Recently, the Qingdao municipal construction project was fully launched, and ductile iron pipes became the preferred material for the pipe network construction of the project. Due to the excellent strength, corrosion resistance and long service life of ductile iron pipes, they can effectively improve the stability and safety of urban water supply, drainage and gas transmission systems. The project leader said: "The use of ductile iron pipes not only reduces construction costs, but also provides guarantees for the long-term operation of urban infrastructure." This indicates that ductile iron materials are playing an increasingly important role in the construction of smart cities.