SiC powder

Silicon Carbide (SiC)

the Silicon Carbide used in steelmaking utilizes low-grade SiC. It plays a very important role in the metallurgical industry.

It acts as a highly efficientcomposite deoxidizer, capable of simultaneously deoxidizing, recarburizing, silicifying, and even assisting in temperature adjustment. Currently, it is widely used to replace or partially replace expensive traditional materials like ferrosilicon and recarburizers, thereby reducing steelmaking costs.

Core Functions and Mechanism

When SiC is added to molten steel, it undergoes a chemical reaction. The primary equation is:

SiC + FeO → Si + Fe + CO↑

The main benefits of this reaction include:

Deep Deoxidation:The reaction quickly reduces the oxygen content in the molten steel. The generated CO gas also rises, stirring the molten bath and helping to remove impurities, thus purifying the steel.

Effective Recarburization and Silicification:The silicon (Si) and carbon (C) released by the reaction dissolve into the molten steel, effectively adding both elements simultaneously.

Improved Steel Cleanliness:SiC contains far fewer impurities (such as sulfur and nitrogen) than traditional recarburizers (e.g., petroleum coke), which is beneficial for improving the final steel quality.

Auxiliary Temperature Adjustment:The deoxidation reaction is exothermic, which helps raise the temperature of the molten steel. It can be used as a heating agent when the carbon content is high but the temperature is low.

Item	SiC80	SiC85	SiC90	Note
SiC	≥ 80.0%	≥ 85.0%	≥ 88.0% Or ≥ 90.0%	The higher the purity, the better the oxygen removal effect.
F.C	≤ 5.0%	≤ 4.5%	≤ 2.0% - 4.5%	Excessive amounts of unreacted carbon can compromise purity.
SiO₂	≤ 8.0%	≤ 7.0%	≤ 1.0% - 5.0%	One of the main impurities; the lower its content, the higher the product grade.
Fe₂O₃	≤ 3.0%	≤ 1.8%	≤ 0.5% - 1.8%	Harmful impurities must be strictly controlled to avoid compromising the purity of molten steel.
H₂O	≤ 0.5%	≤ 0.5% - 0.8%	≤ 0.2% - 0.5%	Excessive higher content may impair usability and pose safety risks.
Grain size	0-5mm, 0-10mm, 0.5-5mm	0-10mm	0-10mm, 0.5-5mm, 1-3mm	Customized according to the feeding method and process requirements.