High Purity Ferro Silicon – Ultra-Low Impurity FeSi 76-79% for Grain-Oriented Electrical Steels
Premium High Purity Ferro Silicon with exceptional impurity control: Al≤0.01%, B≤0.002%, Ti≤0.02%, C≤0.015%. Specifically engineered for grain-oriented electrical steels, high-permeability alloys, and other demanding metallurgical applications where purity is critical.
| Main Composition | Si 76-79%, Al ≤0.01%, Ca ≤0.05%, C ≤0.015%, B ≤0.002%, Ti ≤0.02%, P ≤0.02%, S ≤0.005% – fully customizable |
| Form | Lumps (10-50mm), Granules (2-15mm), Powder (0-2mm, -100 mesh). Custom sizes available with strict contamination control. |
| Application | Grain-oriented electrical steels (GOES), non-oriented electrical steels, high-permeability magnetic alloys, specialty stainless steels |
| Standard | Custom specifications exceeding GB/T 2272, ASTM A100, ISO 5445 |
High Purity Ferro Silicon – Product Overview
Our High Purity Ferro Silicon is a premium-grade master alloy with silicon content between 76% and 79%, distinguished by its exceptionally low impurity levels. It is produced through a specialized manufacturing process using selected high-purity raw materials and strict quality controls to minimize trace elements. This grade is specifically designed for the most demanding applications, including grain-oriented electrical steels (GOES), where elements like aluminum, boron, titanium, and carbon must be rigorously controlled to achieve optimal magnetic properties.
Product Core Advantages
- Ultra-Low Impurities: Guaranteed maximums: Al≤0.01%, B≤0.002%, Ti≤0.02%, C≤0.015% – critical for electrical steel performance.
- Consistent Quality: Produced under strict process control with testing in ISO 17025 accredited laboratories.
- Optimized Silicon Range: 76-79% Si provides the ideal balance for electrical steel production.
- Fully Customizable: Tighter impurity limits or specific particle sizes available upon request.
- Contamination-Free Processing: Dedicated production lines and handling procedures prevent cross-contamination.
- Technical Support: Our metallurgists can assist with optimizing your addition practices for maximum performance.
Typical Application Areas
High Purity Ferro Silicon is essential in advanced metallurgical processes:
- Grain-Oriented Electrical Steels (GOES): Used in transformer cores, where extremely low impurities are required to achieve high permeability and low core loss.
- Non-Oriented Electrical Steels: For motor and generator applications requiring consistent magnetic properties.
- High-Permeability Alloys: Production of specialty magnetic materials for sensitive electronic applications.
- Premium Stainless Steels: Where tight control of trace elements is required for corrosion resistance or formability.
- Aerospace & Specialty Alloys: Critical applications demanding the highest purity levels.
For specific application guidance or custom formulations, contact our technical team for personalized recommendations based on your production requirements.
Technical Specifications – High Purity Ferro Silicon & Other Grades (Customizable)
Our High Purity Ferro Silicon is produced to meet the most demanding specifications. Below is the chemical composition of our primary grades. All specifications (Si content, impurities, size) can be adjusted to your needs, with even tighter limits available upon request.
Chemical Composition (Typical Values, % by weight)
| Grade / Designation | Si (%) | Al (%) | C (%) | P (%) | S (%) | Other remarks |
|---|---|---|---|---|---|---|
| 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 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 |
| FeSi 85 | 83-88 | ≤1.0 | ≤0.1 | ≤0.03 | ≤0.01 | Special alloys, high-end applications |
| FeSi 68 Powder | 65-72 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Fine powder for heavy media, welding |
* High Purity grade includes additional guarantees: B≤0.002%, Ti≤0.02%. Tighter limits available upon request.
