ASTM B111 C71640 Copper Nickel Alloy Tube | EN CW353H Seawater Condenser Alloy tube
ASTM B111 C71640 copper nickel alloy tube is a seamless CuNi tube specifically designed for seawater condenser and marine heat exchanger applications. With excellent resistance to seawater corrosion, biofouling, and erosion-corrosion, C71640 copper nickel tubes are widely used in power plants, desalination facilities, offshore platforms, and shipbuilding industries.
We are a professional manufacturer and exporter of ASTM B111 C71640 seamless copper nickel alloy tubes, supplying high-quality condenser tubes with full certification and global delivery.
What Is ASTM B111 C71640?
ASTM B111 is the standard specification for seamless copper and copper alloy tubes for condensers and heat exchangers.
Grade C71640 (CuNi 70/30) contains approximately:
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Small additions of Iron and Manganese
This composition provides excellent resistance to seawater corrosion and high mechanical strength compared to CuNi 90/10 alloys.
Equivalent Standards
| Standard | Grade |
|---|---|
| ASTM | B111 C71640 |
| UNS | C71640 |
| EN | CW353H |
Chemical Composition of C71640 (%)
| Element | Composition (%) |
| Copper (Cu) | Balance |
| Nickel (Ni) | 29.0 – 32.0 |
| Iron (Fe) | 1.7 – 2.3 |
| Manganese (Mn) | 1.5 – 2.5 |
| Lead (Pb) | 0.05 max |
| Zinc (Zn) | 1.0 max |
| Other Elements | C: 0.05 max; S: 0.02 max; O: 0.06 max |
Mechanical Properties (Typical)
| Temper | Tensile Strength (ksi) | Yield Strength (ksi) | Elongation (%) |
| O61 (Annealed) | 63 | 25 | – |
| HR50 (Drawn & Stress Relieved) | 81 | 58 | – |
Why Choose C71640 for Seawater Condensers?
✔ Excellent resistance to seawater corrosion
✔ High resistance to biofouling
✔ Strong erosion-corrosion resistance
✔ Long service life in marine environments
✔ Suitable for high-velocity seawater systems
✔ Good weldability and fabrication properties
C71640 copper nickel alloy tubes are ideal for condenser tubes operating under aggressive seawater conditions.
Manufacturing & Delivery Condition
Product Type: Seamless copper nickel alloy tube
Manufacturing Process: Cold drawn / Annealed
Delivery Condition: Soft annealed or light drawn
Surface: Cleaned and degreased
All tubes are manufactured in accordance with ASTM B111 dimensional tolerances.
Size Range
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Outside Diameter: 6 mm – 120 mm
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Wall Thickness: 0.5 mm – 6 mm
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Length: Up to 12 meters
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Cut-to-length and U-bend available
Custom sizes available upon request.
Inspection & Testing
All ASTM B111 C71640 tubes undergo strict quality control:
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Chemical composition analysis
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Mechanical testing
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Eddy current testing
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Hydrostatic testing
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Dimensional inspection
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Visual inspection
Certification:
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EN 10204 3.1
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Third-party inspection available (BV, SGS, DNV)
Applications of ASTM B111 C71640 Copper Nickel Tubes
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Seawater condensers
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Power plant heat exchangers
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Desalination plants
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Offshore oil & gas platforms
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Marine cooling systems
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Shipbuilding
C71640 seamless copper nickel tubes are trusted for critical cooling and heat transfer systems.
CuNi 70/30 vs CuNi 90/10
| Property | 70/30 (C71640) | 90/10 (C70600) |
|---|---|---|
| Strength | Higher | Lower |
| Seawater Resistance | Excellent | Very good |
| High Velocity Service | Better | Moderate |
For severe seawater environments, CuNi 70/30 is the preferred choice.
Why Choose Our C71640 Copper Nickel Tubes?
✔ Strict ASTM B111 compliance
✔ Large stock availability
✔ Competitive factory pricing
✔ Fast global shipping
✔ 15+ years export experience
✔ Marine and power plant project supply
