Ferro Silicon Inoculant - Grades & Sizes | Bright Alloys

Ferro Silicon Inoculant Products

High-performance Standard FeSi Inoculants (Si 74%, 75%) for iron foundries and continuous casting applications

FeSi Inoculant Products

ferro silicon inoculant Si 74% granules for foundry casting - Bright Alloys
Standard

Ferro Silicon Inoculant 74%

Standard inoculant grade with 73-75% Si, 0.5-1.5% Ca, 0.5-1.5% Al

  • Universal inoculant for all iron types
  • Consistent performance and dissolution
  • Multiple size fractions available
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FeSi inoculant 75% size 0.2-0.8mm for ductile iron - Bright Alloys
Premium

Ferro Silicon Inoculant 75%

Premium inoculant with 74-76% Si, low trace elements, high purity

  • Superior nodularity in ductile iron
  • Excellent chill reduction
  • For demanding foundry applications
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Custom ferro silicon inoculant Si 65-75% - request a quote - Bright Alloys
Customizable

Custom Ferro Silicon Inoculant

Chemical composition and particle size fully adjustable to meet your specific foundry requirements

  • Tailor Si, Ca, Al, and other element content based on your iron type and casting conditions
  • Custom particle size distribution available to optimize dissolution rate and inoculation efficiency
  • Formulated for gray iron, ductile iron, compacted graphite iron, and special applications
  • Precise control of trace elements to meet your quality specifications
  • Flexible packaging options available upon request
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Different Inoculants and Mold-Powders Comparison

GradeSi (%)Ba (%)Al (%)Ca (%)Fe & othersTypical use
Ferro Silicon Inoculant 74%74-75–≤1.50.5-1.5BalanceGeneral grey and ductile iron castings
Ferro Silicon Inoculant 75%75-78–≤1.5≤0.5-1.5BalanceHigh-grade ductile iron and thin-wall castings
Custom Ferro Silicon InoculantOn request–On requestOn requestBalanceTailored Si, Al, Ca and particle size

What Is Ferro Silicon Inoculant?

Ferro silicon inoculant is a controlled-aluminium ferrosilicon used to nucleate graphite in grey and ductile iron, so that the casting solidifies with the intended graphite form instead of chill or carbides.

Bright Alloys supplies FeSi 74% and 75% inoculant grades in lumps, granules and fine powder, with aluminium and calcium levels set for your iron and section thickness.

Applications and Performance

Grey Iron Inoculation

In grey iron the inoculant increases eutectic cell count and reduces chill depth, giving uniform hardness and better machinability.

Ductile Iron Post-Inoculation

Added after spheroidizing, FeSi inoculant restores the nuclei consumed by magnesium, raising nodule count and ferrite content.

Thin-Wall and Safety Castings

Automotive safety parts and pressure pipe fittings use the 75% grade, where section thickness is low and cooling is fast.

Why Choose Bright Alloys Ferro Silicon Inoculant

Technical Support & Services

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Technical Consultation

Our metallurgical experts provide application guidance and technical support for optimal alloy selection and usage.

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Custom Formulations

We develop tailored alloy compositions to meet specific customer requirements and application needs.

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Logistics Solutions

Efficient global supply chain management ensuring timely delivery and optimal packaging for product integrity.

Can't Find What You're Looking For?

We specialize in custom alloy formulations. Contact us with your specific requirements for a tailored solution.

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Ferro Silicon Inoculant FAQs

What is ferro silicon inoculant used for in foundry casting? +

Ferro silicon inoculant is added to molten iron to control graphite structure and reduce chill, ensuring consistent mechanical properties in gray and ductile iron castings. Our standard 74% FeSi inoculant is widely used in automotive and heavy machinery foundries.

What are the typical grades and sizes of ferro silicon inoculant? +

Common grades include Si 74% and 75%, with controlled calcium and aluminum. Particle sizes range from 0.2–0.8mm, 1–3mm, 3–8mm granules to 0–0.3mm powder. Explore our 75% premium inoculant for critical ductile iron applications.

How to choose the right inoculant for gray iron vs. ductile iron? +

Gray iron typically uses standard 74% FeSi inoculant for chill reduction, while ductile iron benefits from higher purity 75% grade for better nodularity. Our full product range includes barium-bearing variants for heavy sections.

What is the recommended addition rate of ferro silicon inoculant? +

Addition rates vary from 0.1% to 0.5% of metal weight, depending on base iron composition and casting section thickness. Contact our technical team for a tailored recommendation based on your melting practice.

How to request a quote and check quality certifications? +

Simply visit our Get Quotation page to submit your requirements. All our inoculants are produced under ISO 9001 certification with full chemical and sieve analysis reports available for every shipment.

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