Products Description
Low Carbon Silicon Carbide (SiC) is a specialized form of silicon carbide designed for metallurgical applications where minimal carbon contamination is critical. Unlike standard SiC, which may contain free carbon (up to 2%), low-carbon SiC has a reduced carbon content (typically below 0.5%), making it ideal for high-precision steelmaking, aluminum refining, and other processes requiring strict carbon control.
Produced through advanced purification techniques, low-carbon SiC retains the exceptional thermal conductivity, hardness, and chemical stability of traditional SiC while minimizing unwanted carbon pickup in molten metals. It is available in powder, granules, and custom-sized particles, ensuring compatibility with various industrial processes.
This material is particularly valuable in electric arc furnaces (EAF), ladle refining, and specialty alloy production, where precise carbon adjustment is necessary to meet stringent quality standards.
Specifications
Low Carbon Silicon Carbide is engineered to meet strict metallurgical requirements. Below are its key specifications:
| Parameter | Specification Range |
|---|---|
| SiC Content | 90% - 99% |
| Free Carbon | ≤ 0.2% - 0.5% |
| SiO₂ | ≤ 1% - 3% |
| Fe₂O₃ | ≤ 0.3% - 0.8% |
| Al₂O₃ | ≤ 0.2% - 0.6% |
| Grain Size | 0.1mm - 10mm (adjustable) |
| Bulk Density | 1.6 - 2.0 g/cm³ |
| Melting Point | ~2700°C |
| Thermal Conductivity | 120 - 200 W/m·K |
Grades Available:
- Ultra-Low Carbon SiC (≤ 0.2% C) – For ultra-high-purity steel and superalloys.
- Standard Low Carbon SiC (≤ 0.5% C) – Used in most carbon-sensitive metallurgical processes.
- High-Purity Low Carbon SiC (≥ 98% SiC, ≤ 0.3% C) – For semiconductor and advanced alloy applications.
Key Features & Benefits
Minimal Carbon Contamination
- Prevents excessive carbon pickup in molten metals, crucial for low-carbon steel, stainless steel, and aluminum refining.
- Ensures consistent chemical composition in final products.
Enhanced Deoxidation Efficiency
- Reacts with oxygen to form SiO₂ and CO, reducing slag formation and improving metal purity.
- More efficient than traditional deoxidizers like ferrosilicon and aluminum.
Superior Thermal & Chemical Stability
- Withstands extreme temperatures (up to 1600°C) without decomposition.
- Resistant to oxidation and slag erosion, prolonging furnace lining life.
Energy & Cost Savings
- Accelerates melting and refining processes, reducing power consumption.
- Lowers reliance on high-cost low-carbon additives.
Improved Mechanical Properties
- Enhances strength, toughness, and corrosion resistance in alloys.
- Reduces brittleness and porosity in cast metals.
Environmentally Friendly
- Generates less CO₂ emissions compared to carbon-heavy alternatives.
- Reduces slag waste and metal loss due to higher efficiency.
Applications in Metallurgy
Low-Carbon & Stainless Steel Production
Deoxidation: Removes dissolved oxygen without excessive carbon addition.
Alloying Agent: Adjusts silicon content while keeping carbon levels low.
Ladle Refining: Enhances steel cleanliness and inclusion control.
Aluminum & Non-Ferrous Metal Refining
Grain Refiner: Improves microstructure in aluminum alloys.
Impurity Removal: Reduces oxides and non-metallic inclusions.
Foundry & Casting
Inoculant: Promotes uniform graphite formation in ductile iron.
Slag Conditioner: Optimizes slag fluidity and metal-slag separation.
Specialty Alloys & Superalloys
Used in aerospace, automotive, and high-performance alloys requiring precise carbon control.
Essential for nickel-based superalloys and titanium refining.
Advanced Applications
Semiconductor Manufacturing: High-purity SiC for electronics.
Refractory Additives: Improves thermal shock resistance in furnace linings.
Products Description
1. Background & Introduction
In the modern metallurgical industry, the pursuit of higher purity and lower impurity content in specialty steel grades has become increasingly critical. A prominent challenge faced by steelmakers is the trade-off between effective deoxidation and the unintended introduction of carbon into the melt. Traditional recarburizers and ferrosilicon alloys, while effective, often lead to carbon pickup, compromising the ductility and weldability of ultra-low carbon steels.
2. The Challenge
In early 2025, a tier-1 electric arc furnace (EAF) steel plant in Europe producing high-grade automotive sheet metal encountered a persistent quality control issue. During the secondary refining process, the use of standard 75% Ferrosilicon for deoxidation resulted in excessive carbon absorption, pushing the final carbon content above the stringent 0.03% maximum required by their client. This resulted in a 12% rejection rate of heat lots, increasing production costs by approximately €45 per ton due to re-melting and re-processing.
3. The Solution: Low Carbon Silicon Carbide
The plant's metallurgical team switched to a specialized Low Carbon Silicon Carbide (LC-SiC) ferro alloy. This product, containing 88-90% SiC and a strictly controlled carbon content of less than 0.5%, was introduced during the ladle refining furnace (LF) stage. Unlike conventional FeSi, LC-SiC offers a dual action: it acts as a powerful deoxidizer through silicon, while the carbon is chemically bound in a stable form, significantly reducing the kinetic activity for carbon dissolution into the molten steel.
4. Implementation Strategy
The alloy was added in two stages:
Bulk Addition (70%): Added to the ladle during tapping to pre-condition the slag and initiate rapid slag foaming.
Tuning Addition (30%): Added in the final 15 minutes of LF treatment for fine-tuning of oxygen activity, ensuring the final oxygen levels dropped below 15 ppm without disturbing the carbon equilibrium.
5. Key Results & Data
After a three-month trial period, the plant recorded the following critical data improvements:
Carbon Control: The average carbon pickup was reduced from 0.045% to 0.017%, keeping the final product consistently well below the 0.03% threshold. The rejection rate dropped to 1.5%.
Yield Improvement: The silicon recovery rate improved to 92%, outperforming the 85% recovery rate of standard FeSi due to the reduced oxidation at the slag-metal interface.
Energy Savings: The exothermic nature of SiC oxidation reduced the electrical energy required for ladle heating by 8%, saving roughly €2.10 per ton of liquid steel.
Refractory Longevity: Lower operating temperatures and reduced slag aggressiveness extended ladle refractory life by 15%.
6. Financial Impact
Over the duration of the trial (processing 80,000 tons of steel), the plant generated a net saving of €480,000. This was derived from reduced scrap costs, lower energy consumption, and decreased refractory maintenance downtime.
7. Conclusion
The integration of Low Carbon Silicon Carbide proved to be a strategic upgrade for the steel plant. It successfully decoupled the deoxidation process from carbon contamination, enabling the production of premium-grade steel with a lower environmental footprint. The case illustrates that in high-stakes steelmaking, selecting the specific ferro alloy chemistry is not just a material choice-it is a direct driver of operational profitability and quality assurance.
📧E-mail: goldenltd.silicon@gmail.com 📞WhatsApp: 86 16663721147
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