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What Is Ferrosilicon?​​

Oct 16, 2025

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What Is Ferrosilicon?​​

 

 

Ferrosilicon (FeSi)​​ is a ​​ferroalloy of iron (Fe) and silicon (Si)​​, primarily used in ​​steelmaking, foundry applications, and deoxidation​​. It is produced by ​​reducing silicon dioxide (SiO₂) with carbon (coke) in an electric arc furnace​​.

​​Key Properties of Ferrosilicon:​​

​​Property​​
​​Description​​
​​Significance​​
​​Chemical Composition​​
​​Si (15–90%), Fe (balance), C, Al, Ca (traces)​​
Higher Si content (e.g., FeSi 75) is more reactive.
​​Physical Form​​
​​Lumps, grits, or powder (granulated)​​
Affects handling and application (e.g., inoculants vs. deoxidizers).
​​Density​​
​​~2.8–3.5 g/cm³​​
Influences mixing in molten steel.
​​Melting Point​​
​​~1200–1300°C (depends on Si content)​​
Must withstand steelmaking temperatures.
​​Function​​
​​Deoxidizer, alloying agent, inoculant​​
Essential for steel quality and casting.

​​Types of Ferrosilicon (Based on Si Content):​​

​​FeSi 45 (45% Si)​​ – General-purpose deoxidizer.
​​FeSi 75 (75% Si)​​ – Most widely used (better alloying).
​​FeSi 90 (90% Si)​​ – High-purity, used in special steels.
Ferrosilicon is ​​non-toxic but reactive with water (produces hydrogen gas)​​, requiring careful storage.

 

Visit ferro-silicon-alloy.com to learn more about the product. If you would like to know more about the product price or are interested in purchasing, please send an email to info@zaferroalloy.com. We will get back to you as soon as we see your message.

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