Iron-based
Iron-based powder is a raw material of alloy powder with iron as the main component, which is widely used in the fields of mechanical parts, 3C products, porous materials, tooling materials, magnetic materials, shielding materials, surface coatings, etc., and it is the raw material of powder metallurgy with a large dosage, and it has a high cost performance ratio.
FeSi iron-silicon soft magnetic alloy powder · Iron-silicon alloy powder
High magnetic flux density · Low loss · Specifically for powdered‑iron cores and monolithic inductors FeSi3.5 ~ FeSi6.5 · -150 mesh to -500 mesh
Process Advantages
High magnetic induction · High saturation
It exhibits a high saturation magnetic flux density and a high magnetic energy density, while maintaining a relatively high effective permeability even under high-current conditions, and demonstrates excellent DC bias characteristics.
High resistivity · Low eddy current loss
Silicon significantly increases the alloy’s electrical resistivity, far exceeding that of pure iron, thereby effectively suppressing high-frequency eddy current losses and making it suitable for high-frequency operating conditions.
Near-zero magnetostriction
FeSi6.5 exhibits near-zero magnetostriction, resulting in extremely low operating noise, making it particularly well suited for high-frequency inductors and audio equipment that are sensitive to noise.
High sphericity · Process compatibility
Non‑vacuum atomized spherical powder with excellent sphericity and appropriate tapped density, suitable for processes such as magnetic powder core pressing, monolithic inductor manufacturing, and MIM.
Product Real-Scene Photos & Microscopic Morphology
SEM of gas-atomized FeSi6.5 powder
High sphericity, uniform particle size distribution, and excellent flowability.
Real-life photos of the powder
Gray powder, packaged in vacuum-aluminum foil bags or iron drums.
Magnetic Powder Cores / Molded Inductors
PFC inductor cores, molded inductors, magnetic shielding materials
FeSi iron-silicon soft magnetic alloy powder
FeSi alloy is one of the most widely used soft magnetic materials. Silicon forms a solid solution in the iron matrix, significantly increasing the alloy’s electrical resistivity, reducing hysteresis losses, and enhancing its oxidation and corrosion resistance. This alloy exhibits high saturation magnetic induction, low core losses, excellent DC bias characteristics, and good thermal stability. TIJO employs a non‑vacuum gas atomization process to produce spherical FeSi powders with superior sphericity, excellent flowability, and a controllable particle size distribution. The product line includes four standard grades—FeSi3.5, FeSi4.5, FeSi5.5, and FeSi6.5—covering silicon contents from 3.2% to 6.8%, with the option to customize any silicon level within the 3.0%–7.0% range to meet customer requirements. Particle sizes span from -150 mesh to -500 mesh, making them suitable for applications such as magnetic powder core compaction, integrated‑molded inductors, MIM, and powder metallurgy processes.
Grade series
| Grade | Silicon content (%) | Feature Positioning |
|---|---|---|
| FeSi3.5 | 3.2-3.8 | Excellent overall performance, high magnetic permeability, and low cost. |
| FeSi4.5 | 4.2-4.8 | Resistivity increases, while mid- and high-frequency losses decrease. |
| FeSi5.5 | 5.2-5.8 | Low high-frequency loss and excellent temperature stability. |
| FeSi6.5 | 6.2-6.8 | Highest resistivity, near-zero magnetostriction, and optimal high-frequency performance. |
Chemical Composition (wt%)
| Grade | Fe | Yes | C ≤ | S ≤ | P ≤ |
|---|---|---|---|---|---|
| FeSi3.5 | Bal. | 3.2-3.8 | 0.03 | 0.01 | 0.02 |
| FeSi4.5 | Bal. | 4.2-4.8 | 0.03 | 0.01 | 0.02 |
| FeSi5.5 | Bal. | 5.2-5.8 | 0.03 | 0.01 | 0.02 |
| FeSi6.5 | Bal. | 6.2-6.8 | 0.03 | 0.01 | 0.02 |
* Impurity levels are strictly maintained at extremely low levels to ensure that magnetic properties are not degraded by non‑magnetic inclusions. The specific composition shall be subject to the batch inspection report.
Physical Properties & Grade Selection
| Grade | Resistivity (μΩ·cm) | Saturated magnetic flux density (T) | Curie temperature (°C) | Density (g/cm³) | Magnetostriction | Typical Applications |
|---|---|---|---|---|---|---|
| FeSi3.5 | ≈52 | ≈1.8 | ≈730 | 7.60 | Lower | General-purpose magnetic powder cores, motor cores, transformers |
| FeSi4.5 | ≈60 | ≈1.7 | ≈720 | 7.55 | Low | Medium- and high-frequency inductors, chokes, PFC circuits |
| FeSi5.5 | ≈70 | ≈1.65 | ≈710 | 7.50 | Very low | High-frequency transformers, switching power supplies, and new-energy inverters |
| FeSi6.5 | ≈82 | ≈1.6 | ≈700 | 7.45 | Near-zero | High-frequency, high-current inductors, magnetic shielding, high-end magnetic powder cores |
* The above values are reference figures for the dense state; the properties of powdered products vary depending on the forming process and heat‑treatment conditions. Please refer to the Certificate of Analysis (COA) for each batch.
