The 4J34 Nickel-Iron Alloy Plate, also known as Ni34Fe66, is a high-precision material engineered for low thermal expansion applications. Its unique combination of thermal stability, mechanical strength, and corrosion resistance makes it ideal for hermetic sealing, optical devices, and precision electronic assemblies.
At DLX Alloy, we focus on producing high-quality 4J34 plates with consistent chemical composition, precise thickness, and superior surface finish, ensuring dependable performance in critical applications where dimensional stability is paramount.
|
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.
4J34 is a nickel-iron alloy containing approximately 34% nickel and 66% iron, designed to provide a controlled low coefficient of thermal expansion (CTE). This property allows it to maintain dimensional accuracy and integrity when paired with glass, ceramics, and other optical or electronic substrates.
Key material properties include:
-
Low thermal expansion for dimensional stability in temperature-sensitive environments
-
Excellent mechanical strength and ductility for structural integrity
-
Corrosion and oxidation resistance for long-term durability
-
Stable magnetic and electrical properties
-
High machinability and processability for precision forming, cutting, and finishing
DLX Alloy uses vacuum induction melting, precision rolling, and controlled annealing to produce 4J34 plates with uniform microstructure, low internal stress, and excellent surface quality, essential for hermetic sealing and optical device applications.
Applications
4J34 alloy plates are widely used in applications where thermal expansion matching and mechanical stability are critical:
-
Hermetic sealing: vacuum tubes, optical enclosures, and sensor housings
-
Optical devices: lenses, optical sensors, and laser components requiring minimal dimensional drift
-
Electronic packaging: substrates and frames for high-reliability electronics
-
Glass-to-metal sealing: ensuring hermeticity and preventing stress or cracks
-
Precision instrumentation: scientific, aerospace, and measurement devices
-
Relays and switches in precision electronic assemblies
DLX Alloy provides customizable plate thickness, dimensions, and surface finishes, allowing seamless integration into high-precision optical and electronic assemblies.
Industry Trends
The demand for low-expansion alloys is growing across optical, aerospace, and electronic industries, driven by the need for components that maintain dimensional integrity under temperature fluctuations.
Current trends influencing 4J34 usage include:
-
Miniaturization of optical and electronic devices, where even small expansion mismatches can cause misalignment or failure
-
Advanced semiconductor packaging, requiring substrates with matched CTEs to prevent stress and improve device reliability
-
Aerospace and defense electronics, where temperature variations demand materials with stable dimensions
-
High-precision scientific instrumentation, needing minimal thermal drift for accurate measurements
DLX Alloy meets these industry demands by producing 4J34 plates with tight chemical control, uniform microstructure, and precise dimensional tolerances, ensuring consistent performance in high-precision and temperature-sensitive applications.
| Property / Alloy | 4J34 | 4J36 (Invar) | 4J33 | 4J42 |
|---|---|---|---|---|
| Nickel Content (%) | 34 | 36 | 33 | 42 |
| CTE (20–100°C, ×10⁻⁶/°C) | 2.5 | 1.2 | 3.0 | 2.0 |
| Density (g/cm³) | 8.05 | 8.1 | 8.0 | 8.1 |
| Yield Strength (MPa) | 230–330 | 250–350 | 220–320 | 300–400 |
| Thermal Stability | Very Good | Excellent | Good | Very Good |
| Corrosion Resistance | Good | Good | Good | Good |
| Typical Applications | Hermetic sealing, optical devices | Aerospace instruments, precision tools | Sensors, vacuum devices | Glass-to-metal seals, low-expansion frames |
| Processability | Good | Excellent | Good | Good |
This table highlights that 4J34 provides an optimal balance of low thermal expansion, mechanical stability, and manufacturability, making it perfect for hermetic sealing and optical applications where dimensional precision is critical.
Why Choose DLX Alloy
DLX Alloy combines advanced metallurgical expertise with modern production technology to deliver superior 4J34 plates.
Our advantages include:
-
Vacuum induction melting for chemical uniformity and minimal impurities
-
Precision rolling and annealing to reduce internal stress and enhance microstructure
-
Strict dimensional control for reliable integration into optical and electronic devices
-
Custom surface finishes suitable for plating, coating, or hermetic sealing
-
Comprehensive testing including CTE, mechanical, and chemical properties
These advantages ensure that DLX 4J34 plates are consistent, reliable, and durable, meeting the demanding requirements of optical, electronic, and aerospace industries.
DLX Production and Quality Assurance
DLX Alloy employs state-of-the-art production facilities and rigorous quality control:
-
Vacuum induction melting for chemical homogeneity
-
Precision rolling and controlled annealing for uniform thickness and stress relief
-
Dimensional and surface inspections for flatness, thickness, and finish quality
-
CTE and mechanical property verification for every batch
DLX Alloy also offers customized 4J34 plates tailored to specific application requirements, ensuring seamless integration into high-precision optical and electronic systems.
Sustainability and Market Outlook
The market for low-expansion alloy plates continues to grow due to the rise of precision electronics, optical devices, and aerospace applications. Components require materials that maintain dimensional stability under thermal cycling, which is critical for long-term reliability.
DLX Alloy incorporates sustainable production practices, including recycling scrap metal, minimizing waste, and optimizing energy consumption. As optical and electronic applications continue to expand, DLX is well-positioned to supply high-quality, reliable 4J34 plates for global markets.
4J34 Low Expansion Alloy Plate is a key material for hermetic sealing, optical devices, and high-precision electronics, providing low thermal expansion, mechanical stability, and corrosion resistance. Its properties ensure reliable performance where temperature fluctuations could compromise accuracy or functionality.
DLX Alloy guarantees high-quality 4J34 plates with consistent chemical composition, precise dimensional control, and excellent thermal performance, supporting customers in optical, electronic, and aerospace industries worldwide.
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 is the composition of 4J34?
Approximately 34% nickel and 66% iron, designed for low thermal expansion in precision applications.
2. What is the main benefit of 4J34 plates?
Controlled thermal expansion ensures dimensional stability for hermetic sealing and optical devices.
3. Which industries use 4J34 plates?
Optical devices, electronics, aerospace, sensors, and semiconductor packaging.
4. How does 4J34 compare to 4J36?
4J36 has slightly lower CTE, but 4J34 provides excellent balance for optical and electronic applications.
5. Can DLX Alloy customize plate sizes and thickness?
Yes, DLX offers tailored dimensions, thicknesses, and surface finishes for specific requirements.
6. Is 4J34 suitable for glass-to-metal sealing?
Yes, its thermal expansion is compatible with glass and ceramics, preventing stress or cracking.
7. What heat treatment improves 4J34 properties?
Controlled annealing reduces internal stress and enhances thermal stability.
8. Does DLX Alloy provide testing reports?
Yes, each batch comes with CTE, mechanical, and chemical analysis documentation.
