Ferro Silicon
What Is Ferrosilicon?
Ferrosilicon (FeSi) is an iron-silicon ferroalloy produced by reducing silica with carbon materials in the presence of an iron source in an electric furnace. Commercial ferrosilicon is supplied in different silicon grades, including FeSi45, FeSi65, FeSi70, FeSi72 and FeSi75, as well as lump, granule and powder forms.
ZhenAn is a China ferrosilicon supplier providing FeSi45, FeSi65, FeSi70, FeSi72 and FeSi75 for steelmaking, foundry, magnesium production and other metallurgical applications. Chemical composition, particle size, packing and batch inspection requirements can be confirmed according to the purchase specification before shipment.
Ferrosilicon Grades and Chemical Composition
Ferrosilicon (FeSi) is an iron-silicon alloy used mainly as a deoxidizer, alloying addition and reducing agent in metallurgical production. We supply FeSi45, FeSi65, FeSi70, FeSi72 and FeSi75 in lump, granule and powder forms.
Ferrosilicon grades are mainly distinguished by silicon content, but Al, Ca, Mn, Cr, P, S, C and particle size should also be checked against the final production specification.
| Grade | ≥ | (Chemical composition)≤ % | ||||||
| Si | Al | Ca | Mn | Cr | P | S | C | |
| FeSi75 | 75 | 1.5 | 1 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
| FeSi72 | 72 | 2 | 1 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
| FeSi70 | 70 | 2 | 1 | 0.6 | 0.5 | 0.04 | 0.02 | 0.2 |
| FeSi65 | 64.47 | 2.35 | 1 | 0.8 | 0.5 | 0.014 | <0.003 | 0.23 |
| FeSi45 | 45-47 | 2 | 1 | 0.8 | 0.5 | 0.04 | 0.02 | 0.2 |
| Size | 10-50mm, 0-3mm, 1-3mm, 0-10mm or custom particle size according to order requirements. | |||||||
Final chemical composition, particle-size tolerance and fines requirements should be confirmed according to the purchase specification.
Ferrosilicon Supply Options
Multiple Grades
Available grades include FeSi45, FeSi65, FeSi70, FeSi72 and FeSi75. Different silicon levels can be matched to different metallurgical specifications.
Lump, Granule and Powder
Ferrosilicon can be supplied as lump, granule or powder. Common particle sizes include 10-50mm, 0-10mm, 1-3mm and 0-3mm, with other sizes available according to the order specification.
Chemical Composition Control
Si content and agreed impurity limits such as Al, Ca, Mn, Cr, P, S and C can be checked by batch before shipment.
Custom Order Specification
Grade, particle size, packing and inspection requirements can be confirmed according to your purchase specification before production and shipment.
How to Choose the Right Ferrosilicon Grade
1. Silicon Content
Start with the Si content required by your production specification. FeSi75 and FeSi72 are common high-silicon grades, while FeSi70, FeSi65 and FeSi45 are used when a lower silicon level is required.
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2. Impurity Limits
Check Al, Ca, C, P, S and other specified impurity limits together with Si content. Two ferrosilicon products with similar silicon content may still have different requirements for a particular smelting process.
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3. Particle Size
Select the particle size according to feeding and handling requirements. Common options include 10-50mm lump, 0-10mm small-sized material, 1-3mm granule and 0-3mm fine granule.
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4. Application
For steelmaking, Si content, Al/Ca limits and lump size are usually important. Foundry applications may require a different grade or particle size. Magnesium production and other ferroalloy processes should be matched to the required high-Si specification.
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Ferrosilicon Forms and Custom Sizes
Ferrosilicon is available as lump, granule and powder. The main difference is particle size, which affects handling, feeding, mixing and reaction behavior during use. ZhenAn can supply standard sizes or screen the material according to the required particle-size range.
Ferrosilicon Lumps
Ferrosilicon lump is the standard form for bulk metallurgical addition. Compared with finer material, lumps generate less dust during handling and are easier to store, transport and charge into the furnace or ladle. A common size is 10-50mm, with other screened sizes available according to the feeding system and purchase specification.
Ferrosilicon Granules
Ferrosilicon granules have a smaller and more uniform particle size than lump material. Their larger surface area allows faster contact with molten metal, while controlled sizing makes weighing, feeding and batch addition easier to manage. Common ranges include 1-3mm, 0-3mm and 0-10mm.
Ferrosilicon Powder
Ferrosilicon powder has the finest particle size and the largest surface area of the three forms. It is easier to blend uniformly with other powdered materials and is suitable for processes that require fine particle size, controlled dosing or consistent mixing. The required mesh or particle-size distribution should be confirmed before production.
Steelmaking: Ferrosilicon is used as a deoxidizer and alloying addition in steel production. Grade selection normally depends on Si content, impurity limits and lump size required by the steel specification.
Foundry: Ferrosilicon can be used as a silicon addition in cast iron and foundry processes. Particle size and chemical composition should be matched to the required treatment method.
Magnesium Production: High-silicon ferrosilicon is used as a reducing agent in the Pidgeon process for primary magnesium production. The required Si content and impurity limits should be confirmed before purchasing.
