The 4J50 soft magnetic alloy plate is a key material in the field of precision magnetics, widely used in transformers, inductors, magnetic shields, and other core components that demand excellent magnetic performance and dimensional stability. At DLX Alloy, we specialize in producing high-quality 4J50 alloy plates that meet the stringent requirements of the electronics, power, and aerospace industries. Drawing from years of production experience and third-party validation, we focus on providing material solutions that ensure long-term performance reliability and process consistency.
4J50 is a nickel-iron soft magnetic alloy containing approximately 50% nickel and 50% iron, designed for high magnetic permeability and low coercive force. This alloy features excellent magnetic uniformity, low magnetostriction, and good corrosion resistance. It performs stably under various thermal and magnetic conditions, making it suitable for high-frequency transformers, precision relays, and magnetic shields.
Key Characteristics:
-
High Initial and Maximum Permeability: Ensures sensitive magnetic response.
-
Low Coercive Force: Reduces magnetic energy loss during operation.
-
Stable Magnetic Properties After Annealing: Guarantees consistent magnetic performance in batch production.
-
Good Workability: Suitable for precision machining, stamping, and rolling.
-
Controlled Thermal Expansion: Maintains stable dimensions under fluctuating temperatures.
|
Alloy Grades |
C |
S |
P |
Mn |
Si |
Ni |
Cr |
Co |
Mo |
Cu |
Al |
Nb |
Fe |
Other Elements |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
1J06 |
0.04 |
0.015 |
0.015 |
≤0.10 |
≤0.15 |
- |
- |
- |
- |
- |
5.5-6.5 |
- |
Rest |
- |
|
1J12 |
0.03 |
0.015 |
0.015 |
≤0.10 |
≤0.15 |
- |
- |
- |
- |
- |
11.6-12.4 |
- |
Rest |
- |
|
1J17 |
0.03 |
0.02 |
0.02 |
≤0.60 |
≤0.20 |
- |
15.5-16.5 |
- |
- |
- |
- |
- |
Rest |
- |
|
1J18 |
0.03 |
0.02 |
0.02 |
0.3-0.7 |
≤0.15 |
0.5-0.7 |
17-18.5 |
- |
- |
- |
- |
- |
Rest |
Ti: 0.3-0.7 |
|
0.04 |
0.02 |
0.02 |
≤0.3 |
≤0.3 |
≤0.5 |
- |
49-51 |
- |
≤0.2 |
- |
- |
Rest |
V: 0.8-1.8 |
|
|
1J30 |
0.04 |
0.02 |
0.02 |
≤0.40 |
≤0.30 |
29.5-30.5 |
- |
- |
- |
- |
- |
- |
Rest |
- |
|
1J36 |
0.03 |
0.02 |
0.02 |
≤0.60 |
≤0.20 |
35.0-37.0 |
- |
- |
- |
- |
- |
- |
Rest |
- |
|
1J38 |
0.03 |
0.05 |
0.02 |
0.3-0.6 |
0.15-0.3 |
37.5-38.5 |
12.5-13.5 |
- |
- |
- |
- |
- |
Rest |
- |
|
1J46 |
0.03 |
0.02 |
0.02 |
0.6-1.1 |
0.15-0.3 |
45.0-46.5 |
- |
- |
- |
≤0.2 |
- |
- |
Rest |
- |
|
1J50 |
0.03 |
0.02 |
0.02 |
0.3-0.6 |
0.15-0.3 |
49-50.5 |
- |
- |
- |
≤0.2 |
- |
- |
Rest |
- |
|
1J51 |
0.03 |
0.02 |
0.02 |
0.3-0.6 |
0.15-0.3 |
49-50.5 |
- |
- |
- |
≤0.2 |
- |
- |
Rest |
- |
|
1J54 |
0.03 |
0.02 |
0.02 |
0.3-0.6 |
1.1-1.4 |
49.5-51 |
3.8-4.2 |
- |
- |
≤0.2 |
- |
- |
Rest |
- |
|
1J76 |
0.03 |
0.02 |
0.02 |
0.3-0.6 |
0.15-0.3 |
75.0-76.5 |
1.8-2.2 |
- |
- |
4.8-5.2 |
- |
- |
Rest |
- |
|
1J77 |
0.03 |
0.02 |
0.02 |
0.3-0.6 |
0.15-0.3 |
75.5-78 |
- |
- |
3.9-4.5 |
4.8-6.0 |
- |
- |
Rest |
- |
|
1J79 |
0.03 |
0.02 |
0.02 |
0.6-1.10 |
0.3-0.5 |
78.5-80.0 |
- |
- |
3.8-4.1 |
≤0.2 |
- |
- |
Rest |
- |
|
1J80 |
0.03 |
0.02 |
0.02 |
0.6-1.10 |
1.1-1.5 |
79.0-81.5 |
2.6-3.0 |
- |
- |
≤0.2 |
- |
- |
Rest |
- |
|
1J85 |
0.03 |
0.02 |
0.02 |
0.3-0.60 |
0.15-0.3 |
79.0-81.0 |
- |
- |
4.8-5.2 |
≤0.2 |
- |
- |
Rest |
- |
|
1J87 |
0.03 |
0.02 |
0.02 |
0.3-0.6 |
≤0.3 |
78.5-80.5 |
- |
- |
1.6-2.2 |
- |
- |
6.5-7.5 |
Rest |
- |
For more details, pls directly contact us.
