Product Specification

Silicon Iron 75/65 | Industrial FeSi Alloy for Steelmaking, Deoxidation, Casting & Alloy Steel | Multi-Size 10–50mm / 10–100mm

Industrial Challenge: Achieving Consistent Silicon Addition in Steelmaking

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

• Deoxidize steel effectively, minimizing oxygen-related defects

• Maintain consistent alloy chemistry for high-grade and specialty steels

• Improve graphitization and melt stability in gray and ductile iron

• Reduce operational costs caused by re-alloying or inconsistent silicon recovery

Silicon Iron 75/65 from ZhenAn delivers high-purity industrial-grade FeSi with controlled particle sizes, enabling efficient steel refining, precise alloying, and consistent casting results.

FeSi 65 vs FeSi 75: Choosing the Optimal Silicon Iron Grade

FeSi 65 – Balanced Industrial Silicon

• Silicon (Si): approx. 65%

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

• Supports standard foundry iron and ductile iron casting

• Optimized for cost-efficient and predictable furnace operation

FeSi 75 – High-Purity Silicon for Specialty Steels

• Silicon (Si): approx. 75%

• Strong deoxidizer for high-grade and alloy steels

• Rapid melting with high silicon recovery

• Ideal for stainless steel, low-oxygen steels, and advanced alloy applications

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

Chemical Composition of Silicon Iron FeSi 75/65

Composition can be customized based on steel grade, furnace type, or foundry requirements.

Particle Size Options: Multi-Size FeSi 75/65 (10–50mm / 10–100mm)

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

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

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

Applications of FeSi 75/65

Steelmaking: Deoxidation & Alloy Adjustment

• Primary and secondary deoxidation in carbon and alloy steels

• Silicon trimming for precise chemical control

• Supports clean steel production and minimizes inclusions

Foundry & Cast Iron Production

• Enhances graphitization in gray and ductile iron

• Stabilizes melt fluidity and improves casting surface quality

• Provides consistent 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 Industrial FeSi 75/65

ZhenAn produces Silicon Iron 75/65 using submerged electric arc furnace smelting, combining:

• High-purity quartz as silicon source

• Low-impurity carbon reductants

• Controlled smelting, tapping, and cooling parameters

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

Quality Control for Industrial FeSi 75/65

Each batch undergoes strict QC:

• Stable silicon content

• Low phosphorus and sulfur levels

• Controlled aluminum and carbon content

• Uniform particle size distribution

This guarantees efficient furnace operation, optimized alloy use, and consistent metallurgical performance.

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 75/65 quality during storage and transport.

Why Choose ZhenAn FeSi 75/65

• 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: Silicon Iron FeSi 75/65

What is the difference between FeSi 65 and FeSi 75?

FeSi 65 provides moderate silicon content for standard alloy steel and cast iron, while FeSi 75 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 granules are standard for bulk furnace charging.

Can FeSi 75/65 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 to meet specific steel grades, furnace types, or metallurgical processes.