Particle Size Specifications & Selection Guide
| Particle size specification | Corresponding mesh count | Recommended Process | Typical Applications |
|---|---|---|---|
| -150 mesh | ≤100μm | Magnetic powder core pressing, powder metallurgy | Large magnetic powder cores, high-current inductors, transformer cores |
| -200 mesh | ≤74μm | Magnetic powder core pressing, integrated molded inductor | General-purpose specifications, suitable for the production of most magnetic powder cores. |
| -300 mesh | ≤48μm | Fine magnetic powder cores, MIM | High-frequency magnetic powder cores, small integrated molded inductors |
| -500 mesh | ≤25μm | Ultrafine powder technology, high-frequency magnetic powder cores | Ultra-high-frequency devices, miniature inductors, and microwave-absorbing materials |
* For pressed magnetic powder cores, a mesh size of -150 to -300 is recommended; for integrally molded inductors, a mesh size of -200 to -300 is recommended. Customized products with particle size distributions ranging from 10 to 200 μm are available.
Typical application areas
Magnetic powder core
Iron-silicon magnetic powder cores and PFC inductor cores, featuring high saturation flux density and excellent DC bias characteristics.
Integrated molded inductor
Molded inductors, chokes, and power inductors—high sphericity ensures compaction density.
Switching power supply
PFC circuits, inverters, and AC/DC converters—high-frequency with low losses and excellent temperature stability.
New energy vehicles
On-board charger (OBC), DC-DC converter, and charging station—stable operation under high-frequency, high-current conditions.
Electromagnetic shielding
Magnetic shielding materials, EMI suppression, and high-permeability absorption of stray magnetic fields.
Wave-absorbing material
Radar-absorbing coatings and EMC materials achieve frequency-specific absorption by tailoring their composition and particle size.
New energy
Solar inverters, wind power converters, and energy storage systems exhibit excellent high-temperature stability.
UPS power supply
UPS inductors and filters, with excellent DC bias characteristics and low losses.
Process Recommendations and Parameters
| Craftsmanship | Recommended particle size | Key parameters |
|---|---|---|
| Magnetic powder core pressing | -150 mesh / -200 mesh | Pressing pressure: 800–1400 MPa, combined with insulating coating treatment. |
| Integrated molded inductor | -200 mesh / -300 mesh | Molding temperature: 150–250°C; pressure: 100–300 MPa. |
| MIM injection molding | -300 mesh / -500 mesh | Catalytic degreasing + sintering at 1100–1200°C |
| Heat treatment annealing | — | 700–850°C, hydrogen/vacuum, to relieve internal stresses |
* During the pressing of magnetic powder cores, it is recommended to apply an insulating coating to further increase resistivity and reduce eddy current losses.
Quick Selection Guide
| Frequency range | Recommended grade | Explanation |
|---|---|---|
| <50 kHz | FeSi3.5 | High magnetic induction, general-purpose type |
| 50-100kHz | FeSi4.5 / FeSi5.5 | Medium-frequency low loss |
| ≥100kHz | FeSi6.5 | Highest resistivity, near-zero magnetostriction, and optimal at high frequencies. |
| Insulation coating | — | Further increase the resistivity and reduce eddy current losses. |
* FeSi6.5 has a resistivity far higher than that of conventional silicon steel, making it an ideal choice for high-frequency applications above 100 kHz.
End-to-end testing capability
Each batch of FeSi powder is analyzed for major elements (Fe, Si), impurities (C, S, P), particle size distribution, oxygen content, flowability, and tapped/loose bulk density. Additionally, the magnetic properties of pressed magnetic powder cores are periodically sampled and tested. We provide Certificate of Analysis (COA) reports and insulation coating services.
Packaging & Delivery
Powder packaging
Vacuum-sealed in a double-layer aluminum foil pouch (to prevent oxidation), with an outer iron or plastic drum.
Specifications: 1 kg, 5 kg, 10 kg, 25 kg, 50 kg per drum
Export packaging
Export orders are packed in wooden crates or palletized and reinforced to protect against moisture and impact.
Compatible with sea freight, air freight, and international express delivery.
Delivery time
Standard particle size in stock; ships within 5–7 days after order confirmation.
Custom particle size or minor formulation adjustments: 7–15 days
Batch Traceability
For each batch, a sample is retained, and the COA report is shipped with the goods.
Supports third-party testing (e.g., SGS)
Free sample
Free samples are provided for process validation.
Small-batch samples; bulk supply upon quality confirmation.
Customized Services
Customized silicon content (3.0–7.0%), customized particle size, and insulating coating treatment
Meets special operating conditions and equipment requirements
Shipping documents
COA, MSDS, ingredient list, packing list
Meets export customs clearance requirements and customer in-plant inspection standards.
Technical Support
Providing guidance on core‑forming and heat‑treatment process parameters.
Assist in resolving issues encountered during use.
Inquire Now for Free Samples
Fill out the form on the right or contact us directly; we will provide product samples, technical data sheets, and price quotes to help you quickly complete your additive manufacturing process validation.
Address: No.39, Liandong Yougu lnd. Park, Bachelor Street,Changsha City,Hunan Province, China.
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Address: No.39, Liandong Yougu lnd. Park, Bachelor Street,Changsha City,Hunan Province, China.
