Products Description
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.
Chemical Composition
|
Brand |
Chemical Composition % |
|||||
|
Ca |
Si |
C |
Al |
P |
S |
|
|
≥ |
≥ |
≤ |
||||
|
Ca31Si60 |
31 |
55-65 |
1.0 |
2.4 |
0.04 |
0.06 |
|
Ca28Si60 |
28 |
55-65 |
1.0 |
2.4 |
0.04 |
0.06 |
|
Ca24Si60 |
24 |
55-65 |
1.0 |
2.5 |
0.04 |
0.04 |
|
Ca20Si55 |
20 |
50-60 |
1.0 |
2.5 |
0.04 |
0.04 |
|
Ca16Si55 |
16 |
50-60 |
1.0 |
2.5 |
0.04 |
0.04 |
Products Uses
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.
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.
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.
Application advantages
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.
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