Welcome to Jiangsu DLX alloy Co., Ltd.
Email:sales8@dlx-alloy.com Mobile/Whatsapp:+86 199 0611 9641
Specialized manufacturer of high temperature alloys, precision alloys and Incoloy,over 20 years.
Whatsapp:+86 199 0611 9641
Email:sales8@dlx-alloy.com
Add:NO.32 West Taihu Road, Xinbei District, Changzhou, Jiangsu,China
Precision Alloy Wire
Product Details

Precision Alloy Wire , particularly 4J29 Kovar wire, is a high-performance material known for its exceptional mechanical properties and dimensional stability. Produced with meticulous precision and stringent quality controls, this alloy wire maintains a fine diameter and uniform structure, making it ideal for a wide range of advanced applications. Its superior resistance to heat, corrosion, and wear ensures long-term reliability, especially in industries like electronics, aerospace, medical technology, and automotive engineering.
The 4J29 Kovar wire is vital for creating intricate electrical connections, precision sensors, and high-strength filaments. Its performance is unmatched in demanding environments, providing consistent and reliable results for critical systems and cutting-edge technologies.
Low Thermal Expansion
4J29 Kovar wire exhibits an exceptionally low coefficient of thermal expansion, making it perfect for applications requiring dimensional stability across wide temperature ranges.
High Strength and Flexibility
The wire combines high tensile strength with excellent flexibility, enabling it to withstand harsh operating conditions, repeated bending, and stress without breaking or deforming.
Superior Corrosion and Oxidation Resistance
The alloy wire offers outstanding resistance to corrosion and oxidation, making it ideal for use in challenging environments where exposure to moisture, heat, and chemicals is frequent.
Precise Manufacturing
Produced with extremely tight tolerances, the wire ensures consistent diameter and mechanical properties, which is crucial for applications where even minor deviations can lead to significant performance issues.
Customizable Alloy Compositions
We offer customization options for the alloy composition, allowing us to fine-tune its electrical, magnetic, and thermal properties according to specific industry needs.


Parameter | Kovar 4J29 Alloy Plate | Other Sealing Alloys |
|---|---|---|
Thermal Expansion (CTE) | Matches borosilicate glass (~5.1 × 10⁻⁶ /K) | Varies, often less compatible |
Temperature Range | -80°C to 450°C | Typically limited to 200–400°C |
Corrosion Resistance | Excellent, resists harsh vacuum conditions | Moderate, varies by alloy |
Weldability | High, supports strong hermetic seals | Inconsistent, some alloys less reliable |
Machinability | Superior, enables precise fabrication | Moderate, may require specialized tools |
Applications | Electronics, aerospace, medical devices | Limited to specific, less critical uses |
Durability | Exceptional, resists thermal stress | Varies, may degrade under extremes |
Customization | Highly customizable (size, form, thickness) | Limited flexibility in customization |
Electronics Industry
In the electronics sector, 4J29 Kovar wire is used for micro-springs, connectors, and sensors. Its low thermal expansion and excellent electrical conductivity ensure stable electrical connections and accurate sensing, essential for high-performance electronic devices.
Aerospace and Defense
Aerospace and defense industries rely on 4J29 Kovar wire for critical components, including aircraft engine parts, missile guidance systems, and communication equipment. Its ability to endure extreme temperatures, high stress, and demanding conditions ensures the safety and reliability of these systems.
Medical Devices
In medical technology, the Kovar wire is used in the production of surgical instruments, orthopedic implants, and cardiovascular devices. Its biocompatibility, high strength, and corrosion resistance make it safe and reliable for medical applications that come into direct contact with the human body.
Automotive Industry
The Kovar wire is also used in automotive applications such as sensors, fuel injection systems, and electrical wiring. Its excellent mechanical properties enhance the overall performance and efficiency of vehicles, contributing to durability and reducing maintenance costs.

Melting
The production process starts by melting high-purity raw materials in an electric arc or induction furnace to produce a clean and homogeneous molten alloy.
Casting
After refining, the molten metal is cast into ingots or billets, which are then subjected to heat treatment to eliminate segregation and ensure uniformity.
Hot Forging
The ingots are heated above 1100°C and hot-forged to refine the microstructure and achieve the desired shape and strength properties.
Hot Rolling
The forged material undergoes hot rolling to reduce thickness and achieve the final dimensions of the wire. This process enhances the directional properties of the alloy.
Annealing
The rolled wire is annealed to relieve internal stresses and improve its ductility, preparing it for further machining.
Finishing
Finally, the wire is cut to the required lengths, and surface treatments such as polishing, coating, or grinding are applied to ensure smoothness and durability.

High Performance
The 4J29 Kovar wire combines outstanding mechanical properties, excellent thermal stability, and reliable corrosion resistance, making it ideal for high-performance applications in extreme conditions.
Customization
We offer tailored alloy compositions and customizable wire dimensions to meet specific application requirements, ensuring optimal performance across various industries.
Precision Manufacturing
Manufactured to tight tolerances, the wire maintains consistent quality and performance, even in the most demanding applications.
Long Service Life
With its resistance to oxidation, corrosion, and wear, the wire ensures durability and long-term reliability, reducing the need for frequent replacements and maintenance.
Versatile Applications
4J29 Kovar wire’s versatility allows it to be used in a wide range of industries, including aerospace, medical devices, automotive, and electronics, offering a one-stop solution for multiple high-tech applications.



CHANGZHOU DLX ALLOY CO, LTD was established in 2002 and has got ISO9001 International Quality Management System Certificate and SGS Certificate. Our factory is professional in researching and producing special alloy material. From melting, drawing, heat treatment, finishing and testing .We offer nickel based, copper-based, and iron-based alloys, including super alloy, welding materials, anti-corrosion alloy, Precision Alloy , FeCrAl alloy, NiCr alloy, CuNi alloy, thermocouple and etc, in the form of wire, strip, ribbon, bar, tube, plate.



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. We also provide chemical analysis reports for every FeCrAl alloy, NiCr alloy, and other products purchased.
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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Q1: What industries use 4J29 Kovar wire?
A1: 4J29 Kovar wire is widely used in industries such as electronics, aerospace, defense, medical devices, and automotive applications due to its excellent thermal stability, strength, and precision.
Q2: Can the 4J29 Kovar wire be customized for specific applications?
A2: Yes, we can customize both the alloy composition and the wire's dimensions to meet specific customer needs, ensuring optimal performance for various applications.
Q3: What is the typical lead time for 4J29 Kovar wire orders?
A3: The typical lead time for sample orders is about 7 days after payment confirmation. Bulk orders may require additional time depending on the quantity and specifications.
Q4: Do you provide free samples of 4J29 Kovar wire?
A4: Yes, we offer free samples for testing. However, the buyer is responsible for the shipping costs.
Q5: How can I place an order or get a quote?
A5: You can contact our sales team directly via email or through our website for inquiries, quotes, or to place an order. We offer 24/7 customer support to assist you with any questions.
Q6: What are your payment terms?
A6: We accept various payment methods including T/T, L/C, D/A, D/P, Western Union, MoneyGram, and PayPal.
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