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Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Copper Nickel (CuNi) Tube

Copper Nickel (CuNi) Tube

-- Steady & Reliable Manufacturer --

The Ultimate Defense Against Marine Corrosion

Copper-Nickel tubing, commonly known as Cupro-Nickel, is the gold standard for applications involving seawater and harsh saline environments. At Zhejiang Jingliang, we specialize in the two most prominent alloys: C70600 (90/10) and C71500 (70/30). While pure copper is excellent for fresh water, the addition of nickel and iron creates a material that is incredibly resistant to "Erosion Corrosion" and "Pitting" caused by high-velocity seawater. When exposed to the ocean, CuNi tubes develop a thin, adherent, and protective surface film that is uniquely hostile to marine organisms. This "Anti-Fouling" property prevents the buildup of barnacles and algae, which would otherwise restrict flow and reduce the heat transfer efficiency of the system. Our CuNi tubes are manufactured using a rigorous extrusion and drawing process that ensures a homogenous alloy structure, essential for preventing galvanic corrosion at the joints.

In the shipbuilding and offshore oil industries, the reliability of a piping system is a matter of safety. A failure in a cooling line or a fire-main while at sea can be catastrophic. That is why our Copper-Nickel tubes undergo 100% Eddy Current testing and hydrostatic testing to ensure zero defects. The C70600 alloy is favored for its excellent weldability and ductility, making it easy to install in the tight confines of a ship's engine room. The C71500 alloy, with its higher nickel content, is reserved for the most demanding environments, such as high-pressure condensers and desalination plants where temperatures and flow velocities are significantly higher. By choosing Jingliang's CuNi solutions, you are investing in a "fit and forget" material that can withstand the most aggressive environments on Earth for 30 years or more.

Alloy Composition & Mechanical Strengths

Property90/10 CuNi (C70600)70/30 CuNi (C71500)
Nickel Content9.0 - 11.0%29.0 - 33.0%
Iron Content1.0 - 1.8% (for erosion res.)0.4 - 1.0%
Tensile Strength≥ 275 MPa≥ 360 MPa
Yield Strength≥ 105 MPa≥ 125 MPa
Elongation (%)≥ 30%≥ 30%
Density8.94 g/cm³8.94 g/cm³
Thermal Conductivity45 W/(m·K)29 W/(m·K)
Max Seawater Velocity3.5 m/s4.5 m/s
StandardsASTM B111 / DIN 86019ASTM B111 / EEMUA 144

Seawater Cooling, Desalination, and Offshore Power

Copper-Nickel tubes are predominantly used in "Marine Engineering" for seawater cooling systems, bilge and ballast lines, and fire-fighting mains on commercial and naval vessels. They are the heart of "Desalination Plants," specifically in Multi-Stage Flash (MSF) evaporators, where they must resist boiling brine. In "Offshore Oil and Gas," they are used for splash-zone protection and hydraulic lines on rigs. The "Power Generation" industry uses CuNi for steam condensers and heat exchangers in coastal power plants where seawater is used as the cooling medium. They also find applications in "Brake Lines" for high-end automotive vehicles due to their resistance to road salt. Furthermore, their antimicrobial properties make them suitable for "Aquaculture" cage frames and intake pipes for fish farms, where preventing bio-growth is essential for water oxygenation.

Longevity in Saline Environments and Bio-Fouling Resistance

The primary advantage is "Superior Corrosion Resistance" in both stagnant and flowing seawater. Unlike stainless steel, which can suffer from crevice corrosion in the ocean, CuNi remains stable. The "Natural Bio-Fouling Resistance" is a massive operational benefit, as it "Reduces Maintenance Costs" by eliminating the need for chemical biocides or frequent mechanical cleaning. Our CuNi tubes offer "Excellent Thermal Stability," maintaining their strength even at elevated temperatures in heat exchangers. They possess "High Ductility and Weldability," allowing them to be fabricated into complex manifolds using standard TIG or MIG welding techniques. The "Erosion Resistance" of the 70/30 alloy allows for higher flow velocities, which means designers can use "Smaller Pipe Diameters" to achieve the same cooling capacity, saving weight and space on ships. Finally, the "Long Service Life" of 20 to 50 years makes CuNi the most "Cost-Effective" choice over the life of a maritime asset.

Heavy-Duty Export Logistics

CuNi tubes are heavy and valuable, so they are packed in seawater-resistant wooden crates with internal moisture barriers. Each bundle is interleaved with soft material to prevent surface scratches. Payment terms typically involve a 30% T/T deposit and 70% L/C or T/T against B/L. We ship from Ningbo, providing full traceability for marine grade materials, including "Third-Party Inspections" from bodies like ABS, DNV, or Lloyd's Register if required. Our logistics team ensures that all "Chemical Analysis" and "Mechanical Property" certificates are included with the shipping documents to facilitate smooth customs clearance and quality audits by shipyards.

  • Q: What is the difference between 90/10 and 70/30 CuNi?
  • A: 90/10 is more common and economical for general seawater piping. 70/30 is stronger and more resistant to high-velocity water and extreme temperatures, making it better for high-performance condensers.
  • Q: Do CuNi pipes require painting?
  • A: No, painting them would actually negate their natural anti-fouling properties. They are designed to be used in their bare state.
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 (CuNi) Tube and Copper Nickel (CuNi) Tube 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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