The Role of 88% SiC in Modern Metallurgy
Metallurgical grade Silicon Carbide with 88% purity is the "workhorse" of the steel and foundry industry. While SiC 90 is used for ultra-high purity applications, SiC 88 offers the perfect balance of performance and economy for standard carbon steel and gray iron production.
The deoxidation process using SiC 88 is highly exothermic, providing "chemical heat" to the furnace. This helps maintain the molten steel temperature during alloy additions, reducing the electricity consumption of the Electric Arc Furnace (EAF).
Key Applications & Performance Benefits
Ladle Deoxidation (1-3mm Granules)
The 1-3mm size is ideal for ladle furnace (LF) additions. Because of its high density compared to slag, it penetrates the slag-metal interface quickly, ensuring that the Silicon and Carbon are absorbed by the metal rather than burning off on the surface.
Induction Furnace Inoculation
In the casting industry, SiC 88 acts as a potent nucleating agent. It promotes the formation of graphite flakes and nodules, significantly reducing the "chill" (hard spots) in thin-walled castings.
Slag Reduction & Fluxing
By adding SiC 88 to the slag, operators can "kill" the slag, reducing its oxygen potential. This leads to better recovery of other alloying elements like Manganese and Chromium, which would otherwise be lost to oxidation.
FAQ: Frequently Asked Questions
1. Is 88% SiC less effective than 90% SiC for deoxidation?
In terms of chemical potential, the difference is marginal for most standard steel grades. SiC 88 provides a more economical "cost-per-unit of Silicon" than SiC 90, making it the preferred choice for bulk steel production where extreme purity is not the primary constraint.
2. Why is the 1-3mm size preferred over larger lumps?
The 1-3mm granules provide a much higher surface-to-volume ratio. This allows for a nearly instantaneous reaction when the material hits the molten steel, preventing the granules from being trapped in the slag layer.
3. Does SiC 88 affect the nitrogen levels in the steel?
Silicon Carbide is naturally low in nitrogen. Using SiC 88 as a carbon source instead of certain types of coal or coke can actually help steelmakers maintain lower nitrogen levels in nitrogen-sensitive grades.
4. How much SiC 88 should be added per ton of steel?
Typically, 1.5kg to 3kg per ton is used for deoxidation, depending on the initial oxygen content and the target silicon level. For foundries, the dosage is usually adjusted based on the required final carbon equivalent (CE).
5. What is the advantage of SiC 88 over Ferrosilicon 75?
SiC 88 is generally 20-30% cheaper than FeSi 75 per unit of Silicon. Additionally, SiC 88 provides "free" carbon and extra thermal energy through its exothermic reaction, which Ferrosilicon does not offer.
6. Can ZhenAn provide a COA (Certificate of Analysis) for each shipment?
Yes. Every batch of ZhenAn SiC 88 is sampled and tested in our laboratory. We provide a full COA covering SiC, Free C, Fe, and Particle Size Distribution with every delivery to ensure total traceability.
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