CuNi 70/30 Copper Nickel Alloy Tube C71500 Seamless Pipe Heat Exchanger Condenser Tubing
CuNi 70/30 Copper Nickel Alloy Tube C71500 Seamless Pipe Heat Exchanger Condenser Tubing
1.Product Description
Cupronickel tubes are copper‑nickel alloy pipes with nickel contents typically between 10 % and 30 %, dominated by the widely used grades UNS C70600 (90/10 copper‑nickel) and UNS C71500 (70/30 copper‑nickel). They exhibit a stable face‑centered cubic lattice, providing excellent toughness and outstanding resistance to marine corrosion. The nickel addition promotes rapid formation of a thin, firmly adherent oxide film that acts as a self‑repairing barrier. These tubes are produced as seamless or welded types, complying with ASTM, ASME, EN, and GB standards for condenser, heat exchanger, and general piping service.
2.Product Applications
These tubes are indispensable in seawater and brine handling systems. Typical installations include:
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Shipboard cooling, fire‑main, ballast and bilge piping, plus condenser tubing in navy and merchant vessels.
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Tube bundles for heat exchangers, condensers, evaporators and distillers in thermal/nuclear power plants and chemical plants.
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Evaporator and condenser sections in MSF and MED desalination units.
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Offshore platform seawater supply, hydraulic lines, risers and firewater networks.
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Coastal power station condensers and auxiliary cooling loops.
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Additional uses: vehicle brake tubing, compressed air lines, and marine aquaculture recirculation systems.
3.Product Advantages
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Outstanding corrosion resistance – Extremely low corrosion rates (0.025～0.0025 mm/year) in seawater; immune to stress‑corrosion cracking; strong against pitting, crevice and intergranular attack.
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High erosion‑corrosion tolerance – Iron and manganese additions effectively resist impingement and abrasion from high‑velocity flows.
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Good thermal performance – Thermal conductivity (30‑50 W/m·K) surpasses most stainless steels, ensuring efficient heat transfer.
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Inherent antifouling – Copper ions deter barnacles, mussels, algae and other marine organisms.
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Balanced mechanical properties – Reasonable strength and ductility, with cold‑work strengthening capability.
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Excellent workability – Readily bent, flared, stamped, and welded (TIG/MIG) with joint corrosion resistance matching the parent metal.
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Extended service life – The protective film thickens and heals over time, providing lasting reliability.
4.Key Product Specifications
| Parameter | 90/10 (UNS C70600) | 70/30 (UNS C71500) |
| Nickel (Ni) content | 9.0 – 11.0 % | 29.0 – 33.0 % |
| Iron (Fe) content | 1.0 – 1.8 % | 0.40 – 1.0 % |
| Manganese (Mn) content | ≤ 1.0 % | ≤ 1.0 % |
| Lead (Pb) content | ≤ 0.05 % | ≤ 0.05 % |
| Zinc (Zn) content | ≤ 1.0 % | ≤ 1.0 % |
| Copper (Cu) | Remainder | Remainder |
| Tensile Strength (min) | ≥ 275 MPa | 372 – 517 MPa |
| Yield Strength | — | 88 – 483 MPa (depends on temper) |
| Elongation (min) | ≥ 28 % | 45 % |
| Density | ~ 8.9 g/cm³ | ~ 8.94 g/cm³ |
| Thermal Conductivity | ~ 50 W/(m·K) | ~ 29 W/(m·K) |
| Melting Point | 1100 – 1150 °C | ~ 1171 °C |
| Coeff. of Thermal Expansion (20300 °C) | ~ 17×10⁻⁶ /K | ~ 16.2×10⁻⁶ /K |
| Electrical Resistivity | ~ 19 µOhm·cm | ~ 37.4 µOhm·cm |
| Specific Heat | 377 J/(kg·K) | 377 J/(kg·K) |
| Outside Diameter (seamless) | 6.35 – 152.4 mm (same for both grades) | |
| Outside Diameter (welded) | 12.7 – 355.6 mm (same for both grades) | |
| Wall Thickness (seamless) | 0.89 – 7.14 mm (same for both grades) | |
| Wall Thickness (welded) | 0.89 – 6.35 mm (same for both grades) | |
| Length | 3 – 12 m (customizable, same for both grades) | |
| OD Tolerance (seamless, for OD ≤ 2 mm) | ± 0.05 mm | |
| OD Tolerance (welded, for OD > 5 mm) | ± 5 % | |
| Wall Thickness Tolerance | ± 10 % (both grades and forms) |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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