FeSi 72% and FeSi 75% – Applications, Selection, and Customization
FeSi 72% and FeSi 75%, also known as Ferro Silicon 72% and Ferro Silicon 75%, are essential ferroalloys widely used in steelmaking and foundry industries. With their high silicon content and low impurity levels, they play a critical role in improving steel quality, controlling chemical composition, and enhancing cast iron properties. In this article, we explore the main applications of FeSi 72% and FeSi 75%, how to choose the right grade for different steel types, and customization options for size and composition.
What Are the Main Applications of FeSi 72% and FeSi 75%?
Ferro Silicon 72% and 75% are primarily used as deoxidizers, alloying agents, and inoculants in steelmaking and foundry operations.
1. Steelmaking Applications
Deoxidation: Both FeSi 72% and FeSi 75% remove dissolved oxygen from molten steel. Silicon reacts with oxygen to form stable silicon oxides, which float to the slag, ensuring cleaner steel and reduced inclusions.
Alloying: Silicon is an essential alloying element in steel. Using FeSi 72% or 75% allows precise control over silicon content, improving strength, hardness, and wear resistance of steel.
Specialty Steel Production: FeSi 75%, with higher silicon content, is particularly suitable for alloy steels, stainless steels, and precision steels where strong deoxidation and exact chemical composition are required.
Carbon Steel and Mild Steel: FeSi 72% is commonly used for standard carbon steels where moderate deoxidation is sufficient and cost-efficiency is prioritized.
2. Foundry and Cast Iron Applications
Gray Iron: Both grades enhance graphite formation, reduce chill in castings, and improve machinability and surface finish.
Ductile Iron: FeSi 75% is often preferred because its higher silicon content promotes nodular graphite formation, resulting in better mechanical properties, higher tensile strength, and consistent elongation.
Alloy Cast Iron: Both FeSi 72% and 75% serve as alloying additives, stabilizing chemical composition and improving cast iron quality for industrial applications.
3. Other Industrial Uses
Electrical Steels: Small additions of FeSi 75% can enhance magnetic properties by controlling impurities.
Precision Castings: Silicon control is critical in high-precision foundry applications, where both FeSi 72% and FeSi 75% ensure consistent microstructure and mechanical performance.
How to Choose Between FeSi 72% and FeSi 75% for Different Steel Grades?
Selecting the appropriate ferro silicon grade depends on steel type, production process, and desired quality.
1. Deoxidation Requirements
For high-quality or alloy steels, FeSi 75% is recommended because it provides faster and stronger deoxidation, resulting in cleaner steel with lower inclusions.
For carbon steels or standard grades, FeSi 72% is sufficient and more cost-effective.
2. Silicon Content Precision
FeSi 75% allows precise silicon adjustment, which is critical for alloy steels, stainless steels, and tool steels.
FeSi 72% is adequate where slight variations in silicon content do not affect steel performance significantly.
3. Cost Considerations
FeSi 72% is generally lower in cost due to its lower silicon content.
FeSi 75%, although slightly higher in price, reduces material consumption per ton of steel because less alloy is needed for equivalent silicon contribution.
4. Process Compatibility
Electric Arc Furnace (EAF): Both grades can be used, but FeSi 75% enhances deoxidation efficiency and reduces slag volume.
Basic Oxygen Furnace (BOF): FeSi 75% is preferred for high-grade steel production.
Foundry Applications: Choose FeSi 75% for ductile iron and specialty cast iron, while FeSi 72% is suitable for standard cast iron.
Can FeSi 72% and FeSi 75% Be Customized in Size or Composition?
Yes, ZhenAn Ferro Silicon 72% and 75% can be customized to meet specific production requirements.
1. Particle Size Customization
Fine Powder: 1–3 mm for rapid dissolution in molten steel
Standard Lumps: 10–50 mm, suitable for EAF or BOF applications
Coarse Lumps: 50–100 mm, ideal for bulk steelmaking and foundry use
Custom particle sizing allows faster reaction rates, improved alloy recovery, and optimized steel or iron properties.
2. Chemical Composition Customization
Low Carbon FeSi 72% / 75% for high-quality steel
Low Aluminum FeSi 75% for specific foundry applications
Adjusted Silicon Content within standard limits (FeSi 72%: ~72%, FeSi 75%: ≥75%)
Impurity Control: Phosphorus (P), Sulfur (S), and other trace elements can be minimized per customer requirements
3. Packaging and Delivery Customization
Jumbo Bags: 1–1.25 MT per bag for bulk orders
Small Bags: 25 kg per bag, palletized for ease of handling
Special Export Packaging: Moisture-proof bags or customized bundles to protect FeSi 72% / 75% during international transport
ZhenAn ensures that each shipment of FeSi 72% and FeSi 75% is consistent in quality, size, and composition, meeting steelmakers' and foundries' exact specifications.
Why Choose ZhenAn FeSi 72% and FeSi 75%?
Consistent Silicon Content: ≥72% and ≥75%, ensuring predictable deoxidation and alloying performance
Low Impurities: Carbon, phosphorus, and sulfur controlled for cleaner steel and cast iron
Customizable Particle Size and Composition: Adapted to specific production and foundry needs
Global Export Experience: Safe packaging, HS code compliance, and Mill Test Certificates (MTCs) available
Technical Support: Guidance for steel and ductile iron applications, improving yield and product quality
Contact ZhenAn
For inquiries about FeSi 72% and FeSi 75% applications, grade selection, or customized solutions, contact ZhenAn. Our professional team provides technical advice, product specifications, and export-ready solutions to optimize your steelmaking and foundry operations.
Visit https://www.metal-alloy.com/ to learn more about the product. If you would like to learn more about the product price or are interested in purchasing, please email market@zanewmetal.com. We will get back to you as soon as we see your message.
🏭 Why Choose ZhenAn?
We understand the common pain points in current product procurement:
•High local cost and unstable supply
•Long lead times affecting project schedules
•Incomplete product ranges
•Slow communication and lack of follow-up
We Help Solve These Problems With:
✅ Large stock ready for fast delivery
✅ One-stop sourcing for Ferro Silicon, silicon metal, Silicon Metal Powder , and more
✅ Strict quality control with international standards
✅ Experienced sales team with fast response and clear communication
We'd love to learn more about your needs and offer you competitive prices and efficient service.
one-stop solution
professional team
high quality