Sometimes called cupro-nickels, there exists a range of different copper nickel alloys that possess different properties and hence are suited to a range of different applications. Some of the better known copper nickel alloys include:

•         Copper with 10% nickel

•         Copper with 30% nickel

•         Copper with 25% nickel with 0.05-0.4% manganese

•         Copper with 45% nickel (also known as constantan)

All copper nickel alloys consist of only one phase as the copper nickel binary system exhibits complete solid solubility.