Ferro Silicon

Ferro Silicon Manufacturer

We manufacture and export premium Ferro Silicon (FeSi 45%, 65%, 70%, 72%, 75%, Low Aluminum FeSi, and Foundry Inoculants) for steelmaking, iron casting, and magnesium production. With over 31 years of manufacturing experience, strict quality control, customizable specifications, and global export capability, we deliver consistent ferroalloy solutions that meet the demanding requirements of steel mills, foundries, and metallurgical plants worldwide.

Ferro Silicon 72

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Low Aluminum Ferro Silicon

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Ferro Silicon 45

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Ferro Silicon Lump

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High Purity Ferro Silicon

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Ferro Silicon 75

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Ferro Silicon 65

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Polycrystalline Silicon

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TYPICAL SPECIFICATION

Grade		Chemical Composition(%)
		Si	C	Al	P	S
		≥	≤
Regular Specs	FeSi 65%	65	0.2	2	0.04	0.02
	FeSi 70%	70	0.2	2	0.04	0.02
	FeSi 72%	72	0.2	2	0.04	0.02
	FeSi 75%	75	0.2	2	0.04	0.02
Low Al	FeSi 75%	75	0.2	0.5	0.04	0.02
Size:10-50 mm,10-100mm
Other chemical composition and size can be supplied upon request.
Grade		Chemical Composition(%)
		Si	C	Al	P	S
		≥	≤
Specs	FeSi 65%	65	0.35	3.5	0.04	0.03
	FeSi 70%	70	0.35	3.5	0.04	0.03
	FeSi 45%	43-47	0.35	3.5	0.04	0.03
Size: 10-100mm , Packing in 1MT P.P Bags

Ferro Silicon Product Categories

Ferro Silicon 75% (FeSi 75)

Overview: The standard deoxidizing and alloying agent used in primary and secondary steelmaking.

Key Specs: Si: 75.0% min | Al: 1.5% max | C: 0.2% max | P: 0.04% max | S: 0.02% max

Best For: Carbon steel, stainless steel, structural steel, and silicon steel production.

Ferro Silicon 72% (FeSi 72)

Overview: A cost-effective ferroalloy option offering ideal performance for iron foundries and commercial steel production.

Key Specs: Si: 72.0% min | Al: 2.0% max | C: 0.2% max | P: 0.04% max | S: 0.02% max

Best For: Gray and ductile iron foundries, basic oxygen furnace (BOF) steelmaking.

Low-Aluminum / High-Purity Ferro Silicon

Overview: Specially refined grade with strictly controlled low aluminum and low carbon content to prevent nozzle clogging and inclusions in special steel.

Key Specs: Si: 75.0% min | Al: ≤0.1%, ≤0.2%, or ≤0.5% | Ti: ≤0.05% max

Best For: Electrical steel (silicon steel), automobile sheet metal, tire cord steel, and high-purity alloy steels.

Ferro Silicon Inoculants & Granules

Overview: Precisely crushed and sized FeSi granules treated with trace inoculating elements for foundry ladle addition.

Key Specs: Size: 0.2–0.7 mm, 1–3 mm, 3–8 mm | Customized Ba, Ca, or Zr additions available.

Best For: Graphite nucleation control and chill reduction in ductile and gray iron casting.

Applications by Industry

Carbon Steel Production
Typical Projects
Structural steel
Rebar production
Wire rod manufacturing
Steel billets
Steel blooms
Continuous casting plants

Recommended Grade
FeSi 75%
Size: 10–50 mm or 10–100 mm

Benefits
Efficient deoxidation during steelmaking
Improved silicon recovery
Reduced oxygen content in molten steel
Better mechanical properties and steel cleanliness
Stable melting performance in BOF and EAF operations

Stainless Steel & Special Alloy Steel
Typical Projects
Stainless steel
Tool steel
Bearing steel
Spring steel
High-strength alloy steel

Recommended Grade
FeSi 75%
Low Aluminum Ferro Silicon

Benefits
Low impurity levels
Reduced non-metallic inclusions
Improved alloy composition control
Better casting quality
Suitable for demanding metallurgical applications

OEM & Custom Manufacturing

Customization Item	Available Options
Silicon Content	FeSi 45%, 65%, 70%, 72%, 75%, or customized grades
Aluminum Content	Standard, Low Al (≤0.5%), Ultra Low Al (≤0.2% / ≤0.1%)
Carbon Content	Customized according to application requirements
Trace Elements	Controlled Ti, Ca, Ba, Zr and other elements upon request
Particle Size	Powder, Granules, 0–3 mm, 1–3 mm, 3–8 mm, 10–50 mm, 10–100 mm, or customized sizes
Packaging	25 kg bags, 1 MT FIBC bags, 1.25 MT jumbo bags, palletized packaging, or customized solutions
Private Label	Customer logo, customized labels, and packaging markings available
Inspection Standard	In-house testing, SGS, BV, CCIC, or customer-specified third-party inspection

How to Choose the Right Ferro Silicon Grade

Grade Selection Guide

For Electrical & Automotive Steels: Choose Low-Al Ferro Silicon (Al ≤ 0.1–0.5%). High aluminum levels cause alumina inclusions and nozzle clogging during continuous casting.

For Standard Carbon & Stainless Steelmaking: Choose Standard FeSi 75%. It delivers high silicon recovery rates and predictable deoxidation thermodynamics.

For Iron Foundries (Ladle Addition): Choose FeSi 72% or Sized FeSi Granules (1–3mm) for uniform dissolution and optimal graphite nucleation without excessive slag generation.

Sizing Distribution & Melting Efficiency

10–50 mm / 10–100 mm: Recommended for EAF/BOF steelmaking furnace charges to ensure proper penetration into liquid metal and avoid oxidation in the slag layer.

