Ferro Silicon Products

Ferro silicon (FeSi) is an iron-silicon alloy with silicon content ranging from 15% to 90% depending on the grade. Our standard grades include:

• FeSi 65%: Si 65-70%, Al ≤3.0%, C ≤0.5% — cost-effective for bulk steelmaking deoxidation
• FeSi 72%: Si 72-74%, Al ≤2.0%, C ≤0.2% — preferred grade for nodulizer (FeSiMg) production
• FeSi 75%: Si 75-80%, Al ≤1.5%, C ≤0.2% — high-grade steelmaking, low impurities
• FeSi 85%: Si 83-88%, Al ≤1.0%, C ≤0.1% — specialty alloys & electrical steels
• High Purity FeSi 76-79%: Al ≤0.01%, B ≤0.002%, Ti ≤0.02% — grain-oriented electrical steels

All chemical compositions are fully customizable. A certificate of analysis (COA) is provided with every shipment.

Ferro silicon is widely used in the steel and foundry industries:

• Deoxidation in steelmaking: Removes oxygen from molten steel, preventing porosity and improving ingot quality
• Alloying agent: Adds silicon to steel and cast iron to increase strength, hardness, and magnetic properties
• Nodulizer production: Key raw material for FeSiMg alloys used in ductile iron production
• Inoculation in foundries: Controls graphite formation in gray and ductile iron castings
• Electrical steel manufacturing: High-purity grades are essential for transformer cores and motor laminations
• Welding electrode coatings: FeSi powder improves arc stability and weld quality
• Heavy media separation: FeSi powder is used in mining for mineral processing (coal, diamonds, iron ore)

Choosing the right FeSi grade depends on your specific process requirements:

• For bulk steelmaking deoxidation: FeSi 65% or FeSi 70% is usually sufficient and cost-effective
• For ductile iron / nodulizer production: FeSi 72% is preferred due to balanced silicon and controlled aluminum
• For high-grade / clean steel: FeSi 75% offers lower impurities (Al ≤1.5%) for reduced inclusions
• For electrical steels (GOES/NOES): High Purity FeSi 76-79% is required, with ultra-low Al, B, Ti, C
• For maximum silicon with minimum iron: FeSi 85% is ideal

Not sure which grade fits your application? Contact our technical team for a free consultation.

We supply ferro silicon in multiple size ranges, fully customizable to your process need:

• Lumps: 10-50mm, 10-100mm, 50-100mm — standard for furnace and ladle addition
• Granules: 2-15mm, 1-6mm, 3-10mm — for controlled dissolution and injection systems
• Powder: 0-2mm, -40 mesh, -100 mesh, -200 mesh, -325 mesh — for welding, heavy media separation, and chemical applications

Custom sizes are available upon request. Our ferro silicon lumps (10-50mm) are the most popular for steelmaking.

Ferro silicon price is influenced by several factors: silicon content grade (FeSi 65/72/75/85), quantity (MT), particle size, impurity requirements, packaging, and delivery terms (FOB/CIF). For the latest ferro silicon price per ton, please submit a quotation request with your specifications. We By email/whatsapp/wechat Reply within 2 hours(M-F 9:00-17:00 GTM+8) with a detailed offer including COA.

As a reliable ferro silicon supplier and manufacturer, we provide:

• Material Test Certificate (COA) — with chemical analysis (Si, Al, C, P, S) for every batch
• Third-party inspection — SGS, Bureau Veritas (BV), Intertek inspection is welcomed and fully supported before shipment
• Full material traceability — from raw material to final shipment with batch tracking documentation

Learn more about our quality control system on our Quality Control & Ferroalloy Inspection page.

The most commonly used ferro silicon lumps are 10-50 or 10-60mm for standard furnace and ladle addition. For larger furnaces, 10-100mm lumps may be preferred. The optimal size depends on your furnace type, addition method, and target dissolution rate. Contact our technical team for a personalized recommendation based on your steelmaking process.