Make plates for offshore drilling platforms, water boxes, valves, and other marine equipment that withstands salt water. Also known as cupro nickel, these copper nickel sheets resist rusting better than stainless steel. They also resist damage from algae and barnacle buildup, so you can even use them to build boat hulls—no protective paint needed. When carrying heavy loads, they won’t crack from chlorides, though they’re more likely to develop small holes from sulfides compared to stainless steel. They’re also sometimes used to house copper tubes to stop them from corroding nearby metal.

Like other copper alloys, these sheets are easy to machine and join with similar materials. You can spot weld, braze, and solder them. They carry electric currents and cool down quickly, making them good heat exchangers for fluids in HVAC systems and water treatment plants. Extreme freezing temperatures, even cryogenic levels, won’t reduce their strength or formability. They also stand up to humidity.

When cleaned regularly, these sheets prevent the growth of bacteria, viruses, and fungi. This makes them a good choice for hardware that’s touched frequently.

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