What is Ferrosilicon Used For?

Release time: Jun. 15, 2024

Ferrosilicon (FeSi) is an alloy of iron and silicon with a very variable silicon content between 10% and 90%. It is used as a so-called master alloy in steel production, which is added in small amounts in order to adjust the properties of the melt, the cooling process and the finished product.


Understanding Ferrosilicon


Ferrosilicon is an iron alloy composed primarily of iron (Fe) and silicon (Si), typically containing about 15% to 90% silicon. The exact composition varies based on its intended use, with higher silicon content enhancing specific properties. It is produced by smelting quartz and iron in an electric arc furnace, where silicon dioxide and iron oxide react to produce the alloy.


Properties of Ferrosilicon


- Silicon Content: Determines the alloy's hardness, corrosion resistance, and magnetic properties.

- Density: Generally high, contributing to its weight and stability in various applications.

- Melting Point: High melting temperature, making it suitable for high-temperature applications.

- Brittleness: Varies with silicon content, affecting its machinability and formability.


What Is the Raw Material for Ferro Silicon?


Main raw materials for Ferro Silicon production are quartz, charcoal and mill scale. Quartz contains chemical gangue besides the conglomerates of surface sticking mud coat and earth materi- als which contributes for slag forming tendencies.


FeSi Production and Applications


The main advantage of FeSi is its deoxidizing effect (i.e., it reduces metals from their oxides) and its ability to prevent the loss of carbon. Additionally, ferrosilicon is utilized in electrode coatings and in the production of silicon, hydrogen, and magnesium.


Ferrosilicon is produced either in a blast furnace or electric arc furnace by reducing quartz sand (SiO2) with coke in the presence of iron. The resulting melt is poured out of the furnace and solidifies into a flat sheet.


After cooling, this sheet is crushed using appropriate machinery and further processed in a crusher. The resulting particle sizes range from fine dust-like particles to chunks several centimeters in size. FeSi is sifted into different size grades for further applications.


Applications of Ferrosilicon


Steel and Iron Production


In the steelmaking industry, ferrosilicon serves as a deoxidizer and alloying agent. It helps remove oxygen from molten steel, thereby improving steel quality and consistency. By adjusting the silicon content, manufacturers can control the steel's strength, ductility, and resistance to corrosion. Additionally, ferrosilicon enhances the magnetic properties of steel, making it valuable in electrical and transformer applications.


Ferrous Foundries


Foundries use ferrosilicon as a source of silicon for iron and steel casting. It facilitates the formation of graphite in cast iron, which influences its strength and thermal conductivity. The alloy's ability to stabilize the molten metal and control its solidification process is critical in producing precise and durable castings for automotive parts, pipes, and machinery components.


Ferrosilicon in Ferroalloys


As a component in various ferroalloys, such as ferromanganese and ferrochromium, ferrosilicon enhances the alloy's properties, including hardness, corrosion resistance, and heat resistance. These alloys find applications in aerospace, automotive, and construction industries where robust and heat-resistant materials are required.


Ferro Silicon

Other Industrial Uses


Magnesium Production


In magnesium processing, ferrosilicon acts as a reducing agent in the production of magnesium from its ores. It aids in the removal of oxygen from magnesium oxide, ensuring the purity and quality of the final metal.


Chemical Industry


The chemical industry utilizes ferrosilicon in the manufacturing of silicones, which are crucial in various chemical applications due to their heat resistance, water repellency, and electrical insulation properties.


Welding and Metal Treatment


Ferrosilicon is employed in welding electrodes and as a source of silicon in metal treatments. It improves the mechanical properties of metals, such as hardness and durability, making it suitable for diverse welding and metallurgical applications.


Environmental and Energy Applications


Nuclear Energy


In nuclear reactors, ferrosilicon plays a role in controlling nuclear reactions and shielding radiation due to its density and stability under extreme conditions.


Environmental Remediation


Ferrosilicon is used in environmental remediation projects, such as groundwater treatment and soil stabilization, where it assists in the removal of contaminants like arsenic and heavy metals.




Ferrosilicon is a versatile alloy with critical applications across numerous industries, from steelmaking and foundries to chemical production and environmental remediation. Its unique properties make it indispensable in enhancing material properties, improving manufacturing processes, and supporting technological advancements. As industries continue to innovate, the demand for ferrosilicon remains robust, driven by its essential role in modern industrial applications.


As a reputable supplier of ferrosilicon and other specialized alloys, we are dedicated to meeting the diverse needs of our clients across various sectors. Contact us to explore how our high-quality ferrosilicon products can enhance your operations and support your industrial endeavors.

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