Main distribution and uses of silicon manganese

Silicon manganese alloy is mainly used as an intermediate of deoxidizer and alloying agent in steelmaking production, and is also the main raw material for the production of medium and low carbon ferromanganese. Silicon manganese alloy is an alloy composed of elements such as manganese, silicon, iron and a small amount of carbon. It is a widely used and large-volume ferroalloy, and its consumption ranks second among electric furnace ferroalloy products. Silicon and manganese in silicon manganese alloy have a strong affinity with oxygen. When silicon manganese alloy is used in steelmaking, the deoxidation products MnSiO3 and MnSiO4 melt at 1270℃ and 1327℃ respectively, with the advantages of low melting point, large particles, easy floating, and good deoxidation effect. Under the same conditions, the burnout rates of manganese or silicon deoxidation alone are 46% and 37% respectively, while the burnout rates of silicon manganese alloy deoxidation are both 29%. Therefore, it is widely used in steelmaking, and its output growth rate is higher than the average growth rate of ferroalloys. It has become an indispensable composite deoxidizer and alloy additive for the steel industry.

Silicon manganese alloys with a carbon content of less than 1.9% are also used to produce medium and low carbon ferromanganese and silicon hot manganese metal semi-finished products. In ferroalloy production enterprises, silicon manganese alloys used for steelmaking are usually called commercial silicon manganese alloys, silicon manganese alloys used for smelting low carbon iron are called self-use silicon manganese alloys, and silicon manganese alloys used for smelting metals are called high silicon silicon manganese alloys. Manganese and silicon can be combined to form silicides MnSiO3, MnSiO, and MnSiO3. From the silicon manganese state diagram, it can be seen that the stable silicide is MnSi. Since the negative value of the free energy of formation of manganese silicide is much greater than the negative value of the free energy of formation of manganese carbide, the higher the silicon content in the silicon manganese alloy, the lower the carbon content.