Ferrosilicon 75 is a ferroalloy produced by smelting coke, steel scrap, and quartz (or silica) in an electric furnace. Its silicon content is consistently around 75%. The standard block size of 10-50mm is the most widely used specification in the international steelmaking and casting industry, characterized by moderate melting speed and high absorption rate.

Why choose a 10-50mm size?

During the smelting process, the choice of size directly affects cost and quality:

Optimal melting rate:

When added to the ladle, 10-50mm particles do not oxidize and burn off as quickly as powder, nor are they absorbed as slowly as large pieces, ensuring a stable silicon recovery rate of over 90%.

Good permeability:

In electric furnace operation, this size helps maintain the permeability of the furnace charge, improving smelting efficiency.

Automatic feeding:

This size perfectly matches the automatic weighing and feeding systems of most modern factories, reducing dust pollution.

Ferro Silicon 75 10-50mm

chemical composition

Elements	Grade 75#
Si	72% - 80% (Customizable)
Al	1.5% Max (1.0% / 0.5% Low Aluminum Grade Available)
Ca	1.0% Max
P	0.04% Max
S	0.02% Max
Size	10 - 50mm (90% min passing)

Core Advantages Compared to Other Ferrosilicon Products

Comparative Products	Ferro Silicon 75% 10-50mm Advantages
65# Ferrosilicon	10% higher silicon content, 25% improved deoxidation/alloying efficiency, 30% reduced dosage
72# Ferrosilicon	0.5%-1.0% higher aluminum content, improved casting nucleation effect, and longer inoculation life
5-10mm Fine-Grain Ferrosilicon	5% lower dust loss, easier charging, suitable for medium and large furnaces (avoids bridging)
50-100mm Coarse-Grain Ferrosilicon	15% faster melting speed, more complete reaction with the melt, and no component segregation

Main Application Areas

Steelmaking Industry:

Used as a strong deoxidizer in the production of killed steel, low-alloy steel, and stainless steel. Also used as an alloying agent to improve the hardness, strength, and heat resistance of steel (e.g., transformer silicon steel sheets).

Ferroalloy Production:

Used as a reducing agent in the production of low-carbon ferroalloys.

Casting Iron Industry:

Commonly used as an inoculant and spheroidizing agent to improve graphite morphology, prevent white cast iron formation, and enhance mechanical properties.

FAQ

Q: What is the difference between 75# ferrosilicon and 72# ferrosilicon?

A: The main difference lies in the silicon content and impurity control. 75# has stronger deoxidation capabilities and usually has a lower aluminum content, making it suitable for the production of specialty steels with extremely high silicon content requirements.

Q: Do you support SGS testing?

A: Yes, we support all third-party testing (SGS, BV, Intertek, etc.) to ensure that the composition before shipment is completely consistent with the sample.

ferro silicon 75 10-50mm