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It is used as a deoxidizer and an alloying agent in the steelmaking industry.
As a steelmaking deoxidizer, the most widely used are silicon manganese, ferromanganese and ferrosilicon. Strong deoxidizers are aluminum (aluminum iron), silicon calcium, silicon zirconium, etc. (see the deoxidation reaction of steel). Common varieties used as alloy additives are: ferromanganese, ferrochromium, ferrosilicon, ferrotungsten, ferromolybdenum, ferrovanadium, ferrotitanium, ferronickel, niobium (tantalum) ferrous, rare earth ferroalloys, ferroboron, ferrophosphorus.
In order to obtain steel with qualified chemical composition and ensure the quality of steel, deoxidation must be carried out in the final stage of steelmaking. The chemical affinity between silicon and oxygen is very large, so ferrosilicon is a strong deoxidizer in steelmaking for precipitation and diffusion. deoxidation. At the same time, it can improve the shape of inclusions and reduce the content of gas passing elements in molten steel. It is an effective new technology to improve steel quality, reduce enterprise costs and save iron. Studies have shown that ferrosilicon can not only meet the requirements of steelmaking deoxidization capacity of enterprises, but also has the advantages of desulfurization technology and has the advantages of large specific gravity and strong penetrating power.

It is used as iron inoculant and spheroidizing agent in cast iron.
Cast iron is an important metal structural material in the industrial development of modern enterprises. It is cheaper than steel, easy to melt and smelt, and has excellent casting technical performance and shock resistance. Adding a certain amount of ferrosilicon to cast iron can prevent carbides in the process of iron formation and promote the precipitation and spheroidization of graphite. Therefore, in the production of ductile iron, ferrosilicon is an important inoculant and spheroidizing agent.

It is used as a reducing agent in the production of ferroalloys.
Great chemical affinity between not only silicon and oxygen, high carbon content and low silicon ferrosilicon. Therefore, siliceous alloy is a commonly used reducing agent for iron alloys in the production of low-carbon iron alloys in industry.