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Ferrosilicon, or ferrosilicium, is a ferroalloy an alloy of iron and silicon with between 15 and 90% silicon. It contains a high proportion of iron silicides. Its melting point is about 1200 °C to 1250 °C with a boiling point of 2355 °C. It also contains about 1 to 2% of calcium and aluminium.
Ferrosilicon is used in steelmaking and foundries as a source of silicon in production of carbon steels, stainless steels, and other ferrous alloys for its deoxidizing properties, to prevent loss of carbon from the molten steel (so called blocking the heat); ferromanganese, spiegeleisen, silicides of calcium, and many other materials are used for the same purpose. 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 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.

18/04/2009 2000 2000 2000
29/01/2009 1300-1500 1697.55 1697.55
16/12/2008 1255-1375 1300-1400 1300-1400
30/10/2008 2910.09 2832.93 2755.77
30/04/2008 1570 2161 2161
30/03/2008 2095 2095 2095
28/02/2008 1841 1841 1841
30/01/2008 1180 1200 1720
30/12/2007 1433 1510 1587

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