CuNi 70/30 Cupronickel Welded Pipe C71500 Marine Grade Piping with High Corrosion Resistance and Good Weldability
CuNi 70/30 Cupronickel Welded Pipe C71500 Marine Grade Piping for Shipbuilding Industry
1.Product Description
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Copper-nickel alloy tubes with 10% Ni (90-10/C70600) or 30% Ni (70-30/C71500).
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Micro-additions of Fe and Mn enhance corrosion resistance; single-phase FCC structure, no phase embrittlement.
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Supply forms: seamless (ASTM B466) or welded (ASTM B467).
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Silver-white metallic finish, clean oxide-free bore, precision cold-drawn dimensional tolerance.
2.Product Applications
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Marine & offshore: seawater cooling, firewater, ballast lines.
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Power plants: condensers, feedwater heaters, air-cooler bundles.
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Desalination: MSF/MED heating sections and evaporator tubes.
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Oil & gas: platform utility piping, riser sheathing.
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General industry: hydraulic tubing, chemical corrosion-resistant piping.
3.Product Advantages
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Seawater corrosion rate ≤0.025 mm/year, with self-healing protective film.
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Natural anti-biofouling, extending cleaning intervals by over 60%.
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Tensile strength 275~345 MPa, elongation ≥25% – excellent strength-ductility balance.
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Weldable, bendable, expandable – no SCC risk.
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Service life 15~25 years, 100% recyclable material.
4.Key Product Specifications
| Item | 90-10 (C70600) | 70-30 (C71500) | Remarks |
| Nickel Content | 9.0~11.0% | 29.0~33.0% | — |
| Iron Content | 1.0~1.8% | 0.4~1.0% | — |
| Tensile Strength (Annealed) | ≥275 MPa | ≥345 MPa | 70-30 for higher pressure |
| Yield Strength (Annealed) | ≥105 MPa | ≥140 MPa | — |
| Elongation (Annealed) | ≥25% | ≥30% | — |
| Hardness HV (Annealed) | ≈130 | ≈150 | — |
| Density (g/cm³) | 8.90 | 8.94 | — |
| Thermal Conductivity (W/m·K) | ≈50 | ≈29 | 90-10 better for heat transfer |
| Max Service Temperature | 250°C | 300°C | Derating required above 200°C |
| OD Supply Range | Φ6~325 mm | Φ6~325 mm | Custom sizes available |
| WT Supply Range | 1.0~30.0 mm | 1.0~30.0 mm | — |
| Single Length | Up to 16 m | Up to 16 m | Fixed length tolerance ±3mm |
| Delivery Condition | Annealed (O) / Light-drawn (H) | Annealed (O) / Light-drawn (H) | Specify upon ordering |
| Recommended Max Seawater Velocity | ≤4.5 m/s | ≤5.0 m/s | — |
| Applicable Standards | ASTM B466/B467/B111; DIN 86019; GB/T 8890 | Same | Class society certificates available |
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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