Ferrosilicon 55/65 | High Purity FeSi for Steel Refining, Deoxidation, Foundry & Alloy Applications
Industrial Challenge: Maintaining Stable Silicon Input in Steelmaking and Foundry
In modern steelmaking and foundry operations, precise silicon control is crucial for:
- Effective steel deoxidation and reduction of oxygen-related defects
- Maintaining consistent chemical composition in carbon and alloy steels
- Stabilizing graphitization and melt quality in gray and ductile iron
- Minimizing costs due to re-alloying or inconsistent silicon recovery
Ferrosilicon 55/65 from ZhenAn offers high-purity industrial-grade FeSi with controlled particle sizes, ensuring efficient steel refining, precise alloying, and consistent foundry results.
FeSi 55 vs FeSi 65: Selecting 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-effective, 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 high silicon recovery
- Suitable for advanced steel grades, specialty alloys, and low-oxygen steels
Selecting the right FeSi grade ensures stable steel chemistry, improved alloying efficiency, and consistent metallurgical performance.
Chemical Composition of Ferrosilicon 55/65
| Element |
FeSi 55 (%) |
FeSi 65 (%) |
| Silicon (Si) |
53.0-58.0 |
63.0-68.0 |
| Iron (Fe) |
Balance |
Balance |
| Aluminum (Al) |
≤ 2.0 |
≤ 2.0 |
| Carbon (C) |
≤ 0.30 |
≤ 0.25 |
| Phosphorus (P) |
≤ 0.04 |
≤ 0.04 |
| Sulfur (S) |
≤ 0.02 |
≤ 0.02 |
Specifications can be adjusted to meet specific steel grades, furnace types, or foundry requirements.
Particle Size Options: FeSi 55/65 Granules (10-100mm / 10-220mm)
- 10-100mm - standard size for EAF, BOF, and ladle treatment
- 10-220mm - coarse granules for bulk furnace addition with slower silicon release
Controlled sizing reduces fines, improves silicon recovery, and ensures uniform melting, supporting industrial consistency and process reliability.
Applications of Ferrosilicon 55/65
Steel Refining: Deoxidation & Alloying
- Primary and secondary deoxidation in carbon and alloy steels
- Silicon adjustment for precise chemical control
- Minimizes 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 High-Purity FeSi 55/65
ZhenAn produces Ferrosilicon 55/65 using submerged electric arc furnace technology, including:
- High-purity quartz as silicon source
- Low-impurity carbon reductants
- Controlled smelting, tapping, and cooling cycles
Post-production processing involves 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 QC:
- Stable silicon content
- Low phosphorus and sulfur levels
- Controlled aluminum and carbon content
- Uniform particle size distribution
This ensures 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 best for ladle or secondary metallurgy?
10-100mm standard granules are ideal for general furnace charging; 10-50mm fine granules are preferred for rapid and uniform dissolution.
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 to meet specific steel grades, furnace types, or metallurgical processes.
