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What Is The Specific Gravity Of Ferrosilicon?

Dec 03, 2025

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What is the price of ferrosilicon today? 

Today's price of ferrosilicon exported from China
Unit: US dollars/ton
product Brand Quotation rise and fall Remark
Ferrosilicon 72 1020-1040 -- FOB Tianjin Port
Ferrosilicon 75 1100-1120 -- FOB Tianjin Port
 

 

Q:​ What's today's export price for Chinese ferrosilicon?
A:​ It's quoted in US dollars per ton.
Q:​ How much is Ferrosilicon 72 today?
A:​ It's about 1020 to 1040 US dollars per ton.
Q:​ And what about Ferrosilicon 75?
A:​ That one is 1100 to 1120 US dollars per ton.
Q:​ Which one is more expensive?
A:​ Ferrosilicon 75 is more expensive than 72.
Q:​ Are these prices for export from China?
A:​ Yes, they are export prices from China.

 

Ferro Silicon

What is the specific gravity of ferrosilicon?​

Understanding Specific Gravity for Different FeSi Grades
Specific gravity​ (relative density) of ferrosilicon is the ratio of its density to the density of water at 4 °C. Since water's density is ~1 g/cm³, specific gravity is numerically equal to density in g/cm³ for practical purposes, but it is dimensionless.
Ferrosilicon density varies with silicon content because silicon (ρ ≈ 2.33 g/cm³) is less dense than iron (ρ ≈ 7.87 g/cm³). Higher silicon content lowers the overall density.
FeSi Grade
Typical Si %
Approx. Density (g/cm³)
Specific Gravity
FeSi 45
45
5.0–5.2
5.0–5.2
FeSi 65
65
4.7–4.9
4.7–4.9
FeSi 75
75
4.5–4.7
4.5–4.7
FeSi 90
90
3.5–3.7
3.5–3.7
Key Points

•FeSi 75​ (most common in steelmaking) has a specific gravity around 4.6.

•Specific gravity decreases linearly as Si % increases.

•Measured at room temperature; heating reduces density slightly due to thermal expansion.

•Useful for calculating alloy additions in molten metal processing when converting mass to volume.

Understanding specific gravity helps metallurgists determine how much ferrosilicon to add to achieve target silicon concentration in steel melts.

 

What is the density of FeSi?​

Mass per Unit Volume Across FeSi Compositions
The density of ferrosilicon​ depends primarily on its silicon content and microstructure (crystalline vs. molten state). Solid densities at room temperature are well established; molten densities are lower due to expansion.
FeSi Type
Si Content (%)
Solid Density (g/cm³)
Molten Density @ ~1600 °C (g/cm³)
FeSi 15
15
~6.7
~5.5
FeSi 45
45
~5.1
~4.2
FeSi 65
65
~4.8
~3.9
FeSi 75
75
~4.6
~3.7
FeSi 90
90
~3.6
~2.9
Notes

•Values are averages; actual density varies with production method and minor element additions (Al, Ca, Mn).

•Molten density is crucial for modeling alloy mixing and slag formation in furnaces.

•Density affects settling behavior in liquid steel - denser FeSi sinks faster, influencing alloy distribution.

Density data aids in designing feeding systems and predicting alloy dissolution rates in ladle or furnace metallurgy.
Ferro Silicon

What is the hardness of FeSi?​

Mechanical Strength of Ferrosilicon Alloys
Ferrosilicon is a brittle, hard ferroalloy. Its hardness​ is usually measured on the Mohs scale​ or Rockwell C (HRC)​ scale for comparison with other metallurgical materials.
FeSi Grade
Mohs Hardness
Approx. HRC (if applicable)
Remarks
FeSi 45
5–6
~45–50
Moderate brittleness
FeSi 65
5.5–6.5
~48–52
Commonly used in deoxidation
FeSi 75
6–7
~50–55
High hardness, very brittle
FeSi 90
6.5–7
~52–58
Extremely hard, pulverizes easily
Characteristics

•Hardness increases with silicon content due to silicon's strengthening effect and finer eutectic structure.

•Brittleness means FeSi breaks rather than deforms under stress - important for crushing/grinding before adding to melts.

•High hardness aids in wear resistance when used in foundry facing sands or as an inoculant.

Because of its brittleness, ferrosilicon is supplied in lumpy, crushed, or powdered forms depending on application.

 

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