Calcium Silicon Alloy Lumps

Silicon calcium alloy lumps is an alloy product obtained by smelting silica, lime and coke in a strong reducing atmosphere at 1500-1800 degrees. It is composed of silicon and calcium, with silicon content usually between 40% and 65% and calcium content between 15% and 30%. Impurities may contain different amounts of impurities such as iron, aluminum, carbon, sulfur and phosphorus.

It is relatively stable at high temperatures. During the process of steel smelting, it can react chemically with oxygen and sulfur in molten steel to play a role in deoxidation and desulfurization. Silicon and calcium in the alloy have a strong affinity with oxygen and can generate stable oxides, thereby reducing the oxygen content in molten steel; calcium can also react with sulfur to generate sulfides such as calcium sulfide.

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Steel industry

As a calcium additive, deoxidizer, desulfurizer and denaturant of non-metallic inclusions, it can reduce the oxygen and sulfur content in steel, change the shape and properties of inclusions, and improve the purity, strength, toughness, corrosion resistance and other properties of steel. It is used to produce clean steel, high-quality steel and special performance steel.

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Cast iron industry

Used as an inoculant and modifier, it helps to form fine or spherical graphite, make the graphite in gray cast iron evenly distributed, reduce the tendency of white cast iron, increase silicon, desulfurize, and improve the quality of cast iron.

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Other fields

In the power industry, it can be used to manufacture power equipment such as high-temperature cables, power station transmission lines and transformer cores; it can also be used to improve the heat resistance, wear resistance and oxidation resistance of refractory materials, and to produce ultra-pure silicon wafers.

Strong deoxidation ability:

Calcium and silicon in CaSi alloy have a strong affinity with oxygen in molten steel, and the deoxidation effect is thorough, which can deeply deoxidize molten steel.

Improve the morphology of inclusions:

It can change the shape and properties of non-metallic inclusions, make their particles larger and easier to float, which is conducive to quickly purifying molten steel and improving the quality of steel.

Improve the performance of steel:

It can improve the crystallization system of steel, reduce the size deviation of steel, improve the stability of steel, and improve the corrosion resistance of steel and extend the service life of steel.

We understand that the value of Silicon Calcium alloy lumps is fully realized only through their precise application. Our team brings decades of combined experience in steelmaking, foundry operations, and ladle metallurgy, enabling us to offer more than just a product-we offer a partnership.

 Technical Consultation on Grade & Size Selection: As outlined in our composition table, choosing the right SiCa grade (e.g., high-calcium Ca31Si60 vs. standard Ca24Si60) and lump size (e.g., 10-50mm for ladle additions, 1-6mm for fine-tuning) is critical. Our metallurgists can work with you to analyze your steel grades (clean steel, high-quality alloy steel) and process conditions to recommend the most cost-effective and performance-optimized solution.

 Process Optimization Support: We can provide guidance on addition methods, expected recovery rates, and best practices for achieving deep deoxidation, efficient desulfurization, and optimal inclusion morphology control based on your specific furnace conditions.

 Customized Solutions: Beyond standard grades and lump sizes, we can tailor the product to match your exact handling and feeding systems, ensuring smooth operations and maximum yield.

Q: What is the difference between using calcium silicon alloy lumps and cored wire? How do I choose?
A: Both share the same core material but are optimized for different addition methods. Calcium silicon alloy lumps (like those on this page) are typically added directly to the ladle during tapping or to the slag surface in a ladle furnace (LF). This method is suitable for general deoxidation, desulfurization, and alloying in many steel grades and foundry applications. Calcium silicon cored wire is designed for deep injection into molten steel using a wire feeder, which provides higher and more consistent calcium recovery, making it the preferred choice for precise inclusion modification in high-end steel grades like pipeline or bearing steel. We offer both products and can help you choose the best method for your specific process and quality targets.

Q: How do I determine the correct lump size for my ladle addition?
A: The ideal lump size ensures efficient dissolution without excessive oxidation or loss. For general ladle additions during tapping, a common and effective size range is 10-50mm or 10-100mm. This size is large enough to penetrate the slag layer and dissolve effectively, but not so large that it remains unmelted. For smaller ladles or more precise additions, smaller sizes like 1-6mm or 0.2-2mm may be recommended. We can customize the sizing based on your specific ladle volume, addition point, and mixing conditions.

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