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Copper-Nickel Foil/Sheet (Cu70-Ni30)
Available Configurations
Properties common to all products in this list
| Thickness | Size |
|---|---|
| 0.016 mm to 1.6 mm | 10 x 10 mm to 300 x 300 mm |
Need custom configurations? Please contact us.
Key Features
Copper-Nickel Alloy Foil (Cu 70/Ni 30) is a cupronickel alloy foil combining excellent resistance to seawater and marine corrosion, non-magnetic character, stable electrical resistivity across a broad temperature range, and good formability in a solid-solution-strengthened alloy with no phase transformations in service:
Excellent Seawater and Marine Corrosion Resistance
The 30% nickel content raises corrosion resistance in seawater and biological environments significantly above that of commercially pure copper, establishing this composition as the standard for marine heat exchanger tubing. The alloy also provides good resistance to biofouling, distinguishing it from less corrosion-resistant copper alloys in submerged and tidal service environments.
Stable Electrical Resistivity Across a Broad Temperature Range
Electrical resistivity of approximately 37–42 µΩ·cm is stable across a broad temperature range, qualifying Cu70/Ni30 foil for electrical resistor and thermocouple compensation applications where resistivity stability with temperature is operationally important.
Non-Magnetic Character
Non-magnetic character across the service temperature range supports use in marine electronics EMI shielding and in offshore sensor assemblies where magnetic permeability would interfere with sensitive measurement systems.
Solid-Solution Strengthened with No Phase Transformations
The Cu70/Ni30 system forms a continuous solid solution across the full composition range with no phase transformations in service, providing consistent mechanical and physical properties from cryogenic temperatures to the upper service range without the microstructural changes that affect multi-phase alloys.
Good Formability
Good cold-working response supports the production of precision foil gauges, stamped components, heat exchanger plate elements, and gasket and seal geometries from the foil stock.
Industrial Applications
Copper-Nickel Alloy Foil is used across marine, offshore, architectural, and EMI shielding applications wherever seawater corrosion resistance, non-magnetic character, and stable electrical properties determine material selection:
- ✦ Marine Heat Exchanger and Condenser Plate Elements in Seawater Service
- Used for marine heat exchanger and condenser plate elements in seawater service, where the established corrosion resistance of Cu70/Ni30 in seawater and good biofouling resistance qualify this composition as the standard material for plate elements in direct seawater heat exchange service.
- ✦ Coinage Strip
- Applied as coinage strip, where the Cu70/Ni30 composition’s combination of corrosion resistance, hardness, distinctive color, and established coin production processing qualifies it for monetary coinage applications.
- ✦ EMI Shielding in Marine Electronics
- Used for EMI shielding in marine electronics, where non-magnetic character, good electrical conductivity, and excellent seawater corrosion resistance allow reliable long-term shielding performance in coastal, offshore, and naval electronic assemblies.
- ✦ Corrosion-Resistant Gasket and Seal Elements in Offshore Assemblies
- Applied as corrosion-resistant gasket and seal elements in offshore assemblies, where the seawater and sour gas corrosion resistance of Cu70/Ni30 provides long-term seal integrity in offshore process and instrument assemblies.
- ✦ Seawater Corrosion, Thermoelectric and Biofouling Research
- Serves as a model cupronickel alloy for seawater corrosion mechanism studies, thermoelectric property investigations, biofouling resistance evaluation, and as a well-characterized copper-nickel specimen for diffusion, phase diagram verification, and electrochemical characterization.
Material Properties
| Element | Value |
|---|---|
| Elongation at break( % ) | <45 |
| Tensile strength( MPa ) | 410-420 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 37.4 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Melting point( C ) | 1171 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 377@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 29.4 |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 16.2@20-300°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.94 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |