Novel Silicon Carbon Alloys in Converter Smelting

Silicon carbon alloys, also known as high carbon silicon, are a new type of alloy used in converter smelting. This alloy can replace traditional ferrosilicon, silicon carbide, and recarburizing agents, thereby reducing the amount of deoxidizer used. In the deoxidation alloying process of converter smelting, silicon carbon alloys exhibit stable effects, significantly improving the chemical composition, mechanical properties, and internal quality control of the steel, surpassing traditional processes. Its unique advantage lies in its ability to improve the quality of molten steel, enhance product performance, and simultaneously reduce the amount of alloy added, lowering steelmaking costs and thus improving economic efficiency.

Application Background of Silicon Carbon Alloys

For a long time, the alloy varieties used in converters have been relatively simple, mainly taking Q195 and Q235 steel grades as examples. Their smelting processes include MnSi, FeSi, SiAlCaBa, SiC, and recarburizing agents. For HRB335 and HRB400 steel grades, MnSi, FeSi, AlSi, and recarburizing agents are used in production. However, with the increasing scarcity of traditional ferrosilicon and silicon manganese alloy resources, market prices have continued to rise, leading to a continuous increase in the cost of converter steelmaking and thus squeezing the profit margins of steel products. Furthermore, the recovery rate of traditional alloys is significantly affected by converter operations, including factors such as tapping rate, final temperature, and slag discharge, all of which cause fluctuations in the alloy composition of the finished product. This results in unstable chemical composition of the smelted steel and a corresponding decrease in the pass rate of internal control indicators for the finished product.

Characteristics and Functions of Silicon Carbon Alloys
Silicon carbon alloys, a new type of alloy composed of silicon and carbon, are produced by a limited number of manufacturers, mainly concentrated in Anyang, Henan Province. With the increasing demand for silicon carbon alloys from steel mills, its market prospects are increasingly promising.

Silicon carbon alloys, also known as high carbon ferrosilicon, are a ferrosilicon alloy with a high carbon content. In the steelmaking process, it is often used as a strong composite deoxidizer, suitable for smelting general steel, alloy steel, and special steel. In addition, it can also be used as a heating agent, replacing traditional high-priced heating agents to meet the needs of converter and open-hearth steelmaking.

High carbon ferrosilicon offers significant advantages as a deoxidizer, such as the absence of hydrogen generation during the deoxidation process, ensuring safety and reliability. Furthermore, carbon and silicon are key elements determining the properties of steel; high carbon ferrosilicon not only reacts with oxygen in molten steel for deoxidation but also dissolves in the steel to increase the silicon and carbon content, achieving a dual benefit.

The deoxidation process is crucial in steelmaking, and ferrosilicon, due to its strong chemical affinity for oxygen, is a commonly used deoxidizer. Through precipitation and diffusion deoxidation, the silicon content in steel is increased, thereby significantly enhancing the steel's strength, hardness, and elasticity.

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