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Why is calcium silicate used as raw material for steel making?

Calcium-silicon alloy is mainly used as a high-efficient compound deoxidizer and purifier in steelmaking, and its core functions and applications are as follows:

Calcium-silicon alloy can be deeply deoxidized and desulfurized.

Calcium and silicon elements react with oxygen and sulfur in the molten steel and generate low-melting-point oxides (e.g., SiO₂, CaS) to float and exclude them, which significantly reduces the oxygen and sulfur content and improves the purity of molten steel. The purity of molten steel is improved.

Desulphurization efficiency: Calcium recovery rate reaches 24.32%, comprehensively reducing the content of harmful elements.

Calcium-silicon alloy to control inclusions

Change the high melting point aluminum oxides (such as Al₂O₃) into low melting point calcium and aluminum compounds (12CaO-7Al₂O₃), reduce the clogging of continuous casting spout, and improve the casting performance.

Refinement of grain structure, improve the mechanical strength, toughness and ductility of steel.

Calcium-silicon alloy can make the elements fixed and stabilized

Fixed nitrogen, carbon and other elements, reduce segregation defects, optimize the corrosion resistance of special steel (such as stainless steel, rail steel) and welding performance.

Calcium Silicon Alloy Application Process

Calcium Silicon Alloy Feeding Technology

Calcium Silicon Alloy Powder is wrapped in cold rolled steel strip (0.6-0.7mm thick) and injected into the steel through the feeder to penetrate the slag layer, with precise control of the amount of additive to increase the alloy yield by 20-30%.

Calcium silicate alloy is used as compound deoxidizer

It is used in conjunction with compound deoxidizers such as calcium silica-aluminum-barium, solving the problem of low efficiency of a single deoxidizer, and reducing the cost of comprehensive treatment and refining by 18-22%.

Economic benefits of calcium-silicon alloy

Cost reduction and efficiency: shorten the smelting time, improve the utilization rate of alloy, and reduce the cost of ton of steel by 20-30%.

Quality Improvement: Reduce the segregation of ingot, improve the processing performance and corrosion resistance of steel, applicable to ultra-pure steel, new energy automobile motor shell and other high-end fields.

Safety Tips for Silica-Calcium Alloys

The treatment process needs to prevent and control the release of hydrogen sulfide (H₂S) gas to ensure production safety.