What Is Ferro Silicon 75 (FeSi 75)?

1. What is Ferro Silicon 75 (FeSi 75)?

Ferro Silicon 75 (FeSi 75) is a widely used ferro silicon alloy containing approximately 75% silicon, with the remainder mainly iron. It is produced in submerged electric arc furnaces using high-purity quartz and carbon-based reducing agents.

As a core deoxidizer and alloying additive, Ferro Silicon 75 is extensively applied in steelmaking, cast iron production, and alloy steel manufacturing. Due to its high silicon content and stable performance, FeSi 75 helps improve steel cleanliness, mechanical strength, and overall production efficiency.

2. What is the chemical composition of Ferro Silicon 75?

The chemical composition of Ferro Silicon 75 is carefully controlled to ensure consistent quality and reliable metallurgical performance. A typical Ferro Silicon 75 specification is as follows:

Silicon (Si): ≥ 75.0%

Carbon (C): ≤ 0.20%

Aluminum (Al): ≤ 1.5–2.0%

Phosphorus (P): ≤ 0.04%

Sulfur (S): ≤ 0.02%

Iron (Fe): Balance

The exact FeSi 75 chemical analysis can be customized according to customer requirements, especially for low aluminum Ferro Silicon 75 or specific steelmaking processes.

3. What is the silicon content in FeSi 75 grade?

The silicon content in FeSi 75 grade is typically 75% or higher, which distinguishes it from lower grades such as Ferro Silicon 65 or Ferro Silicon 72.

This high silicon concentration makes Ferro Silicon 75 particularly effective as a steel deoxidizer and silicon alloying agent, allowing precise silicon adjustment while minimizing impurity introduction. As a result, FeSi 75 is one of the most preferred grades for modern steel plants and foundries.

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