Product Overview

Ferro Silicon (FeSi) is a versatile iron-silicon alloy produced by reducing silica (quartz) with carbon in submerged arc furnaces. It serves as a critical raw material in steelmaking, foundry, and ferroalloy production. Depending on the grade, FeSi contains 45% to 90% silicon, with the balance primarily iron and controlled levels of aluminum, calcium, carbon, sulfur, and phosphorus.

The alloy is available in various forms-lump, powder, or granulated-to suit different addition methods including ladle, furnace, or stream inoculation. Its primary functions include deoxidation, alloying, and inoculation, making it indispensable for producing high-quality carbon steel, stainless steel, electrical steel, and cast iron.

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Key Functions & Applications 🏭

Deoxidation in Steelmaking

Oxygen is a harmful impurity in liquid steel, causing porosity, inclusions, and reduced mechanical properties. Ferro Silicon reacts vigorously with dissolved oxygen to form silicon dioxide (SiO₂) slag, which floats to the surface and is removed. Compared to aluminum deoxidation, silicon produces more fluid and easily removable oxide products, reducing nozzle clogging during continuous casting.

Alloying Element Addition

Silicon improves the mechanical properties of steel, particularly tensile strength, hardness, and elastic modulus. Ferro Silicon is the standard source of silicon for:

Carbon steel – improves strength without reducing ductility

Spring steel – enhances elastic limit and fatigue resistance

Electrical steel – increases electrical resistivity and reduces core loss

Stainless steel – improves oxidation resistance

Inoculation in Cast Iron

In gray and ductile iron foundries, Ferro Silicon serves as the base material for inoculants. When added to molten iron, it promotes graphite nucleation, reduces chill depth, and eliminates carbides. Specialized FeSi products contain barium, calcium, strontium, or rare earth elements for enhanced inoculation performance.

Reducing Agent in Ferroalloy Production

Ferro Silicon is used to reduce other metal oxides, particularly for producing ferro molybdenum, ferro vanadium, and ferro titanium. Its strong affinity for oxygen makes it an effective reductant in pyrometallurgical processes.

Product Forms & Sizing Options 📦

Form	Typical Size Range	Best For
Lump	10–50 mm, 10–100 mm	Ladle addition, furnace charging
Granular	1–3 mm, 3–8 mm	Stream inoculation, automatic feeding
Powder	0–1 mm, 0.2–0.8 mm	Powder injection, core wire filling
Briquette	20–50 mm (compressed)	Optimized dissolution in BOF/EAF

Custom sizing is available upon request. Please specify your mesh or millimeter requirements when ordering.

All products are packaged in 1 MT jumbo bags, 25 kg woven bags, or steel drums for powder grades. Anti-moisture liners are included for all shipments to prevent oxidation during transit and storage.

Quality Assurance & Testing 🔬

Every shipment of Ferro Silicon undergoes rigorous quality control to ensure consistent chemistry and performance.

Standard Testing Methods

Chemical analysis – X-ray fluorescence (XRF) for main elements; combustion infrared absorption for carbon and sulfur
Particle size distribution – Mechanical sieving per ASTM E11
Moisture content – Loss on drying at 105°C
Bulk density – Measured for powder and granular grades

Certificates Provided

Certificate of Analysis (COA) for each lot
Material Safety Data Sheet (MSDS)
Origin certificate (if required)
Third-party inspection (SGS, BV, CCIC) available upon request

Quality Management

Our Ferro Silicon production facilities are ISO 9001:2015 certified. Regular inter-laboratory comparisons ensure testing accuracy. We maintain retained samples for each batch for minimum 12 months.

Product Parameter Table 📊

Parameter	FeSi 45%	FeSi 65%	FeSi 75%	FeSi 90%	Test Method
Si (%)	45–47	65–68	75–80	90–95	XRF
Fe (%)	50–53	29–32	18–22	4–8	Calculation
Al (%) max	1.5	1.5	1.5	1.0	XRF
Ca (%) max	1.0	1.0	1.0	0.5	XRF
C (%) max	0.2	0.2	0.1	0.1	Combustion
S (%) max	0.05	0.03	0.02	0.01	Combustion
P (%) max	0.05	0.04	0.03	0.02	XRF
Moisture (%) max	0.5	0.5	0.5	0.3	Drying
Size (mm)	10–50	10–50	10–50 / 3–8 / 0–1	3–8 / 0–1	Sieve
Melting Point (°C)	~1260	~1290	~1310	~1370	-
Density (g/cm³)	~5.2	~5.0	~4.8	~4.2	-

Packaging, Shipping & Storage 📦✈️

Packaging Options

Jumbo bag – 1,000 kg (2,200 lbs) woven polypropylene bag with inner PE liner
Small bag – 25 kg (55 lbs) woven bag, 40 bags per jumbo bag or pallet
Steel drum – 200 kg (440 lbs) for powder grades
Bulk – In container for lump grades (loose loading with liner)

Container Loading

20' standard container: ~20–22 MT (jumbo bags)
20' open-top container: ~24–25 MT (bulk loading)

Shipping Lead Times

In-stock products – 7–10 days after payment
Production orders – 20–30 days after order confirmation
Storage Recommendations

Store in a dry, covered area away from moisture and acids. Ferro Silicon can react with water to release hydrogen gas, particularly in fine powder grades. Do not store near heat sources or incompatible materials (acids, oxidizers). Maximum recommended shelf life: 12 months in original unopened packaging.