Permalloy 49 (4J49) Wire for Magnetic Cores and Shielding Devices

Permalloy 49 (4J49) Wire for Magnetic Cores and Shielding Devices

Brand Name:DLX Place of Origin:China Jiangsu Delivery Time:7-15 Days
Certification:CE,ROHS Supply Ability:500 tons per month
Payment Terms:L/C,T/T,Western Union,MoneyGram

Classification：

Soft Magnetic Alloy Wire

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Product Introduction

Permalloy 49, also known as 4J49, is one of the most recognized soft magnetic alloys, valued for its extremely high magnetic permeability and low coercivity. At DLX Alloy, we supply high-precision 4J49 wire designed for advanced electronic and magnetic systems where efficient magnetic performance and reliability are critical. This alloy is primarily used for magnetic cores, transformers, magnetic shielding, and precision instruments that require low magnetic loss and high sensitivity.

For more details, pls directly contact us.

4J49 is a nickel-iron alloy containing approximately 49% nickel and the balance iron. This precise composition provides excellent magnetic softness and stability over a wide range of frequencies. The wire can be processed into various forms, including fine wires, rods, and strips, depending on the application’s magnetic circuit design. Its ability to achieve high permeability under weak magnetic fields makes it especially useful in signal transmission systems, communication equipment, and aerospace magnetic components.

At DLX Alloy, our 4J49 wire is manufactured with tight dimensional tolerance and consistent magnetic properties. Using vacuum melting and controlled annealing technology, we ensure that the alloy retains its microstructural purity, which directly affects its magnetic sensitivity and performance longevity.

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	-
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.

Property	4J49 (Permalloy 49)	4J47	4J50
Nickel Content (%)	49	47	50
Density (g/cm³)	8.72	8.70	8.75
Curie Temperature (°C)	500	480	510
Max Permeability (μmax)	80,000–100,000	70,000–90,000	90,000–100,000
Coercive Force (A/m)	≤ 2.0	≤ 3.0	≤ 2.0
Electrical Resistivity (μΩ·m)	0.55	0.48	0.58
Saturation Flux Density (T)	0.75	0.78	0.72
Temperature Stability	Excellent	Good	Excellent

Compared with similar materials, 4J49 strikes a balance between magnetic permeability and mechanical stability. It performs well under low-frequency and static magnetic fields, maintaining reliable magnetic consistency even after prolonged operation.

Applications

Magnetic Shielding:
4J49 is widely used in shielding enclosures and chambers for protecting sensitive electronic devices from electromagnetic interference (EMI).
Magnetic Cores:
Ideal for cores in transformers, relays, sensors, and inductors, especially in audio and communication devices where precision and signal clarity are required.
Sensors and Transducers:
Used in fluxgate sensors and precision magnetometers due to its low hysteresis and high permeability.
Telecommunication Systems:
Supports stability in signal transmission lines and electromagnetic compatibility (EMC) applications.
Aerospace and Defense:
Selected for high-performance shielding systems in navigation and avionics equipment.
Medical Devices:
Applied in MRI shielding and sensor circuits that demand low magnetic noise.

Industry Trends

The demand for high-permeability alloys like 4J49 continues to grow, especially with the rapid advancement of 5G networks, precision medical instruments, and aerospace electronics. As devices become more compact and sensitive to interference, the need for effective magnetic shielding and low-loss materials has expanded significantly.

In the renewable energy and electric vehicle sectors, magnetic control components are also increasing in demand. Soft magnetic alloys such as 4J49 are becoming key materials in designing efficient power conversion systems, high-frequency inductors, and electric sensors.

At DLX Alloy, we see a rising global interest in energy-efficient materials with better electromagnetic compatibility (EMC) performance. This trend aligns perfectly with the role of 4J49, which provides stable magnetic properties under both DC and AC magnetic fields.

Why DLX Alloy

DLX Alloy offers competitive advantages in manufacturing, precision control, and technical expertise:

Advanced Production: Using vacuum induction melting and precision annealing ensures excellent magnetic uniformity.
Strict Quality Testing: Each batch undergoes permeability, coercive force, and resistivity testing to ensure consistent results.
Customization Support: We offer wire diameters from 0.02 mm up to 6.0 mm, with optional insulation and surface finishing.
High Purity Standards: Low inclusion levels and consistent chemical composition ensure stable magnetic properties.
Global Reach: Our 4J49 wires are exported to Europe, North America, and Asia, serving industries like electronics, aerospace, and defense.
Technical Assistance: DLX engineers support customers in material selection and performance optimization for specific magnetic circuit designs.

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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1. What makes 4J49 different from other nickel-iron alloys?
It offers an optimal balance of permeability, mechanical stability, and cost, performing well under low-frequency magnetic fields.

2. Can 4J49 wire be annealed after forming?
Yes. A hydrogen or vacuum anneal at 1100°C followed by controlled cooling enhances magnetic softness.

3. What is the maximum operating temperature for 4J49?
It operates effectively up to 450°C without significant loss of permeability.

4. Is 4J49 suitable for AC magnetic applications?
Yes, it maintains high permeability at low AC frequencies and is ideal for transformer cores.

5. How does DLX Alloy ensure dimensional accuracy?
We use high-precision drawing machines and automated diameter inspection to maintain tolerance within ±0.01 mm.

6. Can the wire be supplied with insulation coating?
Yes, optional coatings are available to improve winding efficiency and insulation.

7. What is the delivery form of DLX 4J49 wire?
We provide spools, coils, and custom-length cut pieces depending on application needs.

8. How does DLX control magnetic uniformity?
Through fine-grain heat treatment and strict metallurgical quality control to ensure consistent magnetic behavior throughout the batch.

Conclusion

Permalloy 49 (4J49) wire remains one of the most reliable materials for magnetic shielding and precision magnetic components. Its balance of high permeability, mechanical stability, and corrosion resistance makes it an ideal choice for demanding electronic systems. With the global shift toward miniaturized and high-performance devices, DLX Alloy continues to deliver 4J49 wires that meet strict magnetic and mechanical standards.

By maintaining advanced manufacturing technology and quality control, DLX provides not just material supply but also engineering partnership—helping clients improve product performance and magnetic efficiency in every application.