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, high purity surface | - |
| Bulk Density (lumps) | 2.2-3.0 | g/cm³ |
Available Sizes – Fully Customizable with Contamination Control
- Lumps: 10-50mm, 10-100mm, 50-100mm (standard), any custom range available
- Granules: 2-15mm, 1-6mm, 0.2-1mm
- Powder: 0-2mm, -40 mesh, -100 mesh, -200 mesh (with strict contamination control during milling)
- Custom Sizes: Available upon request to meet specific process requirements, with dedicated equipment to maintain purity
Application Guidelines – High Purity Ferro Silicon
High Purity Ferro Silicon is a critical material for advanced applications:
Grain-Oriented Electrical Steels (GOES)
In the production of GOES for transformer cores, impurity elements must be minimized to achieve the desired magnetic properties. Aluminum and titanium form fine precipitates that inhibit grain growth, while boron and carbon affect the secondary recrystallization process. Our High Purity FeSi ensures consistent, high-performance electrical steels with low core loss and high permeability.
Non-Oriented Electrical Steels
For motor and generator applications, consistent purity levels ensure uniform magnetic properties and minimize variations in performance across production batches.
High-Permeability Alloys
Specialty magnetic alloys used in sensors, shielding, and electronic components require extremely pure raw materials to achieve the desired permeability and low coercivity.
Premium Stainless & Specialty Steels
In applications requiring excellent surface finish, corrosion resistance, or formability (such as automotive trim or medical devices), tight control of trace elements is essential.
Aerospace & Defense Alloys
Critical components in aerospace and defense applications demand the highest purity levels to ensure reliability and performance under extreme conditions.
Typical Addition Rates (Electrical Steels)
For electrical steels, addition rates typically range from 1.5% to 3.5% Si depending on the target grade. Our technical team can assist with optimal sizing and addition practices to minimize contamination and maximize recovery.
Packaging & Logistics – High Purity Ferro Silicon
Packaging Options
We offer specialized packaging solutions to maintain the high purity of our product during transportation:
- 1‑ton Jumbo Bags with inner liner: Standard option with moisture-proof liner to prevent contamination.
- 25kg / 50kg sealed bags: For smaller orders or precise batching.
- Custom Packaging: We can accommodate special packaging requests, including clean-room grade packaging for the most demanding applications.
- Contamination Prevention: All packaging materials are selected to avoid introducing impurities.
Logistics Information
| Parameter | Details |
|---|---|
| Minimum Order Quantity | 10 metric tons (trial orders possible for qualification) |
| Lead Time | 20-25 days after order confirmation (additional time for strict quality control) |
| 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 – High Purity Ferro Silicon
Why are ultra-low Al, B, Ti, and C critical for grain-oriented electrical steels?
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In grain-oriented electrical steels, aluminum and titanium form fine nitride and carbide precipitates that inhibit the desired grain growth during secondary recrystallization. Boron can affect the grain boundary mobility, and carbon must be minimized to avoid magnetic aging. Controlling these elements to extremely low levels is essential for achieving high permeability and low core loss in transformer steels.
Can you supply even tighter impurity limits than those stated?
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Yes, absolutely. We can work with you to develop custom specifications with even lower limits, such as Al≤0.005%, B≤0.001%, Ti≤0.01%, depending on your requirements and volume. Please discuss your needs with our technical team.
How do you prevent contamination during production and handling?
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Our High Purity Ferro Silicon is produced using selected raw materials in dedicated furnaces. Subsequent crushing, screening, and packaging are performed in clean environments with strict protocols to avoid cross-contamination. We use stainless steel equipment where appropriate and regularly test for trace elements throughout the 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 including B and Ti?
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Absolutely. Every batch of High Purity Ferro Silicon is tested in our ISO 17025 accredited laboratory, and a comprehensive Certificate of Analysis (COA) showing Si, Al, Ca, C, P, S, B, Ti, and other elements as requested is provided with the shipping documents.
What is your production capacity for High Purity Ferro Silicon?
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We have an annual production capacity exceeding 20,000 metric tons of high purity ferrosilicon, with the ability to scale up based on customer demand. We can accommodate both containerized and bulk vessel shipments with appropriate contamination control measures.
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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