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90/10 Copper Nickel Overview
Copper Nickel 90/10 (UNS C70600) is a 90% copper, 10% nickel alloy that also contains small but important additions of iron and manganese. It is the most widely used copper-nickel alloy for marine service due to its excellent resistance to sea-water corrosion, erosion, and bio-fouling. Grade 90/10 provides good strength, high thermal conductivity, and excellent ductility. Its unique ability to resist the attachment of marine organisms (barnacles, algae) makes it the preferred choice for seawater piping systems and heat exchangers. Steel Emporium offers high-precision Cu-Ni 90/10 pipes and tubes in all major ASTM standards.
Key Material Advantages
Bio-Fouling Resistance
Inherent antimicrobial properties prevent marine growth without chemicals.
Excellent Workability
Extremely easy to weld, bend, and form into complex piping systems.
Thermal Conductivity
High heat transfer efficiency for condensers and evaporators.
| Grade | Cu | Ni | Fe | Mn | Zn | Pb | P |
|---|---|---|---|---|---|---|---|
| Cu-Ni 90/10 | Balance | 9.0 - 11.0 | 1.0 - 1.8 | 1.0 max | 0.5 max | 0.02 max | 0.02 max |
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (min) | 275 MPa | 40,000 psi |
| Yield Strength (0.5% extension) | 105 MPa | 15,000 psi |
| Elongation (% in 50mm) | 30% min | 30% min |
| Hardness (Rockwell F) | 55 - 65 HRF | - |
| Property | Value |
|---|---|
| Density | 8.94 g/cm³ (0.323 lb/in³) |
| Melting Point | 1100 - 1145 °C (2010 - 2100 °F) |
| Thermal Conductivity (20°C) | 40 W/m·K |
| Specific Heat | 380 J/kg·K |
| Electrical Resistivity | 0.190 µΩ·m |
| UNS | DIN / Werkstoff No. | EN Designation | JIS | Common Name |
|---|---|---|---|---|
| C70600 | 2.0872 | CuNi10Fe1Mn | C7060 | Copper Nickel 90/10 |
| NB Size | OD (mm) | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|---|
| 1/2" | 21.34 | 1.43 | 1.81 | 2.36 |
| 1" | 33.40 | 2.33 | 3.62 | 4.75 |
| 2" | 60.33 | 4.40 | 6.08 | 8.36 |
| 3" | 88.90 | 7.50 | 12.60 | 17.00 |
| 4" | 114.30 | 12.35 | 18.00 | 24.95 |
Industrial Applications
Shipbuilding
Seawater cooling pipes, intake screens & condensers.
Desalination
Evaporator tubing and high-pressure pumps.
Power Plants
Steam turbine condensers and oil coolers.
Offshore Rigs
Splash zone cladding and sea-water intakes.
Chemical Process
Handling salt solutions and organic chemicals.
Automotive
Brake and fuel lines for high corrosion safety.