Ferro Silicon 70% – Versatile FeSi 70% for Steelmaking & Foundry Applications
High-quality Ferro Silicon with minimum 70% silicon content. Widely used as deoxidizer and alloying agent in carbon steel, stainless steel, and ductile iron production. Balanced impurity profile for consistent results.
| Main Composition | Si 70-72%, Al ≤2.0%, C ≤0.2%, P ≤0.04%, S ≤0.02% (typical impurities – fully customizable) |
| Form | Lumps (10-100mm), Granules (2-15mm), Powder (0-2mm, 0-10mm, -100 mesh, -200 mesh). Custom sizes available. |
| Application | Deoxidation in steelmaking, alloying agent in foundry (ductile iron), production of inoculants, welding materials |
| Standard | GB/T 2272-2020, ASTM A100, ISO 5445 (customizable) |
Ferro Silicon 70% – Product Overview
Ferro Silicon 70% (FeSi 70%) is a versatile master alloy with a silicon content between 70% and 72%. It is produced by carbothermic reduction of quartz and iron sources in submerged arc furnaces. Our Ferro Silicon 70% offers a well-balanced impurity profile making it suitable for a wide range of applications, from steel deoxidation to nodularizer production. It serves as an essential additive to improve the mechanical properties of steel and cast iron.
Product Core Advantages
- Optimal Purity: Minimum 70% Si with controlled impurities (Al, Ca, C) for consistent performance in critical metallurgical applications.
- Fully Customizable: Chemical composition and particle size can be tailored to match your specific melting or injection requirements.
- Versatile Application: Equally suitable for steelmaking (deoxidation), foundry (inoculation), and welding electrode production.
- Custom Sizing: Available in lumps, granules, or powder to optimize dissolution rate and recovery.
- Cost-Effective: Ideal balance of silicon content and impurity levels for general steel and iron production.
- Stable Supply: Produced in modern submerged arc furnaces with strict quality control from raw material to finished product.
Typical Application Areas
Ferro Silicon 70% is essential in many industrial processes:
- Steel Deoxidation: Added to molten steel to remove oxygen, prevent porosity, and improve ingot structure.
- Alloying Agent: Increases strength, hardness, and elasticity of steel and cast iron.
- Foundry Inoculation: Used in the production of inoculants for gray and ductile iron.
- Welding Electrodes: As a coating component or core wire alloy to improve weldability.
- Production of FeSiMg: Raw material for manufacturing nodularizers.
For specific application guidance or custom formulations, contact our technical team for personalized recommendations based on your production requirements.
Technical Specifications – Ferro Silicon Grades (Customizable)
Our Ferro Silicon is produced to meet international standards with strict quality control. Below is the chemical composition of our primary grades. All specifications (Si content, impurities, size) can be adjusted to your needs.
Chemical Composition (Typical Values, % by weight)
| Grade / Designation | Si (%) | Al (%) | C (%) | P (%) | S (%) | Other remarks |
|---|---|---|---|---|---|---|
| FeSi 70 | 70-72 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Standard grade, fully customizable |
| FeSi 65 | 65-70 | ≤3.0 | ≤0.5 | ≤0.04 | ≤0.02 | Cost-effective for bulk use |
| FeSi 72 | 72-74 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Preferred for nodulizers |
| FeSi 75 | 75-80 | ≤1.5 | ≤0.2 | ≤0.04 | ≤0.02 | High-purity steelmaking |
| FeSi 85 | 83-88 | ≤1.0 | ≤0.1 | ≤0.03 | ≤0.01 | Special alloys, high-end applications |
| High‑Purity FeSi 76-79 (Ultra‑low Al/B/Ti/C) |
76-79 | ≤0.01 | ≤0.015 | ≤0.015 | ≤0.003 | B≤0.002%, Ti≤0.02%, V≤0.003% – for grain-oriented electrical steels, high‑end alloys |
| FeSi 68 Powder | 65-72 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Fine powder for heavy media, welding |
* All values are typical and can be adjusted per customer request. Impurity limits (Al, Ca, C, etc.) are flexible depending on application.
