What are the characteristics of ductile iron pipes?

Ductile iron pipes are a type of cast iron pipe. The quality requirements for cast iron pipes include controlling the spheroidizing grade between 1-3 levels (spheroidizing rate >80%), thereby significantly improving the material's mechanical properties, combining the essence of iron with the performance of steel. After annealing, the microstructure of ductile iron pipes consists of ferrite with a small amount of spheroidite, featuring excellent mechanical properties, corrosion resistance, good ductility, and superior sealing performance. They are easy to install and are mainly used for municipal, industrial, and mining enterprises in water supply, gas transmission, and oil transportation.

On the ferrite and spheroidite matrix, a certain number of spherical graphite particles are distributed. The proportion of ferrite and spheroidite in the matrix structure varies depending on the nominal diameter and the required elongation. For small diameters, the spheroidite proportion is generally not more than 20%, while for large diameters, it is typically controlled around 25%.