What is a calcium-silicon alloy?
Calcium-silicon alloy (CaSi) is a high-performance composite ferroalloy primarily composed of calcium (Ca) and silicon (Si), with trace amounts of iron, aluminum, carbon, and other impurities. It is refined using a high-temperature reduction smelting process. As a core metallurgical auxiliary material in modern steelmaking, casting, and special alloy production, calcium-silicon alloy has become an indispensable material in the metallurgical industry due to its powerful deoxidizing, desulfurizing, and inclusion-modifying properties.
Chemical Composition of Calcium-Silicon Alloy
|
Item |
CaSi 30-55 |
|
Ca Min(%) |
28-32 |
|
Si Min(%) |
50-58 |
|
C Max(%) |
0.8 |
|
Al Max(%) |
2.0 |
|
P Max(%) |
0.04 |
|
S Max(%) |
0.05 |
|
Item |
CaSi 30-60 |
|
Ca Min(%) |
28-32 |
|
Si Min(%) |
58-62 |
|
C Max(%) |
0.6 |
|
Al Max(%) |
1.5 |
|
P Max(%) |
0.03 |
|
S Max(%) |
0.04 |
The Role and Advantages of Calcium-Silicon Alloy in the Metallurgical Industry
Highly Efficient Deoxidation and Impurity Removal, Improving Steel Purity: Calcium has a strong affinity for oxygen, and when combined with silicon, it forms a synergistic reaction, quickly removing dissolved oxygen from molten steel and preventing oxide inclusions that lead to defects such as cracks and porosity in the steel. Compared to traditional aluminum deoxidation processes, calcium-silicon alloy significantly reduces secondary oxidation, resulting in a marked improvement in the purity of the finished steel.
Deep desulfurization modification optimizes steel's mechanical properties: Silicon-calcium alloys effectively bind sulfur impurities in molten steel, transforming harmful linear sulfides into harmless spherical inclusions. This significantly improves the steel's ductility, impact resistance, and fatigue strength, a crucial characteristic for the production of high-end steel, special steel, and automotive steel.
Steelmaking industry: In-furnace refining and ladle refining of ordinary carbon steel, alloy steel, stainless steel, and special steel.
Foundry industry: Inoculation treatment of gray cast iron, ductile iron, and vermicular graphite cast iron; deoxidation and desulfurization of precision castings.
Non-ferrous metallurgy: Deoxidation, impurity removal, and purification in the smelting of non-ferrous metals such as copper, aluminum, and nickel.
Metallurgical auxiliary materials: Raw materials for steel cored wire and cored wire; base materials for metallurgical purifying agents and modifiers.
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Quality Controlled Throughout: Standardized production throughout the entire process; each batch of products undergoes spectral analysis, ensuring precise composition, compliance with impurity standards, and strong batch stability.
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