Copper tubes are divided into two types: copper tubes and brass tubes. The grades of copper tubes are T2, T3, T4 and TUP, etc., and the grades of brass tubes are H62 and H68. Copper pipes have good thermal conductivity and are suitable for working temperatures below 250°C. They are mostly used in the manufacture of heat exchangers, compressor oil pipes, low-temperature pipes, automatic control instruments, heat preservation and mixing heat pipes, and oxygen pipes.