Why copper-nickel
for seawater.
For marine and offshore seawater piping, copper-nickel is the reference material - it resists corrosion, shrugs off biofouling and lasts for decades. Here is why 90/10 and 70/30 are specified worldwide.
Built for seawater
Copper-nickel forms a tenacious protective oxide film in seawater, giving excellent resistance to general corrosion, pitting and erosion-corrosion - even at service velocities that attack other alloys.
Naturally anti-fouling
The copper surface resists marine biofouling without biocides, so lines stay clear and flow rates hold over years of service - critical for firewater, cooling and ballast systems.
Decades of service life
Proven across shipbuilding and offshore since the 1950s, Cu-Ni seawater systems routinely deliver 25+ years of reliable service with low maintenance.
90/10 and 70/30 - which one
| Grade | Composition | Typical use | Max seawater velocity |
|---|---|---|---|
| Cu-Ni 90/10 | ~90% Cu, 10% Ni | General seawater piping, most marine systems | ~3.5 m/s |
| Cu-Ni 70/30 | ~70% Cu, 30% Ni | Higher strength / temperature / velocity duty | ~4.5 m/s |
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