Silicon manganese is also known as silicon manganese alloy. It is massive and has a silver luster. It is a composite deoxidizer often used in steelmaking. It is also a reducing agent used in the production of low-carbon ferromanganese and electro-silicothermal production of metal manganese. When steel is added to manganese iron alloy, it can be better reduced, and it can also enhance the toughness, hardness, strength, and elasticity of steel. Silicon is also an effective graphitizing medium, which can turn the carbon in cast iron into free graphitic carbon. Standard gray cast iron and ductile cast iron need to add at least 4% silicon. Most of the manganese and silicon elements are added to the molten steel in the form of ferromanganese, silicomanganese, and ferrosilicon.