Description of FeSiMg Nodulizer
Nodulizer, also known as Rare Earth Ferro Silicon Magnesium Nodulizer or Ferro Silicon Magnesium(FeSiMg), is an additive that can promote the crystallization of graphite into spherical cast iron. The main component of "Nodulizer agent" is nodularizing elements, such as Mg, Ce, Ca, etc.
The ferro-silicon magnesium nodularizer can significantly enhance the strength of cast iron. It also features the function of degasification, desulfurization, and deoxidation. The FeSiMg is widely used in the metallurgy and steel-making industry.
Size: 5~15 mm, 3~25mm, 8~40mm, 25~50mm, or as per customers' requirements.
Storage: Dry storage. Avoid contact with moisture.
Specification of FeSiMg Nodulizer
| Grade | Re | Mg | Si | Ca | Al |
| FeSiMg1-6 | 0.5-2.0% | 5-7% | 44%min | 2.0-3.0% | 1%max |
| FeSiMg2-7 | 1.0-3.0-% | 6-8% | 44%min | 2.0-3.5% | 1%max |
| FeSiMg3-8 | 2.0-4.0% | 7-9% | 44%min | 3.5-4.0% | 1%max |
| FeSiMg5-8 | 4.0-6.0% | 7-9% | 44%min | 4.0-5.0% | 1%max |
| FeSiMg7-9 | 6.0-8.0% | 8-10% | 44%min | 4.0-5.0% | 1%max |
The Use of Ferro Silicon Magnesium
• Ferro Silicon Magnesium for Steelmaking
Ferro Silicon Magnesium (FeSiMg) alloy, often containing rare earth elements, is widely used in steelmaking as a deoxidizer and alloying agent. It effectively reduces oxygen content in molten steel, minimizes oxide inclusions, and lowers carbon content, thereby improving steel cleanliness and cost-efficiency. The addition of Mg and Si optimizes the steel's microstructure, enhancing strength, toughness, wear resistance, and corrosion resistance.
• Ferro Silicon Magnesium for Foundry Applications
In foundry operations, FeSiMg serves as a key nodularizing agent for ductile iron production. It promotes the formation of spheroidal graphite during solidification, refining the microstructure and significantly improving the mechanical properties of cast iron. This results in enhanced tensile strength, ductility, and fatigue resistance, along with improved wear and corrosion resistance, extending the service life of cast components.
• Ferro Silicon Magnesium for the Automotive Industry
FeSiMg plays a vital role in automotive manufacturing, particularly in producing high-performance components such as cylinder heads, crankshafts, valve springs, and suspension parts. Its use enables weight reduction while maintaining structural integrity, contributing to improved engine efficiency, durability, and overall vehicle performance.
Case Study
Background
A mid-sized foundry in Germany, specializing in automotive components (crankshafts and suspension knuckles), faced inconsistent nodule counts and recurring shrinkage porosity. Their existing FeSiMg nodulizer caused magnesium fade, leading to rejected batches (up to 8% scrap rate) and increased production costs.
Challenge
The foundry needed a nodulizer that ensures:
Stable Mg recovery (target: 4.2–4.8%)
High nodularity (≥90% per ISO 1083)
Minimal fading during 10-minute holding times
Reduced slag formation
Solution
They switched to a high-quality FeSiMg nodulizer with the following specifications:
Composition: Mg 5.5–6.0%, RE (rare earth) 0.8–1.2%, Ca 1.5–2.0%, Si 44–48%
Controlled impurities: Al <0.5%, Ti <0.3%
Grain size: 4–25 mm (uniform, dust-free)
Implementation
The new nodulizer was introduced via sandwich method in a 1,500 kg ladle. Process adjustments:
Addition rate: 1.15% (vs. previous 1.35%)
Pouring temperature: 1,420–1,450°C
Holding time under 8 minutes
Results (after 50 heats)
| Parameter | Old Nodulizer | High-Quality FeSiMg | Improvement |
|---|---|---|---|
| Mg recovery | 42% | 61% | +45% |
| Nodularity | 82% | 94% | +12% |
| Nodule count (/mm²) | 180 | 260 | +44% |
| Scrap rate | 8.2% | 2.1% | -74% |
| Slag weight (kg/heat) | 28 | 12 | -57% |
Key observations:
Consistent microstructure with fine, rounded graphite nodules (size 6–7)
Eliminated carbide formation at thin sections (5 mm)
20% longer ladle refractory life due to reduced slag aggressiveness
Lower rare earth content prevented chunky graphite in heavy sections (60 mm)
Conclusion
By adopting a high-quality FeSiMg nodulizer with optimized Mg/RE/Ca balance and strict impurity control, the foundry achieved:
Annual savings of €185,000 (reduced rework, higher yield)
Customer approval for zero-defect shipments
Ability to produce ductile iron grades EN-GJS-500-7 and 600-10 reliably
Recommendation
For foundries targeting high nodularity (>90%) and low scrap, investing in a premium FeSiMg nodulizer pays back within 3 months through process stability and material efficiency. Always verify grain size distribution and RE content relative to section thickness.
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