The copper flat bar in China is the brass flat bar, also known as red copper. It has good electrical conductivity, thermal conductivity, corrosion resistance and processing properties, and has excellent plasticity. The copper flat bar is easy to be processed by hot pressing and cold pressing, and can be welded and brazed. There are few impurities that reduce electrical conductivity and thermal conductivity, and trace oxygen has little effect on electrical conductivity, thermal conductivity and processing properties, but it is easy to cause "hydrogen disease", and it is not suitable for processing (annealing) in a reducing atmosphere at high temperature (such as >370°). ·Welding, etc.) and use, it is widely used in the manufacture of wires, cables, brushes, electric spark erosion copper and other products that require good electrical conductivity.