High-Quality Ferrosilicon FeSi 65/75
Industrial Silicon Iron for Steel, Casting & Metallurgy | 10–220mm
Industry Challenge: Optimizing Silicon Addition in Steelmaking & Casting
Steelmakers and foundries face ongoing issues when using ferrosilicon in high-volume operations:
- Uncontrolled silicon addition leading to over-oxidation or inconsistent steel chemistry
- Fines and uneven particle size affecting melting rates and furnace efficiency
- Graphitization issues in cast iron production
- Increased alloy consumption and operating costs due to variability
High-Quality Ferrosilicon FeSi 65/75 from ZhenAn addresses these pain points with precisely controlled silicon content, flexible granule sizes, and consistent industrial-grade quality, supporting reliable steelmaking, alloying, and foundry operations.
FeSi 65 vs FeSi 75: Choosing the Right Silicon Iron Grade
FeSi 65 – Balanced Silicon for Cost-Effective Alloying
- Silicon (Si): ~65%
- Moderate deoxidation strength for standard steel grades
- Ideal for carbon steel, low-alloy steel, and conventional foundry iron
- Optimized cost-to-performance ratio
FeSi 75 – High-Purity Silicon for Critical Alloying
- Silicon (Si): ~75%
- Strong deoxidizer for high-purity and alloy steels
- Fast melting with high recovery efficiency
- Supports stainless steel, special alloys, and secondary metallurgy
Selecting the right FeSi 65 or FeSi 75 grade ensures metallurgical precision, cost savings, and process stability.
Chemical Composition of Industrial Ferrosilicon 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 adjusted based on steel grade, furnace type, or foundry requirements.
Particle Size Options: FeSi 65/75 Granules 10–220mm
Optimized Granule Sizes for Industrial Steel & Foundry Use
- 10–50mm – rapid dissolution for ladle and secondary metallurgy
- 10–100mm – standard size for EAF, BOF, and foundry charging
- 10–220mm – coarse granules for bulk furnace addition, slower silicon release
Uniform sizing minimizes fines, improves silicon recovery, and ensures consistent furnace performance.
Applications of FeSi 65/75 in Steelmaking, Casting & Metallurgy
Ferrosilicon FeSi 65/75 for Steel Deoxidation & Alloying
- Primary and secondary deoxidation in carbon and alloy steel
- Silicon adjustment for low-oxygen steel grades
- Supports clean steel and inclusion control
FeSi 65/75 in Foundry & Cast Iron Production
- Graphitization enhancement in gray and ductile iron
- Improved melt fluidity and casting quality
- Stable silicon input for repeatable foundry processes
High-Purity FeSi for Metallurgical & Chemical Processes
- Base silicon for specialty alloys
- Reducing agent in metallurgical reactions
- Raw material for silicon-based industrial and chemical applications
Production Process: Electric Arc Furnace Industrial FeSi
ZhenAn produces FeSi 65/75 via submerged electric arc furnace smelting with:
- High-purity quartz
- Low-impurity carbon reductants
- Controlled smelting temperature and cooling cycles
Post-smelting processing includes crushing, grading, magnetic separation, and batch-level chemical verification, ensuring industrial reliability and consistent metallurgical behavior.
Quality Control for Industrial-Grade Ferrosilicon
Every batch of FeSi 65/75 undergoes strict QC for:
- Stable silicon content
- Low phosphorus and sulfur levels
- Controlled aluminum and carbon content
- Uniform particle size distribution
This ensures furnace efficiency, alloy yield optimization, and consistent product quality.
Packaging & Supply Options
- 1 MT jumbo bags
- 25 kg bags palletized
- Bulk shipment for long-term contracts
Packaging prevents moisture absorption and oxidation, maintaining FeSi 65/75 quality throughout storage and transit.
Why ZhenAn FeSi 65/75 Is the Trusted Choice
- 30+ years of ferroalloy production experience
- Expertise in steelmaking-grade and foundry-grade FeSi
- Flexible specifications and granule sizes
- Reliable long-term industrial supply
ZhenAn provides technical support and supply consistency, helping buyers avoid metallurgical variability and excessive alloy cost.
FAQ: Ferrosilicon FeSi 65/75
What is the difference between FeSi 65 and FeSi 75?
FeSi 65 has moderate silicon content and slower reaction, suitable for standard steel and foundry operations. FeSi 75 has high silicon content, faster melting, and stronger deoxidation, ideal for alloy steel and high-purity applications.
Which particle size is best for ladle or secondary metallurgy?
10–50mm granules are typically preferred for ladle treatment due to rapid and uniform dissolution.
Can FeSi 65/75 be used in ductile iron production?
Yes. Both grades support graphitization, melt stability, and casting quality.
How does ZhenAn ensure consistent FeSi quality?
Through strict electric arc furnace smelting, batch chemical verification, and controlled particle sizing, ZhenAn guarantees stable silicon recovery.
Can FeSi 65/75 specifications be customized?
Yes. ZhenAn can adjust silicon content, impurity limits, and granule sizes to meet specific steel grade or foundry process requirements.
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