Physical Properties
| Property | Value | Unit |
|---|---|---|
| Melting Point | 1250-1380 (varies with Si content) | °C |
| Density (at 20°C) | 3.0-5.0 (depending on Si%) | g/cm³ |
| Appearance | Silvery-gray metallic lumps / granules / powder | - |
| Bulk Density (lumps) | 2.5-3.5 | g/cm³ |
Available Sizes – Fully Customizable
- Lumps: 10-50mm, 10-100mm, 50-100mm (standard), any custom range available
- Granules: 2-15mm, 1-6mm, 0.2-1mm
- Powder: 0-2mm, 0-10mm, -20 mesh, -40 mesh, -100 mesh, -200 mesh, -325 mesh
- Custom Sizes: Available upon request to meet specific process requirements (injection, briquetting, etc.)
Application Guidelines – Ferro Silicon 70%
Ferro Silicon 70% is a versatile material with the following primary applications:
Steel Deoxidation & Alloying
Added to molten steel (typically in ladle or furnace) to remove oxygen, prevent blowholes, and improve mechanical properties. Our FeSi 70 provides consistent chemistry for predictable steel grades.
Foundry Inoculation
Used in the production of inoculants for gray and ductile iron to control graphite formation and improve mechanical properties. The balanced silicon content ensures effective inoculation without excessive silicon addition.
Production of Nodulizers (FeSiMg)
Raw material for manufacturing magnesium ferrosilicon alloys used in ductile iron production. The consistent chemistry ensures reliable magnesium recovery.
Welding Electrodes
Ground to fine powder and used in electrode coatings or as a core wire alloy to improve arc stability and weld metal properties.
Production of High-Purity Alloys
Ultra-low Al/B/Ti/C grade (76-79% Si) is specifically designed for grain-oriented electrical steels and specialty magnetic alloys.
Typical Addition Rates (Steel)
In steelmaking, addition rates typically range from 2 to 8 kg per ton of steel depending on the target silicon content and deoxidation practice. Our technical team can assist with optimal sizing and addition practices.
Packaging & Logistics – Ferro Silicon 70%
Packaging Options
We offer various packaging solutions to meet different customer requirements and ensure product integrity during transportation:
- 1‑ton Jumbo Bags: Common option, easy to handle with standard equipment.
- 25kg / 50kg Bags: For smaller orders or specific application requirements (e.g., foundries).
- Custom Packaging: We can accommodate special packaging requests, including moisture-proof liners, steel drums, or small boxes for powder.
Logistics Information
| Parameter | Details |
|---|---|
| Minimum Order Quantity | 20 metric tons (trial orders possible, 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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Access our technical documentation for detailed product information:
Frequently Asked Questions – Ferro Silicon 70%
What is the difference between Ferro Silicon 70% and lower/higher silicon grades?
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FeSi 70% contains 70-75% Si, offering a balance between silicon content and cost. Lower grades like FeSi 65% are more economical for bulk deoxidation, while higher grades like FeSi 75% are preferred when higher silicon addition or lower iron introduction is required. FeSi 70% is a versatile choice suitable for many steel and foundry applications.
Can you customize the aluminum (Al) content in Ferro Silicon 70%?
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Yes, absolutely. While our standard FeSi 70 has Al ≤1.5%, we can supply low-aluminum versions (e.g., Al ≤0.5%, ≤0.1%) depending on your steel or alloy specifications. For critical applications, we can also supply ultra-low Al grades.
What sizes are best for ladle addition in steelmaking?
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For ladle addition, lumps in the range of 10-50mm or 10-100mm are typically used to ensure good recovery and controlled dissolution. For injection, finer sizes (0.2-2mm) are preferred. We can supply any custom size to match your practice.
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.
Do you provide a certificate of analysis with each shipment?
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Absolutely. Every batch of Ferro Silicon is tested in our ISO 17025 accredited laboratory, and a Certificate of Analysis (COA) showing Si, Al, Ca, C, P, S, and other elements (B, Ti on request) is provided with the shipping documents.
What is your production capacity for Ferro Silicon 70%?
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We have an annual production capacity exceeding 80,000 metric tons of ferrosilicon across various grades, including FeSi 70, 65, 72, 75, 85, and high-purity specialties. We can accommodate both containerized and bulk vessel shipments.
Why Choose Our Ferro Silicon
20+ Years Experience
Specialized in ferroalloy production with deep industry knowledge
Strict Quality Control
Every batch tested to ensure consistent composition and performance
Global Delivery
Reliable logistics network ensuring timely delivery worldwide
Quality & Production Showcase
Explore our quality control process, production facilities, and customer interactions
Various Ferro Silicon Grades Comparison
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