Ferro Silicon 85% – High-Silicon FeSi 85% for Specialty Steels & Electrical Alloys
Premium Ferro Silicon with minimum 85% silicon content. Designed for high-end applications including electrical steels, stainless steels, and specialty cast irons where maximum silicon addition with minimal iron is required.
| Main Composition | Si 83-88%, Al ≤1.0%, Ca ≤0.5%, C ≤0.1%, P ≤0.03%, S ≤0.01% (typical impurities – fully customizable) |
| Form | Lumps (10-80mm),Custom sizes available. |
| Application | Electrical steels (grain-oriented/non-oriented), stainless steel production, high-silicon cast irons, deoxidizer for specialty alloys |
| Standard | GB/T 2272-2020, ASTM A100, ISO 5445 (customizable) |
Ferro Silicon 85% – Product Overview
Ferro Silicon 85% (FeSi 85%) is a high-silicon master alloy with a silicon content between 83% and 88%. It is produced by carbothermic reduction of high-purity quartz and iron sources in submerged arc furnaces. Our Ferro Silicon 85% offers a unique combination of high silicon content and controlled impurities, making it ideal for specialty applications where maximum silicon addition with minimal iron introduction is required.
Product Core Advantages
- High Silicon Content: Minimum 83% Si, allowing efficient silicon addition with minimal iron carryover.
- Low Impurities: Tightly controlled Al, Ca, C levels for demanding applications like electrical steels.
- Fully Customizable: Chemical composition and particle size can be tailored to match your specific requirements.
- Premium Quality: Produced from selected raw materials with strict process control.
- Custom Sizing: Available in lumps, granules, or powder to optimize dissolution rate and recovery.
- Stable Supply: Produced in modern submerged arc furnaces with strict quality control from raw material to finished product.
Typical Application Areas
Ferro Silicon 85% is essential in many high-end industrial processes:
- Electrical Steels: Primary silicon source for grain-oriented and non-oriented electrical steels used in transformers, motors, and generators.
- Stainless Steel Production: Alloying agent to adjust silicon content in austenitic and ferritic stainless steels.
- High-Silicon Cast Irons: Production of corrosion-resistant high-silicon cast irons.
- Specialty Alloys: Used in the production of magnetic alloys and other high-performance materials.
- Deoxidizer: For high-grade steel applications requiring minimal inclusion formation.
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 85 | 83-88 | ≤1.0 | ≤0.1 | ≤0.03 | ≤0.01 | High-silicon grade, fully customizable |
| FeSi 65 | 65-70 | ≤3.0 | ≤0.5 | ≤0.04 | ≤0.02 | Standard grade for bulk use |
| FeSi 70 | 70-72 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Versatile for steel/foundry |
| 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 |
| 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 | 1350-1420 (varies with Si content) | °C |
| Density (at 20°C) | 2.8-4.0 (depending on Si%) | g/cm³ |
| Appearance | Silvery-gray metallic lumps / granules / powder | - |
| Bulk Density (lumps) | 2.2-3.0 | 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 85%
Ferro Silicon 85% is a high-performance material with the following primary applications:
Electrical Steel Production
Primary silicon source for grain-oriented (GO) and non-oriented (NO) electrical steels. The high silicon content and low impurities are critical for achieving the desired magnetic properties and minimizing core losses in transformers and motors.
Stainless & Heat-Resistant Steels
Used to adjust silicon content in austenitic (e.g., 304, 316) and ferritic stainless steels, improving oxidation resistance and high-temperature strength.
High-Silicon Cast Irons
Production of corrosion-resistant high-silicon cast irons (e.g., 14-16% Si) used in pumps, valves, and chemical processing equipment.
Specialty Magnetic Alloys
Raw material for the production of magnetic alloys requiring high silicon content and extremely low impurities.
Deoxidizer for Premium Steels
For high-grade steel applications where minimal inclusion formation is required, FeSi 85 provides efficient deoxidation with minimal impurity introduction.
Typical Addition Rates
Addition rates vary widely depending on the target alloy. For electrical steels, addition rates typically range from 1.5% to 3.5% Si. Our technical team can assist with optimal sizing and addition practices for your specific application.
Packaging & Logistics – Ferro Silicon 85%
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.
- 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 |
Download Center
Access our technical documentation for detailed product information:
Frequently Asked Questions – Ferro Silicon 85%
What are the advantages of using Ferro Silicon 85% over lower silicon grades?
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FeSi 85% allows higher silicon addition with less material handling and lower iron introduction. This is particularly important in electrical steels and stainless steels where iron dilution must be minimized. The higher purity also reduces non-metallic inclusions in critical applications.
Can you supply Ferro Silicon 85% with extremely low aluminum for electrical steels?
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Yes, absolutely. While our standard FeSi 85 has Al ≤1.0%, we can supply low-aluminum versions (e.g., Al ≤0.1%, ≤0.05%) and even ultra-low Al grades (≤0.01%) for demanding electrical steel applications. Please discuss your specific requirements with our technical team.
What sizes are best for electrical steel production?
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For melting in electric arc furnaces or induction furnaces, lumps in the range of 10-50mm are typically used. For fine-tuning in ladle metallurgy, smaller granules or specific size fractions may be preferred. We can supply any custom size to match your process.
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 85%?
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We have an annual production capacity exceeding 80,000 metric tons of ferrosilicon across various grades, including FeSi 85, 65, 70, 72, 75, 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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