Heavy-Duty Metallurgical Silicon Carbide Lump 88% (10-50mm) for Steel Plant Operations
- Enhance Heat Retention: Utilize the high energy release from SiC oxidation to maintain bath temperature, cutting down on electrode power consumption.
- Stable Deep-Melt Dissolution: 10-50mm lumps are designed to bypass the slag layer and react directly within the metal for maximum recovery.
- Low-Impurity Steelmaking: Ultra-low nitrogen and sulfur levels make this the ideal additive for producing high-strength, clean steel grades.
- Effective Slag Deoxidation: Rapidly reduces FeO levels in the slag, creating a protective "reducing" environment for expensive alloys.
- Consistent Bulk Supply: ZhenAn provides large-tonnage inventory with verified chemical stability and ISO-certified quality for 24/7 industrial use.
The Strategic Value of 10-50mm SiC Lumps in Melting
In high-volume steel production, the physical size of the additive is as critical as its chemistry. ZhenAn's 10-50mm Silicon Carbide Lumps are the preferred choice for primary furnace charging. Unlike finer granules that may be lost to the furnace exhaust, these robust lumps penetrate the scrap pile, ensuring the reaction occurs at the heart of the heat.
The metallurgical dissociation follows a powerful exothermic path:
SiC + 2FeO → 2Fe + SiO₂ + CO↑
The CO gas generated during this reaction promotes a vigorous "boiling" effect, which helps in removing dissolved gases and lifting non-metallic inclusions to the slag layer.
Key Applications & Performance Gains
Electric Arc Furnace (EAF) Charging
SiC 88% lumps are typically added during the initial scrap basket charge. Their density ensures they remain submerged, providing a sustained deoxidation effect that protects the furnace hearth and lowers the total oxygen potential early in the heat.
Converter (BOF) Chemical Fuel
In Basic Oxygen Furnaces, these lumps serve as a "heat riser." For mills looking to increase their scrap-to-hot-metal ratio, the oxidation of SiC provides the necessary thermal energy to melt extra scrap without compromising the liquidus temperature.
High-Carbon Steel Production
For grades requiring tight carbon control, SiC 88% provides a more predictable and lower-nitrogen carbon source than traditional anthracite or petroleum coke, leading to more reliable "hit rates" in the laboratory.
Technical Specifications & Charge Standards
The following table outlines the structural and chemical robustness of ZhenAn 10-50mm Silicon Carbide Lumps, optimized for heavy furnace charging.
| Quality Index |
Guaranteed Value |
Physical Property |
Details |
| SiC Purity (Min) |
88.0% |
Size Distribution |
10 - 50 mm (90% min) |
| Free Graphite (C) |
2.0% - 4.0% |
Crushing Strength |
High (Minimal Fines) |
| Free SiO₂ (Max) |
3.5% |
Specific Gravity |
3.18 g/cm³ |
| Sulfur (S) |
≤ 0.05% |
Color |
Dark Metallic Grey |
| Moisture (Max) |
0.4% |
Packaging |
1.25mt Jumbo Bags |
Why Procurement Managers Trust ZhenAn SiC Lumps
- Minimal Material Waste: Our 10-50mm lumps undergo secondary screening to remove small fragments and dust, ensuring that every ton purchased reaches the molten bath.
- Refractory Protection: By reducing the FeO content in the slag early, our SiC helps create a stable "foamy slag" that shields the furnace walls from arc radiation.
- Verified Global Quality: Every shipment from ZhenAn is tested to meet international metallurgical standards. We provide a full COA and facilitate third-party inspections (SGS/BV) upon client request.
FAQ: Frequently Asked Questions
Why are 10-50mm lumps preferred over 1-10mm granules for primary charging?
Lumps have the necessary mass and mechanical strength to withstand the impact of heavy scrap baskets. Smaller granules are often blown away by the furnace fans or trapped in the slag before they can reach the molten metal.
How does SiC 88% help in reducing Nitrogen in steel?
Many carbon raisers contain high nitrogen which can lead to brittleness. Silicon Carbide is virtually nitrogen-free. By using SiC 88% as a carbon source, you can produce low-nitrogen steel grades more reliably.
Does the use of SiC lumps affect the "Foamy Slag" process?
Yes. The CO gas generated by the SiC reaction creates a consistent, thick foam. This foamy slag improves energy efficiency by insulating the arc and protecting the refractories from intense thermal radiation.
Can SiC 88% lumps be used as a coolant or heat riser in BOF?
Absolutely. In BOF operations, SiC is used as a chemical fuel. It is particularly useful when the scrap-to-hot-metal ratio is high and extra thermal energy is required to reach the target tapping temperature.
What is the replacement ratio for Ferrosilicon 75?
Typically, 1 ton of SiC 88 provides approximately the same amount of Silicon as 1.15 tons of FeSi 75, while also providing roughly 250kg of "free" Carbon. This allows for significant cost savings in raw material procurement.
Is the material packaged for long-distance sea freight?
Yes. Our SiC 10-50mm lumps are packed in heavy-duty, UV-resistant jumbo bags with internal PE liners to ensure the material arrives dry and chemically active, regardless of the shipping duration.
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