The 4J50 high permeability alloy plate is a key soft magnetic material widely used in magnetic circuits that require low core loss, high sensitivity, and precise magnetic response. At DLX Alloy, we have been manufacturing and optimizing 4J50 plates for years, combining real production experience with strict quality management to provide consistent performance in high-end transformer cores, magnetic shields, sensors, and aerospace magnetic control systems. Our 4J50 alloy is recognized by third-party testing organizations for its stable composition, magnetic reliability, and compliance with international standards.
4J50 is a nickel-iron soft magnetic alloy containing approximately 50% nickel and 50% iron. This specific ratio achieves the ideal balance between magnetic permeability and mechanical strength. It exhibits very high magnetic permeability, low coercive force, and minimal hysteresis loss, making it an excellent choice for magnetic circuits and precision electromagnetic components.
Core Material Properties:
-
Nickel content: 49–51%
-
High magnetic permeability (μmax ≥ 80,000) for efficient magnetic flux transmission
-
Low coercive force (Hc ≤ 8 A/m) ensuring minimal energy loss
-
Excellent magnetic uniformity and thermal stability
-
Good workability for machining, cutting, and forming
-
Stable after magnetic annealing—ideal for repeat-use industrial environments
At DLX Alloy, the material is melted under a vacuum environment and refined through multiple cold rolling and annealing stages to ensure uniform grain structure and minimal internal stress. This directly translates to more stable performance in actual application environments.
|
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 |
|
1J22 |
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 |
- |
|
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.
4J50 alloy plates are integral in the design of magnetic circuits, which rely on smooth and efficient magnetic flux transfer. These circuits are often found in systems that demand high precision and low magnetic losses. Common uses include:
-
Magnetic Circuit Cores: For transformers, inductors, and reactors in control systems and power electronics.
-
Magnetic Shielding Components: To minimize interference in sensitive devices such as sensors, instruments, and amplifiers.
-
Relays and Magnetic Amplifiers: For stable signal amplification with minimal magnetic drift.
-
Aerospace Magnetic Sensors: Where consistent permeability and temperature stability are critical.
-
Medical and Laboratory Equipment: Used in high-sensitivity magnetic field control and shielding.
In the growing sectors of electric vehicles, renewable energy, and 5G communications, precision magnetic circuits made from 4J50 materials are essential for efficiency and energy conservation.
Industry Trends
The global trend toward energy-efficient and miniaturized electronic systems has accelerated the use of high-performance soft magnetic materials. With the push toward smart manufacturing and intelligent control systems, the role of 4J50 alloy has expanded from traditional transformer cores to advanced micro magnetic circuits used in semiconductors and precision sensors.
At DLX Alloy, we’ve observed increasing demand from semiconductor packaging and power module manufacturers for magnetic materials that maintain stability under both high frequency and fluctuating temperatures. Our advanced hydrogen annealing process helps optimize the B-H curve and permeability, ensuring the magnetic circuit operates efficiently even in compact, high-density systems.
In addition, our products are tested and verified by independent agencies such as SGS and TUV, confirming compliance with ASTM A753 and GB/T 15002 standards, which enhances confidence for global OEM clients.
| Property | DLX 4J50 Alloy Plate | General Ni-Fe Alloy | Conventional Silicon Steel |
|---|---|---|---|
| Nickel Content (%) | 49–51 | 45–48 | — |
| Density (g/cm³) | 8.20 | 7.90 | 7.65 |
| Maximum Permeability (μmax) | ≥80,000 | ~60,000 | ~10,000 |
| Coercive Force (A/m) | ≤8 | ≤15 | ≤80 |
| Resistivity (μΩ·cm) | 45–55 | 35–40 | 45 |
| Curie Temperature (°C) | 500–550 | 450–500 | 740 |
| Thermal Expansion (×10⁻⁶/K) | 8.5–9.5 | 10–11 | 12–14 |
| Magnetic Loss (W/kg, 1.5T, 50Hz) | ≤0.8 | ≤1.2 | ≤2.0 |
| Recommended Annealing Temp (°C) | 1100–1200 | 1050–1150 | 800–900 |
This comparison highlights how DLX’s 4J50 plate outperforms traditional alloys, especially in terms of magnetic permeability, low coercive force, and reduced energy loss — all critical to the efficient design of modern magnetic circuits.
DLX Company Advantage
Our 4J50 production line incorporates vacuum induction melting, multi-stage precision rolling, and protective atmosphere annealing. Each process is optimized to reduce impurities and refine crystal orientation, ensuring that magnetic domains align uniformly for the highest magnetic response.
DLX’s in-house laboratory is equipped with B-H curve analyzers, eddy current detectors, and magnetic hysteresis testers. Each batch undergoes full inspection before shipment, ensuring the consistency and traceability of every plate.
We also collaborate with third-party testing institutions for additional verification, making our 4J50 products reliable for critical-use industries such as aerospace, medical equipment, and power electronics.
In addition, DLX provides customized dimensioning and precision cutting services, supporting clients who require tight tolerances for micro magnetic components. Our engineering team works directly with customers to fine-tune magnetic properties according to their circuit design needs.
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.
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FAQs:
1. What makes 4J50 suitable for magnetic circuit applications?
Its high magnetic permeability and low coercive force allow efficient magnetic flux transfer with minimal energy loss.
2. How does DLX ensure the purity and consistency of its 4J50 alloy?
We use vacuum induction melting and protective annealing processes to ensure uniformity and eliminate impurities that can affect magnetic behavior.
3. What kind of annealing process improves 4J50’s performance?
Hydrogen or vacuum annealing at 1100–1200°C optimizes magnetic domain alignment, increasing permeability and reducing residual stress.
4. Can 4J50 be used in high-frequency circuits?
Yes. After magnetic annealing, 4J50 maintains stable magnetic characteristics even under high-frequency or pulsed conditions.
5. What is the operating temperature range of 4J50?
It maintains stability below 500°C, with minimal magnetic property drift over repeated cycles.
6. Is DLX’s 4J50 compliant with international standards?
Yes, it meets ASTM A753 and GB/T 15002 standards, verified by SGS and other third-party institutions.
7. What sizes and thicknesses are available?
DLX offers thicknesses from 0.1 mm to 10 mm, with custom width and length based on client requirements.
8. Can DLX customize 4J50’s magnetic properties?
Yes. We can adjust the alloy’s permeability, coercivity, and stress relief parameters according to the customer’s circuit design specifications.
