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

Kovar 4J29 precision alloy wire is a premium material recognized for its outstanding mechanical and physical properties. Manufactured with the highest precision and stringent quality control standards, this alloy wire boasts a fine diameter and a uniform structure that deliver exceptional tensile strength and flexibility. Due to its remarkable resistance to corrosion, heat, and wear, Kovar 4J29 alloy wire is highly versatile, suitable for use in demanding industries such as aerospace, electronics, and medical technology.
This precision alloy wire is ideal for creating intricate electrical connections, precision sensors, and high-strength filaments. It plays a crucial role in advancing cutting-edge technologies, ensuring reliable performance in complex systems that require durability and precision. The alloy's excellent stability under extreme conditions makes it indispensable for aerospace applications, where reliability and precision are paramount.
Parameter | Kovar 4J29 | Alloy 42 (4J42) | 4J49 Fe-Ni-Cr |
|---|---|---|---|
Composition | 29% Ni, 17% Co, 54% Fe | 42% Ni, 58% Fe | 42% Ni, 5% Cr, 53% Fe |
CTE (ppm/°C, 20-400°C) | ~5.0 | ~4.0–4.7 (20-300°C) | ~5.5 |
Temperature Range | -50°C to 400°C | -40°C to 300°C | -50°C to 450°C |
Curie Temperature | ~435°C | ~370°C | ~390°C |
Yield Strength (MPa) | ~345 | ~310 | ~345 |
Tensile Strength (MPa) | ~520 | ~520 | ~550 |
Density (g/cm³) | 8.36 | 8.12 | 8.20 |
Applications | Vacuum tubes, microwave components | Semiconductor lead frames, seals | Semiconductor packaging, vacuum tubes |
Oxidation Resistance | Excellent | Good | Excellent |
Low Coefficient of Thermal Expansion (CTE): The primary feature of Kovar alloy is its low CTE, which ensures stable dimensional integrity despite temperature fluctuations.
High Strength and Toughness: Provides superior strength while maintaining flexibility, making it suitable for a variety of precision applications.
Outstanding Corrosion Resistance: Exhibits excellent resistance to corrosive environments, ensuring long-term performance in harsh conditions.
Thermal Stability: Maintains its properties even under high-temperature conditions, ideal for aerospace and electronic applications.
Uniform Structure: Manufactured to exacting specifications, ensuring consistent quality and reliability across the wire.


The Kovar 4J29 precision alloy wire is utilized across a wide range of industries due to its impressive thermal stability, mechanical strength, and versatility:
Aerospace Industry: Kovar alloy wire is used in aerospace applications for wiring systems and components that require precise control and durability in extreme temperature conditions.
Electronics Industry: Essential for electrical connections and precision sensors, this alloy wire is used in semiconductor manufacturing, electronics components, and other critical applications requiring high reliability.
Medical Technology: The alloy’s resistance to heat and corrosion makes it ideal for use in medical devices, ensuring long-lasting performance in medical equipment and sensors.

The manufacturing process for Kovar 4J29 alloy wire involves several key steps to ensure its superior performance:
Melting and Alloying: The nickel-iron alloy is carefully blended and melted at high temperatures to achieve the desired properties, ensuring excellent tensile strength and uniformity.
Wire Drawing: The molten alloy is then drawn into fine wires through a controlled process, ensuring a consistent diameter and structure.
Heat Treatment: The wire undergoes heat treatment to enhance its mechanical properties, including strength, flexibility, and thermal resistance.
Quality Control: Rigorous testing and inspection are performed at various stages to guarantee that the wire meets the required standards for dimensional accuracy, strength, and resistance.

High Strength and Flexibility: Kovar 4J29 offers both tensile strength and flexibility, making it ideal for precision applications that require intricate wire designs.
Excellent Durability: The alloy’s outstanding resistance to corrosion, heat, and wear ensures it performs reliably in harsh environments, including high-temperature aerospace applications.
Versatile Applications: From aerospace to medical technology, Kovar 4J29 alloy wire is used across diverse industries for a variety of high-performance applications.
ISO Certified: Manufactured to international standards, ensuring the alloy wire is of the highest quality and consistency.



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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What is your working time and contact information?
Our office hours are Monday to Saturday, 7:30 AM to 5:00 PM (Beijing Time, GMT+08:00). We observe public holidays from May 1st to 3rd, October 1st to 7th, and during Chinese New Year. Please feel free to email us during these holidays if you have any inquiries.
Do you provide free samples?
Yes, we can provide free samples of Kovar 4J29 alloy wire for testing purposes. However, buyers are responsible for covering the shipping costs.
What are your payment terms?
We accept various payment methods, including T/T, L/C, D/A, D/P, Western Union, MoneyGram, and PayPal.
What is the lead time?
The typical lead time for samples is approximately 7 days after payment confirmation.
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