Product Specification

FeSi 55/65 | Premium Silicon Iron for Steelmaking, Deoxidation, Foundry & Alloy Steel | 10–220mm Industrial Grade

Industrial Challenge: Controlling Silicon for Consistent Steel and Cast Iron Quality

In steelmaking and foundry operations, precise silicon control is critical to:

• Achieve effective deoxidation and minimize oxygen-related defects

• Maintain consistent chemical composition in carbon and alloy steels

• Stabilize graphitization and melt quality in gray and ductile iron

• Reduce costs associated with re-alloying or inconsistent silicon recovery

FeSi 55/65 from ZhenAn provides premium-grade industrial FeSi with controlled particle sizing, ensuring efficient steel refining, precise alloying, and reliable casting results.

FeSi 55 vs FeSi 65: Choosing the Optimal Metallurgical Silicon Iron

FeSi 55 – Standard-Grade Industrial Silicon

• Silicon (Si): approx. 55%

• Moderate deoxidation power for carbon steel and low-alloy steel

• Supports gray iron and ductile iron casting

• Optimized for cost-efficient and predictable furnace operation

FeSi 65 – High-Purity Silicon for Alloy Steel

• Silicon (Si): approx. 65%

• Stronger deoxidizer for medium and high-alloy steels

• Faster melting with higher silicon recovery

• Suitable for stainless steel, low-oxygen steels, and specialty alloy applications

Selecting the appropriate grade ensures stable steel chemistry, optimized alloying, and predictable metallurgical performance.

Chemical Composition of FeSi 55/65

Specifications can be tailored based on steel grade, furnace type, or foundry requirements.

Particle Size Options: FeSi 55/65 Granules (10–220mm)

• 10–50mm – fine granules for rapid dissolution in ladle or secondary metallurgy

• 10–100mm – standard granules for EAF, BOF, and foundry furnace charging

• 10–220mm – coarse granules for bulk furnace addition and slower silicon release

Controlled particle sizing minimizes fines, improves silicon recovery, and ensures uniform melting, supporting industrial consistency.

Applications of FeSi 55/65

Steelmaking: Deoxidation & Alloying

• Primary and secondary deoxidation in carbon and alloy steels

• Silicon trimming for precise chemical control

• Reduces inclusions and supports clean steel production

Foundry & Cast Iron Production

• Promotes graphitization in gray and ductile iron

• Stabilizes melt fluidity and improves casting surface quality

• Provides predictable silicon input for repeatable foundry results

Alloy Steel & Metallurgical Uses

• Base silicon source for specialty alloys

• Reducing agent in metallurgical reactions

• Raw material for silicon-based chemical applications

Production Process: ZhenAn Premium FeSi 55/65

ZhenAn produces FeSi 55/65 using submerged electric arc furnace technology, combining:

• High-purity quartz as silicon source

• Low-impurity carbon reductants

• Controlled smelting, tapping, and cooling cycles

Post-production processes include crushing, grading, magnetic separation, and batch chemical verification, ensuring industrial-grade consistency and reliable silicon recovery.

Quality Control for Industrial FeSi 55/65

Each batch undergoes stringent quality checks:

• Stable silicon content

• Low phosphorus and sulfur levels

• Controlled aluminum and carbon content

• Uniform particle size distribution

This guarantees efficient furnace operation, optimized alloy usage, and consistent metallurgical results.

Packaging & Supply Options

• 1 MT jumbo bags

• 25 kg palletized bags

• Bulk shipment for long-term industrial supply

Packaging protects against moisture and oxidation, maintaining FeSi 55/65 quality during storage and transport.

Why Choose ZhenAn FeSi 55/65

• 30+ years of ferroalloy manufacturing expertise

• Specialized in steelmaking-grade, foundry-grade, and alloying FeSi

• Flexible specifications and particle sizing

• Reliable long-term industrial supply

ZhenAn partners with industrial buyers who require stable metallurgical performance, high silicon recovery, and consistent industrial-grade quality.

FAQ: Ferrosilicon FeSi 55/65

What is the difference between FeSi 55 and FeSi 65?

FeSi 55 provides moderate silicon content for standard alloy steel and cast iron, while FeSi 65 offers higher silicon content, faster melting, and stronger deoxidation for high-grade and specialty steels.

Which particle size is recommended for ladle or secondary metallurgy?

10–50mm fine granules are ideal for rapid and uniform dissolution, while 10–100mm / 10–220mm granules are suitable for bulk furnace charging.

Can FeSi 55/65 be used in ductile iron casting?

Yes. Both grades enhance graphitization, melt stability, and casting quality.

How does ZhenAn ensure consistent FeSi quality?

Through submerged electric arc furnace smelting, batch chemical verification, and precise particle sizing.

Can specifications be customized?

Yes. ZhenAn can adjust silicon content, impurity limits, and granule sizes according to steel grade, furnace type, or metallurgical process.