Inoculant Ferro Silicon 65
Unlike standard ferrosilicon used primarily for deoxidation, this grade is engineered to stabilize graphite nucleation behavior during solidification, especially in high-volume casting environments where melt consistency directly impacts rejection rates and machining performance.
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Controlled Metallurgical Inoculation Alloy for Gray & Ductile Iron Casting Systems
FeSi65 Inoculant is a controlled silicon-based inoculation alloy designed for late-stage molten iron treatment in gray iron and ductile iron production.
Unlike standard ferrosilicon used primarily for deoxidation, this grade is engineered to stabilize graphite nucleation behavior during solidification, especially in high-volume casting environments where melt consistency directly impacts rejection rates and machining performance.
It is widely used in:
• Automotive casting components
• Pump and valve housings
• Heavy machinery structural castings
• Ductile iron pipe systems
• Induction furnace batch production
Controlled Chemical Composition
Each batch is produced under furnace-controlled refining conditions with strict element stability control.
|
Element |
Controlled Range (Wt%) |
Functional Role in Casting Process |
|
Si |
63.0 – 66.0% |
Promotes graphite nucleation and stabilizes eutectic transformation |
|
Al |
1.2 – 2.0% |
Forms fine oxide nuclei that assist graphite initiation |
|
Ca |
0.8 – 1.5% |
Improves inoculation efficiency and reduces fade sensitivity |
|
C |
≤ 0.5% |
Controlled to avoid unwanted free carbon formation |
|
S / P |
≤ 0.02–0.03% |
Maintains melt cleanliness and structural stability |
Particle Size Design & Furnace Compatibility
Particle sizing is engineered based on melt handling behavior and industrial feeding systems.
• 0.2–0.7 mm: Suitable for stream inoculation systems in automated pouring lines
• 1–3 mm: Standard ladle treatment for medium-scale casting operations
• 3–8 mm: Heavy ladle and extended pouring cycle applications
Recommended Application Rates
• Gray Iron: 0.15% – 0.35%
• Ductile Iron: 0.20% – 0.40% (post-nodularization treatment)
Actual consumption may vary depending on furnace type, cooling rate, and casting section thickness.
Metallurgical Function in Casting Process
During late-stage addition, FeSi65 acts by introducing active nucleation sites that influence graphite formation during solidification.
In industrial production, this typically results in:
• More stable graphite formation during eutectic transformation
• Reduced tendency for carbide (chill) formation in thin-wall sections
• Improved graphite distribution uniformity in gray iron
• Increased nodularity stability in ductile iron systems
From a production perspective, foundries typically use this material to improve:
• Casting consistency across batches
• Machining stability
• Reduction of scrap caused by microstructural variation
Production Stability & Quality Control
To ensure consistent performance in automated casting environments, each batch is produced under controlled metallurgical QA procedures:
• Optical Emission Spectroscopy (OES) verification per melt
• Controlled granulation and particle size screening
• Batch-level moisture and oxidation control testing
• Traceable COA issued per shipment
• Optional third-party inspection (SGS / BV) upon request
Packaging uses moisture-resistant jumbo bags with inner liners to minimize oxidation risk during long-distance transport.
Certificate
Furnace Compatibility & Process Conditions
FeSi65 performs effectively in:
Induction furnace melting systems
Electric arc furnace ladle treatment
Cupola furnace secondary inoculation
Automated stream inoculation systems
Recommended treatment temperature range
1380°C – 1460°C
(Performance varies depending on melt chemistry and holding time.)
Packaging & Handling
To reduce oxidation and moisture absorption during transport:
1 MT jumbo bags or 25 kg sealed bags available
Inner moisture-resistant lining optional
Palletized export packaging for long-distance shipment
Vacuum-sealed packaging available for high-precision applications
Proper packaging is particularly important for maintaining calcium activity, which directly affects inoculation performance.
FAQ
Q: What is the main advantage of FeSi65 compared to higher silicon grades like FeSi75?
A: FeSi75 is primarily optimized for silicon content and deoxidation. FeSi65 includes controlled Ca and Al levels, which support nucleation activity in cast iron solidification, especially in gray and ductile iron systems.
Q: Does aluminum content increase defect risk in castings?
A: At controlled levels (≤2.0%), aluminum contributes to nucleation behavior. However, its effect depends on melt humidity, molding system, and pouring temperature. Proper process control is required in all inoculation systems.
Q: What is the recommended addition temperature?
A: Typically between 1380°C and 1460°C to balance dissolution efficiency and inoculation stability. Lower or higher temperatures may affect performance consistency.
Q: Can FeSi65 reduce casting defects?
A: In industrial practice, it is commonly used to reduce variability-related defects such as chill formation, carbide spots, and uneven graphite distribution. Results depend on the overall casting system.
Q: Does particle size affect performance?
A: Yes, finer sizes react faster, while coarser grades provide longer-lasting inoculation.
Q: How does it improve machining performance?
A: By creating a more uniform microstructure, reducing hard spots and carbide formation.
Q: Is it suitable for automated feeding systems?
A: Yes, granulated forms are designed for stable flow in dosing equipment.
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