Calcium Silicon Alloy For Metallurgy

Calcium silicon alloy for metallurgy are alloy products obtained from silica, lime and coke in a strong reducing atmosphere at 1500-1800 degrees. Silicon and calcium are the main components, and they also contain different amounts of impurities such as iron, aluminum, carbon, sulfur and phosphorus. Common CaSi alloy grades such as Ca31Si60 contain no less than 31% Ca and 50%-65% Si. Calcium has a strong affinity with oxygen, sulfur, hydrogen, nitrogen and carbon in molten steel. When calcium silicon is added to molten steel, it will produce a strong exothermic effect.

Steelmaking field

It is used in the later refining stage of converter steelmaking, the reduction period or refining period of electric furnace steelmaking, and the refining process outside the furnace. It can be used for deep deoxidation, desulfurization and composition fine-tuning to produce high-quality steel, special performance steel, etc.

Casting field

In cast iron production, in addition to deoxidation and purification, it also plays a nurturing role, which helps to form fine-grained or spherical graphite, make the graphite in gray cast iron evenly distributed, reduce the tendency of white cast iron, and increase silicon, desulfurize, and improve the quality of cast iron.

Q: My steel mill doesn't have a wire feeder. Can I use cored wire?

A: No. Cored wire requires a wire feeder to be fed into molten steel. We suggest you purchase a wire feeder first (the investment is small), or use block additives initially, but the yield will be much lower.

Q: What's the difference between FeSi cored wire and pure calcium cored wire?

A: FeSi cored wire is made of CaSi powder, with a low calcium content (≤31%), but silicon also has a deoxidizing effect. Pure calcium cored wire is made of calcium metal powder, with a high calcium content (≥97%), but it's much more expensive. Domestic steel mills commonly use FeSi cored wire because it's more cost-effective.

Q: How do you test the calcium content in molten steel after calcium treatment?

A: Use a spectrometer or atomic absorption spectrometry. Generally, the residual calcium content in molten steel should be between 15-30 ppm. Below 10 ppm, the calcium treatment effect may be insufficient; above 40 ppm, it may affect the casting performance of the molten steel.

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