Ferro Silicon 75% – High-Purity FeSi 75% for Advanced Steelmaking & Alloys
Premium Ferro Silicon with minimum 75% silicon content and low impurities. Ideal for high-grade steel deoxidation, production of electrical steels, and specialty cast irons.
| Main Composition | Si 75-80%, Al ≤1.5%, C ≤0.2%, P ≤0.03%, S ≤0.003% (typical impurities, fully customizable) |
| Form | Lumps (10-50mm), Granules (3-10mm), Powder (0-2mm, 0-10mm, -100 mesh, -200 mesh). Custom sizes available. |
| Application | Deoxidation in high-grade steelmaking, production of electrical steels, alloying agent in stainless steel, foundry inoculants |
| Standard | GB/T 2272-2020, ASTM A100, ISO 5445 |
Ferro Silicon 75% – Product Overview
Ferro Silicon 75% (FeSi 75%) is a high-grade master alloy with a silicon content between 75% and 80%. It is produced by carbothermic reduction of high-purity quartz and iron sources in submerged arc furnaces. Our Ferro Silicon 75% offers a well-balanced impurity profile with lower aluminum and calcium, making it particularly suitable for high-grade steel deoxidation, electrical steel production, and applications requiring minimal non-metallic inclusions.
Product Core Advantages
- High Purity: Minimum 75% Si with tightly controlled impurities (Al ≤1.5%, C ≤0.2%) 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.
- Low Impurity: Lower Al and Ca content reduces slag formation and improves steel cleanliness.
- Custom Sizing: Available in lumps, granules, or powder to optimize dissolution rate and recovery.
- High Silicon Content: Ideal for applications where maximum silicon addition with minimal iron introduction is desired.
- Stable Supply: Produced in modern submerged arc furnaces with strict quality control from raw material to finished product.
Typical Application Areas
Ferro Silicon 75% is essential in many industrial processes:
- High-Grade Steel Deoxidation: Added to molten steel for efficient oxygen removal with minimal impurity introduction.
- Electrical Steels (Grain-Oriented & Non-Oriented): Primary silicon source for silicon steels used in transformers and motors.
- Stainless Steel Production: Alloying agent to improve oxidation resistance and mechanical properties.
- Specialty Cast Irons: Used in the production of high-silicon cast irons with enhanced corrosion resistance.
- Welding Electrodes & Fluxes: As a coating component or core wire alloy.
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 75 | 75-80 | ≤1.5 | ≤0.2 | ≤0.04 | ≤0.02 | High-purity steelmaking, 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 | Higher Si for special alloys |
| FeSi 72 | 72-74 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Preferred for nodulizers |
| FeSi 85 | 83-88 | ≤1.0 | ≤0.1 | ≤0.03 | ≤0.01 | Special alloys, FeSiMg |
| 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 injection, 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 | 1300-1400 (varies with Si content) | °C |
| Density (at 20°C) | 2.8-4.5 (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 75%
Ferro Silicon 75% is a versatile material with the following primary applications:
High-Grade Steel Deoxidation
Added to molten steel (typically in ladle or furnace) for efficient oxygen removal. The higher silicon content and lower impurities make FeSi 75 ideal for clean steel production where non-metallic inclusions must be minimized.
Electrical Steel Production
Primary silicon source for grain-oriented and non-oriented electrical steels used in transformer cores, motors, and generators. Our FeSi 75 can be supplied with extremely low Al, Ti, and B for these demanding applications.
Stainless & Specialty Steel Alloying
Used to adjust silicon content in stainless steels and heat-resistant alloys, improving oxidation resistance and high-temperature strength.
Foundry Inoculants
Base material for high-performance inoculants used in gray and ductile iron production, particularly when low aluminum content is required.
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 1 to 6 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 75%
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 |
Download Center
Access our technical documentation for detailed product information:
Frequently Asked Questions – Ferro Silicon 75%
What is the advantage of using Ferro Silicon 75% over lower silicon grades?
+
FeSi 75% offers higher silicon content per unit weight, which means less material handling and lower iron introduction into the steel. It also typically has lower impurity levels (Al, Ca, C), making it preferred for clean steel applications and electrical steels where tight chemistry control is required.
Can you supply Ferro Silicon 75% with extremely low aluminum and titanium for electrical steels?
+
Yes, absolutely. Our high-purity FeSi 76-79 grade offers Al ≤0.01%, B ≤0.002%, Ti ≤0.02%, and C ≤0.015%, specifically designed for grain-oriented electrical steels and other demanding applications. We can tailor the chemistry to your exact specifications.
What sizes are best for ladle injection in steelmaking?
+
For injection, fine granules or powder in the range of 0.2-1mm or 0-2mm are typically used to ensure rapid dissolution and consistent feeding. We can supply any custom size distribution to match your injection equipment.
Is it possible to entrust a third-party inspection to check the quality before shipment?
+
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?
+
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 75%?
+
We have an annual production capacity exceeding 80,000 metric tons of ferrosilicon across various grades, including FeSi 75, 65, 70, 72, 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
Loading product overview...
Related Products
Ferro Silicon Barium Inoculant
Barium 1-2%,2-4%,4-6%,Calcium 0.6-2.5% available in 0.2-0.8mm,1-3mm,3-10mm and more sizes.
View Details
Silicon Calcium
Si60/Ca30, Si58/Ca30,customizable chemistries (Ca 20-32%, Si 50-60%) with lump (10-50mm) and powder (0-3mm,0-2mm) options.
View DetailsReady to Order or Need More Information?
Contact our technical sales team for pricing, samples, or application advice tailored to your specific needs.
Contact Us Today