Soft Magnetic Alloys
High Permeability · Low Core Loss · 1J50 / 1J79 / 1J85 · Strip, Wire, Bar
High-Performance Soft Magnetic Alloys Solutions
Executive standards: GB/T 14986-2008, GB/T 32286.1-2015, etc.
Soft magnetic alloys are magnetic alloys that are readily magnetized under an external field and essentially lose their magnetic induction once the field is removed. The term "soft" refers to how easily these materials magnetize. The family includes low-carbon electrical steel and Armco iron, silicon steel, nickel-iron soft magnetic alloys, iron-cobalt soft magnetic alloys and sendust (Fe-Si-Al) alloys.
Thanks to their ease of magnetization and demagnetization and their very high permeability, soft magnetic alloys concentrate magnetic flux lines effectively and are therefore widely used as flux-carrying, magnetically conductive materials.
Why Choose Kunsen Soft Magnetic Alloys
Extreme Performance, Customized Beyond
No matter how demanding your application is, we deliver alloy solutions that far exceed national standards and meet extreme requirements.
Expert Support, Precise Selection
Our technical team provides material selection advice and engineering support to ensure optimal performance in your application.
Indispensable Applications
Electromagnetic Cores
Cores and yokes for transformers, instrument transformers and magnetic amplifiers.
Magnetic Shielding
Shielding enclosures for precision instruments and extremely-weak magnetic field environments.
Sensors & Relays
Automotive sensors, relays, electromagnetic clutches and special magnetic circuit components.
Specifications & Grades
Chemical Composition(%)
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 1J50 | 0.010 | 0.17 | 0.35 | 0.006 | 0.005 | 49.80 | 0.02 | / | Bal. |
| 1J79 | 0.010 | 0.38 | 0.85 | 0.005 | 0.003 | 79.50 | 0.02 | 3.95 | Bal. |
| 1J85 | 0.010 | 0.18 | 0.35 | 0.005 | 0.003 | 80.30 | 0.02 | 4.95 | Bal. |
Physical Properties
| Grade | Density (g/cm³) | Thermal Expansion (10⁻⁶/°C) | Curie Point (°C) | Resistivity (μΩ·cm) | Thermal Conductivity (W/m·°C) |
|---|---|---|---|---|---|
| 1J50 | 8.2 | 8.2 (20–100°C) | 498 | 45 (20°C) | 16.5 |
| 1J79 | 8.6 | 11.0 (20–100°C) | 450 | 55 (20°C) | 13.4 |
| 1J85 | 8.75 | 12.4 (20–100°C) | 450 | 56 (20°C) | 18.7 |
Magnetic Properties
| Grade | Initial Permeability μ₀ (mH/m) | Max. Permeability μm (mH/m) | Coercive Force Hc (A/m) | Saturation Flux Density Bs (T) |
|---|---|---|---|---|
| 1J50 | ≥8.0 | ≥50 | ≤50 | ≤10 |
| 1J79 | ≥40 | ≥310 | ≤2.0 | ≤2.0 |
| 1J85 | ≥60 | ≥280 | ≤2.0 | ≤2.0 |
Need Soft Magnetic Alloys selection advice or a quote?
Our technical team provides material selection advice and engineering support to ensure optimal performance in your application.