Steel pipe network: ductile iron pipe is mainly called centrifugal ductile iron pipe

Ductile iron pipe, also known as centrifugal ductile iron pipe, combines the properties of both iron and steel. It offers excellent corrosion resistance, good ductility, strong sealing performance, and is easy to install. This type of pipe is widely used in municipal water supply systems, industrial and mining enterprises, gas transmission, and oil pipelines. As the preferred choice for water supply piping, it provides a high cost-performance ratio. Compared to PE pipes, ductile iron pipes are easier and faster to install. Once installed, they exhibit better internal and external pressure resistance. In terms of sealing and corrosion resistance, ductile iron pipes offer superior performance after installation. Corrosion resistance can be further enhanced through various anti-corrosion treatments. From a hydraulic perspective, ductile iron pipes are typically specified by their inner diameter, while PE pipes are measured by their outer diameter. This means that, under the same nominal size, ductile iron pipes allow for a larger flow capacity. In terms of overall installation and maintenance costs, ductile iron pipes offer a more favorable cost-benefit ratio. The main components of ductile iron pipes include carbon, silicon, manganese, sulfur, phosphorus, and magnesium. To enhance durability, the inner walls are often coated with zinc or cement mortar. Advantages of ductile iron pipes include high tensile strength—three times that of gray cast iron—and good impact resistance, with elongation ranging from 5% to 15%. They are more resistant to corrosion than steel pipes, although their price is slightly higher than that of steel pipes. Despite its corrosion resistance being better than that of steel pipes, ductile iron pipes have a thinner wall, making them more prone to perforation when buried in soil. If external corrosion protection is inadequate, perforation can occur within 5 to 8 years. In corrosive soils, the corrosion rate can reach 0.5 to 1.5 mm per year. Therefore, proper external corrosion protection is essential. However, ensuring this level of protection during production, construction, and installation can be challenging, leading to potential safety risks. The inner lining of ductile iron pipes is usually coated with cement mortar. However, in certain cases, this coating can affect water quality. Experiments show that if the mortar is exposed to lime-soluble water, it may degrade, become damaged, and cause the water to become alkaline, increasing the pH and chlorine consumption, which can negatively impact disinfection effectiveness. Additionally, due to the different behaviors of cement and cast iron under external impacts, internal pressure, and temperature changes, the cement mortar lining is more susceptible to cracking, allowing moisture to penetrate and potentially causing the coating to fall off. This can increase water resistance and compromise water quality. For more information on pipe materials and applications, visit: http://?id=3

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