Silicon Iron 55/75 | Premium FeSi Alloy for Steelmaking, Deoxidation, Casting & Alloy Production
Industrial Challenge: Controlling Silicon Input for Steel & Alloy Production
In steelmaking and foundry operations, precise silicon addition is essential for:
- Deoxidation control in carbon and alloy steels
- Maintaining uniform steel chemistry for high-grade alloy steels
- Optimizing graphitization and melt stability in cast iron
- Reducing costs caused by repeated alloying corrections or inconsistent silicon recovery
Silicon Iron 55/75 from ZhenAn provides premium-grade FeSi with high silicon purity and controlled particle sizes, ensuring efficient deoxidation, precise alloying, and consistent casting performance.
FeSi 55 vs FeSi 75: Selecting the Optimal Silicon Iron Grade
FeSi 55 – Cost-Effective Industrial Silicon
- Silicon (Si): approx. 55%
- Moderate deoxidation power suitable for carbon steel and low-alloy steel
- Supports conventional gray and ductile iron casting
- Optimized for predictable furnace behavior and cost-efficiency
FeSi 75 – High-Purity Silicon for Alloy Steel
- Silicon (Si): approx. 75%
- Strong deoxidizer for high-grade and specialty steels
- Rapid melting with high silicon recovery
- Ideal for stainless steel, low-oxygen steel, and advanced alloy applications
Choosing the right FeSi grade ensures stable steel chemistry, predictable alloy performance, and consistent metallurgical results.
Chemical Composition of Silicon Iron FeSi 55/75
| 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 |
Composition can be tailored according to steel grade, furnace type, or foundry requirements.
Particle Size Options: Multi-Size FeSi 55/75 (10–50mm / 10–100mm)
- 10–50mm – fine granules for rapid dissolution in ladle treatment and secondary metallurgy
- 10–100mm – standard size for EAF, BOF, and foundry furnace charging
Controlled particle sizing reduces fines, improves silicon recovery, and ensures uniform melting, supporting industrial consistency.
Applications of Silicon Iron FeSi 55/75
Steelmaking: Deoxidation & Alloy Adjustment
- Primary and secondary deoxidation in carbon and alloy steels
- Silicon trimming for precise chemical control
- Supports clean steel production and minimizes inclusions
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 reactions
- Raw material for silicon-based chemical applications
Production Process: ZhenAn Premium FeSi 55/75
ZhenAn manufactures Silicon Iron 55/75 using submerged electric arc furnace smelting, combining:
- High-purity quartz as the silicon source
- Low-impurity carbon reductants
- Controlled smelting, tapping, and cooling cycles
Post-production processes include crushing, screening, magnetic separation, and batch-level chemical verification, ensuring industrial-grade consistency and reliable silicon recovery.
Quality Control for Industrial FeSi 55/75
Each batch is tested for:
- Stable silicon content
- Low sulfur and phosphorus
- Controlled aluminum and carbon levels
- Uniform particle size distribution
This ensures optimized furnace operation, efficient 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 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 suitable for standard alloy steel and cast iron, while FeSi 75 has high silicon content, rapid 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 recommended for fast and uniform dissolution, while 10–100mm granules are standard for bulk furnace charging.
Can FeSi 55/75 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 according to steel grade, furnace type, or metallurgical process.
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