What is the SG of FeSi? - Knowledge

What is the price of ferro silicon? Ferrosilicon Price Today//Latest Updates from the Chinese FeSi Markets

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

What is SG (Specific Gravity)?

Specific Gravity (SG) is the ratio of the density of a substance to the density of water (at 4°C, where water density = 1 g/cm³).

Since the density of water is 1 g/cm³, SG ≈ density in g/cm³ (numerically).

So when we say the SG of FeSi is X, it also means its density is X g/cm³.

Typical Specific Gravity (SG) / Density of Ferrosilicon (FeSi)

Ferrosilicon Grade	Approx. Si Content	Approx. Density (g/cm³)	Approx. SG (Specific Gravity)
FeSi 45	40–47% Si	6.8 – 7.1 g/cm³	6.8 – 7.1
FeSi 65	60–67% Si	6.5 – 6.8 g/cm³	6.5 – 6.8
FeSi 75	72–78% Si	6.0 – 6.5 g/cm³	6.0 – 6.5 ✅ Most Common
FeSi 90	88–92% Si	5.5 – 6.0 g/cm³	5.5 – 6.0

For Ferrosilicon 75 (the most widely used grade), the typical SG is around 6.0 – 6.5 g/cm³

Why Does SG Vary with Silicon Content?

Iron (Fe) has a higher density (~7.87 g/cm³).

Silicon (Si) has a lower density (~2.33 g/cm³).

So, as the silicon percentage increases in the ferrosilicon alloy, the overall density decreases, and thus the SG becomes lower.

Quick Reference: Ferrosilicon 75 (Most Common Grade)

Property	Value
Grade	FeSi 75 (72–78% Si)
Density	6.0 – 6.5 g/cm³
Specific Gravity (SG)	6.0 – 6.5
Appearance	Grayish metallic lumps, granules, or powder
Iron Content	22–28%

Practical Implications of SG

SG is important for:

Material handling (flow, bulk density)

Furnace charging calculations

Alloy dosing (knowing how much material by volume equates to a certain weight)

Transport and storage design

For example, if you're using FeSi 75 with SG = 6.2 g/cm³, then:

1 liter of FeSi 75 weighs ~6.2 kg

This helps in calculating how much alloy you're adding per batch in steel or foundry operations.

Summary

Grade	Silicon %	Approx. SG (Specific Gravity)	Approx. Density (g/cm³)
FeSi 45	40–47%	6.8 – 7.1	6.8 – 7.1
FeSi 65	60–67%	6.5 – 6.8	6.5 – 6.8
FeSi 75	72–78%	6.0 – 6.5 ✅	6.0 – 6.5 ✅
FeSi 90	88–92%	5.5 – 6.0	5.5 – 6.0

Final Answer:

The Specific Gravity (SG) of Ferrosilicon (FeSi) typically ranges from 5.5 to 7.1, depending on silicon content.

For Ferrosilicon 75 (the most common grade, with 72–78% silicon), the SG is around 6.0 – 6.5.

This also means its density is about 6.0 – 6.5 g/cm³.

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.

Get a Quote Today

🏭 What sets ZhenAn International Co., Ltd. apart:

•A diverse product portfolio including ferro silicon, silicon metal, Ferrosilicon Nitride , and electrolytic manganese metal flakes.
•Commitment to stringent quality assurance backed by certifications.
•Tailored solutions to meet specific customer needs globally.
Would you like to explore how our products and services can add value to your business? I'd be happy to share more information or provide a detailed catalog for your review.

one-stop solution

professional team

high quality