1–3 mm / 3–8 mm: Recommended for foundry ladle additions to achieve rapid dissolution and minimal temperature drop.

Manufacturing Process

Raw Material Sourcing & Preparation

High-purity silica quartz (SiO₂ > 99.0%), low-ash metallurgical coke, clean steel scrap, and charcoal are strictly inspected and proportioned.

Submerged Arc Furnace (SAF) Smelting

Materials are smelted at temperatures exceeding 2000°C in electric submerged arc furnaces, reducing silicon dioxide into metallic silicon dissolved in molten iron.

Refining & Slag Removal

Molten FeSi is tapped into ladles where argon stirring and refining agents are applied to remove unwanted slag inclusions, aluminum, and trace impurities.

Controlled Casting & Cooling

Molten metal is cast into shallow ingot molds to achieve rapid, uniform solidifying, preventing micro-segregation of chemical elements.

Crushing & Precision Screening

Cooled ingots are processed through jaw crushers and vibratory screeners to achieve precise particle size distribution (e.g., 10-50mm).

Sampling & Final Packaging

Every batch is sampled according to ISO 3713 standards, verified by XRF/Chemical testing, and sealed in weatherproof jumbo bags.

Quality Control & Testing

Laboratory Capabilities

Our in-house ISO/IEC 17025 compliant laboratory is equipped with X-Ray Fluorescence (XRF) Spectrometers, Carbon-Sulfur Analyzers, and Automated Sieve Shakers.

Heat-Wise Traceability

Every jumbo bag is labeled with a unique heat batch number. Customers can trace chemical composition, furnace logs, and inspection dates for every shipment.

Sampling Protocols

Sampling is performed in strict compliance with ISO 3713 (Ferroalloys — Sampling and sample preparation).

Independent Third-Party Inspection

We welcome and facilitate pre-shipment inspections (PSI) at loading ports by recognized independent surveyors including SGS, AHK, Bureau Veritas (BV), or CCIC. Certificate of Analysis (COA) is provided with every bill of lading.

Manufacturing Capability

Manufacturing Capability	Details
Factory Area	80000+ m²
Production Lines	8
Export Markets	80+ Countries
OEM Experience	31 Years

Packaging & Shipping

Standard Packaging Options

1.0 MT / 1.25 MT Waterproof Big Bags (FIBC): Constructed from heavy-duty UV-resistant woven polypropylene with an internal PE plastic liner to prevent moisture ingress.

Bottom-Discharge Jumbo Bags: Designed with bottom discharge spouts for direct furnace or hopper loading without manual bag cutting.

Steel Drums / Wooden Palletizing: Available for fine granules or small-batch orders requiring extra physical protection.

Shipping & Logistics Support

Container Shipping (FCL): 20–26 MT loaded per 20’ Heavy Duty Container.

Breakbulk Vessel Loading: Dedicated bulk shipping capability for large volume steel plant orders (1,000 MT +).

Frequently Asked Questions

Q: What Ferro Silicon grades do you supply?

A: We manufacture and export a wide range of Ferro Silicon grades, including FeSi 45%, FeSi 65%, FeSi 70%, FeSi 72%, FeSi 75%, Low Aluminum Ferro Silicon, and Ferro Silicon Inoculants. Custom chemical compositions are also available based on your application requirements.

Q: Can you customize the chemical composition and particle size?

A: Yes. We offer customized silicon content, aluminum levels, carbon content, and trace element control according to customer specifications. Particle sizes such as 0–3 mm, 1–3 mm, 3–8 mm, 10–50 mm, 10–100 mm, and other custom ranges can also be supplied.

Q: What is the difference between FeSi 72% and FeSi 75%?

A: The primary difference is the silicon content and intended application. FeSi 75% provides higher silicon recovery and is widely used in steelmaking and magnesium production, while FeSi 72% offers a more economical solution for cast iron production and general steelmaking. The best choice depends on your metallurgical process and performance requirements.

Q: How do you ensure consistent product quality?

A: Every production batch undergoes strict quality control, including raw material inspection, furnace process monitoring, chemical composition analysis, particle size inspection, and final laboratory testing. Each shipment is supplied with a Certificate of Analysis (COA) for full batch traceability.

Q: Do you support third-party inspection before shipment?

A: Yes. We welcome pre-shipment inspections by internationally recognized organizations such as SGS, Bureau Veritas (BV), CCIC, or customer-designated inspection agencies. Inspection reports can be provided before shipment upon request.

Q: What packaging options are available?

A: Standard packaging includes 1 MT and 1.25 MT waterproof FIBC jumbo bags with PE liners. We also provide 25 kg bags, palletized packaging, steel drums, and customized packaging according to customer requirements.

Q: Can you export Ferro Silicon to Europe and other international markets?

A: Yes. Our Ferro Silicon products are exported worldwide and comply with international export requirements. We can provide the necessary technical documents and support customers in Europe, North America, the Middle East, Southeast Asia, and other global markets.

Q: Do you provide free samples?

A: Yes. Free samples are available for laboratory testing and evaluation. Sample quantities are typically 1–2 kg, and customers only need to arrange or cover the courier transportation according to the destination.

Q: What is your production capacity and delivery time?

A: Our production capacity enables us to supply both regular orders and large-volume projects. Standard delivery time is typically 15–30 days after order confirmation, depending on the product grade, order quantity, and production schedule.

Q: How can I request a quotation?

A: Simply send us your required Ferro Silicon grade, chemical specification, particle size, quantity, destination port, and preferred Incoterms. Our sales and technical team will prepare a detailed quotation and recommend the most suitable product for your application.

As one of the most professional ferro silicon manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy bulk ferro silicon in stock here and get quotation from our factory. We also accept customized orders.