Silicon-manganese alloy is an alloy composed of manganese, silicon, iron and a small amount of carbon, which is a widely used and high-yield ferroalloy. Its consumption accounts for the second place in electric furnace ferroalloy products. Manganese and silicon in Mn-Si alloy have strong affinity with oxygen. When Mn-Si alloy is used in steelmaking, the melting points of deoxidized products MnSiO3 and Mn2SiO4 are 1270℃ and 1327℃ respectively, which have the advantages of low melting point, large particles, easy floating and good deoxidization effect. Under the same conditions, the burning loss rate of manganese or silicon alone is 46% and 37%, respectively, while the burning loss rate of manganese-silicon alloy is 29%.
All industrial steels need to add a small amount of manganese as desulfurizer, so that the steel can be hot rolled and forged without breaking. Manganese is also the most important alloying element in various steels. More than 15% manganese will be added to alloy steel to increase the structural strength of steel. Silicon is the most important alloying element in pig iron and carbon steel after manganese. In iron and steel production, silicon is mainly used as deoxidizer of molten metal, or as alloy additive to increase the strength of steel and improve its properties. Silicon is also an effective graphitization medium, which can transform carbon in cast iron into free graphitic carbon.