Ferroalloy Production: Ferrosilicon can also be used as a reducing agent or silicon source in the production of other ferroalloys. The appropriate grade depends on the target alloy chemistry and permitted impurity limits.
How Is Ferrosilicon Produced?
- Raw materials: Ferrosilicon production uses silica, carbon materials and an iron source as the main furnace charge.
- Smelting: The raw materials are smelted at high temperature in an electric furnace. Silica is reduced and silicon combines with iron to form the Fe-Si alloy.
- Tapping and cooling: Molten ferrosilicon is tapped from the furnace and cooled before further processing.
- Crushing and sizing: After cooling, the alloy is crushed and screened into lump, granule or powder according to the required particle-size range.
Raw-material quality, furnace operation and process control affect the final silicon content and impurity levels. A separate technical article can cover raw materials, furnace reactions, tapping, cooling and sizing in more detail.
Ferrosilicon Quality Inspection and Export Support
Chemical Composition Inspection
- Si content and agreed impurity limits can be checked by batch.
- Typical inspection items include Al, Ca, Mn, Cr, P, S and C according to grade requirements.
Particle Size Inspection
- Lump, granule and powder orders can be checked against the agreed particle-size range.
- Fines or oversize limits can be confirmed when they are included in the purchase specification.
Batch Documents
- COA or chemical analysis can be confirmed according to the order requirement.
- MTC, MSDS, packing documents, loading photos and other agreed export documents can be discussed before shipment.
Export Order Support
- Grade, size, packing and shipment requirements can be confirmed before production.
- FOB, CFR or CIF quotation terms can be confirmed according to the destination and shipment plan.
Ferrosilicon Packing and Export Supply
Ferrosilicon packing and delivery requirements should be confirmed together with the grade, form, particle size and order quantity. ZhenAn can prepare standard or agreed custom export packing according to the shipment requirement.
| Order Item | Supply Information |
| Grades | FeSi45 / FeSi65 / FeSi70 / FeSi72 / FeSi75 |
| Forms | Lump / Granule / Powder |
| Particle Size | Standard or custom size according to order specification |
| Packing | Standard export packing or agreed custom packing |
| Inspection | Batch chemical composition and particle-size inspection according to agreed requirements |
| Documents | COA / MTC / MSDS / packing documents as agreed |
| Trade Terms | FOB / CFR / CIF |
For CFR or CIF quotations, send the destination port together with the required grade, particle size and quantity.
Ferrosilicon Packing in Jumbo Bags
Ferrosilicon Export Packing and Warehouse Storage
Ferrosilicon Lumps for Export Supply
Ferrosilicon Production and Supply Capacity
150,000+
Annual Production & Sales
30,000
m² Production Area
Since 1993
Metallurgical Supply Experience
Quality and Export Certifications
Ferrosilicon Customer Visits and Factory Inspection
ZhenAn welcomes customers to review production, product inspection, packing and loading arrangements when a factory visit or pre-shipment verification is required.
FAQ About Ferrosilicon
Q: What is ferrosilicon?
A: Ferrosilicon is an iron-silicon ferroalloy produced by reducing silica with carbon materials in the presence of an iron source at high temperature. Commercial grades are mainly distinguished by silicon content, such as FeSi45, FeSi65, FeSi72 and FeSi75.
Q: What grades of ferrosilicon does ZhenAn supply?
A: ZhenAn supplies FeSi45, FeSi65, FeSi70, FeSi72 and FeSi75. The final grade should be selected according to the required Si content, impurity limits, application and particle size.
Q: What is the difference between FeSi72 and FeSi75?
A: FeSi72 has a standard minimum silicon content of 72%, while FeSi75 has a minimum Si content of 75% in the specifications shown on this page. FeSi75 also has a lower standard Al limit. The correct grade depends on the required production specification.
Q: What sizes of ferrosilicon are available?
A: Common sizes include 10-50mm, 0-10mm, 1-3mm and 0-3mm. Ferrosilicon can also be supplied as lump, granule or powder, with custom particle-size requirements confirmed before ordering.
Q: What is ferrosilicon used for?
A: Ferrosilicon is mainly used as a deoxidizer and alloying addition in steelmaking, as a silicon addition in foundry processes, and as a reducing agent in magnesium and ferroalloy production.
Q: How is ferrosilicon produced?
A: Ferrosilicon is produced by reducing silica with carbon materials in the presence of an iron source in an electric furnace. After smelting, the alloy is tapped, cooled, crushed and screened into the required particle size.
Q: Can ZhenAn provide a COA for ferrosilicon?
A: Yes. Batch chemical composition documents can be confirmed according to the order requirement. Additional documents such as MTC, MSDS, packing information and other agreed export documents can also be discussed before shipment.
Q: How can I get the current ferrosilicon price?
A: Send the required grade, chemical specification, particle size, quantity and destination port. Ferrosilicon prices vary with grade, specification, size, order quantity and current market conditions, so the final quotation should be confirmed for the specific order.