Ductile Iron Pipes Require Corrosion Protection Publication

For the corrosion-resistant lining of ductile iron pipes, mixed mortar corrosion-resistant lining has high compressive strength. Epoxy ceramic lining is suitable for sewage pipes and gas pipelines. The internal corrosion protection of ductile iron pipes usually adopts cement mortar lining, while the external corrosion protection uses a zinc spraying process + asphalt coating finish. These methods can effectively isolate the erosion of poor water quality and corrosive soil. However, its manufacturing process is difficult and costly, so it has certain limitations in application. Epoxy ceramic lining is an excellent corrosion-resistant coating with high adhesion and smoothness. Ductile iron pipes from manufacturers can be used for several years or more. The main area prone to rust is the outer wall in contact with soil, due to its high humidity and high oxygen content. Qualified corrosion protection can resist rusting.

Even after a very long time, there will be no problems. Graphite in ductile iron pipes exists in a spherical form, and the general size of graphite is Grade 6-7. In terms of quality, the nodulization grade of cast iron pipes is required to be controlled at Grade 1-3, with a nodulization rate ≥ 80%. Therefore, the mechanical properties of the material itself have been well improved, possessing the nature of iron and the performance of steel. In such scenarios, we must control our manufacturing processes and ensure good corrosion protection. Water supply pipe networks are usually buried underground and inevitably affected by loads from the soil and vehicles. Ductile iron pipes themselves have the nature of iron and the performance of steel.

After 300 years, except for the maintenance and replacement of some pipes and joints, the main body is still in use. Current Situation and Prospects of Ductile Iron Pipes in China. The industry of ductile iron pipe manufacturers in China started in the early 1990s and has developed rapidly with strong support from the China Urban Water Supply Association. After nearly 20 years of practical use, it can ensure that the pipes effectively resist external loads, making laying more economical. They have good adhesion, are environmentally friendly, have a long service life, and provide excellent protection for pig iron, effectively separating water from pig iron.