company news about What are the main grades of ferrosilicon ?

The main grades of ferrosilicon (FeSi) are classified primarily by silicon (Si) content, because silicon percentage determines deoxidation strength, alloying efficiency, cost, and application suitability in steelmaking and foundry operations.

Below is a steel-industry–focused overview of the grades that are actually used in practice.

Most widely used grade in modern steelmaking

Key characteristics

• Strong and fast deoxidation
• High silicon recovery
• Lower aluminum and phosphorus than lower grades
• Stable performance in ladle refining

Typical applications

• Final deoxidation in steelmaking
• Alloy steel production
• High-quality carbon steel
• Electrical steel

Cost-effective alternative to FeSi 75

Key characteristics

• Slightly lower Si than FeSi 75
• Similar deoxidation behavior
• Competitive cost-performance ratio

Typical applications

• Bulk steel deoxidation
• General alloy steel
• Plants optimizing material cost

Balanced grade for steel and foundry use

Key characteristics

• Moderate deoxidation strength
• Good solubility in molten iron
• More economical per ton

Typical applications

• Carbon steel production
• Cast iron metallurgy
• Foundry inoculation
• Intermediate deoxidation

Used mainly in foundry and special applications

Key characteristics

• Lower deoxidation power
• Higher iron content
• Stable dissolution in molten iron

Typical applications

• Cast iron inoculation
• Ductile and gray iron
• Special metallurgical processes

• Reduced Al content
• Improves steel cleanliness
• Used in high-quality steel grades

• Adds calcium for inclusion modification
• Reduces nozzle clogging
• Used in continuous casting

Steel plants select FeSi grade based on:

• Required silicon addition level
• Steel grade specifications
• Furnace type (BOF, EAF, IF)
• Cost vs recovery efficiency
• Impurity limits (Al, C, P, S)

The main grades of ferrosilicon are:

• FeSi 75 – high-purity, high-performance steel deoxidation
• FeSi 72 – cost-efficient steelmaking
• FeSi 65 – versatile steel and foundry use
• FeSi 45 – cast iron and specialty metallurgy

Each grade serves a distinct metallurgical purpose, and they are not interchangeable in professional steelmaking.