With the development of the electronics industry, copper and its alloy connectors have become important basic materials, and the modernization of connectors has put forward higher and newer requirements on copper alloy materials. Not only has high electrical conductivity, corrosion resistance, oxidation resistance, excellent stamping properties and good bending properties, while requiring materials with high yield ratio, excellent elasticity and stress relaxation ability, the material should have a lower cost . The connector is mainly used in the field of communications, computers and automobiles. Currently, the most commonly used copper alloy materials are H65 brass and QSn6.5-0.1 tin bronze. For applications requiring high strength, high electrical conductivity or special occasions, C7025 silicon bronze and C18070 / C18080 chrome bronze will be used.