The material of the ductile top pipe of the sewage pipe is called ductile iron pipe. Ductile iron pipe is a type of cast iron pipe. It is widely used in municipal construction, urban water supply, gas, heating and other fields with its advantages of high strength, corrosion resistance and wear resistance. Pipes made of this material can effectively prevent sewage leakage and corrosion, thereby ensuring the long-term stability and safety of the pipeline.