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Help Center4J29 Iron-Nickel Alloy Plate With Controlled Expansion for Electronic Packaging
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As Jiangsu Zhonggongte Metallurgical Technology Co., Ltd., a globally active supplier established in 2022 with annual exports exceeding $100 million USD, we specialize in providing high-performance metallic solutions. Our 4J29 Iron-Nickel Alloy Plate is engineered specifically for the demanding requirements of advanced electronic packaging. This material, also widely known as Kovar alloy, offers exceptional dimensional stability crucial for creating reliable hermetic seals in sensitive electronic components like transistors, ICs, and laser diodes. Our commitment to ISO9001 certified processes ensures consistent quality and performance you can depend on for your critical applications.
Why Choose Our 4J29 Alloy Plate?
- Precision Thermal Matching: The defining characteristic of 4J29 alloy is its carefully controlled coefficient of thermal expansion (CTE), designed to closely match that of borosilicate glass (e.g., Pyrex) and certain ceramics (e.g., alumina). This minimizes thermal stress during sealing processes and throughout the operational temperature range, preventing cracking and ensuring long-term hermeticity essential for protecting sensitive electronics from moisture and contaminants.
- Superior Sealing Performance: Enables the creation of robust, leak-tight seals between metal and glass or ceramic components, critical for vacuum tubes, microwave packages, optical modules, and aerospace electronics operating in harsh environments.
- Excellent Fabrication Characteristics: Despite its specialized properties, 4J29 alloy maintains good machinability, formability, and weldability (using compatible techniques like TIG, electron beam, or resistance welding), allowing for complex part fabrication.
- High Temperature Stability: Maintains its mechanical integrity and low CTE properties reliably across a wide temperature range, typically from cryogenic temperatures up to approximately 450°C (842°F).
- Corrosion Resistance: Offers good resistance to atmospheric corrosion, enhancing the longevity of the packaged components.
Technical Specifications & Properties:
| Property | Typical Value / Range | Units | Notes |
| Chemical Composition (Nominal) | Fe-29Ni-17Co | wt% | Conforms to ASTM F15, GBn 103, etc. |
| Average CTE (20-300°C) | 4.6 - 5.2 | x10-6/K | Matches borosilicate glass |
| CTE (20-400°C) | 5.0 - 5.8 | x10-6/K | Matches alumina ceramics |
| Density | ~8.36 | g/cm³ | |
| Tensile Strength | 517 - 586 | MPa | Annealed Condition |
| Yield Strength (0.2% Offset) | 345 - 414 | MPa | Annealed Condition |
| Elongation | ≥ 30 | % | Annealed Condition |
| Curie Temperature | ~435 | °C | |
| Thermal Conductivity (20°C) | ~17 | W/(m·K) | |
| Electrical Resistivity | ~0.49 | μΩ·m | At 20°C |
Key Advantages for Your Business:
- Enhanced Product Reliability: Minimize field failures in electronic assemblies caused by thermal stress-induced seal leaks or component cracking, leading to lower warranty costs and higher customer satisfaction.
- Process Optimization: Achieve consistent, high-yield sealing processes due to the predictable and reliable thermal expansion behavior of 4J29, reducing scrap and rework.
- Design Flexibility: Utilize the alloy's formability to create complex lead frames, housings, and feedthroughs tailored to specific packaging geometries.
- Material Consistency: Benefit from our strict ISO9001 quality control throughout the melting, rolling, and finishing stages, ensuring every plate meets the precise CTE and mechanical property requirements.
- Global Supply Chain Support: Leverage our established logistics network with shipment capabilities from major ports like Shanghai and Tianjin, ensuring timely delivery across North America, Europe, Asia, and other key global markets.
Trust Jiangsu Zhonggongte Metallurgical Technology to be your reliable partner for critical 4J29 alloy plates. Backed by ISO9001 certification, a significant annual export volume exceeding $100 million USD, and a workforce of 51-100 dedicated professionals, we possess the scale, expertise, and global reach (including overseas offices) to consistently meet your demands. We serve diverse industries worldwide, from Eastern Asia and North America to Europe, Africa, and Oceania, demonstrating our proven ability to deliver high-quality materials reliably. Our extensive port access ensures efficient logistics. Choose our 4J29 plates for unmatched thermal expansion control and hermetic sealing performance in your most demanding electronic packaging applications. Contact us today for a quotation, detailed specifications, or to discuss your custom requirements.
Frequently Asked Questions (FAQ):
Q1: What is the typical lead time for 4J29 alloy plates?
A1: Lead times vary based on specific dimensions (thickness, width, length), quantity, and required surface finish. Standard sizes may have shorter lead times. Please inquire with your specific requirements for an accurate estimate.
Q2: What is your Minimum Order Quantity (MOQ) for this alloy plate?
A2: MOQ can vary. We strive to be flexible to accommodate both prototyping needs and large-scale production runs. Please discuss your volume requirements with us.
Q3: Can you provide material certification with the plates?
A3: Yes, we provide standard Mill Test Certificates (MTCs) with each shipment, detailing chemical composition and key mechanical properties. Additional certifications are available upon request.
Q4: Is 4J29 alloy the same as Kovar?
A4: Yes, 4J29 is the Chinese standard designation (GBn) for the alloy commonly known internationally as Kovar (ASTM F15). They refer to the same Fe-Ni-Co alloy with controlled expansion properties.
Q5: What surface finishes are available?
A5: We typically supply plates with a mill finish. Other finishes like cold-rolled bright, pickled, or polished surfaces can be arranged based on customer specifications and order volume.
Q6: Can you supply 4J29 plates in custom sizes or shapes?
A6: Yes, we offer cutting services to provide plates in custom dimensions (width, length). For complex shapes, blanking or machining services may be available; please inquire for details.
Q7: Do you offer samples for evaluation?
A7: Sample requests are considered, especially for new customers or specific applications. Availability and terms depend on the requested size and finish. Contact us to discuss your sampling needs.
Q8: What packaging is used for shipment?
A8: Plates are carefully packaged to prevent damage during transit. Standard packaging includes wooden crates or pallets with protective wrapping. Special packaging requirements can be accommodated.
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