The 4J50 soft magnetic alloy plate is primarily used in devices requiring high magnetic sensitivity and low loss performance. It has extensive applications across industrial, electrical, and scientific fields:
-
Transformer and Inductor Cores: Provides efficient magnetic coupling and energy conversion with minimal losses.
-
Magnetic Shielding Components: Reduces external magnetic interference in precision instruments and sensors.
-
Relay and Magnetic Amplifier Cores: Enhances sensitivity and stability in low-current control systems.
-
Aerospace Systems: Used in magnetic sensors and navigation systems due to high reliability.
-
Medical Devices: Applied in magnetic isolation and shielding for sensitive diagnostic equipment.
Industry Trends
The demand for high-efficiency, miniaturized power systems continues to rise, especially in semiconductor equipment, EV charging systems, and 5G communication devices. This shift has led to increased usage of advanced soft magnetic materials like 4J50 that offer superior magnetic response and stability under high-frequency conditions.
Another trend is the growing focus on precision-controlled manufacturing, where uniformity in composition and magnetic performance is crucial. DLX Alloy has responded by enhancing its vacuum melting and fine rolling processes, ensuring every 4J50 plate meets tight tolerance standards.
In addition, third-party material verification institutions such as SGS and TUV have provided consistent validation for DLX Alloy’s 4J50 series, confirming its conformity with international standards including ASTM and GB/T protocols.
Technical Comparison Table
| Property | 4J50 Alloy Plate (DLX Standard) | Typical Iron-Nickel Alloy | Silicon Steel Sheet |
|---|---|---|---|
| Nickel Content (%) | 49–51 | 45–48 | — |
| Density (g/cm³) | 8.20 | 7.90 | 7.65 |
| Curie Temperature (°C) | 500–550 | 450–500 | 740 |
| Maximum Permeability (μmax) | ≥80,000 | ~60,000 | ~10,000 |
| Coercive Force (A/m) | ≤8 | ≤15 | ≤80 |
| Resistivity (μΩ·cm) | 45–55 | 35–40 | 45 |
| Thermal Expansion (×10⁻⁶/K) | 8.5–9.5 | 10–11 | 12–14 |
| Recommended Annealing Temp (°C) | 1100–1200 | 1050–1150 | 800–900 |
| Magnetic Stability | Excellent | Good | Moderate |
DLX Company Advantage
DLX Alloy’s 4J50 production integrates advanced melting and precision rolling technology, supported by vacuum induction furnaces and hydrogen annealing systems. This ensures stable alloy composition and optimized magnetic domain structure.
Our in-house laboratory conducts B-H curve analysis, eddy current testing, and dimensional precision control to verify every production batch. Moreover, all DLX 4J50 plates undergo magnetic annealing in a protective atmosphere, reducing residual stress and ensuring top-level performance consistency.
Beyond production, we offer customized cutting, polishing, and packaging to fit specific component dimensions—especially important for clients manufacturing micro-transformers or miniature inductors.
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.
For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
Client Visits
Building Stronger Partnerships
We support all kinds of testing:
FAQs:
1. What is the main advantage of 4J50 compared to other magnetic alloys?
It offers a balanced combination of high permeability, low coercivity, and excellent mechanical stability, making it ideal for precision magnetic cores.
2. Can 4J50 operate under high temperatures?
Yes, it maintains magnetic stability up to around 500°C, though prolonged exposure above this may require re-annealing.
3. How does DLX ensure batch consistency?
Through vacuum melting, magnetic domain testing, and third-party certification to guarantee repeatable results.
4. Is 4J50 suitable for high-frequency applications?
Yes, especially after magnetic annealing, it performs well in medium to high-frequency transformers and sensors.
5. Can 4J50 be machined easily?
It can be machined, rolled, or stamped after cold processing, though final annealing is recommended to restore its magnetic performance.
6. How does 4J50 perform compared to silicon steel?
It offers much higher permeability and lower coercive force, though it is more costly—ideal for precision or high-sensitivity components.
7. What thicknesses does DLX offer for 4J50 plates?
From 0.1 mm to 10 mm, depending on customer requirements and application type.
8. How does DLX guarantee international compliance?
All products are tested according to ASTM A753 and GB/T 15002 standards, with full SGS verification for export certification.
