The 4J45 nickel-iron alloy, known for its excellent dimensional stability and precise thermal expansion control, has become a cornerstone material for precision electronic components. At DLX Alloy, we produce high-stability 4J45 wire designed specifically for applications that demand exceptional consistency under varying temperature conditions. From microelectronic sensors to semiconductor packaging and vacuum sealing systems, our 4J45 wire delivers the performance and reliability that modern industries rely on.
For more details, pls directly contact us.
4J45 is a controlled Expansion Alloy containing approximately 45% nickel and 55% iron. This unique composition gives it a low coefficient of thermal expansion (CTE) that matches well with glass, ceramic, and semiconductor materials. By minimizing stress caused by temperature fluctuations, 4J45 ensures long-term mechanical and electrical integrity in complex assemblies.
DLX Alloy’s 4J45 wire is produced using advanced vacuum melting, precision cold drawing, and controlled atmosphere annealing. This combination guarantees uniform grain structure, superior surface finish, and precise mechanical strength—all essential for applications that require both reliability and stability.
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.
Consistent thermal expansion between 5.3×10⁻⁶ to 5.5×10⁻⁶/°C (20–400°C)
Excellent thermal stability and mechanical strength
Strong bonding compatibility with glass and ceramic materials
Stable resistivity and minimal magnetic hysteresis
Good ductility for forming and welding processes
The controlled expansion and mechanical properties of 4J45 make it ideal for a wide variety of precision electronic applications, including:
Semiconductor Packages: Prevents cracking and delamination in high-reliability electronic packages.
Glass-to-Metal and Ceramic Seals: Ensures hermetic seals in sensors, vacuum tubes, and relay systems.
Precision Resistors and Relays: Maintains tight tolerances for resistance and switching components.
Aerospace Electronics: Used in devices requiring minimal expansion under extreme temperatures.
Optoelectronic Assemblies: Provides dimensional stability for laser diodes and photodetectors.
Magnetic Shields and Sensor Housings: Reduces interference while maintaining physical stability.
At DLX Alloy, we customize 4J45 wire properties—diameter, mechanical strength, surface condition—to match customer-specific sealing and manufacturing needs, ensuring compatibility with both manual and automated production lines.
Industry Trends
The electronics and semiconductor industries are entering an era where precision and reliability define competitive advantage. As devices become smaller and more powerful, internal stresses caused by temperature changes are more pronounced. Manufacturers are increasingly turning to materials like 4J45 for controlled expansion and dimensional stability.
In addition, the rise of automotive electronics, aerospace systems, and high-frequency communication devices is expanding the use of 4J45 in components that must perform consistently under harsh thermal environments. The market trend clearly shows that controlled expansion alloys are replacing traditional steels and copper alloys in many precision applications.
At DLX Alloy, we’ve observed continuous growth in demand for 4J45 wire from clients developing semiconductor lead frames, vacuum sealing parts, MEMS devices, and high-reliability sensors. This growth reflects the broader move toward higher-quality, longer-lasting, and thermally stable materials in global manufacturing.
| Property | 4J45 Alloy | 4J42 Alloy | Stainless Steel 304 |
|---|---|---|---|
| Nickel Content (%) | ~45 | ~42 | 8–10 |
| Coefficient of Thermal Expansion (×10⁻⁶/°C) | 5.3–5.5 | 5.0–5.3 | 17.3 |
| Density (g/cm³) | 8.15 | 8.12 | 7.9 |
| Electrical Resistivity (μΩ·m) | 0.47 | 0.49 | 0.73 |
| Tensile Strength (MPa) | 450–650 | 450–600 | 520–720 |
| Thermal Conductivity (W/m·K) | 15.5 | 14.8 | 16.3 |
| Corrosion Resistance | Moderate | Moderate | High |
| Sealing Compatibility | Excellent with Glass/Ceramic | Excellent | Poor |
While 4J42 and 4J45 share similar compositions, 4J45 offers slightly higher thermal expansion, making it better suited for applications where the sealing material expands more than glass or where high-temperature cycling occurs. Compared to stainless steel, 4J45 provides far superior thermal stability and bonding performance, making it indispensable for semiconductor and aerospace-grade precision components.
DLX Alloy Advantages
DLX Alloy is a trusted name in the development and manufacturing of precision nickel-iron alloys. We’ve refined our production process to deliver consistent and high-quality 4J45 wire that meets the demands of modern electronic systems.
1. Advanced Metallurgical Control
Our 4J45 wire is produced using vacuum induction melting and secondary refining, ensuring uniform chemical composition and minimal impurities for precise thermal expansion.
2. Precision Processing
Through advanced cold drawing and intermediate annealing, we achieve excellent surface quality, dimensional consistency, and mechanical balance—key to ensuring stability in sensitive components.
3. Custom Engineering Support
DLX Alloy provides tailored solutions for specific temperature coefficients, diameters, or tensile requirements. We collaborate closely with customers to optimize performance in their production processes.
4. Comprehensive Quality Testing
Each batch of 4J45 wire undergoes rigorous mechanical, chemical, and expansion tests to guarantee compliance with international precision standards.
5. Reliable Supply Chain
With efficient logistics and production capacity, DLX Alloy supports global customers with consistent material availability and timely delivery.
Our company’s mission is clear—to help customers achieve reliable performance and longer component lifespans through precision-engineered alloy materials.
Market Outlook
As the demand for miniaturized, high-reliability electronics continues to grow, the importance of controlled expansion alloys like 4J45 is expected to increase. The global trend toward electric vehicles, space exploration, and semiconductor miniaturization requires materials with both thermal and structural stability.
DLX Alloy continues to innovate by improving 4J45 wire through refined heat treatments, alloy optimization, and advanced process control. Our R&D team focuses on ensuring the material’s stability across broader temperature ranges and enhancing its compatibility with new-generation ceramics and sealing glasses.
The shift toward smarter devices and precision electronic components ensures that 4J45 wire will remain a key enabler of next-generation technologies—and DLX Alloy will remain a key player supporting this evolution.
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:
1. What is 4J45 alloy used for?
It’s widely used in precision electronic components such as semiconductor packages, glass-to-metal seals, and vacuum devices.
2. Why is 4J45 called a “controlled expansion alloy”?
Because its thermal expansion coefficient is engineered to match glass and ceramic materials, minimizing stress from temperature changes.
3. What are the benefits of using 4J45 wire?
It offers excellent dimensional stability, sealing reliability, and consistent mechanical properties under varying temperatures.
4. How does 4J45 differ from 4J42?
4J45 has slightly higher thermal expansion, making it better for certain ceramics or higher-temperature environments.
5. Can 4J45 be used for magnetic applications?
While it has magnetic properties, it’s primarily used for dimensional control rather than magnetic performance.
6. Does DLX Alloy provide surface customization?
Yes. We offer bright, oxidized, and annealed finishes depending on your production needs.
7. How is 4J45 wire tested for quality?
We perform CTE testing, tensile testing, chemical analysis, and microstructure inspection on every batch.
8. Which industries commonly use 4J45 wire?
Semiconductors, aerospace, precision instrumentation, and high-reliability electronic systems.
