Commonly used in water treatment plants, these tubes withstand salt water and can be used to make shims, ferrules, and washers. Made from an alloy known as cupro nickel, they resist corrosion and stress-cracking from chlorides better than stainless steel. They also resist rusting, withstand humidity, and will not corrode from algae and barnacle build-up. However, these tubes are more likely to develop pits from sulfides than stainless steel. A good choice for cryogenic processing plants, these tubes remain ductile and strong even at freezing temperatures.

Like other copper alloys, these tubes are easy to machine. Spot weld, braze, and solder them to join them with like materials. They conduct electricity and heat, so they are often used in heat exchangers and condensers in HVAC systems and applications where fluids need cooling or heating. When cleaned regularly these tubes resist bacteria, fungi, and viruses, so they can be used in high-touch areas on ships and in healthcare settings.

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