Ferrosilicon, also known as ferrosilicon alloy. It is an alloy composed of silicon and iron in a certain proportion. Due to the different silicon content, the commonly used grades of ferrosilicon are: ferrosilicon 65, ferrosilicon 70, ferrosilicon 72, ferrosilicon 75.
Ferrosilicon is used as a source of silicon to reduce metals from their oxides and to deoxidize steel and other ferrous alloys. This prevents the loss of carbon from the molten steel ferromanganese, spiegeleisen, calcium silicides, and many other materials are used for the same purpose.[5] It can be used to make other ferroalloys. Ferrosilicon is also used for manufacture of silicon, corrosion-resistant and high-temperature-resistant ferrous silicon alloys, and silicon steel for electromotors and transformer cores. In the manufacture of cast iron, ferrosilicon is used for inoculation of the iron to accelerate graphitization. In arc welding, ferrosilicon can be found in some electrode coatings.
Ferrosilicon is a basis for manufacture of prealloys like magnesium ferrosilicon (MgFeSi), used for production of ductile iron.Ferrosilicon is also important as an additive to cast irons for controlling the initial content of silicon.