Our 4J49 Fe-Ni-Cr Alloy Wire is a top choice for high-performance glass-to-metal sealing in electronic devices. With 42% nickel, 5% chromium, and 53% iron, it offers a CTE of ~5.5 ppm/°C (20-450°C), perfectly matching glass for airtight seals. It’s durable, corrosion-resistant, and easy to work with, making it ideal for precision electronics. Whether you’re building semiconductors or medical sensors, our 4J49 wire ensures your components stay sealed and reliable.
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The electronics industry is booming, with a projected CAGR of 5.9% through 2032, driven by 5G, IoT, and medical technology. Glass-to-metal seals are critical for hermetic packaging in semiconductors, microwave components, and sensors, where reliability is non-negotiable. As devices get smaller and more complex, materials like our 4J49 wire are in high demand for their ability to maintain seal integrity under thermal stress. The rise of smart devices and medical electronics further fuels the need for high-performance sealing alloys, and we’re ready to meet those demands.
| 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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Our 4J49 Fe-Ni-Cr Alloy Wire is a star in electronic applications. It’s used in vacuum tubes and semiconductor packaging, ensuring airtight seals for sensitive components. Microwave components, like waveguides and filters, rely on 4J49 for stable performance in telecommunications. In medical devices, it’s perfect for sensors and implants where reliability and biocompatibility are key. Aerospace electronics also benefit from its thermal stability in high-altitude or space environments. Wherever precision sealing is needed, our 4J49 wire delivers.
Comparison Table: 4J49 Fe-Ni-Cr vs. 4J47 Nickel-Iron vs. Kovar
Parameter | 4J49 Fe-Ni-Cr | 4J47 Nickel-Iron | Kovar |
|---|---|---|---|
Composition | 42% Ni, 5% Cr, 53% Fe | 47% Ni, 53% Fe | 29% Ni, 17% Co, 54% Fe |
CTE (ppm/°C, 20-450°C) | ~5.5 | ~4.7 | ~5.0 |
Temperature Range | -50°C to 450°C | -40°C to 350°C | -50°C to 400°C |
Curie Temperature | ~390°C | ~410°C | ~435°C |
Yield Strength (MPa) | ~345 | ~330 | ~345 |
Tensile Strength (MPa) | ~550 | ~540 | ~520 |
Density (g/cm³) | 8.20 | 8.18 | 8.36 |
Applications | Semiconductor packaging, vacuum tubes | Precision tooling, optical mounts | Glass-to-metal seals, electronics |
Oxidation Resistance | Excellent | Excellent | Excellent |
We know the market has plenty of sealing alloys, but our 4J49 Fe-Ni-Cr Alloy Wire stands out. Our strict quality control ensures a consistent CTE and robust mechanical properties (yield strength ~345 MPa, tensile strength ~550 MPa). We offer customized wire sizes and finishes to meet your exact specs, with faster lead times than many alternatives. Our efficient production process keeps costs low without sacrificing quality, and our alloy’s superior CTE matching and corrosion resistance give it an edge in high-performance electronics. With years of expertise, we’re your trusted partner for advanced alloy solutions.
Why Choose Our 4J49 Fe-Ni-Cr Alloy Wire?
Our 4J49 Fe-Ni-Cr Alloy Wire is built for the future of electronics. Its precise thermal expansion, durability, and corrosion resistance make it perfect for semiconductor packaging, medical sensors, and more. Whether you’re pushing the boundaries of 5G or building life-saving devices, our wire ensures your components stay sealed and reliable. Contact us today to see how 4Jatom can power your next project!
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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FAQs
What is 4J49 Fe-Ni-Cr Alloy Wire?
It’s a nickel-iron-chromium alloy wire designed for high-performance glass-to-metal sealing in electronic devices, offering excellent thermal expansion matching.What are the key properties of 4J49?
It has a CTE of ~5.5 ppm/°C (20-450°C), superior corrosion resistance, and high mechanical strength, ideal for hermetic sealing.What industries use 4J49 Alloy Wire?
Electronics, telecommunications, aerospace, and medical device industries rely on it for reliable sealing in critical components.What are common applications for 4J49?
It’s used in vacuum tubes, semiconductor packaging, microwave components, and medical sensors requiring airtight seals.How does 4J49 compare to other sealing alloys?
Its Ni-Cr-Fe composition ensures a precise CTE match with glass, providing better seal durability than many comparable alloys.What temperature range is 4J49 effective in?
It performs reliably from -50°C to 450°C, maintaining seal integrity in demanding electronic environments.Is 4J49 weldable or machinable?
Yes, it’s weldable and machinable with standard techniques, though careful control is needed to prevent work hardening.How does 4J49 align with industry trends?
It supports the demand for miniaturized, high-reliability components in 5G, IoT, and medical electronics, driven by technological advancements.
