C71500

C71500 is a copper-nickel alloy designated in the UNS system, commonly referred to as copper-nickel 70/30. It is a wrought copper alloy consisting primarily of copper with about 30 percent nickel, and with small trace amounts of elements such as iron and manganese. The nickel content gives the alloy enhanced resistance to corrosion in seawater and many aggressive environments.

Key properties include excellent resistance to corrosion in marine atmospheres and seawater, good strength and ductility, and favorable formability. The alloy maintains toughness over a wide temperature range and exhibits good erosion resistance in flowing seawater. C71500 is not heat-treatable; its strength is largely controlled by the degree of cold work, and it remains weldable and machinable for many applications.

Fabrication and forms commonly available for C71500 include wrought products such as sheets, plates, bars, tubes, pipes, and fittings. It can be hot-worked or cold-worked and is typically supplied in temper conditions such as annealed (O) or work-hardened (H).

Applications for C71500 are dominated by marine and chemical processing uses. It is widely employed in seawater piping and tubing, condensers and heat exchangers, desalination equipment, offshore platforms, and various marine hardware due to its combination of corrosion resistance and mechanical strength.

Standards and designation: C71500 is the UNS designation for this copper-nickel alloy and is specified in various standards for copper-nickel alloys, including those governing wrought products and tubing. It is commonly specified for components exposed to seawater and other aggressive environments where copper-nickel alloys are preferred.