What Industries Use Silicon Carbide the Most?
Silicon carbide (SiC), especially black silicon carbide below 85% purity (70%, 75%, 80%, 85%), is widely used across industries that require high-temperature resistance, strong deoxidizing ability, wear resistance, and cost-efficient metallurgical performance. The largest consuming sectors are steelmaking, foundry casting, refractory materials, non-ferrous metallurgy, and abrasive processing industries, where SiC plays a critical role in improving product quality and reducing production cost.
Silicon Carbide (Below 85%) Specification Overview
| Grade | SiC Content (%) | Free Carbon (%) | SiO₂ (%) | Fe₂O₃ (%) | Grain Size | Density (g/cm³) | Main Industrial Use |
|---|---|---|---|---|---|---|---|
| SiC 85 | ≥85 | ≤3.0 | ≤5.0 | ≤0.5 | 0–1mm / 1–3mm | 1.40–1.55 | High-end metallurgy |
| SiC 80 | 80–84 | ≤4.0 | ≤6.0 | ≤0.6 | 0–5mm | 1.35–1.50 | Steel & refractory |
| SiC 75 | 75–79 | ≤5.0 | ≤7.0 | ≤0.8 | 0–10mm | 1.30–1.45 | Foundry industry |
| SiC 70 | 70–74 | ≤6.0 | ≤8.0 | ≤1.0 | Powder–10mm | 1.25–1.40 | Low-cost metallurgy |
Key Industries Using Silicon Carbide the Most
1. Steelmaking Industry (Largest Consumer)
Steel production is the largest application field for silicon carbide. SiC is widely used as a deoxidizer and alloying additive in electric arc furnaces and ladle refining processes. It helps remove oxygen, reduce impurities, and improve steel cleanliness. Lower-grade SiC (70–80%) is often preferred for cost-efficient steelmaking, while SiC 85% is used in higher-grade steels.
2. Foundry & Casting Industry
In iron casting, silicon carbide is used to improve graphite structure formation and molten iron quality. It enhances fluidity, reduces shrinkage defects, and improves mechanical strength of castings. SiC 75% is particularly common in gray iron and ductile iron production due to its balance between cost and performance.
3. Refractory Materials Industry
Silicon carbide is widely used in kiln furniture, refractory bricks, and high-temperature linings. Its excellent thermal stability and oxidation resistance make it ideal for furnace environments. SiC 80% and SiC 85% are commonly selected for better thermal shock resistance.
4. Non-Ferrous Metallurgy (Aluminum, Magnesium, Copper)
SiC is used in refining and smelting non-ferrous metals, especially in aluminum alloy production, where it helps improve melt quality and reduce oxidation losses. It also plays a role in magnesium production processes.
5. Abrasives & Grinding Industry
Silicon carbide is a key material for abrasive tools, grinding wheels, sandpaper, and cutting applications. Its high hardness makes it suitable for processing glass, ceramics, stone, and precision components. Finer SiC grades are widely used in polishing and surface finishing.
Grade Comparison (Industrial Performance Logic)
SiC 85 vs SiC 80
SiC 85 provides higher purity and better deoxidation efficiency, making it suitable for high-grade steel production and precision metallurgy. SiC 80 is more cost-effective and widely used in general steelmaking and refractory applications where cost control is important.
SiC 85 vs SiC 75
SiC 85 is used in high-performance steel and controlled metallurgical processes, while SiC 75 is widely used in foundry casting and gray iron production, offering a lower-cost alternative with acceptable performance.
SiC 80 vs SiC 70
SiC 80 provides more stable chemical behavior and better yield in steel furnaces. SiC 70 is a budget-grade industrial material, mainly used in large-volume applications where cost is the primary concern rather than purity.
Summary
Silicon carbide is a multi-industry industrial material, with its largest applications in steelmaking, foundry casting, refractories, non-ferrous metallurgy, and abrasives. Lower grades (70–80%) dominate cost-sensitive bulk metallurgy, while higher grades (85%) are used in more controlled and high-performance applications. Choosing the correct grade directly impacts production cost, efficiency, and final product quality.
FAQ – Silicon Carbide Industrial Applications
1. Which industry uses silicon carbide the most?
The steelmaking industry is the largest consumer of silicon carbide globally.
2. Why is SiC used in steel production?
It acts as a strong deoxidizer, improving steel purity and reducing oxygen-related defects.
3. What grade of SiC is used in foundries?
SiC 75% is commonly used in casting due to its balance of cost and performance.
4. Can silicon carbide be used in refractory materials?
Yes, SiC has excellent thermal resistance and is widely used in kiln furniture and furnace linings.
5. Is silicon carbide used in aluminum production?
Yes, it helps improve melt quality and reduces oxidation in non-ferrous metallurgy.
6. What is the main advantage of lower-grade SiC (70–80%)?
Lower-grade SiC offers cost efficiency for large-scale industrial metallurgy applications.
Call to Action – Factory Supply Silicon Carbide (Below 85%)
We supply black silicon carbide grades 70%, 75%, 80%, and 85%, optimized for steelmaking, foundry, and refractory industries with stable chemical composition and competitive factory pricing.
✔ Stable bulk supply for industrial users
✔ Controlled impurity and consistent grain size
✔ Export-ready packaging for global delivery