Firstly, it is used as deoxidizer and alloying agent in steelmaking industry. In order to obtain steel with qualified chemical composition and ensure the quality of steel, deoxidation must be carried out at the end of steelmaking. The chemical affinity between silicon and oxygen is very large. Therefore, ferrosilicon is a strong deoxidizer for steelmaking, which is used for precipitation and diffusion deoxidation. Adding a certain amount of silicon to the steel can significantly improve the strength, hardness and elasticity of the steel.
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Therefore, ferrosilicon is also used as an alloying agent when smelting structural steel (containing silicon 0.40-1.75%), tool steel (containing silicon 0.30-1.8%), spring steel (containing silicon 0.40-2.8%) and silicon steel for transformer (containing silicon 2.81-4.8%).
In addition, in the steel-making industry, ferrosilicon powder can release a large amount of heat under high temperature. It is often used as the heating agent of ingot cap to improve the quality and recovery of ingot.
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