Silicon Iron 55/75 | High Purity FeSi Alloy
Premium-grade industrial FeSi with reliable particle size distribution for efficient steel refining, precise alloying, and repeatable foundry results.
Industrial Challenge: Consistent Silicon Addition
In modern steelmaking and foundry operations, precise silicon control is crucial for:
- Effective steel deoxidation, minimizing oxygen-related defects
- Maintaining consistent alloy chemistry across carbon, alloy, and specialty steels
- Stabilizing graphitization and melt quality in gray and ductile iron
- Reducing operational costs from re-alloying, uneven silicon recovery, or additive overuse
FeSi 55 vs FeSi 75: Choosing the Right Grade
FeSi 55 - Standard Industrial Silicon for General Steel & Cast Iron
- Silicon (Si): approx. 55%
- Moderate deoxidation strength suitable for carbon and low-alloy steels
- Supports gray iron and ductile iron casting
- Optimized for cost-effective, predictable furnace performance
FeSi 75 - High-Purity Silicon for Alloy & Specialty Steels
- Silicon (Si): approx. 75%
- Stronger deoxidizer for medium-to-high alloy steels
- Faster melting with higher silicon recovery
- Ideal for stainless steel, low-oxygen steels, and specialty alloys
Selecting the correct FeSi grade ensures stable steel chemistry, efficient alloying, and predictable metallurgical performance.
Chemical Composition
| Element |
FeSi 55 (%) |
FeSi 75 (%) |
| Silicon (Si) |
53.0-58.0 |
74.0-80.0 |
| Iron (Fe) |
Balance |
Balance |
| Aluminum (Al) |
≤ 2.0 |
≤ 2.0 |
| Carbon (C) |
≤ 0.30 |
≤ 0.20 |
| Phosphorus (P) |
≤ 0.04 |
≤ 0.04 |
| Sulfur (S) |
≤ 0.02 |
≤ 0.02 |
Specifications can be customized based on steel grade, furnace type, or foundry requirements.
Particle Size Options
- 10-50mm - fine granules for rapid dissolution in ladle or secondary metallurgy
- 10-100mm - standard granules for EAF, BOF, and foundry furnace charging
Controlled particle sizing reduces fines, improves silicon recovery, and ensures uniform melting, supporting industrial consistency.
Applications
Steelmaking: Deoxidation & Alloying
- Primary and secondary deoxidation in carbon, alloy, and specialty steels
- Silicon adjustment for precise chemical control
- Minimizes inclusions and improves clean steel production
Foundry & Cast Iron Production
- Enhances 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 produces Silicon Iron 55/75 using submerged electric arc furnace technology, combining high-purity quartz as silicon source with low-impurity carbon reductants and controlled smelting, tapping, and cooling cycles.
Post-production processing includes crushing, grading, magnetic separation, and batch chemical verification, ensuring industrial-grade consistency and reliable silicon recovery.
Quality Control
Each batch undergoes strict quality assurance:
- 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 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 55/75 quality during storage and transport.
Why Choose ZhenAn FeSi 55/75
- 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 55/75
What is the difference between FeSi 55 and FeSi 75?
FeSi 55 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 suitable for standard furnace charging.
Can FeSi 55/75 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.
