C61900 copper tube is an aluminum bronze alloy, the main components of which include copper (Cu) as the matrix, aluminum (Al) and iron (Fe) as the main added elements, and a small amount of nickel (Ni), zinc (Zn), tin (Sn), lead (Pb) and other elements. This material has high strength, high hardness, good wear resistance and corrosion resistance, as well as excellent electrical and thermal conductivity.