High-Purity Ferrosilicon FeSi 55 | 55–75% Si Alloy
Ferrosilicon FeSi 55 for Stable Deoxidation and Process Consistency in Steelmaking
In modern steelmaking and alloy production, process instability caused by inconsistent deoxidizers, high impurity levels, or uncontrolled particle size directly leads to yield loss, inclusion defects, and fluctuating mechanical properties.
Ferrosilicon FeSi 55, with a controlled silicon content and balanced iron matrix, is widely selected by mills that prioritize predictable deoxidation kinetics, clean steel requirements, and cost efficiency.
ZhenAn supplies high-purity Ferrosilicon FeSi 55, engineered for converter steelmaking, electric arc furnaces (EAF), alloy steel refining, and secondary metallurgy, with tight control over chemistry and sizing.
Why Steelmakers Choose Ferrosilicon FeSi 55 Instead of Higher-Silicon Grades
While FeSi 65 or FeSi 75 deliver higher silicon recovery, many steel plants intentionally select FeSi 55 to address specific operational challenges:
- Reduced risk of over-siliconization in low-Si steel grades
- More controlled reaction intensity during deoxidation
- Lower dusting and splash loss in EAF and ladle addition
- Improved cost-to-recovery balance for carbon and low-alloy steels
For mills producing rebar, structural steel, wire rod, and general alloy steel, FeSi 55 offers a stable and economical silicon source.
Ferrosilicon FeSi 55 Chemical Composition (Typical)
FeSi 55 Standard Composition for Industrial Steelmaking
| Element |
Content (%) |
| Silicon (Si) |
55.0 – 60.0 |
| Iron (Fe) |
Balance |
| Aluminum (Al) |
≤ 2.0 |
| Carbon (C) |
≤ 0.20 |
| Phosphorus (P) |
≤ 0.04 |
| Sulfur (S) |
≤ 0.02 |
Composition can be adjusted to meet specific furnace practices or alloy standards.
FeSi 55 Particle Size Options for Controlled Melting Behavior
Available Ferrosilicon FeSi 55 Sizes
- 10–50 mm – fast melting, precise ladle additions
- 10–100 mm – standard size for converter and EAF charging
- Custom sizes available upon request
Carefully screened sizing ensures uniform melting, reduces fines generation, and improves silicon recovery efficiency.
Key Applications of Ferrosilicon FeSi 55 in Metallurgical Processes
FeSi 55 for Steel Deoxidation and Grain Structure Control
- Primary and secondary deoxidation in carbon steel
- Oxygen control in continuous casting
- Reduction of oxide inclusions
FeSi 55 for Alloy Steel and Specialty Grades
- Silicon adjustment in low-alloy steel
- Controlled Si input for spring steel and engineering steel
- Base alloy for further alloying additions
Ferrosilicon FeSi 55 in Foundry and Cast Iron Production
- Graphitization support in gray and ductile iron
- Improved fluidity and casting surface quality
- Stable silicon source for repeatable melts
Production Process Control Behind ZhenAn Ferrosilicon FeSi 55
ZhenAn Ferrosilicon FeSi 55 is produced in submerged electric arc furnaces using:
- High-purity quartz
- Low-ash carbon reductants
- Controlled smelting temperatures
Post-smelting, the alloy undergoes crushing, screening, magnetic separation, and chemical analysis, ensuring consistency across batches—critical for mills operating continuous or high-throughput furnaces.
Quality Assurance for Industrial-Grade Ferrosilicon FeSi 55
Each batch is verified for:
- Chemical composition stability
- Particle size distribution
- Low sulfur and phosphorus content
- Minimal fines and dust
This quality discipline supports process repeatability, a key concern for steelmakers operating under tight tolerance specifications.
Packaging and Logistics for Bulk Ferrosilicon FeSi 55 Supply
- 1 MT big bags
- 25 kg bags on pallets
- Bulk shipment options for long-term supply contracts
Packaging is designed to minimize oxidation, moisture ingress, and material loss during transport and storage.
Why Global Buyers Source Ferrosilicon FeSi 55 from ZhenAn
- 30 years of ferroalloy manufacturing experience
- Dedicated focus on steelmaking and alloy production needs
- Flexible chemistry and sizing customization
- Proven supply reliability for long-term contracts
ZhenAn works with steel mills, alloy producers, and industrial procurement teams seeking technical reliability, not commodity variability.
FAQ: Ferrosilicon FeSi 55 Technical Questions
What is the difference between FeSi 55 and FeSi 75 in steelmaking?
FeSi 55 provides more controlled silicon input and is preferred for steels requiring lower Si levels, while FeSi 75 is used when high silicon recovery is critical.
Is Ferrosilicon FeSi 55 suitable for electric arc furnaces?
Yes. FeSi 55 is widely used in EAF steelmaking due to its stable reaction behavior and reduced splashing.
What particle size of FeSi 55 is best for ladle addition?
10–50 mm is commonly selected for ladle metallurgy due to faster melting and precise composition control.
Can FeSi 55 be used in cast iron production?
Yes. It supports graphitization and silicon adjustment in gray and ductile iron casting.
Does ZhenAn offer customized FeSi 55 specifications?
ZhenAn can tailor silicon content, impurity limits, and size distribution based on furnace type and steel grade requirements.
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