What Is Ferrosilicon 70 Used For?

1. What is ferrosilicon 70 used for?

Ferrosilicon is an alloy of iron and silicon, typically containing 15–90% silicon. It's primarily used in:

Steelmaking: As a deoxidizer and alloying element, it helps remove oxygen and improve the final properties of steel.

Cast iron production: Enhances graphite formation, improving strength and machinability.

Inoculant: Used to promote the formation of desirable microstructures in castings.

Production of magnesium: In the Pidgeon process, ferrosilicon is a reducing agent for magnesium from dolomite.

 

2. What is ferro silicon magnesium used for?

Ferro silicon magnesium (FeSiMg) is a master alloy of ferrosilicon with magnesium and sometimes calcium or rare earth elements. It is used to:

Produce ductile (nodular) cast iron, which has superior strength and ductility compared to gray cast iron.

Modify the graphite structure from flakes to spheroids (nodules) in iron, which enhances mechanical properties.

 

3. What are the grades of ferrosilicon?

Grades of ferrosilicon are generally classified by their silicon content:

FeSi 75: ~75% Si – most commonly used grade.

FeSi 65: ~65% Si – less common, more cost-effective for some uses.

FeSi 45 / 15: Low-silicon grades – used where lower silicon is needed.

They may also be specified by:

Size (granular, lumpy, powder)

Purity levels (low aluminum, low carbon)

Additives (for specialized alloys)

 

4. What is the price of ferro silicon per kg?

The price of ferrosilicon varies based on:

Silicon content

Purity

Market demand

Region of purchase

As of recent market trends (2025), FeSi 75% typically costs between $1.20 to $2.00 per kg. Prices fluctuate based on global supply and demand, particularly in steelmaking industries.

 

5. What are the properties of ferrosilicon?

Key properties of ferrosilicon include:

Chemical composition: 15–90% Si, remainder mostly iron.

High melting point: ~1200–1350°C depending on Si content.

Density: 2.4–5 g/cm³ (varies with composition).

Hard and brittle

Magnetic

Reacts with water when finely powdered (in high-Si content)

Good deoxidizing capabilities

 

6. What is the element silicon best used for?

Elemental silicon (Si) is widely used in:

Electronics: As a semiconductor in transistors, microchips, and solar cells.

Glass and ceramics: In the form of silica (SiO₂).

Alloys: With aluminum and steel to enhance properties.

Construction: As part of silicones (sealants, lubricants, and insulation materials).

Photovoltaics: As the primary material in solar panels.