Essential Properties Of High Carbon Silicon

The main components of high carbon silicon are silicon and carbon, and it also contains a small amount of impurities such as iron, aluminum, and calcium. Its production usually adopts the smelting method of submerged arc furnace, with silica (SiO₂) and carbonaceous reducing agent (such as coke, petroleum coke) as the main raw materials, and the reduction reaction is carried out at high temperature (1800-2000℃). Due to the high affinity of silicon for oxygen, the atmosphere in the furnace needs to be strictly controlled during the smelting process to reduce oxidation losses. In addition, the purity and ratio of the raw materials have a direct impact on the carbon content of the final product, so the product composition needs to be optimized by adjusting the carbon ratio.

High carbon silicon is mainly used as a deoxidizer and alloy additive in the steel industry. In the steelmaking process, the presence of oxygen will reduce the mechanical properties of steel, while silicon has a strong deoxidation ability and can combine with oxygen in the molten steel to generate SiO₂, thereby reducing pores and inclusions in the steel. Compared with ordinary ferrosilicon, high carbon silicon contains a higher carbon content and can add carbon to the molten steel while deoxidizing, making it suitable for smelting medium and high carbon steel. In addition, high carbon silicon can also improve the hardness, strength and wear resistance of steel, so it has advantages in the manufacture of special steels such as wear-resistant castings and spring steel.

In cast iron production, high carbon silicon is often used for inoculation treatment and silicon and carbon addition. The mechanical properties of cast iron are greatly affected by the graphite morphology, and silicon can promote graphitization, improve the toughness and cutting performance of cast iron. Due to its high carbon content, high carbon silicon can adjust the carbon equivalent of molten iron at the same time, reduce the use of other carburizers (such as pig iron and coke), and thus reduce production costs. In addition, the addition of high carbon silicon can also refine the cast iron structure, reduce shrinkage and crack defects, and improve the yield rate of castings.

As the steel and foundry industries have higher requirements for material performance, the market demand for high-carbon silicon has grown steadily. Especially in major steel-producing countries such as China and India, high-carbon silicon has gradually replaced some traditional ferrosilicon applications due to its cost-effectiveness. 

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