Manganese and silicon is carbon steel used in the main alloy elements. Manganese is one of the most main deoxidizer in steelmaking process, almost all types of steel need to DNA by manganese. Because when deoxidization with manganese to generated oxygen product melting point is lower, easy to rise; Manganese can also increases the size of silicon and aluminum deoxidizer deoxidization effect. All that need to be to join a small amount of manganese steel capital as the desulfurizer, can make the steel for hot rolling, forging and other process without fracture, manganese is the most important alloy element in steel, will add more than 15% of manganese in alloy steel in order to increase the strength of the steel structure. Silicon is the second only to manganese iron and carbon steel alloy elements of the most important. In steel production, silicon is used primarily as a molten metal deoxidizer, or as alloy additives to increase the intensity of steel and to improve its performance. Silicon is an effective storage medium, it can make carbon into free storage of carbon in cast iron. Join the standard silicon of gray iron and nodular cast iron can reach 4%. And a large number of manganese and silicon is added to the molten steel in the form of ferroalloy: in ferromanganese, silicon manganese and silicon.