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
Product Details

3J21 Precision Alloy Tube s are high-performance materials made from a cobalt-chromium-nickel alloy, known for their outstanding strength, corrosion resistance, and heat tolerance. These tubes are ideal for demanding industrial applications where durability and reliability are crucial. Available at affordable prices per kg, the 3J21 alloy tubes offer excellent value for industries that require superior material performance under extreme conditions.
Key Features of 3J21 Precision Alloy Tubes
High Strength: 3J21 precision alloy tubes provide exceptional tensile strength, making them suitable for heavy-duty applications.
Corrosion Resistance: The alloy’s composition, rich in cobalt, chromium, and nickel, ensures excellent resistance to corrosion, oxidation, and wear.
Heat Resistance: These tubes maintain their mechanical properties even under high temperatures, making them ideal for applications in heat-intensive environments.
Versatility: Available in a variety of sizes and forms, these tubes can be customized to meet specific industrial needs.


Comparison Parameter Table
| Grades | Density (g/cm³) | Electrical Resistivity (10⁻⁶ Ω·cm) | Thermal Conductivity (W/m·K) | Modulus of Elasticity (GPa) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation at Break (%) | Elastic Limit (MPa) | Fatigue Life (cycles) | Working Temperature Range (°C) | Temperature Coefficient |
| 8.1 | 80 | 11 | 144 | 800 | 1000 | 10 | 800 | >10⁷ | -60 to 200 | Extremely low temperature coefficient of elasticity | |
| 8.3 | 120 | 40 | 125 | 300 | 600 | 20 | 300 | >10⁷ | -40 to 150 | Elasticity remains constant with minimal temperature sensitivity | |
| 8.2 | 100 | 15 | 180 | 1100 | 1400 | 5 | 1100 | >10⁶ | -200 to 500 | Maintains high strength even at elevated temperatures |
Applications of 3J21 Precision Alloy Tubes
3J21 precision alloy tubes are widely used in several industries where high strength, corrosion resistance, and heat tolerance are critical. Some of the key application fields include:
Aerospace Industry: The alloy’s high strength-to-weight ratio and ability to withstand extreme temperatures make it ideal for use in aircraft components, including structural elements and engine parts.
Medical Devices: 3J21 alloy tubes are used in medical instruments and implants due to their biocompatibility and ability to resist corrosion in bodily environments.
Oil and Gas: These tubes are well-suited for the oil and gas industry, especially for use in deep-sea exploration, offshore drilling equipment, and high-pressure systems.
Electronics: 3J21 precision alloy tubes are used in electronic devices that require long-term durability and performance in harsh conditions.

The production of 3J21 precision alloy tubes involves a precise and controlled process to ensure high-quality results. The alloy is created by combining cobalt, chromium, and nickel in exact proportions to achieve the desired mechanical, thermal, and corrosion-resistant properties. The process includes:
Material Composition: The primary elements—cobalt, chromium, and nickel—are combined to produce an alloy with high strength, corrosion resistance, and heat tolerance.
Shaping and Processing: After casting, the material is subjected to processes such as extrusion, drawing, and heat treatment to form it into tubes. This ensures that the tubes retain their strength and performance characteristics.

Exceptional Durability: 3J21 precision alloy tubes offer long-lasting durability with resistance to wear, corrosion, and oxidation, even in the harshest conditions.
Superior Heat Resistance: These tubes maintain their mechanical properties even in high-temperature environments, making them perfect for applications that require heat resistance.
Cost-Effective: Despite their excellent performance, 3J21 precision alloy tubes are available at affordable prices per kg, offering superior value for industries requiring high-performance materials.
Customizable Forms: Available in various sizes and shapes, 3J21 alloy tubes can be customized to meet the specific needs of different industrial 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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Q: What is the brand name of this product?
A: The brand name of this product is DLX.
Q: What is the model number of this product?
A: The model number of this product is 3J21, a cobalt-chromium-nickel alloy tube.
Q: Where is this product manufactured?
A: This product is manufactured in Jiangsu, China.
Q: What are the dimensions of 3J21 alloy tubes?
A: The dimensions of 3J21 alloy tubes vary depending on the application and customer requirements. Please refer to the product specifications for more information.
Q: What is the composition of 3J21 alloy tubes?
A: 3J21 alloy tubes are made from a blend of cobalt, chromium, and nickel, providing high strength, corrosion resistance, and heat resistance.
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