C71500 CuNi 70/30 Copper Nickel Alloy Pipe Heat Exchanger Seamless Tubing
C71500 CuNi 70/30 Copper Nickel Alloy Pipe Heat Exchanger Seamless Tubing
1.Product Description
Copper nickel pipe is a corrosion‑resistant alloy tube available in two principal grades: 90/10 (C70600) and 70/30 (C71500). It is manufactured as seamless (SMLS) or welded (ERW) and complies with ASTM B466/B111, ASME SB111, EN 12451, and JIS H3300. The alloy’s unique combination of copper and nickel, plus iron and manganese, gives it outstanding resistance to flowing seawater, impingement attack, and crevice corrosion – making it the standard material for naval and offshore piping systems.
2.Primary applications:
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Seawater cooling lines, firewater mains, and ballast systems on ships and FPSOs.
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Heat exchanger tubes and condensers in power stations and desalination plants.
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Offshore subsea pipelines and risers (in clad or solid form).
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Hydraulic and pneumatic control lines in marine environments.
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Fish farm cages and seawater intake systems.
3.Advantages over other materials:
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vs. Stainless Steel – superior resistance to chloride pitting and crevice corrosion in seawater.
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vs. Titanium – much lower cost and easier to fabricate.
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vs. Carbon Steel – no need for coatings or cathodic protection in seawater.
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vs. Aluminium Brass – better resistance to impingement and ammonia attack.
4.Key Product Parameters
| Parameter | 90/10 (C70600) | 70/30 (C71500) |
| Nominal Composition (wt%) | Cu 88.6 min, Ni 10, Fe 1.4, Mn 0.8 | Cu 70, Ni 30, Fe 0.6, Mn 0.5 |
| Tensile Strength (MPa) | 303 – 414 | 350 (typical) |
| 0.2% Proof Stress (MPa) | 110 – 393 (temper dependent) | 120 (typical) |
| Elongation (%, on 50 mm) | 42 | 35 |
| Modulus of Elasticity (GPa) | 140 | 140 |
| Thermal Conductivity (W/m·K) | 50 | 29 |
| Density (g/cm³) | 8.9 | 8.95 |
| Electrical Resistivity (µΩ·cm) | 5.7 | 7.5 |
| Melting Range (°C) | 1080 – 1120 | 1170 – 1240 |
| Available OD (mm) | Seamless: 6 – 159; Welded: up to 419 | Same range |
| Wall Thickness (mm) | Seamless: 0.5 – 8; Welded: up to 10 | Same range |
| Standard Lengths | 6 m, 12 m, or cuttolength | 6 m, 12 m, or cut-to-length |
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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