The microstructure of copper base corrosion resistant alloy should be single-phase to avoid electrochemical corrosion caused by the second phase in the alloy. For this reason, the added alloy elements should have great solid solubility in copper bars, even infinitely miscible elements. Single phase brass bars, bronze bars and white copper bars used in engineering have excellent corrosion resistance and are important heat exchange materials.

The properties of copper bars produced by ordinary continuous casting copper bars can not reach the standard. The copper bars produced by extrusion process have good tensile strength, high hardness and high straightness. Generally, the amount of precision copper parts such as auto parts, medical parts and electrical accessories is relatively large.