Looking for a cost-effective deoxidizer or refractory aggregate? 70% black silicon carbide offers excellent physical hardness and thermal stability, reducing comprehensive smelting costs by 15%-20%. Factory direct supply, free samples available!
70% Black Silicon Carbide Industry Application Guide
1. What is 70% Black Silicon Carbide?
70% Black Silicon Carbide is an industrial-grade silicon carbide synthesized through high-temperature smelting in a resistance furnace, using high-quality quartz sand and petroleum coke as basic raw materials. With a SiC content controlled at 70% and above, it is an economical, medium-purity raw material specifically designed for bulk industrial production.
Compared to high-purity grades above 90%, the procurement cost of 70% silicon carbide can typically be reduced by about 30% - 40%. While ensuring core physical and chemical properties, it is the optimal solution for balancing "process compliance" and "procurement cost reduction" in the fields of metallurgical deoxidation, basic refractory materials, and conventional surface treatment.
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2. Core Physical & Chemical Properties and Performance Data
Why is it perfectly competent for conventional industrial needs? The following core data is its foundation:
- Excellent Physical Hardness: The Mohs hardness is stable between 9.1 - 9.2, and the microhardness can reach 2800-3300 kg/mm². It possesses strong microscopic cutting ability, and its grinding efficiency is more than 1.5 times that of ordinary corundum.
- Outstanding Thermal Shock Stability: Silicon carbide sublimates and decomposes only at around 2700°C. It maintains excellent volume stability in the conventional smelting and industrial kiln high-temperature environments of 1400°C - 1600°C.
- Significant Exothermic Effect: During the deoxidation process of molten steel, the oxidation reaction of silicon carbide releases a large amount of heat. Measured data shows that every 1 ton of silicon carbide added can increase the local molten steel temperature by 10°C - 15°C, significantly shortening the smelting time.
3. Core Application Fields and Process Performance
1. Metallurgical Steelmaking: Efficient and Economical Composite Deoxidizer (Accounting for about 60% of market usage)
- Efficient Replacement, Direct Cost Reduction: In converter/electric arc furnace steelmaking, 1 ton of 70% silicon carbide can roughly replace 0.4 - 0.5 tons of 75% ferrosilicon powder and some carbon raisers, reducing comprehensive deoxidation costs by 15% - 20%.
- Purifying Molten Steel and Increasing Yield: Compared to traditional aluminum deoxidation, it can reduce non-metallic inclusions in molten steel by about 10% - 15%. The alloy yield after deoxidation is typically increased by 2% - 5%.
- Saving Electricity Consumption: Thanks to the exothermic effect during deoxidation, an average of 15 - 30 kWh of electricity can be saved per ton of steel.
2. Refractory Materials: High-Quality Aggregate for Medium-to-Low Grade Refractories
Adding 10% - 15% of 70% silicon carbide to ordinary clay bricks or high-alumina bricks can significantly enhance their thermal shock resistance and wear resistance. This extends the average service life of parts such as kiln door linings and iron runners by 20% - 30%.
3. Abrasives and Surface Treatment: Conventional Shot Blasting and Sandblasting
As a sandblasting rust removal medium, it can be recycled 3 - 5 times. When achieving the same rust removal grade (e.g., Sa2.5), its material consumption is 40% lower than traditional quartz sand.
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4. Selection Guide: Applicable Scenarios vs. Scenarios to Avoid
To ensure production safety and product quality, enterprises need to clarify the application boundaries when purchasing:
✅ Preferred Scenarios: Bulk ordinary steel smelting deoxidation, conventional foundry sand mixing (addition amount is usually 1% - 3%), low-grade refractory brick/castable production, rough grinding of hardware, and ordinary sandblasting rust removal.
❌ Scenarios to Avoid: Aerospace-grade special alloy smelting (extremely sensitive to trace impurities), ultra-high-purity precision ceramic sintering that requires extremely high standards, and semiconductor wafer polishing (for these, high-purity micro-powder with SiC≥98% should be selected).
5. Procurement Pitfall Avoidance Guide (Advice for Purchasing Managers)
When sourcing and bulk purchasing 70% black silicon carbide, it is recommended to focus on evaluating the following dimensions:
- Reject the "Lowest Price Only" Mindset: The market is a mixed bag. You must require a third-party test report (like SGS) to confirm the true SiC content is ≥70%, avoiding buying severely adulterated inferior "silicon carbide mud".
- Particle Size Customization Capability: Metallurgical deoxidation often prefers 0-10mm (accounting for about 80%), while refractories and sandblasting require fine 1-3mm or 3-5mm. Give priority to factory-direct supplies equipped with their own screening workshops.
- Supply Chain Stability: For bulk projects purchasing over 100 tons at a time, be sure to inspect the factory's monthly capacity reserve and the physical strength of the moisture-proof jumbo bags (1MT Jumbo Bag) to avoid damage and moisture during transportation.
Ready to Reduce Your Industrial Raw Material Costs?
As a source factory of silicon carbide with a complete screening system, we not only provide 70% black silicon carbide with stable indicators, but also provide selection advice and customized particle size services based on your actual production process.
✔️ Support 1 ton Minimum Order Quantity (MOQ: 1 Ton)
✔️ Support SGS third-party purity and particle size testing
✔️ Stable monthly production capacity, guaranteeing on-time delivery for long-term bulk orders
[Send your specific requirements (application, particle size, monthly purchase volume), and our technical sales team will provide you with a customized FOB/CIF quotation including sea freight within 12 hours!]
70% Black Silicon Carbide (0-10mm) FAQ
Q:What is 70% black silicon carbide (0-10mm) used for?
A:It is mainly used for metallurgical deoxidation, medium-grade refractory materials, general abrasives, sandblasting, foundry additives, and anti-slip flooring. It is the most cost-effective choice for bulk industrial users.
Q:What is the SiC content of your 70% black silicon carbide?
A:Our 70% black silicon carbide has a minimum SiC content of 70%, with strictly controlled impurities to ensure stable performance in industrial applications.
Q:What particle sizes do you supply?
A:We provide 0-10mm, 1-3mm, 3-5mm, 5-8mm and other conventional sizes. Custom particle size distribution is also available for bulk orders.
Q:Is 70% SiC suitable for steelmaking deoxidizer?
A:Yes. It is widely used as a deoxidizer in steelmaking and foundry, effectively reducing oxygen content and lowering raw material costs compared with high-purity SiC.
Q:What is the difference between 70% SiC and 85% SiC?
A:70% SiC is more cost-effective, ideal for conventional industrial use. 85% SiC has higher purity and better performance, suitable for high-temperature and high-demand scenarios.
Q:Can I get a free sample for testing?
A:Yes, we provide free samples for quality verification before bulk orders.
Q:What is your MOQ for 70% black silicon carbide?
A:Our MOQ is 1 ton. We also support full-container orders and long-term contract supply.
Q:Do you provide SGS or third-party test reports?
A:Yes, we can provide SGS test reports and factory inspection reports to confirm SiC content, impurities, and particle size.
Q:What packaging do you use for export?
A:We use 25kg, 50kg bags, and 1000kg jumbo bags, which meet international shipping standards.
Q:What trade terms do you accept?
A:We mainly accept FOB and can also support CFR, CIF, and other terms according to customer requirements.
