The role of ferrosilicon in steel-making and casting

Ferrosilicon is a widely used ferroalloy variety. It is a ferrosilicon alloy composed of silicon and iron in a certain proportion, and is an indispensable material for steelmaking, such as FeSi75, FeSi65, and FeSi45.

Status: natural block, off-white, with a thickness of about 100mm. (Whether there are cracks in the appearance, whether the color fades when touched by hand, whether the knocking sound is crisp)

Composition of raw materials: Ferrosilicon is made by smelting coke, steel shavings (iron oxide scale), and quartz (or silica) in an electric furnace.

Commonly used grades: Ferrosilicon 75

Why is it said that ferrosilicon is essential in steel-making?

Due to the strong affinity between silicon and oxygen, after ferrosilicon is added to steelmaking, the following deoxidation reaction occurs:

Silica is the product of deoxidation, it is lighter than molten steel, floats on the surface of steel and enters the slag, thereby taking off the oxygen in the steel, which can significantly improve the strength, hardness and elasticity of the steel, increase the magnetic permeability of the steel, and reduce the temperature of the transformer. Hysteresis loss of steel.

What are the other uses of ferrosilicon?

1. Used as an inoculant and nodulizer in the cast iron industry;
2. Add ferrosilicon as reducing agent when smelting some ferroalloy products;
3. Due to the important physical properties of silicon, such as low electrical conductivity, poor thermal conductivity and strong magnetic conductivity, ferrosilicon is also used as an alloying agent in silicon steelmaking.
4. Ferrosilicon is often used in the high-temperature smelting process of metal magnesium in the Pidgeon process of magnesium smelting
5. Use in other ways. Finely ground or atomized ferrosilicon powder can be used as a suspension phase in the mineral processing industry. In the welding rod manufacturing industry, it can be used as a coating for welding rods. High-silicon ferrosilicon can be used in the chemical industry to make products such as silicone.


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