Used as deoxidizers and alloy additives in the steel-making industry. In order to obtain qualified steel and chemical composition to ensure the quality of steel, steel deoxidation of final phase must, chemical affinity between oxygen and Silicon is very large, thus ferrosilicon is deoxidation steel strong reducing agent used for sedimentation and diffusion. Add a number of Silicon in steel, can significantly improve the strength, hardness, and elasticity of steel, smelting steel (SI 0.40-1.75%), tool steel (including SiO.30-1.8%), spring steel (including SiO.40-2.8%) and transformer silicon steel (Silicon-containing 2.81-4.8%), also used as an alloying agent ferrosilicon. Improve the form of inclusions reduce the gas content in molten steel, is to improve the quality of steel, effective technology to reduce cost and save with an iron. Especially suitable for deoxidation of molten steel in continuous casting requirements, practice has proved that the ferrosilicon not only meet the requirements steel deoxidation, desulfurization performance and has a large, strong penetrability and so on.