Ferro Silicon 72% – High-Quality FeSi 72% for Steelmaking & Nodulizer Production
Premium Ferro Silicon with minimum 72% silicon content. Widely used as deoxidizer, alloying agent in steel, and essential raw material for high-performance nodulizers (FeSiMg) in ductile iron.
| Main Composition | Si 72-74%, Al ≤2.0%, C ≤0.2%, P ≤0.04%, S ≤0.02% (typical impurities, fully customizable) |
| Form | Lumps (10-60mm), Granules (3-8mm,1-3mm), Powder (0-2mm, 0-10mm, -100 mesh, -200 mesh). Custom sizes available. |
| Application | Deoxidation in steelmaking, production of nodulizers (FeSiMg), alloying agent in foundry, welding materials |
| Standard | GB/T 2272-2020, ASTM A100, ISO 5445 |
Ferro Silicon 72% – Product Overview
Ferro Silicon 72% (FeSi 72%) is a premium master alloy with a silicon content between 72% and 74%. It is produced by carbothermic reduction of high-purity quartz and iron sources in submerged arc furnaces. Our Ferro Silicon 72% offers a well-balanced impurity profile making it particularly suitable for the production of nodulizers (FeSiMg) for ductile iron, as well as for high-grade steel deoxidation.
Product Core Advantages
- Optimized Purity: Minimum 72% Si with controlled impurities (Al, Ca, C) for consistent performance in critical metallurgical applications, especially nodulizer production.
- Fully Customizable: Chemical composition and particle size can be tailored to match your specific melting or injection requirements.
- Nodulizer Grade: Preferred silicon base for manufacturing high-performance magnesium ferrosilicon (FeSiMg) due to favorable impurity levels.
- 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 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 72% is essential in many industrial processes:
- Nodulizer Production: Primary raw material for manufacturing FeSiMg alloys used in ductile iron production.
- 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 directly as an inoculant or in complex inoculant blends.
- Welding Electrodes: As a coating component or core wire alloy to improve weldability.
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 72 | 72-74 | ≤2.0 | ≤0.2 | ≤0.04 | ≤0.02 | Preferred for nodulizers, 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 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, 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 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, nodulizer production, etc.)
Application Guidelines – Ferro Silicon 72%
Ferro Silicon 72% is a versatile material with the following primary applications:
Nodulizer (FeSiMg) Production
Due to its balanced silicon content and controlled impurities, FeSi 72% is the preferred base material for manufacturing magnesium ferrosilicon (FeSiMg) alloys used in the production of ductile iron. Consistent chemistry ensures reliable magnesium recovery and nodule formation.
Steel Deoxidation & Alloying
Added to molten steel (typically in ladle or furnace) to remove oxygen, prevent blowholes, and improve mechanical properties. Our FeSi 72 provides consistent chemistry for predictable steel grades.
Foundry Inoculation
Used directly as an inoculant or in complex inoculant blends to control graphite structure in gray and ductile iron, improving mechanical properties and reducing chill.
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 (Foundry)
In nodulizer production, FeSi 72 is typically melted with magnesium and other elements. In direct inoculation, addition rates range from 0.1% to 0.8% of molten iron weight. Our technical team can assist with optimal sizing and addition practices.
Packaging & Logistics – Ferro Silicon 72%
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 72%
Why is Ferro Silicon 72% often preferred for nodulizer (FeSiMg) production?
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FeSi 72% offers an excellent balance of silicon content (72-78%) and controlled impurities, particularly aluminum and calcium, which are important for magnesium recovery and nodule formation in ductile iron. The silicon level is high enough to provide the necessary heat and fluidity during magnesium addition, while impurities are kept low to avoid dross and inclusions.
Can you supply Ferro Silicon 72% with very low aluminum for special nodulizer requirements?
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Yes, absolutely. While our standard FeSi 72 has Al ≤1.2%, we can supply low-aluminum versions (e.g., Al ≤0.5%, ≤0.1%, or even ≤0.05%) depending on your nodulizer specifications and final ductile iron quality requirements.
What sizes are best for FeSiMg production?
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For melting with magnesium, lumps in the range of 10-50mm or 10-100mm are typically used. However, we can supply any custom size depending on your melting furnace and process. For direct inoculation, smaller granules or specific size fractions are available.
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 72%?
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We have an annual production capacity exceeding 80,000 metric tons of ferrosilicon across various grades, including FeSi 72, 65, 70, 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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