FeSi75

High Purity Ferro Silicon 75 (FeSi75) is a premium-grade alloy composed of 74-80% silicon (Si) and 20-26% iron (Fe), with ultra-low impurities. It is a critical deoxidizer, alloying agent, and nodularizer in steelmaking, foundries, and advanced industrial applications.

With its exceptional purity and performance, FeSi75 ensures cleaner, stronger, and more durable steel, making it indispensable for modern metallurgy, electronics, and chemical industries.

Superior Deoxidization

Removes oxygen from molten steel, preventing porosity and defects.

Enhanced Steel Strength & Durability

Improves hardness, corrosion resistance, and magnetic properties in alloy steels.

 Low Impurity Levels

Ultra-low Al, C, P, and S ensure high-purity output for critical applications.

 Excellent Nodularization in Cast Iron

Promotes spherical graphite formation in ductile iron, enhancing ductility and strength.

 Energy & Cost Efficient

Reduces slag formation, refining time, and overall production costs.

 Wide Industrial Compatibility

Suitable for steel, foundries, semiconductors, and chemical processes.

Steelmaking Industry

Deoxidizer: Eliminates oxygen for cleaner steel production.

Alloying Agent: Enhances hardness, heat resistance, and machinability.

 Foundry & Cast Iron Production

Nodularizer: Converts graphite into spherical nodules in ductile iron.

Improves casting quality with fewer defects.

 Electronics & Semiconductors

Used in silicon wafer manufacturing for solar cells, microchips, and electronic components.

Chemical & Metal Production

Acts as a reducing agent in magnesium, copper, and rare earth metal production.

Used in silicone polymers, resins, and specialty chemicals.

 Welding & Electrodes

Enhances arc stability and weld quality in electrode coatings.

 Premium Quality Assurance – Strict ISO & ASTM compliance with low impurity guarantees.
 Customizable Sizes & Forms – Lumps, powder, granules (as per your needs).
 Global Supply Chain – Reliable logistics for timely deliveries worldwide.
 Competitive Pricing – Cost-effective without compromising quality.
 Technical Support – Expert guidance for optimal alloy selection & usage.

Q1: What's the difference between FeSi75 and standard Ferro Silicon?

FeSi75 has higher Si content (75%) and lower impurities, making it ideal for high-performance applications like electronics and premium steel.

Q2: Can FeSi75 be used in ductile iron production?

Yes! It's a key nodularizing agent, improving graphite structure and mechanical properties.

Q3: What sizes are available?

Standard sizes: 10-50mm, 50-100mm. Custom sizes (powder, granules) available upon request.

Q4: How does FeSi75 improve steel quality?

By removing oxygen, reducing inclusions, and enhancing alloy properties, resulting in stronger, cleaner steel.

Q5: Do you provide bulk orders?

Absolutely! We supply container loads (20-25MT) with flexible packaging options.

Q6: What industries benefit most from FeSi75?

Steel mills, foundries, semiconductor manufacturers, and chemical industries rely on it for superior performance.

Background – A specialty steel mill manufacturing 20MnCr5 case-hardening steel for heavy-duty truck axles encountered persistent quality issues related to internal porosity. Ultrasonic inspection during final machining revealed centerline porosity in approximately 11% of all forged axle shafts, causing components to fail fatigue life requirements under cyclic loading conditions. Traditional deoxidation using aluminum alone generated alumina (Al₂O₃) inclusions-hard, irregular particles that failed to float out completely during secondary refining, instead becoming entrapped in the solidifying interdendritic regions. These rigid inclusions physically blocked liquid flow through mushy zone channels, leading to micro-shrinkage and centerline porosity. The plant had previously attempted to address this by increasing aluminum addition, which only worsened inclusion populations without solving the fluidity problem. Rejection rates were costing the plant an estimated 800,000 yuan monthly in scrapped material and rework.

Solution Implementation – The metallurgical team redesigned the deoxidation practice to incorporate FeSi75 as the primary deoxidizer, reserving aluminum only for final trim deoxidation. Under the new protocol, FeSi75 (standard grade with 75% Si, 0.5% max Al, and 1.0% max Ca) was added to the ladle during tapping at a rate of 3.5 kg per ton of steel. Silicon reacted with dissolved oxygen in the molten steel to form fluid, globular manganese-silicate inclusions rather than solid alumina particles. These low-melting-point silicates coalesced readily and floated to the slag layer within 15 minutes of argon stirring. Only trace aluminum was added downstream to achieve final dissolved oxygen below 25 ppm. The plant also adjusted the inclusion engineering target-rather than eliminating all oxides, the goal became transformation to harmless morphologies.

Results – After full implementation of the FeSi75-based deoxidation practice across all 20MnCr5 heats, the incidence of ultrasonic-detected centerline porosity fell from 11.3% to 2.1% within three months. Examination of rejected material showed that the remaining porosity resulted primarily from mold powder entrainment or gas bubbles rather than inclusion-induced shrinkage. Fatigue testing on production axles revealed a 23% improvement in average cycle life, with the minimum life exceeding customer specifications by a significant margin. The cleaner steel also enabled a 12% reduction in machining tool wear during final gear cutting and shaft finishing operations. Inclusion analysis by scanning electron microscopy confirmed the transition: average inclusion size decreased slightly, and more importantly, the remaining inclusions were primarily globular manganese-silicates rather than angular alumina clusters. Total deoxidation cost per ton decreased by 12 yuan due to the lower unit cost of FeSi75 compared to aluminum wire. The plant subsequently extended the FeSi75-based practice to other case-hardening grades, achieving consistent porosity control and improved machinability across their entire product portfolio.

Broader Industrial Impact

The truck axle case illustrates a core metallurgical principle: effective deoxidation is not merely about removing oxygen but also about controlling inclusion characteristics. FeSi75 produces fluid, removable silicates where aluminum alone leaves behind problematic solid alumina. Similar benefits are observed across the steel industry. Producers of tire cord and spring steel use FeSi75 to maintain inclusion deformability essential for wire drawing. Foundries rely on FeSi75 for inoculation of ductile and gray iron, controlling graphite morphology and preventing carbides. In electrical steel manufacturing, FeSi75 provides the precise silicon addition (typically 2-3%) needed to increase electrical resistivity and reduce core loss in transformer laminations. This combination of deoxidation efficiency, silicon addition capability, and inclusion engineering makes FeSi75 indispensable across multiple metallurgical sectors.

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