Calcium Silicon Alloy

Calcium silicon alloy is mainly composed of two elements: silicon and calcium. The content of silicon is usually between 30% and 60%, while the content of calcium is between 25% and 35%. Also contains varying amounts of impurities such as iron, aluminum, carbon, sulfur and phosphorus. In the steel industry, it is used as calcium additive, deoxidizer, desulfurizer and denaturant for non-metallic inclusions. Used as inoculant and denaturant in the cast iron industry.

In addition, on the basis of siliconcalcium alloy, other elements are added to form a ternary or multi-element composite alloy. Such as Si-Ca-Al; Si-Ca-Mn; Si-Ca-Ba, etc., used as deoxidizer, desulfurizer, denitrification agent and alloying agent in iron and steel metallurgy.

One-step method (submerged arc furnace): SiO2 + CaO + C are reduced at 1500–1800°C to form Si-Ca. Depending on the charging method, mixed charging or layered charging is used. This method is simple to operate, but produces large slag volumes and low recovery rates.

Two-step method: Calcium carbide (or high-carbon ferrosilicon) is first produced, followed by secondary smelting with silica/lime. This improves performance and stability.

Key Points: Ca has a low boiling point and is highly volatile. SiO2 vapor reacts with C to form a CaC2/SiC intermediate phase, requiring a highly active carbonaceous reducing agent and off-furnace refining to reduce impurities.

1,Iron enhancement:

Calcium silicon alloy is a common ferro alloy used to improve the properties of steel. It can improve the hardness, strength and wear resistance of steel, and also help to lower the melting point of steel and improve the fluidity of steel, making the steel production process more efficient.

2,Deoxidizer and alloying agent:

CaSi alloy is widely used as a deoxidizer and alloying agent in steel smelting. It can effectively remove oxygen from the melt to prevent the formation of oxides, and can control the content of other elements in the alloy to adjust the properties of steel.

3,Rare earth treatment agent:

4,Other applications:

CaFeSi alloy is also used as a desulfurizer and alloying agent for cast iron, as well as an additive for aluminum alloys and magnesium alloys, and has a certain effect on the performance of these alloys.

We provide a variety of specifications of silicon calcium alloy products to meet the diverse needs of different customers. Common grades include Ca31Si60, Ca28Si60, Ca24Si60, Ca20Si55, Ca16Si55, etc. Each grade meets strict industry standards in terms of calcium, silicon content and impurity control. At the same time, we also have strong customized production capabilities, and can accurately adjust the alloy composition and product size according to the special requirements of customers, ensuring that we provide you with high-quality products that best meet your actual needs.

Strictly inspect size distribution:

During procurement, the qualified size rate of CaSi alloys must be ≥95% (for example, for a 5-30mm specification, particles outside this range must account for ≤5%) to avoid excessive inclusions of powder or large lumps.

Adjust based on process dynamics:

If splashing occurs during steelmaking, the size can be appropriately increased (for example, from 5-20mm to 10-30mm). If inclusions exceed the standard, the size can be appropriately reduced (for example, from 15-30mm to 8-20mm).

Optimize the addition process:

For coarse particles, we recommend batch addition with extended stirring time. For fine particles (or core wire), we recommend weak argon stirring to balance reaction speed and inclusion flotation.

Monitor element yield:

Spectroscopic analysis of the actual silicon and calcium content in the molten steel can be used to verify the appropriate size (low yield is often caused by inappropriate size).

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