Shanghai, China – July 23, 2025 — Chinese manufacturers are continuing to strengthen their position in the global copper market with the production and export of high-quality CUNI 70/30 Copper Pipes, especially those conforming to the ASTM B171 standard. Among the top-performing products is the 1-inch diameter, 2.5mm wall thickness, 6-meter-long CUNI 70/30 copper pipe, pressure-rated at 16 Bar, which has become a top choice for applications in marine engineering, desalination plants, HVAC systems, and heat exchangers.
What is CUNI 70/30?
CUNI 70/30 is a copper-nickel alloy composed of 70% copper and 30% nickel, with small additions of iron and manganese to enhance its strength and corrosion resistance. This alloy is particularly valued for its excellent resistance to seawater corrosion, biofouling, and stress corrosion cracking—making it ideal for high-performance and long-lasting piping systems in harsh environments.
Product Overview
The featured CUNI 70/30 copper pipe boasts a nominal diameter of 1 inch, a wall thickness of 2.5mm, and a length of 6 meters, offering a balance of strength, workability, and durability. With a pressure rating of 16 Bar, it is suitable for medium-pressure fluid transmission systems. The pipe conforms to the internationally recognized ASTM B171 standard, ensuring precise material composition, mechanical properties, and dimensional accuracy.
Applications in Key Industries
1. Marine Engineering
In the marine industry, where components are constantly exposed to seawater and high-pressure conditions, the reliability of piping systems is crucial. The CUNI 70/30 pipe’s resistance to corrosion and erosion in seawater makes it an ideal material for shipbuilding, offshore oil platforms, and submarine piping.
2. Desalination Plants
As freshwater scarcity increases globally, desalination has become essential. CUNI 70/30 pipes are widely used in multi-stage flash (MSF) and reverse osmosis (RO) desalination plants, particularly in heat exchangers, intake systems, and discharge lines where both temperature and salinity are high.
3. HVAC & Refrigeration Systems
Thanks to its thermal conductivity and anti-corrosive properties, the pipe is also suitable for air conditioning systems and refrigeration units. Its 6-meter length minimizes the need for joints, reducing the risk of leakage and improving efficiency.
4. Power Generation and Industrial Heat Exchangers
In power plants, especially those located in coastal areas, the CUNI 70/30 pipe is commonly used in steam condensers and cooling water systems. Its ability to withstand biofouling and scaling gives it a longer operational lifespan compared to alternative materials.
Why Global Buyers Prefer Chinese Manufacturers
Chinese suppliers have become key players in the copper-nickel market due to their ability to deliver high-quality products at competitive prices. With advanced production lines, strict quality control systems, and international certifications, China-based factories are well-equipped to meet the growing global demand for CUNI 70/30 pipes.
One leading manufacturer from Shanghai commented, “We’ve invested heavily in metallurgy, testing equipment, and automated production to ensure every pipe meets ASTM B171 requirements. We supply large quantities to Southeast Asia, the Middle East, and Europe every year.”
Key Product Features
Material: CUNI 70/30 (70% Copper, 30% Nickel)
Standard: ASTM B171
Outer Diameter: 1 inch (25.4 mm)
Wall Thickness: 2.5 mm
Length: 6 meters (customizable)
Pressure Rating: 16 Bar
Surface Finish: Smooth, corrosion-resistant
End Type: Plain or beveled
Certifications & Testing
To ensure reliability and performance, CUNI 70/30 pipes undergo various inspections, including:
Hydrostatic pressure testing
Eddy current and ultrasonic tests
Spectrochemical analysis
Mechanical property testing (yield strength, tensile strength, elongation)
Certified by ISO 9001, TUV, and BV, many factories also offer third-party inspection to accommodate buyer requirements.
Packaging & Shipping
Each pipe is cleaned, capped, and bundled with protective materials to prevent surface damage during transit. Export packaging usually consists of wooden cases or pallets, with each unit labeled according to customer specifications. With efficient logistics support, orders are shipped globally by sea, air, or rail.
Conclusion
As industries worldwide search for materials that deliver durability, corrosion resistance, and efficiency, CUNI 70/30 copper pipes have cemented their reputation as a reliable choice. The 1-inch, 2.5mm thick, 6-meter-long pipe produced under ASTM B171 guidelines is a prime example of how Chinese manufacturers are raising the bar in metal piping solutions.
With innovation, quality control, and global outreach, China’s copper pipe industry is poised to play an even bigger role in the future of industrial infrastructure.