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Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Copper Nickel Alloy Tubes

Copper Nickel Alloy Tubes

-- Steady & Reliable Manufacturer --

Engineered for Harsh Marine and Industrial Environments

Copper Nickel (CuNi) alloy tubes, often referred to as Cupronickel, are the ultimate solution for applications involving high-salinity water, corrosive industrial fluids, and extreme thermal stress. At Zhejiang Jingliang, we specialize in the two most prominent grades: C70600 (90/10) and C71500 (70/30). By adding nickel and iron to the copper base, these alloys develop a protective, adherent surface layer that is remarkably resistant to erosion, pitting, and stress corrosion cracking. This makes them the standard for marine engineering, offshore oil and gas, and desalination plants. Our CuNi tubes are manufactured using vacuum induction melting to ensure a precise chemical balance, which is critical for maintaining the alloy's integrity in high-velocity seawater environments. These tubes are not just pipes; they are high-performance metallurgical barriers against the most aggressive elements found in nature.

The manufacturing of CuNi tubing requires specialized expertise in "Work Hardening" and "Annealing Cycles" to ensure the material remains ductile enough for installation while retaining its high tensile strength. One of the unique properties of our Copper Nickel tubes is their natural resistance to biofouling—the growth of barnacles, algae, and other marine organisms on the pipe surface. This bio-resistance is vital for maintaining the efficiency of heat exchangers and condensers on ships and offshore platforms, where fouling can lead to overheating and system failure. At Jingliang, we utilize advanced eddy-current testing and ultrasonic inspection to ensure that every millimeter of our alloy tubing is free from internal flaws, providing the reliability required for systems where maintenance is difficult and downtime is incredibly expensive.

Metallurgical & Mechanical Specs

Property90/10 CuNi (C70600)70/30 CuNi (C71500)
Nickel Content9.0% - 11.0%29.0% - 33.0%
Iron Content1.0% - 1.8% (for erosion resist)0.4% - 1.0%
Tensile Strength≥ 275 MPa≥ 360 MPa
Yield Strength≥ 105 MPa≥ 125 MPa
Thermal Conductivity45 W/(m·K)29 W/(m·K)
Corrosion Rate< 0.05 mm/year in seawater< 0.02 mm/year in seawater
Standard ComplianceASTM B111, ASME SB111, DIN 86019ASTM B111, MIL-T-16420K
Typical OD Range6mm - 419mm6mm - 219mm

Applications in Marine and Chemical Industries

Copper Nickel alloy tubes are most commonly found in Marine Heat Exchangers and Condensers on naval vessels and commercial ships. They are the primary material for Seawater Piping Systems, including fire mains, bilge systems, and cooling loops. In the Energy sector, they are used in Desalination Plants (MSF and MED processes) to handle high-temperature brine. The Offshore Oil and Gas industry utilizes CuNi for splash-zone protection and hydraulic control lines. In industrial settings, they are used in Chemical Processing Plants for the transport of mildly acidic or alkaline fluids. They also find application in the Automotive industry for high-end brake lines and fuel systems where salt-spray resistance is a priority. Additionally, because of their aesthetic "silver-copper" finish and durability, they are occasionally used in architectural elements for coastal luxury buildings.

Unrivaled Durability and Anti-Fouling Benefits

The primary advantage of CuNi tubes is their "Superior Corrosion Resistance" in seawater; the nickel content ensures that the pipe does not suffer from the thinning or pitting that destroys standard copper or steel. "Biofouling Resistance" is another critical advantage, as it eliminates the need for toxic anti-fouling coatings and reduces the frequency of system cleaning. Our CuNi alloys offer "High Erosion Resistance," allowing them to handle the high-velocity flow rates (up to 3.5 m/s for 90/10) required in modern condenser designs. They also possess "Excellent Weldability" and "Ductility," making them easier to install in the tight confines of a ship’s engine room compared to stainless steel. Furthermore, the "Thermal Stability" of these alloys ensures they maintain their mechanical properties across a wide temperature range, from cryogenic levels to the heat of a high-pressure steam condenser. Finally, the "Long-Term Cost-Effectiveness" is significant; while the initial material cost is higher, the massive reduction in maintenance and replacement costs makes CuNi the most economical choice for marine environments.

Global Export for Marine Projects

Due to the high weight and value of Copper Nickel, we use reinforced wooden crates and specialized moisture-proof barriers for all international shipments. Payment is typically via T/T (30/70) or L/C. We are experts in providing the rigorous documentation required for the marine industry, including Mill Test Certificates to EN 10204 3.1 and optional third-party inspections by DNV, ABS, or Lloyd's Register. We ship globally from Ningbo and Shanghai, providing JIT delivery for shipyards and offshore construction projects. Our logistics team handles the complex customs requirements for high-value alloys, ensuring that your project stays on schedule. We also offer specialized "Long-Length" tubing (up to 12 meters) for large-scale industrial heat exchangers to minimize the number of tube-sheet joints.

  • Q: Which is better, 90/10 or 70/30 CuNi?
  • A: 90/10 is the standard for general seawater piping due to its cost-efficiency and excellent performance. 70/30 is preferred for higher velocities, higher temperatures, and more aggressive conditions found in certain condensers.
  • Q: Can CuNi be used in freshwater?
  • A: Yes, it is excellent for freshwater, but it is generally reserved for environments where standard copper might fail due to specific corrosive agents or high flow rates.
ABOUT US
30+YEARS OF
EXPERIENCE
About Us

A Reliable Partner of the Copper Tube Industry

Zhejiang Jingliang Copper-Tube Products Co., Ltd is China Copper Nickel Alloy Tubes and Copper Nickel Alloy Tubes Factory, which established in 1994, has been deeply involved in the copper tube industry for over three decades. The company primarily produce various specifications of products such as copper tubes, brass tubes, copper square tubes, fin copper tubes, copper capillary tubes, condenser copper tubes, copper evaporator tubes, and conductive rods, which are of quality and have earned the trust and acclaim of customers both domestically and internationally.

Wide Applications:

These products are widely used in various fields including air conditioning, refrigeration, heat exchange, sanitary ware, automotive, machinery, electric furnaces, and chemical industries.

Convenient Transportation:

Strategically located in Tangpu Town, renowned as the “home of copper tubes” in East China. Our company enjoys a prime location, adjacent to the Shangsan Expressway and National Highway 104, and is conveniently situated just over 70 kilometers from Hangzhou and Ningbo, ensuring easy accessibility and a business position.

Strong Financial Resources:

With its strong financial resources and advanced copper tube processing technology, our company holds an advantageous position in market share, brand value, technological content, and product quality, becoming a preferred supplier for many listed groups.

Large Scale Production:

The company occupies an area of over 20,000 square meters, with a construction area of 12,800 square meters. In 2022, our annual production exceeded 7,500 tons, with a value output of up to 450 million yuan, demonstrating our strong production capacity and market competitiveness.

Comprehensive Industry Chain:

Jingliang has now developed into a complete industrial chain integrating smelting, extrusion, drawing, precision rolling, and annealing. It has been awarded multiple honors, including "Top Ten Copper Tube Enterprises" and "Leading Taxpayer in the Copper Tube Industry".

Smart Manufacturing:

Jingliang Copper-Tube Products will better integrate the concept of factory construction into its corporate development strategy, insist on refining technology and polishing products more finely, and the future of "intelligent manufacturing".

Genuine Cooperation:

Zhejiang Jingliang Copper-Tube Products Co.,Ltd warmly welcomes friends from all walks of life to visit and offer guidance. We look forward to joining hands with you to create a brilliant future together.

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