The air tightness of the nodular graphite pipe is better after installation, and the anti-corrosion performance can also be improved through various anti-corrosion methods; From the hydraulic performance point of view, ductile iron pipe can achieve greater runoff; From the perspective of comprehensive installation and maintenance costs, ductile iron pipes have better cost performance. Inner wall zinc spraying, cement mortar anti-corrosion materials, etc., are mainly used for municipal, industrial and mining enterprises water supply, gas transmission, oil transmission, etc., and are the first choice of cost-effective water supply pipelines.

Ductile iron is a kind of ductile iron material obtained by adding rare earth magnesium alloy and inoculation. The mechanical properties of ductile iron pipes are greatly improved. In order to distinguish ordinary cast iron, it is called nodular cast iron. It has the essence of iron and the performance of steel, high strength, high toughness, good corrosion resistance, good ductility, good sealing effect, simple installation, and strong internal and external pressure bearing capacity after installation;