FeSi 65/75 | Industrial Grade Silicon Iron for Steelmaking, Deoxidation, Foundry & Alloy Steel
10–220mm Granules
Industrial Challenge: Controlling Silicon for Consistent Steel and Cast Iron Quality
In modern steelmaking and foundry operations, precise silicon addition is crucial for:
- Achieving stable deoxidation and minimizing oxygen-related defects
- Maintaining consistent alloy composition for high-grade steels
- Improving graphitization and melt stability in ductile and gray iron
- Reducing costs caused by re-alloying or process variability
FeSi 65/75 from ZhenAn delivers industrial-grade, high-purity silicon iron with controlled particle sizing, providing reliable performance for steel refining, alloying, and foundry operations.
FeSi 65 vs FeSi 75: Selecting the Optimal Metallurgical Silicon Iron
FeSi 65 - Balanced Silicon for Standard Applications
- Silicon (Si): approx. 65%
- Moderate deoxidation power, suitable for carbon steel and low-alloy steel
- Supports conventional foundry iron and ductile iron casting
- Optimized for cost-effective and predictable furnace operation
FeSi 75 - High-Purity Silicon for Advanced Steel Grades
- Silicon (Si): approx. 75%
- Strong deoxidizer for high-grade and alloy steels
- Fast melting with high silicon recovery
- Ideal for stainless steel, specialty alloys, and low-oxygen steel production
Selecting the correct FeSi grade ensures stable steel chemistry, optimized alloying, and consistent metallurgical results.
Chemical Composition of FeSi 65/75
| Element |
FeSi 65 (%) |
FeSi 75 (%) |
| Silicon (Si) |
63.0-68.0 |
74.0-80.0 |
| Iron (Fe) |
Balance |
Balance |
| Aluminum (Al) |
≤ 2.0 |
≤ 2.0 |
| Carbon (C) |
≤ 0.25 |
≤ 0.20 |
| Phosphorus (P) |
≤ 0.04 |
≤ 0.04 |
| Sulfur (S) |
≤ 0.02 |
≤ 0.02 |
Composition can be customized based on steel grade, furnace type, or foundry requirements.
Particle Size Options: FeSi 65/75 Granules (10-220mm)
- 10-50mm - fine granules for ladle treatment and secondary metallurgy
- 10-100mm - standard granules for EAF, BOF, and foundry charging
- 10-220mm - coarse granules for bulk furnace addition and slower silicon release
Controlled particle sizes minimize fines, improve silicon recovery, and ensure uniform melting, supporting industrial consistency.
Applications of FeSi 65/75
Steelmaking: Deoxidation & Alloying
- Primary and secondary deoxidation in carbon and alloy steels
- Silicon adjustment for precise chemical control
- Reduces inclusion formation 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 consistent silicon input for repeatable foundry results
Alloy Steel & Metallurgical Uses
- Base silicon source for specialty alloys
- Reducing agent in metallurgical processes
- Raw material for silicon-based chemical applications
Production Process: ZhenAn Industrial FeSi 65/75
ZhenAn produces FeSi 65/75 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 includes crushing, grading, magnetic separation, and batch chemical verification, ensuring industrial-grade consistency and reliable silicon recovery.
Quality Control for Industrial FeSi 65/75
Each batch undergoes rigorous QC:
- Stable silicon content
- Low phosphorus and sulfur
- Controlled aluminum and carbon content
- Uniform particle size distribution
This guarantees efficient furnace operation, optimized alloy use, 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 65/75 quality during storage and transport.
Why Choose ZhenAn FeSi 65/75
- 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: FeSi 65/75
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 high silicon content, fast melting, and strong deoxidation for high-grade and specialty steels.
Which particle size is best for ladle or secondary metallurgy?
10-50mm fine granules are preferred for rapid and uniform dissolution, while 10-100mm granules are standard for bulk furnace charging.
Can FeSi 65/75 be used in ductile iron casting?
Yes. Both grades improve 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.
