Description
🌊 Seamless Cupronickel 70/30 Pipe – ASTM B466 C71500 Tubing
Seamless Cupronickel 70/30 Pipe is one of the most reliable and high-performance materials in today’s marine and industrial piping markets. Manufactured from C71500 copper-nickel alloy, this seamless tubing complies with ASTM B466 standards and is specifically engineered to resist seawater corrosion, thermal stress, and mechanical fatigue in harsh environments.
Whether used in shipbuilding, desalination plants, or heat exchanger systems, our Seamless Cupronickel 70/30 Pipe offers the durability and precision you need.
🧪 Technical Specifications
| Property | Specification |
|---|---|
| Standard | ASTM B466 / ASME SB466 |
| Material | Cu-Ni 70/30 (C71500) |
| Form | Seamless pipe / tubing |
| Outer Diameter | 6 mm – 219 mm (Custom sizes available) |
| Wall Thickness | 0.5 mm – 10 mm |
| Length | Up to 6 meters or custom |
| Temper | Annealed (O60), Half-Hard (H55), Hard (H80) |
Each Seamless Cupronickel 70/30 Pipe is cold-drawn and annealed to ensure superior dimensional stability and internal smoothness, enabling it to meet stringent engineering demands.
⚙️ Chemical Composition (C71500)
| Element | Content (%) |
|---|---|
| Copper (Cu) | 69.0 – 71.0 |
| Nickel (Ni) | 29.0 – 33.0 |
| Iron (Fe) | 0.4 – 1.0 |
| Manganese | ≤ 1.0 |
| Zinc (Zn) | ≤ 1.0 |
This optimized composition enhances the Seamless Cupronickel 70/30 Pipe’s ability to withstand aggressive chlorinated seawater and high-pressure operating environments.
💡 Key Features & Benefits
✅ Exceptional Corrosion Resistance
Especially effective against seawater and brine environments, C71500 outperforms stainless steel in marine conditions.
✅ High Thermal Conductivity
Ensures efficient heat transfer in condensers and heat exchangers.
✅ Low Biofouling Tendencies
Reduces marine growth, cutting maintenance costs for offshore applications.
✅ Durability at High Flow Velocities
No erosion even at high seawater flow rates (>4 m/s), maintaining long-term integrity.
✅ Excellent Weldability & Fabricability
The Seamless Cupronickel 70/30 Pipe can be easily welded using standard Cu-Ni fillers.
✅ Long Service Life
With proper installation, the operational lifespan can exceed 25 years in seawater systems.
🌍 Applications of Seamless Cupronickel 70/30 Pipe
🔧 Marine Industry
Used in shipbuilding for seawater cooling lines, fire suppression, ballast systems, and bilge lines.
🌡 Heat Exchangers & Condensers
Optimized for HVAC systems, steam condensers, and energy recovery units.
🏗 Desalination Plants
Highly resistant to scaling and pitting caused by brine and chlorinated seawater.
🏭 Chemical Processing
Resists corrosion by a wide range of acids and organic solvents.
⚡ Power Generation
Supports heat transfer in nuclear and thermal power plants.
🛠 Manufacturing Process
Our Seamless Cupronickel 70/30 Pipe is produced using precision-controlled extrusion and cold drawing, followed by annealing. This ensures uniform grain structure, high dimensional precision, and exceptional mechanical performance.
🧪 Testing & Quality Control Includes:
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Hydrostatic Pressure Test
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Eddy Current Inspection
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Ultrasonic Flaw Detection
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Grain Size Evaluation
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Flattening and Flaring Tests
All pipes are traceable with heat numbers and are supplied with a Mill Test Certificate (MTC 3.1 or 3.2) as per EN 10204.
🧰 Customization Options
We support fully tailored configurations of Seamless Cupronickel 70/30 Pipe, including:
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OD / ID and wall thickness
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Special lengths (pre-cut)
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End types: plain, beveled, threaded
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Surface finishing: bright annealed / pickled
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Bending, flanging, and welding support
Need CNC-machined fittings or elbows in matching Cu-Ni alloy? Contact our engineering team for integrated solutions.
📦 Packaging & Export Logistics
📦 Packaging Options:
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Plastic end caps
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Bundled with steel strips
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Export-grade wooden crates (ISPM-15)
🚢 Delivery Options:
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EXW, FOB, CIF, DDP available
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Global export experience across 30+ countries
🛃 All our exports comply with Chinese customs and international trade regulations. We also assist in applying for End-Use Certificates for controlled-use shipments.
🧾 Certifications & Standards
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ASTM B466 / ASME SB466
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ISO 9001:2015 Quality Management
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SGS / BV inspection available
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DNV / ABS marine approval upon request
These certifications ensure our Seamless Cupronickel 70/30 Pipe meets strict international compliance for naval, offshore, and industrial use.
🔄 Compared to Cupronickel 90/10 Pipes
| Property | 70/30 Alloy (C71500) | 90/10 Alloy (C70600) |
|---|---|---|
| Nickel Content | ~30% | ~10% |
| Corrosion Resistance | Excellent | Good |
| Mechanical Strength | Higher | Moderate |
| Cost | Slightly Higher | Lower |
For higher flow velocity or aggressive chloride environments, 70/30 is the preferred choice due to its improved durability.
🌐 Technical References
📖 Copper-Nickel 70/30 – AZoMaterials
📞 Contact Us
📧 Email: sales@niticu.com
📞 Phone / WhatsApp / WeChat: +86 13335373172
🏭 Factory Address: Baotai Road Industrial Park, High-tech Zone, Baoji City, Shaanxi, China
🌐 Website: https://niticu.com
📩 Contact us now for pricing, technical consultation, and samples — we respond within 24 hours.
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