Ductile iron pipe fittings have the characteristics of high strength, high elongation, impact resistance, corrosion resistance, and good sealing. The inner wall is lined with cement mortar, which improves the pipeline water delivery environment, increases water supply capacity, and reduces energy consumption; the pipe mouth is flexible interface, and the pipe itself has a large elongation, making the pipe more flexible. In the buried pipe, it can work with the soil around the pipe to improve the stress state of the pipe, thereby improving the reliability of the pipe network operation. . Therefore, my country's water supply industry usually uses ductile iron pipes as main pipes.