Ferro Silicon Chemical Analysis

 

Ferrosilicon is a common ferroalloy, whose chemical composition is mainly silicon and iron. The composition ratio of ferrosilicon has an important impact on the properties and uses of the alloy. The silicon content is usually between 70% and 80%, and the iron content is between 20% and 30%. In addition to silicon and iron, ferrosilicon may also contain small amounts of carbon, aluminum, manganese, calcium, magnesium, and other elements. The content and proportion of these elements can be adjusted according to specific application requirements.
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 Main components

 Silicon (Si)

• Content range: Silicon is a key component of ferrosilicon, usually accounting for 10% to 95% of the total content, with the specific content determined by the product grade.
• Low-silicon ferrosilicon: Silicon content of 10% to 45% (such as FeSi25 and FeSi45), mainly used for steel deoxidation and alloying.
• High-silicon ferrosilicon: Silicon content 75% to 95% (such as FeSi75 and FeSi90), mainly used in casting inoculants, ferroalloy production reducing agents, etc.
• Function: Silicon is a strong deoxidizer that can remove oxygen from molten steel. At the same time, it can increase the hardness, wear resistance, and corrosion resistance of iron, and improve the mechanical properties of castings.

 Iron (Fe)

• Content range: As the base element, iron content typically ranges from 5% to 90%, inversely proportional to silicon content.
• Function: Forms the matrix of the alloy, ensuring the material's basic toughness and machinability.

 Impurity components

The impurity element content in ferrosilicon must meet industry standards.

 Carbon (C)

• Permissible content: usually ≤0.2% to 2.0% (high-silicon ferrosilicon requires even lower levels, such as FeSi90 with a carbon content ≤0.2%).
• Impact: Excessive carbon can cause gas holes and cracks in castings and reduce the weldability of steel, so it must be strictly controlled in precision casting and low-carbon steel production.

 Manganese (Mn)

• Permissible content: generally ≤0.5% to 1.5% (different grades have different requirements, low-manganese ferrosilicon ≤0.5%).
• Impact: a small amount of manganese has little effect on performance, but excessive amounts will increase the brittleness of steel. The manganese content needs to be strictly controlled, especially in low-temperature environments.

 Phosphorus (P)

• Permissible content: usually ≤0.02% to 0.07% (high-purity ferrosilicon requires ≤0.03%).
• Impact: Phosphorus is a harmful impurity that significantly reduces the plasticity and toughness of steel. It must be strictly limited in structural steel and low-temperature steel.

 Sulfur (S)

• Permissible content: generally ≤0.02% to 0.05%.
• Impact: Sulfur causes "hot brittleness" in steel, reducing its high-temperature processing performance. It must be strictly controlled in welding steels and heat-resistant steels.

 Aluminum (Al)

• Allowed content: Typically ≤0.5% to 2.0% (some grades, such as FeSi75, require ≤1.0%).
• Impact: A small amount of aluminum enhances deoxidation, but excessive amounts can cause inclusions in castings, affecting surface quality.