What are the grades of Iron Silicon 75?

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 Iron Silicon 75 Used For?​

Key Applications of FeSi 75 in Metallurgy and Industry
Iron Silicon 75​ (also called Ferro Silicon 75) is a ferroalloy containing approximately 75% silicon​ and the balance mainly iron, with minor traces of aluminum, calcium, or carbon depending on production method. It is prized for its strong deoxidizing​ and alloying​ capabilities in metal production.
Application Area
Function in Process
Benefits
Steelmaking (EAF/BOF & ladle)
Removes oxygen as SiO₂ slag
Cleaner steel, fewer gas defects
Alloy steel production
Adds silicon to improve strength & magnetic properties
Higher tensile strength, better wear/corrosion resistance
Electrical steel manufacturing
Supplies Si for grain orientation
Lower core losses, higher magnetic efficiency
Cast iron inoculation
Controls graphite shape
Reduces chill, improves machinability
Welding consumables
Deoxidizer in electrode coatings/fluxes
Stable arc, stronger welds with fewer inclusions
Detailed Uses

•Deoxidation: In molten steel, Si reacts with O to form silica, which floats as slag, removing dissolved gases and preventing porosity.

•Alloying: Silicon enhances hardenability, strength, and elastic modulus in structural and tool steels.

•Graphite control: In cast irons, FeSi 75 modifies graphite morphology, preventing brittle structures and improving ductility.

•Welding: Acts as a scavenger for oxygen and helps produce clean, strong weld beads with smooth contours.

•Electrical steels: Si improves magnetic permeability and reduces hysteresis losses, critical for transformers and electric motors.

Because of its high silicon content and cost efficiency, Iron Silicon 75 is a go‑to material for achieving target chemistries in large‑scale steel, iron, and alloy manufacturing.

 

2. What Are the Grades of Iron Silicon 75?​

Variations and Classifications Within FeSi 75
Although "Iron Silicon 75"​ nominally indicates ~75% silicon, there are grades​ based on exact Si content, impurity limits, and physical form. These grades allow producers and users to select the optimal material for specific processes.
Grade
Si Content (wt%)
Key Characteristics
Typical Impurities
Common Forms
FeSi 75 (Standard)
73–78%
Most widely traded grade
Al ≤ 0.5%, C ≤ 0.1%
Lump, crushed
FeSi 75 (Low Al)
74–77%
Reduced aluminium for cleaner steel
Al ≤ 0.1–0.2%
Lump, granule
FeSi 75 (High Purity)
75–78%
Ultra‑low P, S, Ca for specialty steels
P ≤ 0.03%, S ≤ 0.02%
Powder, fine granule
FeSi 75 (Briquette)
73–76%
Pressed blocks for dust control
Al ≤ 0.5%
Briquette
Explanation of Grade Differences

•Standard FeSi 75: General purpose for steel deoxidation and alloying.

•Low Al grade: Used when aluminium pickup must be minimized (e.g., in deep‑drawing steels).

•High Purity grade: Required for electrical steels, stainless steels, and other high‑grade alloys where trace elements affect performance.

•Briquette form: Easier to handle and dose automatically; reduces airborne dust during charging.

Selection Criteria

•Choose grade based on target silicon level, acceptable impurity profile, and process requirements​ (e.g., powder for rapid dissolution, briquette for controlled feeding).

•Matching grade to application ensures optimal metallurgical results and cost efficiency.

These grades make Iron Silicon 75 adaptable to a wide range of steel, foundry, and advanced material applications.

 

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

Comparing Elemental Silicon with Its Iron‑Based Alloy
Silicon (Si) is a chemical element; Iron Silicon 75 is an alloy​ of silicon and iron, with ~75% Si and ~25% Fe.
Parameter
Silicon (Pure)
Iron Silicon 75
Chemical nature
Pure element (≥98%)
Alloy (Si 75%, Fe balance)
Form
Crystalline solid, powder, lump
Lump, granule, powder
Reactivity
Highly reactive with oxygen and moisture
Moderate reactivity (iron matrix stabilizes Si)
Melting point
~1414 °C
~1200–1300 °C
Purity
Very high (for electronics/PV)
Lower Si%, contains Fe and trace elements
Main uses
Semiconductors, solar cells, silicones
Steel deoxidation, alloying, cast iron inoculation
Handling
Requires protection from oxidation
Easier and safer in metallurgical melts
Key Differences

•Composition: FeSi 75 contains iron, altering physical properties and reducing cost.

•Reactivity: Pure silicon is more reactive; FeSi 75 is less prone to fuming and oxidation during addition to molten metal.

•Applications: Silicon metal is for high‑purity tech uses; FeSi 75 is for bulk metallurgy where iron contamination is acceptable or beneficial.

•Cost: FeSi 75 is cheaper for achieving silicon's metallurgical effects in steel and iron production.

Thus, Iron Silicon 75 is the practical choice for large‑scale metal treatment, while pure silicon serves specialized high‑tech industries.

 

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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