Silicon Carbon Alloy 68-18 – Ultra-Pure High Carbon Silicon (Si 68% min, C 18% min) for Specialty Steel
Premium silicon carbon alloy with minimum 68% silicon and 18% carbon, featuring ultra-low sulfur and phosphorus (≤0.03%, ≤0.04%). Designed for specialty steel, high-carbon applications, and critical metallurgical processes.
| Main Composition | Si 68% min, C 18% min, S ≤0.03%, P ≤0.04% (typical) |
| Form | Lumps (10-50mm), Granules (3-8mm), Powder (0-3mm, 0-10mm), Custom sizes available |
| Application | Specialty steel, high-carbon steel, tool steel, precision alloying, deoxidation |
| Standard | GB/T 2272-2020, ASTM A100, ISO 5445 (high-purity grade) |
Silicon Carbon Alloy 68-18 – Product Overview
Silicon Carbon Alloy 68-18 is a high-purity composite alloy containing minimum 68% silicon and 18% carbon, with exceptionally low sulfur (≤0.03%) and phosphorus (≤0.04%). It is produced through advanced refining processes using selected raw materials in modern submerged arc furnaces. This premium grade is specifically designed for specialty steel applications where impurity control is critical, combining high silicon content with elevated carbon levels for maximum metallurgical efficiency. It serves as the preferred choice for tool steel, high-carbon steel, and other demanding applications.
Product Core Advantages
- Ultra-High Purity: Extremely low S and P (≤0.03% and ≤0.04%) for critical steel grades.
- Maximum Silicon Content: Minimum 68% Si for superior deoxidation efficiency.
- High Carbon Value: 18% min carbon content reduces need for separate carburizers.
- Consistent Quality: Strict process control ensures batch-to-batch uniformity.
- Custom Sizing: Available in lumps, granules, or powder to match your specific process.
- Stable Supply: Produced in ISO 9001 certified facilities with dedicated quality management.
Typical Application Areas
Silicon Carbon Alloy 68-18 is essential in premium metallurgical processes:
- Specialty Steel Production: Ideal for tool steel, die steel, and high-carbon steel grades requiring tight impurity control.
- Precision Deoxidation: Efficiently removes oxygen while introducing minimal harmful residuals.
- High-Carbon Alloying: Simultaneously adds silicon and carbon to achieve target compositions in spring steel, rail steel, and wear-resistant steel.
- Electric Furnace Steelmaking: Used as a charge material for premium steel grades.
- Foundry Applications: Enhances properties of high-strength cast irons and steel castings.
- Substitute for FeSi + Carburizer: Combines two functions in one high-purity product.
For specific application guidance or custom formulations, contact our technical team for personalized recommendations based on your production requirements.
Technical Specifications – Silicon Carbon Alloy 68-18 & Common Grades
Our Silicon Carbon Alloy 68-18 is produced to meet international standards with strict quality control. Below is the chemical composition of our primary grade (68-18) compared with other common industrial grades for reference.
Chemical Composition (Typical Values, % by weight)
| Grade / Designation | Si (%) | C (%) | S (%) | P (%) | Typical Application |
|---|---|---|---|---|---|
| 68-18 | 68 min | 18 min | ≤0.03 | ≤0.04 | Specialty steel, high-carbon applications |
| 60-15 | 60 min | 15 min | ≤0.05 | ≤0.05 | General steelmaking, deoxidation |
| 65-15 | 65 min | 15 min | ≤0.05 | ≤0.05 | High-grade steel, precise alloying |
| 40-20 (0-8mm powder) | 40 min | 20 min | ≤0.05 | ≤0.05 | Powder injection, sintering |
| 50-20 (0-8mm powder) | 50 min | 20 min | ≤0.05 | ≤0.05 | Powder metallurgy, injection |
Physical Properties
| Property | Value | Unit |
|---|---|---|
| Melting Point | 1250-1350 | °C |
| Density (at 20°C) | 3.0-3.5 | g/cm³ |
| Appearance | Dark gray metallic lumps / granules / powder | - |
| Bulk Density (lumps) | 1.8-2.2 | g/cm³ |
Available Sizes
- Lumps: 10-50mm, 10-100mm, 50-100mm (standard), custom sizes available
- Granules: 3-8mm, 1-3mm
- Powder: 0-2mm, 0-10mm,
- Custom Sizes: Available upon request to meet specific process requirements
Application Guidelines – Silicon Carbon Alloy 68-18
Silicon Carbon Alloy 68-18 is a high-purity material with the following primary applications:
Specialty Steel Deoxidation & Alloying
Added during ladle refining or tapping of tool steel, die steel, and high-carbon steel grades. The ultra-low S and P levels ensure final steel meets strict impurity requirements. Typical addition: 1-8 kg per ton depending on target composition.
