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 Strip
Product Details

Discover the stock of Invar Kovar 4J29 and 4J44 precision alloy expansion strips, a high-performance product designed for a range of industrial applications. These precision alloy strips offer exceptional thermal stability, making them ideal for industries where dimensional stability is crucial.
Key Features of 4J29, 4J44 Precision Expansion Alloy Strips
The 4J29 and 4J44 expansion alloy strips are crafted from premium materials, offering reliable and durable solutions for your specific needs. Their key features include:
Low Coefficient of Thermal Expansion (CTE): Both 4J29 and 4J44 alloys exhibit a very low CTE, which helps to maintain dimensional integrity under fluctuating temperature conditions.
Excellent Thermal Stability: These alloys maintain their properties even under extreme thermal stresses, ensuring that your components remain reliable over time.
Versatility in Processing: The strips can be easily cut, bent, and shaped to meet precise requirements for different applications.
These alloys are particularly beneficial in applications where thermal expansion needs to be minimized and dimensional accuracy is essential.


Parameter | 4J44 Precision Alloy | 4J43 Fe-Ni-Co | Kovar |
|---|---|---|---|
Composition | 40% Ni, 14% Co, 46% Fe | 42% Ni, 15% Co, 43% Fe | 29% Ni, 17% Co, 54% Fe |
CTE (ppm/°C, 20-500°C) | ~5.0 | ~5.2 | ~5.0 |
Temperature Range | -50°C to 500°C | -50°C to 500°C | -50°C to 400°C |
Curie Temperature | ~415°C | ~420°C | ~435°C |
Yield Strength (MPa) | ~355 | ~360 | ~345 |
Tensile Strength (MPa) | ~550 | ~560 | ~520 |
Density (g/cm³) | 8.22 | 8.25 | 8.36 |
Applications | Sensors, pressure transducers | Aerospace sensors, satellite parts | Glass-to-metal seals, electronics |
Oxidation Resistance | Excellent | Excellent | Excellent |
Application Fields of 4J29, 4J44 Precision Alloy Strips
The 4J29 and 4J44 expansion alloy strips are commonly used across a wide range of industries, including:
Electronics: They provide the thermal stability necessary for precise electronic components.
Aerospace: With their low expansion properties, these alloys are perfect for aerospace applications where material performance under extreme temperatures is crucial.
Telecommunications: Their durability ensures that telecommunications components can withstand temperature variations without deforming.
Optical Instruments: These alloys are used in instruments that require stable dimensions to maintain high-performance accuracy.

Manufacturing Process of 4J29, 4J44 Precision Alloy Strips
Our precision alloy strips undergo a meticulous manufacturing process to ensure superior quality. The steps include:
Alloying: Combining the base metals in precise proportions to achieve the desired thermal expansion properties.
Processing: The alloys are rolled, drawn, or heat-treated to create strips with precise dimensions and a smooth surface finish.
Quality Control: Each batch undergoes stringent testing for mechanical properties, surface finish, and dimensional accuracy to ensure consistency and reliability.
These steps guarantee that every strip is capable of meeting the high demands of industrial applications.

Advantages of Using 4J29, 4J44 Precision Expansion Alloy Strips
The 4J29 and 4J44 precision alloy strips offer several key advantages:
Superior Dimensional Stability: Their low thermal expansion minimizes the risk of deformation due to temperature changes.
Enhanced Durability: These alloys are highly resistant to wear and thermal fatigue, making them ideal for long-term use in harsh environments.
Customizable: The strips can be easily tailored to specific sizes and shapes, offering flexibility for a wide range of applications.
These alloys are designed to perform reliably under both high and low temperatures, ensuring your components maintain their integrity throughout their lifecycle.
Packaging & Shipping
We offer efficient and secure packaging and shipping options to ensure that your 4J29 and 4J44 precision alloy strips arrive in perfect condition. Our packaging is designed to protect the material during transport, and we work with trusted shipping partners to ensure timely delivery.



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.

Client Visits
Building Stronger Partnerships


FAQ
What is your working time and contact information?
We are available from Monday to Saturday, 7:30 AM to 5:00 PM (Beijing time, GMT+08:00). We observe public holidays during May 1-3, October 1-7, and the Chinese New Year holiday. Please feel free to email us during these periods for any queries.
Do you provide free samples?
Yes, we offer free samples for testing. However, the buyer is responsible for 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 for orders?
The sample lead time is typically 7 days after payment confirmation. Bulk orders may take longer depending on quantity and customization requirements.
Previous article:High Quality 4J29 Kovar Precision Alloy Tube Factory Direct Price