White copper is a copper base alloy with nickel as the main additive element, which is silvery white, so it is called Cupronickel. Ni and Cu can completely dissolve each other in solid state. Therefore, all kinds of Cu Ni alloys are a single-phase solid solution. Pure copper and Ni can significantly improve the strength, corrosion resistance, resistance and thermoelectric properties, and have good cold and hot processing properties. It can not be strengthened by heat treatment, but can only be improved by solution strengthening and work hardening. It is a key material in precision instruments, chemical machinery and medical devices Materials.

The copper nickel binary alloy is called ordinary white copper, and the white copper alloy with manganese, iron, zinc, aluminum and other elements is called complex white copper, which is correspondingly called manganese white copper, iron white copper, zinc white copper and aluminum white copper. Industrial white copper can be divided into structural copper and electrical white copper according to the performance characteristics and uses, which meet various corrosion resistance and special electrical and thermal properties respectively.

The grade of ordinary white copper is expressed as: B (white) + nickel mass fraction, such as B30. The special grade of white copper is expressed as: B (white) + second alloy element + Ni mass fraction - secondary alloy element mass fraction, such as B30; casting white copper has good casting process performance, medium slagging, fluidity and shrinkage, but strong air absorption, so it needs to be deoxidized by Cu Mn domain, Cu mg domain and Cu-P before pouring. The characteristics and application of cast white copper are shown in the table.