The 4J33 Nickel-Iron Alloy Plate, also referred to as Ni33Fe67, is a precision-engineered material specifically designed for thermal expansion controlled applications. Its combination of low coefficient of thermal expansion (CTE), mechanical stability, and corrosion resistance makes it ideal for vacuum devices, high-precision sensors, and glass-to-metal sealing applications.
At DLX Alloy, we focus on delivering high-quality 4J33 plates with consistent composition, superior surface finish, and tight dimensional tolerances, ensuring reliable performance in systems where thermal expansion mismatches could compromise functionality.
4J33 is composed of approximately 33% nickel and 67% iron, giving it a controlled low thermal expansion that closely matches glass, ceramics, and other substrate materials. This property makes it particularly suitable for applications where hermetic sealing and dimensional stability are critical.
Key material properties include:
-
Low thermal expansion to match glass or ceramic components
-
Excellent mechanical strength and ductility
-
Good corrosion and oxidation resistance
-
Stable magnetic and electrical properties
-
High processability for precision machining, welding, and forming
DLX Alloy produces 4J33 plates using vacuum induction melting, precision rolling, and controlled annealing. These processes ensure uniform microstructure, low internal stress, and superior surface quality, which are essential for vacuum and sensor applications.
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 |
|
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.
The 4J33 alloy plate is widely used in temperature-sensitive and precision-critical systems:
-
Vacuum devices: vacuum tubes, electron tubes, and hermetic enclosures
-
Sensors and transducers: pressure sensors, temperature sensors, and precision measurement devices
-
Glass-to-metal sealing: ensuring reliable hermeticity and dimensional stability
-
Electronic packaging: for semiconductor and high-reliability electronics
-
Relays and switches in precision instruments
-
Scientific and aerospace instrumentation requiring low thermal drift
DLX Alloy customizes 4J33 plates for specific thicknesses, dimensions, and surface finishes, ensuring seamless integration into high-precision assemblies.
Industry Trends
As industries like aerospace, electronics, and sensor technology evolve, materials with low thermal expansion and high stability are increasingly essential. Precision components now demand metals that expand consistently with glass or ceramic materials to maintain hermetic seals and prevent stress-related failures.
Trends impacting 4J33 demand include:
-
Miniaturization of electronics, where even small expansion mismatches can cause failures
-
Advanced aerospace and space applications, needing components that endure extreme thermal cycles
-
High-precision scientific instrumentation requiring stable and reliable performance
-
Semiconductor packaging with hermetic or semi-hermetic enclosures
DLX Alloy addresses these needs by producing 4J33 plates with tightly controlled chemical composition, uniform microstructure, and precise dimensional tolerances, ensuring optimal performance in critical applications.
| Property / Alloy | 4J33 | 4J36 (Invar) | 4J29 (Kovar) | 4J42 |
|---|---|---|---|---|
| Nickel Content (%) | 33 | 36 | 29 | 42 |
| CTE (20–100°C, ×10⁻⁶/°C) | 3.0 | 1.2 | 5.0 | 2.0 |
| Density (g/cm³) | 8.0 | 8.1 | 8.2 | 8.1 |
| Yield Strength (MPa) | 220–320 | 250–350 | 250–350 | 300–400 |
| Thermal Stability | Good | Excellent | Moderate | Very Good |
| Corrosion Resistance | Good | Good | Moderate | Good |
| Typical Applications | Vacuum devices, sensors, glass-to-metal seals | Precision instruments, aerospace | Semiconductor packaging | Low-expansion frames, glass-to-metal seals |
| Processability | Good | Excellent | Moderate | Good |
This table shows that 4J33 offers a balance of low thermal expansion and good mechanical properties, making it ideal for vacuum devices, sensors, and glass-to-metal sealing applications where tight tolerances are critical.
Why Choose DLX Alloy
DLX Alloy combines material science expertise with advanced production technology to produce high-performance 4J33 plates.
Our advantages include:
-
Vacuum induction melting for chemical uniformity and minimal impurities
-
Precision rolling and annealing to optimize microstructure and reduce residual stress
-
Strict dimensional tolerances for assembly precision
-
Custom surface finishes optimized for sealing, coating, or plating
-
Comprehensive testing including CTE, mechanical, and chemical properties
These advantages ensure DLX 4J33 plates are reliable and durable, meeting the exacting demands of vacuum devices, sensors, and precision electronics.
DLX Production and Quality Assurance
DLX Alloy uses state-of-the-art facilities and rigorous quality control to guarantee consistent 4J33 performance:
-
Vacuum induction melting to ensure chemical purity and homogeneity
-
Precision rolling and annealing for uniform thickness and stress relief
-
Dimensional inspections for flatness, thickness, and surface quality
-
CTE and mechanical property verification for each batch
DLX Alloy also provides customized plates with tailored dimensions, thicknesses, and surface treatments, ensuring compatibility with demanding vacuum and sensor applications.
With growing demand for high-precision, thermally stable materials, 4J33 plates are increasingly important in aerospace, electronics, and sensor technologies.
DLX Alloy incorporates sustainable production practices, including minimizing waste, recycling scrap material, and optimizing energy efficiency during melting and rolling processes. As precision electronics and vacuum devices continue to grow, DLX is well-positioned to supply high-quality, reliable 4J33 plates to meet global market demands.
4J33 Nickel-Iron Alloy Plate is essential for vacuum devices, sensors, and glass-to-metal sealing applications, offering controlled thermal expansion, mechanical stability, and excellent processability. Its combination of properties ensures reliable performance in precision assemblies where temperature variation could otherwise compromise functionality.
DLX Alloy guarantees high-quality 4J33 plates with consistent chemical composition, tight dimensional tolerances, and superior thermal performance, supporting customers in electronics, aerospace, and instrumentation 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 4J33?
It contains approximately 33% nickel and 67% iron, designed for low thermal expansion matching with glass.
2. What is the main benefit of 4J33 plates?
Controlled thermal expansion ensures dimensional stability for vacuum devices and sensors.
3. Which industries use 4J33 plates?
Aerospace, precision electronics, sensors, vacuum devices, and semiconductor packaging.
4. How does 4J33 compare to 4J36?
4J36 has slightly lower CTE, but 4J33 provides cost-effective performance for many vacuum and sealing applications.
5. Can DLX Alloy provide custom plate sizes and thickness?
Yes, tailored dimensions, thicknesses, and surface finishes are available.
6. Is 4J33 suitable for glass-to-metal sealing?
Yes, its CTE closely matches glass and ceramics to prevent cracking or leakage.
7. What heat treatment improves 4J33 properties?
Controlled annealing reduces internal stress and ensures dimensional stability.
8. Does DLX Alloy provide testing reports?
Yes, every batch comes with CTE, mechanical, and chemical analysis reports.
