High-Performance Silicon Carbide 90% (0-10mm) - Strategic Metallurgical Grade for Casting & Smelting
- Reduce Casting Rejections: Eliminate gas-hole defects and subsurface pinholes by maintaining a superior deoxidation state in the melt.
- Dual-Action Chemistry: Simultaneously enrich Silicon and Carbon with 90% SiC, reducing the need for multiple high-cost ferroalloys.
- Broad 0-10mm Gradation: Perfectly balanced size distribution for sustained reaction during both primary melting and final holding.
- Lower Operational Costs: Replace expensive pig iron and ferrosilicon with a single, high-energy exothermic furnace additive.
- ZhenAn Tier-1 Supply: Benefit from 150,000 tons of annual capacity and ISO-certified consistency for high-volume smelting operations.
The Metallurgical Edge of 90% SiC in Smelting
In high-end smelting and casting, the precision of your deoxidizer dictates the final mechanical properties of the iron. ZhenAn's 0-10mm Metallurgical SiC 90% provides a more stable and cost-effective alternative to ferrosilicon 75. Unlike metallic silicon, SiC provides carbon and silicon in a pre-bonded state that dissociates exothermically.
The reaction kinetics in the furnace are highly efficient: SiC + 3[O] → SiO₂ + CO↑
The resulting CO gas provides a "micro-stirring" effect, which helps float non-metallic inclusions to the surface, resulting in a cleaner, more homogenous base metal for ductile and gray iron.
Core Applications & Performance Gains
Gray and Ductile Iron Foundries
SiC 90% is the ultimate pre-conditioner. By increasing the number of eutectic cells, it promotes "A-type" graphite flake growth and prevents the formation of hard, brittle iron carbides (chill) in thin-walled castings.
Induction & Cupola Smelting
The 0-10mm sizing is ideal for "sandwich" charging. The finer particles (0-1mm) provide immediate deoxidation, while the larger lumps (5-10mm) survive the initial melting phase to provide long-term inoculation and carbon stability.
Slag Management & Conditioning
High-purity SiC reduces the FeO and MnO content in the slag. This "dries" the slag, making it less chemically aggressive toward the furnace refractories, thereby extending the campaign life of the lining.
Technical Properties & Certified Specifications
The following parameters detail the chemical and physical consistency of ZhenAn 0-10mm Metallurgical SiC 90%, specifically processed for industrial smelting.
| Quality Index |
Guaranteed Value |
Physical Feature |
Details |
| SiC Content (Min) |
90.0% |
Particle Size |
0 - 10 mm (Adjustable) |
| Free Graphite (C) |
≤ 2.5% |
Hardness |
9.2 Mohs |
| Iron Oxide (Fe₂O₃) |
≤ 1.2% |
Bulk Density |
1.55 g/cm³ |
| Sulfur (S) |
≤ 0.04% |
Nitrogen (N) |
≤ 0.012% |
| Moisture (Max) |
0.4% |
Appearance |
Dark Metallic Grains |
Why Procurement Teams Choose ZhenAn SiC 90%
- Stable Nucleation: Our 90% grade provides a "memory effect" in the melt, meaning the inoculation benefits persist longer during holding than traditional FeSi treatments.
- Minimal Impurities: Low aluminum and phosphorus levels make this material safe for safety-critical automotive and aerospace castings.
- Global Logistics: ZhenAn provides comprehensive export documentation, including third-party SGS/BV inspection, ensuring a seamless supply chain from China to your foundry.
FAQ: Frequently Asked Questions
Why use 0-10mm SiC instead of pure Silicon metal?
Silicon Carbide is significantly more cost-effective and provides a stable source of Carbon. Furthermore, the reaction of SiC is exothermic, adding "free" heat to the furnace, whereas metallic silicon can sometimes cause local cooling of the melt.
How does SiC 90% improve the machinability of castings?
By promoting uniform graphite precipitation and reducing the presence of hard cementite, the resulting iron is much easier to drill and mill. This results in longer tool life and lower finishing costs for the machine shop.
What is the recommended addition timing for induction furnaces?
For best results, SiC 90% should be added with the primary scrap charge. This maximizes the contact time between the SiC and the melting metal, ensuring the highest possible recovery rates for both Silicon and Carbon.
Can 0-10mm SiC be used in cupola furnaces?
Yes. The larger particles in the 0-10mm range have the necessary density to survive the descent through the cupola stack, reacting effectively at the melting zone to deoxidize the slag and inoculate the iron.
How does ZhenAn ensure the 90% purity is consistent?
We perform batch-wise testing in our own laboratory using chemical titration and XRF analysis. Every shipment is accompanied by a full Certificate of Analysis (COA) to ensure it meets the 90% minimum SiC requirement.
Does this material cause extra wear on the furnace lining?
On the contrary, SiC 90% typically extends the life of neutral and basic furnace linings. By deoxidizing the slag and reducing its acidity, it prevents the chemical erosion of the refractory bricks.
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