What is the difference between Iron Silicon 75 and silicon metal?

Dec 04, 2025

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Ferro Silicon  75

What is the price of ferrosilicon 75 today? Ferro-silicon 75% Si min export, fob China, $/tonne

Today's price of ferrosilicon exported from China
Unit: US dollars/ton
product Quotation
Ferrosilicon 72 1020-1040
Ferrosilicon 75 1100-1120

1. What is the Difference Between Iron Silicon 75 and Silicon Metal?​

Comparing an Alloy and a Pure Element for Metallurgical Use
Iron Silicon 75​ (FeSi 75) is a ferroalloy containing ~75% silicon and ~25% iron, while silicon metal​ is the nearly pure elemental form of silicon (≥98%). Their differences affect reactivity, applications, handling, and cost.
Parameter
Iron Silicon 75
Silicon Metal
Chemical nature
Alloy (Si + Fe)
Pure element (≥98% Si)
Si content
~73–78%
≥98% (often 99.9% for high-tech)
Iron content
~22–27%
<2%
Form
Lump, granule, powder, briquette
Lump, chunk, powder
Melting point
~1200–1300 °C
~1414 °C
Reactivity
Moderate (Fe matrix stabilizes Si)
Highly reactive with O₂ and moisture
Main uses
Steel deoxidation, alloying, cast iron inoculation
Semiconductors, solar cells, silicones
Cost
Lower for equivalent metallurgical Si
Higher for high purity
Handling
Easier in molten metal processes
Requires protection from oxidation
Key Differences

•Composition: FeSi 75 contains iron, making it cheaper and less reactive; silicon metal is nearly pure, used where contamination is unacceptable.

•Reactivity: Silicon metal fume and oxidize rapidly at high temperatures; FeSi 75 releases less fume, easing furnace operation.

•Applications: FeSi 75 is for bulk metallurgy (steel, iron); silicon metal is for high-tech industries (electronics, photovoltaics, chemicals).

•Form & dissolution: FeSi 75 dissolves readily in steel melts; silicon metal may require special techniques to avoid violent reactions.

Conclusion: Iron Silicon 75 is the cost‑effective choice for adding silicon in metallurgy, while silicon metal serves precision applications demanding ultra‑high purity.

 

2. What is the Composition of Iron Silicon 75?​

Typical Chemical Makeup and Grade Specifications
Iron Silicon 75​ is defined by its nominal 75% silicon​ content, with the balance mainly iron and trace elements. Exact composition varies slightly by producer and grade.
Component
Typical Range (wt%)
Notes
Silicon (Si)
73–78% (nominal 75%)
Main alloying element
Iron (Fe)
Balance (~22–27%)
Matrix metal
Aluminum (Al)
≤ 0.5% (lower in special grades)
Residual from reduction
Calcium (Ca)
≤ 0.1–0.5%
Minor impurity
Carbon (C)
≤ 0.1%
Depends on production method
Phosphorus (P)
≤ 0.03–0.05%
Controlled for steel quality
Sulfur (S)
≤ 0.02–0.05%
Kept low to avoid hot shortness
Forms Available

•Lump: Irregular pieces (10–80 mm), common for steelmaking.

•Granule/Powder: For rapid dissolution or welding fluxes.

•Briquette: Pressed blocks to reduce dust and allow precise feeding.

Grade Variations

•Standard FeSi 75: General steel deoxidation.

•Low-Al FeSi 75: For steels sensitive to aluminium contamination.

•High-Purity FeSi 75: Ultra-low P, S, Ca for electrical steels and specialty alloys.

This composition allows FeSi 75 to act as an efficient deoxidizer​ and silicon source​ in metallurgical processes while maintaining cost efficiency.

 

3. What is the Demand for Iron Silicon 75?​

 Market Drivers and Key Consumption Sectors
The demand for Iron Silicon 75​ is driven by its essential role in steelmaking, foundry, and alloy production, particularly in regions with large infrastructure and manufacturing bases.
Sector
Share of Demand
Key Drivers
Steel industry
~85%
HSLA, rebar, electrical steels, automotive steels
Cast iron foundries
~10%
Inoculation, nodularization of ductile iron
Welding consumables
~3%
Electrode coatings, fluxes
Others (chemical, powder metallurgy)
~2%
Silicon source for specialty applications
Market Trends

•Infrastructure growth: Rising demand for high‑strength rebar and structural steel boosts FeSi 75 use.

•Automotive sector: Need for lighter, stronger steels in EVs and safety components increases consumption.

•Electrical steel: Expansion of renewable energy and power grids drives demand for grain‑oriented electrical steels containing FeSi 75.

•Geographic hotspots: China, India, Kazakhstan, and Middle East are major consumers due to large steel output.

Supply Factors

•Produced mainly in China, Norway, Kazakhstan, and Brazil.

•Prices influenced by silica and electricity costs (electric arc furnace production).

•Environmental regulations can affect output, impacting availability.

Overall, demand remains strong and steady, closely tied to global steel production and the shift toward high‑performance, low‑weight materials in construction and manufacturing.

 

Visit https://www.metal-alloy.com/ to learn more about the product. If you would like to learn more about the product price or are interested in purchasing, please email market@zanewmetal.com. We will get back to you as soon as we see your message.

 

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Iron Silicon Alloy With 75 Silicon Silver Grey Powder For High Strength Alloy Steel Making

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ZhenAn has product experts, and the chemical composition, particle size, and packaging of products can be customized as per customer needs.
Each product has an annual production capacity of 60,000 tons, ensuring a stable supply and timely delivery.
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Strict Quality Control
As a trustworthy supplier, Anyang ZhenAn ensures quality control, inspection, and technical services. We have a comprehensive quality control process throughout production, including:

  • Chemical analysis of raw materials.
  • Chemical analysis of molten material.
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  • Chemical analysis before shipment.

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