The 4J49 Permalloy plate is a nickel–iron soft magnetic alloy known for its extremely high magnetic permeability, low coercivity, and excellent magnetic shielding performance. At DLX Alloy, we have been working with precision magnetic materials like 4J49 for over a decade, supplying custom-engineered plates and strips for demanding industries such as electronics, telecommunications, instrumentation, aerospace, and precision sensors. Through hands-on experience in both production and field application, we’ve developed a deep understanding of how to help customers achieve stable and reliable magnetic performance in real-world systems.
4J49 Permalloy, also known as Ni49Fe alloy, typically contains about 49% nickel and the balance iron with trace elements that enhance magnetic uniformity. After proper heat treatment and magnetic annealing, it can achieve a maximum magnetic permeability of over 100,000 under low magnetic field strength. This makes it a preferred choice for applications where efficient magnetic flux conduction and minimal energy loss are critical.
At DLX, our factory uses precision vacuum melting and cold rolling technology to ensure uniform composition, low impurity levels, and smooth surface finish. The annealing process is conducted under controlled hydrogen or vacuum conditions to ensure maximum permeability and consistent magnetic properties across the plate.
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 |
- |
|
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.
4J49 Permalloy plates are widely used in:
-
Magnetic cores for transformers, sensors, and transducers
-
Magnetic shielding devices in precision instruments, such as oscilloscopes, MRI systems, and communication equipment
-
Electromagnetic interference (EMI) shielding for data storage and control systems
-
Aerospace and defense components where precise magnetic control is required
-
Energy and power electronics to minimize stray magnetic fields in converters and inverters
Our clients often come to us with specific challenges—such as unstable magnetic flux or excessive noise interference. Through controlled annealing and tight dimensional tolerances, our 4J49 plates have successfully resolved these issues in both small-scale laboratory instruments and high-volume industrial applications.
Industry Analysis
With the growth of electric vehicles, 5G communications, and advanced sensing technology, the demand for high-performance magnetic shielding materials is rapidly increasing. Soft magnetic alloys like 4J49 are becoming more critical as electronic systems become smaller, faster, and more sensitive.
The global market trend shows a steady rise in the use of nickel–iron Permalloys in precision fields because they provide reliable magnetic performance while maintaining mechanical stability. DLX has positioned itself at the forefront of this development by expanding production capacity and offering tailored magnetic material solutions that align with these emerging technologies.
Furthermore, DLX’s R&D team works closely with third-party testing institutions such as SGS and ISO-certified labs to verify product performance, ensuring that each batch meets international standards for permeability, hardness, and corrosion resistance.
| Property | 4J49 Permalloy Plate | 1J85 High-Nickel Alloy | Pure Iron Magnetic Plate |
|---|---|---|---|
| Nickel Content (%) | 49 | 80 | <0.1 |
| Density (g/cm³) | 8.65 | 8.70 | 7.87 |
| Maximum Permeability (μmax) | 100,000+ | 120,000 | 5,000 |
| Coercive Force (A/m) | ≤4 | ≤2 | ≥10 |
| Saturation Induction (T) | 1.55 | 0.8 | 2.15 |
| Resistivity (μΩ·cm) | 55 | 50 | 10 |
| Annealing Temperature (°C) | 1100 | 1150 | 900 |
| Magnetic Shielding Effectiveness | Excellent | Excellent | Medium |
| Processing Difficulty | Moderate | High | Low |
While 1J85 offers slightly higher permeability, 4J49 strikes the ideal balance between magnetic sensitivity, mechanical strength, and cost-effectiveness—making it the most versatile choice for industrial applications. DLX’s in-house rolling and annealing control ensures that our 4J49 plates maintain magnetic consistency even under complex electromagnetic conditions.
Why Choose DLX
-
Full Control of Production Chain – From vacuum melting to precision rolling and magnetic annealing, all steps are conducted in-house to guarantee stable magnetic characteristics and minimal impurity content.
-
Proven Engineering Experience – DLX has supplied 4J49 materials for over 60+ international clients across the electronics and instrumentation sectors, earning repeat cooperation due to material stability.
-
Custom Processing Capability – We offer tailored thicknesses (0.05mm–3mm), flatness control, and laser-cut plate sizes to fit any device or shielding design.
-
Third-Party Verified Quality – SGS and ISO testing certificates available upon request, ensuring authenticity and compliance with export standards.
-
Application Support – Our engineers provide magnetic simulation and design optimization guidance to help customers maximize efficiency.
-
Export Experience – DLX’s materials are shipped to Europe, North America, and Southeast Asia with full export documentation and REACH/RoHS compliance.
Through real-world applications—from transformer core lamination to MRI shielding structures—our clients have experienced measurable improvements in energy efficiency and signal stability. This practical performance evidence gives DLX’s 4J49 plates strong credibility in professional markets.
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:
FAQs:
1. What’s the typical permeability of DLX 4J49 Permalloy plates?
After magnetic annealing, μmax can exceed 100,000 under low magnetic field intensity.
2. Can DLX customize plate thickness and size?
Yes, we offer custom cutting and rolling, from 0.05mm thin sheets to 3mm plates, based on customer drawings.
3. What’s the recommended heat treatment process?
A full anneal at 1100°C in hydrogen or vacuum, followed by controlled cooling, to restore optimal magnetic properties.
4. How does 4J49 differ from high-nickel Permalloy like 1J85?
4J49 has higher saturation induction, making it more suitable for higher magnetic flux densities and cost-sensitive applications.
5. Is the surface finish important for magnetic performance?
Yes. Surface defects can cause magnetic leakage; our precision polishing minimizes that issue.
6. Can DLX provide test reports?
Absolutely. We can include SGS or third-party lab reports verifying permeability and composition upon request.
7. What are the main export applications of DLX 4J49?
Used in EMI shielding covers, transformer cores, precision instrument sensors, and aerospace electronics.
8. How long is the delivery time?
Standard sizes ship in 7–10 days; customized orders typically within 15–20 days depending on processing complexity.
DLX Alloy’s 4J49 Permalloy plate stands out as a precision-engineered solution for modern magnetic applications. Combining advanced manufacturing, real engineering feedback, and verified performance, our materials enable customers to design with confidence—whether they’re creating high-precision sensors, EMI-shielding housings, or advanced transformer cores. By focusing on material stability, consistency, and customization, DLX continues to help industries achieve reliable magnetic control and efficiency in increasingly demanding environments.
