Ferro Silicon Granules (abbreviated as FeSi Granules) are specialized ferroalloy particles with controlled silicon (Si) content (50–90%), iron (Fe) as the balance, and strict size ranges (0.1–5mm). Unlike traditional ferro silicon lumps (5–50mm) prone to uneven feeding and dust loss, their uniform granular form enables automated precision dosing (±0.1kg), rapid dissolution (3–5 minutes in molten metal), and minimal waste (loss rate ≤2% vs. 8–10% for lumps). Available in grades like FeSi 50, FeSi 70, and FeSi 90, they are indispensable for precision steelmaking, investment casting, and small-batch alloy production, solving the pain points of inconsistent alloying and low production efficiency.

FeSi Granules are produced by crushing ferro silicon ingots into fine particles, then screening to strict size ranges (0.1–5mm) and removing impurities via magnetic separation. Its core value lies in its perfect match with the demands of automated, precise, and efficient modern metallurgical production:

Precise Metering: Uniform size ensures smooth transport in automatic feeders and vibrating feeders, achieving precise addition at the kilogram or even gram level.

Rapid Dissolution: Its large specific surface area allows for complete dissolution within 2-5 minutes after being added to molten steel or iron, resulting in a rapid and uniform reaction and preventing component segregation.

High Yield: The particle shape significantly reduces dust loss and oxidation during transportation and feeding, resulting in a significantly higher elemental recovery rate (such as silicon recovery) compared to block products.

Environmental Improvement: Effectively controls dust in the production area, improving the working environment.

Ferrosilicon granules 2 Ferrosilicon granules 3

chemical composition

Selection Dimensions	Options and suggestions	Typical Application Scenarios
Silicon Content (Grade)	FeSi 75 (72-78%): The most common grade, cost-effective, suitable for deoxidation and alloying of most steels and inoculation of cast iron.	Ordinary steel grades, various cast irons, magnesium reduction.
	FeSi 65 (65-72%): An economical choice, used in applications with slightly lower requirements.	Ordinary cast iron, carbon steel.
	FeSi 45/50 (45-55%): Used for low-cost silicon addition.	Cast iron composition adjustment, ordinary steel grades.
Size Range	Coarse particles (3-10mm): Suitable for automatic feeding in hoppers of large electric furnaces and converters, with a moderate dissolution rate.	Batch addition in the main steelmaking process.
	Medium particles (1-3mm): A general size, suitable for ladle addition and casting pretreatment.	Ladle alloying, cast iron pretreatment.
	Fine particles (0.2-1mm): Used for precision addition, in-flow inoculation, and wire feed filler.	Casting inoculation, special alloys, injection materials.
Key Impurity Control	Low-aluminum type (Al<1.0%): For high-quality special steels with strict requirements on the morphology of inclusions (such as bearing steel and pipeline steel).	High-end clean steel, aluminum-killed steel.
	Low-calcium type: Selected according to specific metallurgical needs.	Refining of specific steel grades.
	Low carbon type (C<0.1%): Used for producing low carbon and ultra-low carbon steels to avoid carbon increase.	Low-carbon stainless steel, ultra-low-carbon steel.

Use of ferrosilicon granules

iron industry

Ferro silicon granules are an important alloy additive in the steel industry, mainly used to improve the strength, hardness, corrosion resistance and oxidation resistance of steel. In the steelmaking process, adding an appropriate amount of ferrosilicon granules can improve the properties of steel and increase the quality and output of steel.

Nonferrous metal industry

Ferro silicon granules are mainly used in the nonferrous metal industry to produce high-performance alloys such as aluminum alloys, nickel alloys, and titanium alloys. In these alloys, ferrosilicon granules can improve strength, hardness, corrosion resistance and oxidation resistance, and can also lower the melting point of the alloy to facilitate processing.

Chemical industry

Ferro silicon granules are also an important raw material in the chemical industry and are mainly used to produce silicone, silicate and other compounds. These compounds have excellent physical and chemical properties, such as high temperature resistance, corrosion resistance, good insulation, etc., and are widely used in rubber, ceramics, glass and other fields.

Ferro Silicon Granules

Sourcing Guide: How to Select Ferro Silicon Granules

Match Grade to Application:

Cost-sensitive casting (gray iron): FeSi 50 granules (1–5mm) – balance cost and basic deoxidation.
Precision steelmaking (automotive): FeSi 70 granules (0.5–2mm) – optimal efficiency and purity.
High-purity alloys (aerospace): FeSi 90 granules (0.1–1mm) – high Si content for minimal dosage.

Select Size by Equipment:

Automated screw feeders: 0.5–2mm granules (no clogging, uniform flow).
Vacuum induction furnaces: 0.1–1mm granules (fast dissolution, precise dosing).
Bulk die casting: 1–3mm granules (efficient feeding, low dust).

As a professional ferroalloy supplier with 15+ years of precision metallurgy experience, we offer:

Full Grade & Size Range: FeSi 50/70/90 granules with customized sizes (0.1–5mm), including:
Automotive Grade: FeSi 70 (0.5–2mm, C≤0.3%) – optimized for IF/DP steel.
Casting Grade: FeSi 50 (1–3mm, C≤0.8%) – cost-effective for gray iron.

Contact us today to request a free sample and customized quote – elevate your precision metallurgical processes with Ferro Silicon Granules!

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