific area as war industry and aviation industry. The chemical performance of Mg is very active,which is mostly used in metallurgical industry.Mg powder can sever as desulfurizer or cleaning agent for steel-making industry and casting of non-ferrous metals,and reducer for production of rare metal. In chemical industry,Mg powder can be used as dehydrant for organic compound or to directly make organic compound of Mg.In recent years,Mg powder has been mostly used in spaying,coatingantti-corrosion,monocrystalline silicon,polycrystalline silicon ,and cating of metallurgical powder as well . Passivation spherical Mg powder It used for desulfuration and deoxidation in production of fine steel, bringing the sulfur element of fine steel to be less that 0.04%.As a dehydrant ,it is not replaceable to improve fine steel quality.exploition,In production of ductile castiron,it can be a nodulizer in place of middle alloy amony iron-silicon-Mg.For oil it can resume or accelerate the speed of the pressure drilling hole and oil well.Passivated spherical Mg powder is an effective dehydrant and incendiary agent for chemical and war industry.Besides used as a Mg alloy powder,It is also a kind of metallurgical materials.