ASME SB111 UNS C71500 Copper Nickel Tube CuNi 70/30 Seamless Condenser Tube
ASTM B111 / ASME SB111 C71500 Copper Nickel Tube , CuNi30Mn1Fe Condenser Tube
Seamless tubes made from copper-nickel alloy UNS C71500 (CuNi90/10), composed of approximately 90% Copper (Cu) and 10% Nickel (Ni), often with small additions of Iron (Fe) and Manganese (Mn) for enhanced properties. as below:
1>. Exceptional Corrosion Resistance: Highly resistant to seawater, brackish water, brine, steam condensate, and various chemicals (acids, alkalis). Resists stress corrosion cracking, erosion-corrosion, and impingement attack.
2>. Biofouling Resistance: Naturally inhibits marine organism growth (barnacles, mussels, algae) better than many other alloys.
3>. Good Fabricability & Weldability: Can be formed, bent, brazed, soldered, and welded (using matching filler metals) relatively easily.
4>. Moderate Strength & Toughness: Higher strength and better ductility than pure copper or brass. Good fatigue strength.
5>. Thermal Conductivity: Lower than pure copper but significantly higher than carbon/stainless steels (beneficial for heat exchangers).
6>. Thermal Expansion: Coefficient similar to carbon steel, minimizing thermal stress issues when joined.
ASME SB111 UNS C71500 Copper Nickel Tube Chemical Composition
| Grade | C(Max) | Pb | Mn | P | S | Zn | Fe | Ni | Cu |
| C71500 | 0.05 | 0.02 | 1.0 | 0.02 | 0.02 | 0.50 | 0.4-1.0 | 29.0-33.0 | Balance |
ASME SB111 UNS C71500 Copper Nickel Tube Mechanical Properties
| Properties | Metric | Imperial |
| Tensile strength, ultimate | 372-517 MPa | 54000-75000 psi |
| Tensile strength, yield (depending on temper) | 88.0-483 MPa | 12800-70100 psi |
| Elongation at break (in 381 mm) | 45.0% | 45.0% |
| Charpy impact | 107 J | 78.9 ft-lb |
| Machinability (UNS C36000 (free-cutting brass) = 100%) | 20% | 20% |
| Shear modulus | 57.0 GPa | 8270 ksi |
| Poisson's ratio | 0.34 | 0.34 |
| Elastic modulus | 150 GPa | 21800 ksi |
| Material Designation | Corresponding Material Symbol | ||||
| GB/T8890 | ASTM B111 | BS2871 | JIS H3300 | DIN 1785 | |
| Copper-Nickel | BFe10-1-1 | C70600 Pipe | CN102 | C7060 | CuNi10Fe1Mn |
| BFe30-1-1 | C71500 Pipe | CN107 | C7150 | CuNi30Mn1Fe | |
| (BFe30-2-2) | C71640 | CN108 | C7164 | CuNi30Fe2Mn2 | |
| (BFe5-1.5-0.5) | C70400 | – | – | – | |
| B7 | – | – | – | – | |
| Aluminium Brass | HAL77-2 | C68700 Tube | CZ110 | C6870 | CuZn20Al2 |
| Admiralty Brass | HSn70-1 | C44300 Tube | CZ111 | C4430 | CuZn28Sn1 |
| Boric Brass | Hsn70-18 | – | – | – | – |
| HSn70-1 AB | – | – | – | – | |
| Arsenical Brass | H68A | – | CZ126 | – | – |
| Brass Tubes | H65/H63 | C28000/C27200 | CZ108 | C2800/C2700 | CuZn36/CuZn37 |
Applications
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Marine & Offshore: Condenser & heat exchanger tubes, seawater piping systems (pumps, valves, fittings), desalination plant tubes, ballast systems.
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Power Generation: Feedwater heaters, condensers, auxiliary cooling systems.
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Chemical & Process: Handling corrosive fluids, process piping, evaporators.
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Oil & Gas: Offshore platform seawater cooling systems, brine handling.
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