Ferrosilicon FeSi 75/65 | High Purity Silicon Iron for Steel Refining, Alloy Steel & Foundry
Industrial-grade Ferrosilicon Silicon Iron 65/75 from ZhenAn provides high-purity, metallurgical grade FeSi with controlled particle sizes for predictable alloying, efficient deoxidation, and consistent foundry results.
Industrial Challenge: Stable Silicon Addition in Steel and Foundry Operations
Steel and foundry operations require precise silicon addition for deoxidation and alloying. Common challenges include:
- Loss of silicon during furnace charging due to oxidation or fines
- Inconsistent silicon distribution impacting alloy steel quality
- Graphitization issues and unstable melt in gray or ductile iron
- Increased costs due to repeated alloying or corrective actions
FeSi 65 vs FeSi 75: Choosing the Right Metallurgical Silicon Iron
FeSi 65 – Balanced Silicon for Standard Alloying
- Silicon (Si): approx. 65%
- Moderate deoxidation capacity
- Suitable for carbon steel, low-alloy steel, and conventional foundry iron
- Optimized for cost-efficient alloying and predictable melt behavior
FeSi 75 – High-Purity Silicon for Advanced Steel Grades
- Silicon (Si): approx. 75%
- Strong deoxidizer for high-alloy and specialty steels
- Fast melting, high silicon recovery
- Ideal for stainless steel, high-purity alloy steel, and low-oxygen steel grades
Choosing the correct FeSi grade ensures stable steel chemistry, improved alloying efficiency, and consistent metallurgical performance.
Chemical Composition of Ferrosilicon Silicon Iron 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 according to steel grade or foundry requirements.
Particle Size Options: Multi-Size FeSi 65/75 Granules (10–220mm)
- 10–50mm – fine granules for ladle treatment and secondary metallurgy
- 10–100mm – standard size for EAF, BOF, and foundry charging
- 10–220mm – coarse granules for bulk furnace addition with slower silicon release
Consistent sizing minimizes fines, enhances silicon recovery, and stabilizes furnace operations.
Applications of Ferrosilicon Silicon Iron 65/75
Steelmaking: Deoxidation & Alloying
- Primary and secondary deoxidation in carbon and alloy steels
- Silicon trimming for precise chemistry 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 predictable silicon input for repeatable foundry results
Metallurgical & Chemical Applications
- Base silicon for specialty alloys
- Reducing agent in metallurgical processes
- Raw material for silicon-based industrial and chemical applications
Production Process: ZhenAn Metallurgical FeSi 65/75
ZhenAn manufactures Ferrosilicon Silicon Iron 65/75 using submerged electric arc furnace technology, including high-purity quartz as silicon source and low-impurity carbon reductants with controlled smelting, tapping, and cooling cycles.
Post-production processes include crushing, grading, magnetic separation, and batch-level chemical verification, ensuring industrial-grade consistency and predictable silicon yield.
Quality Control for Industrial FeSi 65/75
Each batch undergoes rigorous QC to ensure:
- Stable silicon content
- Low sulfur and phosphorus levels
- Controlled aluminum and carbon content
- Uniform particle size distribution
This guarantees efficient furnace operation, optimized alloy usage, and reliable 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 sizes
- 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 Silicon Iron 65/75
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What is the difference between FeSi 65 and FeSi 75?
FeSi 65 offers moderate silicon content suitable for standard alloy steel and cast iron, while FeSi 75 provides high silicon content, fast melting, and strong deoxidation for high-grade and specialty steels.
-
Which particle size is suitable for ladle or secondary metallurgy?
10–50mm granules are preferred for rapid dissolution and uniform reaction.
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Can FeSi 65/75 be used in ductile iron casting?
Yes. Both grades improve graphitization, melt stability, and casting quality.
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How does ZhenAn ensure consistent FeSi quality?
Through submerged electric arc furnace smelting, batch chemical verification, and precise particle sizing.
-
Can FeSi specifications be customized?
Yes. ZhenAn can adjust silicon content, impurity limits, and granule sizes based on furnace type, steel grade, or metallurgical process.
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