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Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Cupro-Nickel 70/30

Cupro-Nickel 70/30

-- Steady & Reliable Manufacturer --

The High-Strength Solution for Extreme Marine Environments

Cupro-Nickel 70/30, or C71500, is the "heavy-duty" sibling of the 90/10 alloy. By increasing the nickel content to 30%, this alloy achieves significantly higher mechanical strength and even greater resistance to high-velocity seawater erosion. At Zhejiang Jingliang, our 70/30 CuNi is engineered for the most aggressive industrial environments, such as "High-Pressure Condensers" and "High-Temperature Brine Heaters" in desalination plants. The higher nickel content makes the alloy more "Noble," meaning it has an even lower corrosion rate in high-temperature seawater and is more resistant to "Sand Erosion"—a critical factor for desalination intakes in desert regions. While it is more expensive than 90/10 due to the nickel content, its "Toughness" makes it the preferred choice for nuclear submarines and high-speed naval vessels where failure is not an option.

Our C71500 pipes undergo "Homogenizing Heat Treatment" to ensure the alloying elements are perfectly dispersed. This prevents localized "Galvanic Cells" from forming within the metal, which could lead to pitting. In high-velocity fluid systems, 70/30 can safely handle velocities up to 4.5 meters per second (m/s), whereas 90/10 is typically capped at 3.5 m/s. This allows for even more "Compact Heat Exchanger Designs." Despite its increased hardness, Jingliang's 70/30 maintains excellent "Cold-Workability," allowing for the tight "U-Bends" required in modern boiler and condenser architectures. When the mission requires the absolute maximum in corrosion resistance, strength, and thermal stability under the harshest marine conditions, C71500 is the ultimate material choice.

Mechanical Strength & Velocity Specs

PropertyC71500 (CuNi 70/30) Specs
Nickel Content29.0% - 33.0%
Iron Content0.4% - 1.0%
Copper ContentRemainder (Approx. 68%)
Tensile Strength≥ 360 MPa (Soft), ≥ 485 MPa (Hard)
Yield Strength≥ 140 MPa
Thermal Conductivity29 W/(m·K)
Max Velocity (Seawater)4.5 m/s (15 ft/s)
Elastic Modulus152 GPa
Density8.94 g/cm³
StandardASTM B111 / BS 2871 / MIL-T-16420

Nuclear Naval Vessels, Brine Heaters, and Steam Condensers

Cupro-Nickel 70/30 is the "Standard for Nuclear Navy" cooling systems, used for critical piping in submarines and aircraft carriers. In "Desalination Plants," it is used for the "Brine Heaters" where the temperatures and concentrations of salt are at their highest. It is essential in "High-Pressure Steam Condensers" for power generation, where it resists the erosion caused by steam impingement. In the "Oil and Gas" industry, it is used for "Process Coolers" that handle aggressive chemicals alongside seawater. It is also found in "Heavy-Duty Hydraulic Lines" in marine environments where salt-air corrosion would destroy steel. Additionally, it is used for "Cryogenic Applications" due to its excellent mechanical properties at sub-zero temperatures, and in "Chemical Processing" for handling organic acids and non-oxidizing mineral acids.

Maximum Erosion Resistance and High-Pressure Reliability

The primary advantage is "Superior Erosion-Corrosion Resistance," allowing the system to operate at "Higher Fluid Velocities" which reduces the overall size and weight of heat exchangers. Our 70/30 CuNi offers "Enhanced Mechanical Strength," providing a "Higher Factor of Safety" for high-pressure industrial systems. The alloy’s "Excellent High-Temperature Stability" ensures that it remains structurally sound in brine heaters operating at 100°C+. Our pipes provide "Unmatched Resistance to Stress Corrosion," outperforming most stainless steels in hot chloride environments. The "Mirror-Smooth Internal Draw" of our tubes "Minimizes Scaling and Fouling," which significantly "Reduces Maintenance Downtime." Furthermore, the "Excellent Welding Characteristics" allow for high-integrity joints using TIG or MIG processes. Finally, the "Longevity" of C71500 ensures that the "Total Cost of Ownership" is the lowest in the industry, as the piping system will often outlast the machinery it serves.

Industrial Strength Packaging and QA Documentation

Given the high nickel value, these pipes are shipped in "Steel-Reinforced Wooden Cases." Each pipe is individually bagged to maintain surface purity. Payment is 30% T/T and 70% L/C. We ship from the Port of Ningbo, providing "Full Traceability Certificates" and "Eddy Current Testing" results for 100% of the tubes. For naval and nuclear projects, we offer "Third-Party Inspection" (TPI) coordination with organizations like DNV, ABS, or Lloyd’s Register to verify every quality parameter before the shipment leaves our facility.

  • Q: Why is 70/30 preferred over 90/10 for nuclear applications?
  • A: The 70/30 alloy has much higher yield strength and a higher safety margin against erosion, which is critical in "Failure-Is-Not-An-Option" environments like nuclear cooling.
  • Q: Is 70/30 CuNi resistant to ammonia?
  • A: While much better than standard brass, all copper-based alloys have limitations with high concentrations of ammonia. We recommend specific testing for ammonia-rich chemical processes.
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 Cupro-Nickel 70/30 and Cupro-Nickel 70/30 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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