Performance comparison between ductile iron pipes and ordinary cast iron pipes: The production process of ductile iron pipes is to add magnesium, calcium and other alkaline earth metals or rare metals to the raw materials of ordinary cast iron pipes. The casting processes of ductile iron pipes include continuous casting, hot mold casting and water-cooling centrifugal casting. Among them, the water-cooling method is the most advanced process in the world today. Compared with ordinary cast iron pipes, the technical performance of ductile iron pipes in different processes not only maintains the advantages of ordinary cast iron pipes. Excellent corrosion resistance, and has the advantages of high strength, good toughness, thin wall, light weight, impact resistance, large bending performance, and easy installation. Therefore, ductile iron pipes are not only commonly used abroad, but have also been well promoted and used in China. In many areas of our country, ductile iron pipes have been commonly used in medium and small diameter water supply pipes; the performance of ductile iron pipes and steel pipes Comparison: Steel pipes can be divided into seamed steel pipes and seamless steel pipes. Sealed pipes are generally used in the middle of water supply pipes.
Compared with ductile iron pipes, steel pipes have the advantages of good toughness, high tensile strength, thin pipe walls, high pressure resistance, long pipes, and fewer interfaces. The biggest disadvantages are poor corrosion resistance and high price. Therefore, under normal circumstances, except for small-diameter pipelines and special projects (such as pipe jacking projects; Performance comparison of ductile iron pipes and prestressed reinforced concrete pipes: Ductile iron pipes and prestressed reinforced concrete pipes (applicable to large-diameter pipes, the maximum The diameter has exceeded 2000) and has the following characteristics: (1) It saves energy, and the main materials are sand and stone, which can be obtained locally. (2) It is heavy, brittle, difficult to cut, and relatively difficult to construct. (3) The working pressure is 2o% to 40% lower than that of ductile iron pipes, which is 0.15-0.25MPa. (4) The maximum deflection angle is 1.5 degrees, while the maximum deflection angle of ductile iron pipes can be 3.0 degrees, so prestressed reinforced concrete. The tube has poor terrain adaptability?