High-Carbon Steel Production
Ideal for grades requiring both silicon and carbon, such as spring steel (e.g., 60Si2Mn, 55SiCr), rail steel (U71Mn, U75V), and wear-resistant steel. The high carbon content reduces or eliminates need for separate carburizers.
Precision Alloying in Ladle Furnace
Used for fine-tuning silicon and carbon levels in the ladle furnace, offering excellent recovery and consistency. Particularly valuable for grades with narrow composition windows.
Foundry Applications for High-Performance Castings
In ductile iron and high-strength gray iron production, 68-18 improves nodularity and mechanical properties while maintaining low residuals.
Typical Addition Rates
Addition rates vary from 1 to 12 kg per ton depending on target specifications. Our technical team can assist with optimal sizing and addition practices for maximum recovery and purity preservation.
Packaging & Logistics – Silicon Carbon Alloy 68-18
Packaging Options
We offer various packaging solutions to meet different customer requirements and ensure product integrity during transportation, especially important for high-purity grades:
- 1‑ton Jumbo Bags: Common option, easy to handle with standard equipment.
- 25kg / 50kg Bags: For smaller orders or specific application requirements (e.g., laboratories, pilot plants).
- Custom Packaging: We can accommodate special packaging requests, including moisture-proof liners, vacuum packaging, or small drums to prevent contamination.
Logistics Information
| Parameter | Details |
|---|---|
| Minimum Order Quantity | 20 metric tons (less for trial orders, subject to availability) |
| Lead Time | 15-20 days after order confirmation |
| Port of Loading | Main Chinese ports (Tianjin, Shanghai, Qingdao, Huangpu) |
| Shipping Options | FOB, CIF, CFR, DAP (depending on destination) |
| Payment Terms | T/T, L/C at sight, or negotiable |
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Frequently Asked Questions – Silicon Carbon Alloy 68-18
What makes 68-18 different from standard silicon carbon alloys?
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68-18 offers higher silicon (68% min) and carbon (18% min) content combined with significantly lower sulfur (≤0.03%) and phosphorus (≤0.04%). This makes it suitable for specialty steel grades where impurity control is critical, such as tool steel, spring steel, and high-carbon steel requiring tight composition control.
Is it possible to entrust a third-party inspection to check the quality before shipment?
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Certainly, we support third-party inspections by internationally recognized quality inspection agencies such as SGS and BV to verify product quality before shipment. The inspection covers product appearance, weighing, dimensions, and chemical composition analysis. The entire inspection process will be documented with photos and written records, which will be provided to you together with the final inspection report. This ensures you have no concerns regarding product quality.
Can 68-18 be used in bearing steel production?
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Yes, the ultra-low S and P levels in 68-18 make it suitable for bearing steel (e.g., GCr15) and other demanding applications where non-metallic inclusion control is critical. We recommend discussing your specific requirements with our technical team.
What sizes are available for precision alloying?
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For precise ladle additions, we recommend granules in 3-8mm or 0-3mm range. For injection systems, powder in 0-2mm or 0-10mm is available. Custom sizing can be arranged to match your specific feeding equipment.
Do you provide material traceability and certification?
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Absolutely. Every batch of 68-18 is fully traceable from raw materials to finished product. We provide a detailed Certificate of Analysis (COA) with each shipment, and can arrange third-party inspection or additional testing upon request.
What is the typical recovery rate for silicon and carbon in steelmaking?
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With proper addition practices, silicon recovery typically ranges from 85-95%, and carbon recovery from 80-90%. Our technical team can provide recommendations to optimize recovery based on your specific furnace conditions and addition methods.
Why Choose Our Silicon Carbon(High Carbon Silicon)
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Different Grades of HC-Silicon(Si-C Alloy) Comparison
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