Manganese and silicon are the main alloying elements used in carbon steel. Manganese is one of the most important deoxidizer in steelmaking process. Almost all kinds of steel need to be deoxidized by manganese. Manganese can also increase the deoxidization efficiency of strong deoxidants such as silicon and aluminum. All industrial steels are required to add a small amount of manganese as a desulfurizer, so that the steel can be hot-rolled, forged and other processes without fracture, manganese is the most important alloy element of all steels, in alloy steel will also be added more than 15% manganese to increase the structural strength of steel. Silicon is the most important alloy element in pig iron and carbon steel after manganese. In steel production, silicon is mainly used as deoxidizer for molten metal or as alloy additive to increase strength and improve properties of steel. Silicon is also an effective medium for grinding. It can make carbon in cast iron become free carbide. The silicon content in standard grey cast iron and ductile iron can reach 4%. A large number of manganese and silicon are added into the molten iron in the form of ferroalloys: Ferromanganese, silicon manganese and ferrosilicon.
Manganese-silicon alloy is produced from manganese ore, manganese-rich slag, silica, coke, dolomite (or limestone), fluorite. The production of Mn Si alloy can be carried out with a mixture of manganese ore or manganese ore (including manganese rich slag). Because manganese-silicon alloy requires lower iron and phosphorus content than high carbon ferromanganese, manganese ore smelting manganese-silicon alloy is required to have higher manganese-iron ratio and manganese-phosphorus ratio. The higher the manganese content in the manganese ore, the better the indicators.