4J34, also known as a nickel–iron controlled Expansion Alloy , is mainly composed of 36% nickel and the rest iron, with minor elements such as cobalt and silicon for enhanced stability. The alloy’s standout property is its extremely low coefficient of thermal expansion, making it ideal for applications that demand dimensional stability under temperature changes. This alloy is commonly used in aerospace instruments, precision measuring components, and electronic control devices.
DLX Company supplies high-precision 4J34 wire with tight tolerance control, uniform composition, and superior surface finish. Our manufacturing process ensures exceptional stability and consistency, meeting the demanding requirements of high-end aerospace and electronic applications.
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The aerospace industry demands materials that can maintain precise mechanical and dimensional stability under extreme thermal conditions. As satellite instruments, gyroscopic sensors, and navigation control systems operate across wide temperature ranges, materials like 4J34 are essential.
Key Application Fields:
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Aerospace instruments: Gyroscopes, accelerometers, and satellite positioning systems use 4J34 for its minimal expansion and stability.
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Precision measurement tools: Used in high-accuracy micrometers, gauges, and laser measuring systems.
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Electronic control devices: In thermostats, relays, and sensor housings that require dimensional consistency.
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Cryogenic and vacuum systems: Where temperature gradients can cause expansion or contraction issues, 4J34 ensures mechanical integrity.
The global demand for 4J34 wire continues to grow due to the miniaturization of aerospace sensors and the shift toward high-precision satellite equipment. Countries investing in space exploration and defense systems also stimulate market growth. DLX Company keeps pace by refining alloy purity and ensuring precise thermal control during wire drawing and annealing.
| Elements | 4J29 | 4J36 | |
| Carbon (C) | Not greater than | 0.03 | 0.05 |
| Sulfur (S) | 0.02 | 0.02 | |
| Phosphorus (P) | 0.02 | 0.02 | |
| Manganese (Mn) | ≤0.50 | 0.20-0.60 | |
| Silicon (Si) | ≤0.30 | ≤0.30 | |
| Nickel (Ni) | 28.5-29.5 | 35.0-37.0 | |
| Chromium (Cr) | - | - | |
| Cobalt (Co) | 16.8-17.8 | - | |
| Iron (Fe) | Rest | Rest | |
| Other Elements |
| Alloy Grade | 20°C-100°C | 20°C-300°C | 20°C-500°C |
| 4J36 Invar Alloy | 1.2×10⁻⁶ /°C | 2.5×10⁻⁶ /°C | - |
| 4J29 Kovar Alloy | 4.6×10⁻⁶ /°C | 5.5×10⁻⁶ /°C | 6.2×10⁻⁶ /°C |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Density (g/cm³) | 8.1 | 8.2 |
| Tensile Strength (MPa) | 500-600 | 600-700 |
| Yield Strength (MPa) | 250-350 | 300-400 |
| Hardness (HV) | 150-200 | 200-250 |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Electrical Resistivity (10⁻⁶ Ω·cm) | 80 | 50 |
| Thermal Conductivity (W/m·K) | 10-12 | 16-18 |
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DLX stands out as a professional manufacturer of high-performance alloy wires with strict quality assurance and advanced production capabilities.
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Tight Composition Control:
DLX’s 4J34 wire is melted and refined using vacuum induction and vacuum arc remelting processes to ensure stable nickel–iron ratios and eliminate impurities. -
Precision Drawing Technology:
Our fine wire drawing and annealing process maintains exceptional tolerance, ensuring the wire’s diameter and resistivity remain consistent throughout long production runs. -
Custom Engineering Support:
DLX engineers work closely with clients in aerospace and instrumentation sectors, offering tailored wire diameters, spooling formats, and surface conditions. -
High Temperature and Dimensional Stability:
The thermal expansion and magnetization stability of our wire meet stringent aerospace standards, supporting reliable long-term operation. -
Sustainability and Traceability:
DLX ensures every batch of 4J34 wire can be traced back to its raw materials, supporting both quality audits and sustainability goals. -
In-House Testing Facilities:
All wires undergo tensile strength testing, resistivity checks, and microscopic structure verification before shipment.
| Property | 4J34 Wire | 4J36 (Invar) Wire | Kovar-Type Wire |
|---|---|---|---|
| Main Composition | Ni 36%, Fe balance | Ni 36%, Fe balance | Ni 29%, Co 17%, Fe balance |
| Density (g/cm³) | 8.1 | 8.1 | 8.3 |
| Melting Point (°C) | 1430 | 1430 | 1450 |
| Coefficient of Thermal Expansion (20–200°C, ×10⁻⁶/°C) | 4.5 | 1.2 | 5.0 |
| Electrical Resistivity (μΩ·m) | 0.78 | 0.78 | 0.5 |
| Tensile Strength (MPa) | 450–550 | 450–500 | 500–600 |
| Magnetic Permeability | High | Very High | Moderate |
| Typical Applications | Aerospace, sensors, precision instruments | Clocks, measuring tools | Glass-to-metal seals |
The market for controlled expansion alloys is shifting toward high-precision applications. Aerospace, electronics, and quantum sensor industries increasingly depend on materials like 4J34 that ensure precision under dynamic environments. With global aerospace manufacturing expanding—especially in satellites, defense technology, and next-generation communication—demand for 4J34 wire will remain strong.
DLX Company aligns with this trend by expanding our production of fine wire grades suitable for micro-component assembly and automated winding. We also integrate digital quality monitoring throughout the production process to guarantee every spool meets specification.
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:
1. What is 4J34 wire made of?
It’s a nickel–iron alloy containing about 36% nickel and balance iron, designed for low thermal expansion and stable performance.
2. Why is 4J34 suitable for aerospace applications?
Because of its excellent dimensional stability under temperature changes, it ensures precise performance in aerospace navigation and measurement instruments.
3. What is the typical operating temperature range for 4J34 wire?
It performs well between -60°C and 300°C, with minimal expansion across this range.
4. Can DLX provide custom diameters for 4J34 wire?
Yes. DLX offers wire diameters from 0.05 mm to 5.0 mm with customized tolerance levels.
5. Does 4J34 wire have good magnetic properties?
Yes, it has moderate to high magnetic permeability, making it suitable for magnetic shielding and sensor components.
6. How does 4J34 compare to Invar (4J36)?
4J36 has an even lower thermal expansion but lower mechanical strength. 4J34 offers a balance between mechanical durability and expansion control.
7. Is 4J34 resistant to oxidation?
It has moderate oxidation resistance. For harsh environments, DLX can apply protective coatings.
8. What are DLX’s typical delivery forms?
We supply in coils, straight-cut rods, or spooled wire formats, ready for immediate integration into production lines.
DLX Company Perspective
At DLX, precision isn’t just a metric—it’s our standard. The growing aerospace and instrumentation markets need materials that can perform reliably where even a fraction of expansion can cause failure. Our 4J34 wire embodies this philosophy. From the alloy’s formulation to final inspection, every stage is optimized for uniformity and repeatability.
We collaborate with engineers and procurement teams worldwide, supporting innovation with stable supply and technical insight. Whether it’s for flight control instruments, precision balancing tools, or miniature electronic components, DLX ensures every meter of 4J34 wire exceeds performance expectations.
