Ferrosilicon is an alloy of iron and silicon. It is produced by smelting a mixture of iron ore, quartz, and coke in an electric arc furnace. The silicon content in ferrosilicon can range from 15% to 90%.

Ferrosilicon is used as an alloying agent in the production of steel. It is added to steel to improve its strength, hardness, and toughness. Ferrosilicon also helps to deoxidize steel and remove impurities.

In addition to its use in the production of steel, ferrosilicon is also used in the production of cast iron, non-ferrous metals, and chemicals.

Here are some of the properties of ferrosilicon:

* Melting point: 1200-1450°C (2192-2642°F)

* Density: 6.7-6.9 g/cm³ (0.24-0.25 lb/in³)

* Hardness: 6-7 on the Mohs scale

* Electrical resistivity: 0.4-1.0 μΩ·cm (4-10 μΩ·in)

* Thermal conductivity: 25-35 W/m·K (6-8 BTU/in·ft²·°F)

Ferrosilicon is a valuable alloying material with a wide range of applications. It is an important component in the production of steel and other metals.