4J50 , a soft magnetic alloy composed primarily of nickel and iron, is one of the most widely used materials in magnetic circuit components where stable permeability and low energy loss are critical. At DLX Alloy, we specialize in high-purity 4J50 wire production through advanced melting and drawing processes, ensuring consistent performance, uniform microstructure, and precise dimensional control.
Our 4J50 wire is engineered to deliver superior magnetic stability and efficiency, making it ideal for transformers, sensors, magnetic amplifiers, and shielding components in precision electronics.
For more details, pls directly contact us.
4J50 consists of approximately 50% nickel and 50% iron, creating an alloy with outstanding magnetic softness and a high level of initial permeability. It exhibits a low coercive force and stable magnetic performance even under alternating magnetic fields.
Key material features include:
-
High initial and maximum magnetic permeability
-
Low coercivity and hysteresis loss
-
Excellent thermal stability with a Curie temperature around 500°C
-
Good corrosion resistance under standard industrial environments
-
Consistent magnetic behavior over a wide temperature range
At DLX Alloy, we adopt vacuum melting and precision annealing to ensure purity and eliminate unwanted inclusions. The result is a wire that maintains stable performance under repeated magnetization cycles — essential for high-efficiency energy and signal systems.
Alloy Composition Table
|
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 |
- |
|
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 |
- |
|
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 |
- |
|
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 wire is used across multiple sectors where soft magnetic materials are needed for magnetic field conversion, transmission, and stabilization.
Typical applications include:
-
Magnetic circuit cores for transformers and inductors requiring stable permeability.
-
Precision sensors and amplifiers in instrumentation and aerospace systems.
-
Magnetic shielding in precision control equipment to minimize electromagnetic interference.
-
Relay cores and contactors that demand predictable magnetic switching behavior.
-
Transducer and magnetic switch components in industrial automation systems.
Because of its balance between cost, stability, and magnetic properties, 4J50 has become a core material in the modern magnetic components industry.
The global demand for soft magnetic materials like 4J50 continues to grow as industries move toward high-efficiency, low-power-loss designs. With the rapid evolution of renewable energy, electric vehicles, and data center systems, magnetic materials that can operate efficiently under changing magnetic fields are becoming increasingly valuable.
Manufacturers are also emphasizing miniaturization and energy optimization, which require materials with high permeability and predictable magnetization performance. DLX Alloy’s continuous innovation — including fine-grain heat treatment and precision rolling technology — aligns with this trend, delivering products with improved magnetic uniformity and long service life.
As new generations of magnetic sensors, power converters, and wireless systems emerge, materials like 4J50 will continue to play a crucial role in enhancing magnetic circuit efficiency and energy conversion precision.
| Property | 4J50 Alloy Wire | 4J42 Alloy Wire | 1J79 Alloy Wire |
|---|---|---|---|
| Nickel Content (%) | 49–51 | 41–43 | 78–80 |
| Magnetic Permeability (μ) | High | Moderate | Very High |
| Coercive Force (A/m) | ≤ 50 | ≤ 60 | ≤ 40 |
| Resistivity (μΩ·cm) | 40–50 | 45–50 | 60–70 |
| Curie Temperature (°C) | ~500 | ~360 | ~450 |
| Density (g/cm³) | 8.2 | 8.1 | 8.7 |
| Heat Resistance | Good | Moderate | Good |
| Typical Applications | Magnetic Circuits, Transformers | Sealing, Sensors | Shielding, Amplifiers |
From this comparison, 4J50 demonstrates an optimal balance between magnetic strength, heat resistance, and cost-effectiveness. It offers better thermal stability than 4J42 and higher permeability than most medium-nickel alloys, making it particularly suited for magnetic circuits operating under variable conditions.
Why DLX Alloy
At DLX Alloy, our strength lies in precision engineering and process consistency. We manufacture 4J50 wire with strict control over every production step — from vacuum melting to precision drawing — ensuring uniform grain structure and magnetic homogeneity.
Our core advantages include:
-
Advanced vacuum melting technology: eliminates gas inclusions and maintains uniform composition.
-
Precision annealing: ensures maximum permeability and minimal magnetic loss.
-
Dimensional accuracy: diameter tolerance within ±0.005mm for precise coil and component fabrication.
-
Custom performance tuning: tailored heat treatment options to achieve desired magnetic characteristics.
-
Reliable delivery and traceable quality: full testing data available for every production batch.
DLX Alloy provides technical consultation to help customers select the right alloy and optimize performance in real-world magnetic circuit designs. Our production integrates laboratory testing, microstructure analysis, and permeability evaluation, ensuring every spool of 4J50 wire performs exactly as intended.
DLX Production and Quality Assurance
We use state-of-the-art vacuum induction furnaces and precision wire drawing lines to produce consistent magnetic alloy wire. Each batch undergoes full magnetic and mechanical testing, including coercivity, permeability, and resistivity measurements.
Our quality control system ensures every production step meets strict industrial standards. In addition to standard wire forms, DLX can produce customized wire diameters and coil configurations to suit specific transformer, inductor, or sensor designs.
Every shipment is accompanied by detailed inspection reports, allowing customers to verify chemical composition, mechanical performance, and magnetic characteristics before use.
Sustainability and energy efficiency are at the forefront of material innovation. 4J50’s ability to reduce magnetic loss contributes directly to lower power consumption in electronic and energy systems. This makes it an environmentally responsible choice for modern magnetic circuit applications.
DLX Alloy continues to invest in green manufacturing practices, optimizing energy use and minimizing waste in production. Our goal is to provide magnetic alloys that not only meet performance demands but also align with the global push toward cleaner, more efficient technologies.
Looking ahead, with the expansion of electric mobility, automation, and smart energy systems, 4J50 will remain an essential soft magnetic material for high-precision components. DLX Alloy is dedicated to supplying the most reliable and high-performing versions of this alloy to help customers build the next generation of efficient, compact, and durable devices.
Conclusion
4J50 soft magnetic alloy wire is a cornerstone material for modern magnetic circuits. Its high permeability, low coercivity, and excellent thermal stability make it ideal for transformers, sensors, and magnetic shielding systems where precision and energy efficiency are critical.
Through decades of metallurgical expertise and process refinement, DLX Alloy delivers 4J50 wire that meets the highest standards of performance and consistency. Our production approach combines advanced equipment, strict testing, and customized engineering — ensuring our clients receive magnetic materials that truly elevate their products.
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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We support all kinds of testing:
1. What is 4J50 alloy wire mainly used for?
4J50 wire is mainly used for magnetic circuits, transformers, and inductors that require stable magnetic permeability and low energy loss.
2. How does 4J50 differ from 4J42?
4J50 has higher permeability and better thermal stability, making it more suitable for magnetic cores and circuits, while 4J42 is often used in sealing applications.
3. What is the typical operating temperature range of 4J50 wire?
It maintains stable performance up to around 450–500°C.
4. Does DLX Alloy offer custom diameters?
Yes, DLX provides a wide range of wire diameters and custom processing based on client requirements.
5. Can 4J50 wire be used in AC magnetic fields?
Yes, its low hysteresis loss and high permeability make it ideal for alternating magnetic fields.
6. What testing standards does DLX use for 4J50?
We follow ASTM and GB standards, including tests for coercivity, permeability, and chemical composition.
7. How is DLX 4J50 wire packed for export?
Wires are spooled, vacuum-sealed, and packaged with anti-corrosion materials for safe international transport.
8. Does 4J50 require special annealing treatment?
Yes, annealing at 1100–1150°C in a controlled atmosphere is recommended to restore magnetic softness after cold working.
