Ferrosilicon 75/65 | High Purity FeSi for Steelmaking, Deoxidation, Foundry & Alloy Steel Applications
Industrial Challenge: Efficient Silicon Addition in Steelmaking and Foundry
Silicon plays a critical role in deoxidation, alloying, and foundry processes, but industrial operations often encounter challenges:
- Silicon loss from oxidation or fines during furnace charging
- Inconsistent silicon addition affecting steel and alloy chemical composition
- Graphitization and melt uniformity problems in gray and ductile iron
- Increased costs from repeated alloying adjustments or corrective actions
Ferrosilicon 75/65 from ZhenAn provides high-purity, industrial-grade FeSi with controlled particle sizes, ensuring predictable alloying, optimized deoxidation, and consistent foundry outcomes.
FeSi 65 vs FeSi 75: Selecting the Right Metallurgical Silicon Iron
FeSi 65 – Standard Industrial Silicon
- Silicon (Si): approx. 65%
- Moderate deoxidation power
- Suitable for carbon steel, low-alloy steel, and standard foundry iron
- Optimized for cost-efficient alloying and predictable melt behavior
FeSi 75 – High-Purity Silicon for Advanced Applications
- Silicon (Si): approx. 75%
- Strong deoxidizer for high-grade and alloy steels
- Fast melting, high recovery efficiency
- Ideal for stainless steel, specialty alloys, and low-oxygen steel grades
Choosing the correct grade ensures stable steel chemistry, improved alloying efficiency, and consistent metallurgical results.
Chemical Composition of Ferrosilicon 75/65
| 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 for specific steel grades or foundry requirements.
Particle Size Options: Multi-Size FeSi 75/65 (10–100mm / 10–220mm)
- 10–100mm – standard granules for EAF, BOF, and foundry charging
- 10–220mm – coarse granules for bulk furnace addition, slower silicon release
Consistent sizing minimizes fines, improves silicon recovery, and stabilizes furnace performance.
Applications of Ferrosilicon FeSi 75/65
Steelmaking: Deoxidation & Alloying
- Primary and secondary deoxidation in carbon and alloy steels
- Silicon adjustment for precise steel chemistry
- Supports clean steel production and reduces inclusions
Foundry & Cast Iron Production
- Enhances graphitization in gray and ductile iron
- Stabilizes melt fluidity and casting surface quality
- Provides consistent silicon input for repeatable foundry results
Alloy Steel & Metallurgical Applications
- Base silicon source for specialty alloys
- Reducing agent in metallurgical reactions
- Raw material for silicon-based industrial and chemical processes
Production Process: ZhenAn Industrial FeSi 75/65
ZhenAn manufactures Ferrosilicon 75/65 using submerged electric arc furnace smelting, including:
- High-purity quartz as silicon source
- Low-impurity carbon reductants
- Controlled smelting, tapping, and cooling cycles
Post-production 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 stringent QC to ensure:
- Stable silicon content
- Low phosphorus and sulfur
- Controlled aluminum and carbon content
- Uniform particle size distribution
This guarantees furnace efficiency, 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, preserving FeSi 75/65 quality during storage and transportation.
Why ZhenAn FeSi 75/65 is Trusted
- 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 supports industrial buyers who require stable metallurgical performance, high silicon recovery, and consistent industrial-grade quality.
FAQ: Ferrosilicon 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 high silicon content, fast melting, and strong deoxidation for high-grade and specialty steels.
Which particle size is best for ladle or secondary metallurgy?
10–100mm granules are standard, while 10–50mm fine granules are preferred for rapid and uniform dissolution.
Can FeSi 75/65 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 ZhenAn customize FeSi 75/65 specifications?
Yes. ZhenAn can adjust silicon content, impurity limits, and granule sizes to meet specific steel grades, furnace types, or metallurgical processes.
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