1J50 Soft Magnetic Alloy
Introduction to 1J50 Alloy (Ni50, Hy-Ra49, PB)
1J50, also known as Ni50, E11a, 50H, Hy-Ra49, or PB, is a nickel-iron (Ni-Fe) soft magnetic alloy containing approximately 50% nickel, 48% iron, and trace elements. This material is renowned for its high magnetic permeability and superior saturation induction density, making it indispensable for electromagnetic applications in power systems, telecommunications, and precision instrumentation.
Key Characteristics of 1J50 Alloy
High saturation induction (Bs ≈ 1.5 T) – Ideal for medium to high magnetic field applications
Excellent magnetic permeability (μ) – Enhances energy efficiency in transformers and inductors
Low coercivity (Hc) – Reduces hysteresis losses in alternating magnetic fields
Good mechanical workability – Can be rolled into thin sheets for high-frequency applications
Chemical Composition
| % | C≤ | P≤ | S≤ | Mn | Si | Ni | Cu | Fe |
|---|---|---|---|---|---|---|---|---|
| 1J50 | 0.03 | 0.02 | 0.02 | O．30～ 0.60 | O．15～ 0.30 | 49.0～ 50.5 | ≤O．20 | balance |
Physical Properties
| Density (g/cm3) | Resistivity under 20℃(Ωmm2/m) | Linear expansion coefficient (20℃-200℃) X10-6/℃ | Saturation magnetostrictive coefficient, λθ/ 10-6 | Curie point, Tc/ ℃ |
|---|---|---|---|---|
| 8.2 | 0.45 | 9.2 | 25 | 500 |
Mechanical Properties (Minimum value at 20℃)
| Yield strength | Tensile Strength | Elongation |
|---|---|---|
| Mpa | Mpa | % |
| 685 | 780 | 3~35 |
Magnetic property
| 1J50 | Initial magnetic permeability | Max.magnetic permeability | Coercive force | Saturation induction intensity |
|---|---|---|---|---|
| Cold rolled strip/sheet material thickness, mm | μ0.08/ (mH/m) | μm/ (mH/m) | Hc/ (A/m) | Bs/T |
| 0.05 mm | ≥2.5 | ≥35 | ≤20 | 1.5 |
| 0.1~0.19 mm | ≥3.8 | ≥43.8 | ≤12 | 1.5 |
| 0.2~0.34 mm | ≥4.4 | ≥56.3 | ≤10.4 | 1.5 |
| 0.35~1.0 mm | ≥5 | ≥65 | ≤8.8 | 1.5 |
| 1.1~2.5 mm | ≥3.8 | ≥44 | ≤12 | 1.5 |
| Bar | - | - | - | - |
| 8-100 mm | ≥3.1 | ≥25 | ≤24 | 1.5 |
Heat treatment
In-Process Annealing: To remove all strain and restore the alloy to a soft state suitable for further cold rolling or drawing, forming, bending or similar operations, anneal at 1020-1080°C for no more than 1 hour. In-process annealing should be performed in dissociated ammonia, hydrogen, vacuum or inert gas atmosphere.
Final Annealing: For maximum softness and the best magnetoelectric properties, cold deformed 1J50 alloy should be annealed in an oxygen-free, dry hydrogen atmosphere at 1180°C with a dew point below -40°C for 3-5 hours.
Oil, grease, paint and all other contaminants must be removed prior to annealing. During hydrogen annealing, individual parts should be separated by inert insulating powders such as magnesia and alumina.
Vacuum heat treatment can be used, but it usually results in a sacrifice of magnetic properties compared to heat treatment in a dry hydrogen atmosphere.
Comparison with Other Soft Magnetic Alloys
| Alloy | Ni Content (%) | Key Advantage | Primary Applications |
|---|---|---|---|
| 1J50 (Ni50) | 50 | High Bs, balanced permeability | Transformers, motors, relays |
| 1J79 (Permalloy) | 79 | Ultra-high permeability | Sensors, magnetic shielding |
| 1J22 (Hiperco 50) | 50 + Co | Highest Bs (2.4 T) | Aerospace, high-power electromagnets |
Industrial Applications of 1J50 Alloy
1. Power Electronics & Energy Systems
Transformer cores (medium-frequency operations)
Inductors & choke coils (switching power supplies)
2. Telecommunications & Sensors
Magnetic shielding for sensitive equipment
High-frequency inductors in RF circuits
3. Automotive & Aerospace
Electric vehicle (EV) motor components
Avionics systems requiring lightweight magnetic solutions
Lork Group is a leading global supplier of 1J50 Soft Magnetic Alloy (also known as Ni50, Hy-Ra49, or PB), specializing in high-permeability nickel-iron alloys for critical electromagnetic applications.
Our 1J50 Alloy Product Range
- 1J50 Thin Laminations (0.1mm–0.5mm thickness)
- Insulated Sheets (MgO or oxide coating for eddy current reduction)
- Custom Annealed Blanks (Vacuum heat-treated for optimal magnetic properties)
- Precision-Stamped Cores (E/I cores, toroids for transformers & inductors)
Contact Our Alloy Specialists Today!
For pricing, technical specs, or custom requirements:
Email: susan@lorkgroup.com
WhatsApp: +8619937075488
Visit: https://www.lorkalloy.com/products
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