First of all, let's learn what a ductile iron pipe is. Ductile iron pipe is a kind of pipe made by adding nodulizer into molten iron above 18 and then centrifugal casting with centrifugal ductile iron machine at high speed. Short for ball pipe, nodular cast iron pipe and nodular cast iron pipe, the main components are carbon, silicon, manganese, sulfur, phosphorus and magnesium. Ductile iron pipe is also an ideal material for tap water pipeline, and its main purpose is naturally to transport tap water.
In many areas of our country, the connection of ductile iron pipes between medium and small diameter pipes mainly adopts socket or flange interface; Moreover, the allowable limit angle of ductile iron must have absolute earthquake resistance and sealing performance.
Secondly, we should know what characteristics ductile iron pipes have. As the name implies, nodular cast iron pipe is a kind of cast iron pipe, and the spheroidization grade of cast iron pipe is required to be 1-3, that is, the spheroidization rate is not less than 80%, which can better improve the mechanical properties of nodular cast iron pipe material itself, thus having the properties of iron and steel. After annealing, the metallographic structure of ductile iron pipe is ferrite and a little pearlite, which makes it have the characteristics of good mechanical properties, excellent corrosion resistance, good ductility, good sealing effect and simple installation. In addition, in the medium and low pressure pipe network, ductile iron pipe has the advantages of safe operation, reliability, low damage rate, convenient construction and maintenance, excellent corrosion resistance and so on. , but it also has some shortcomings, such as low pressure resistance in high-pressure pipe network, so it is generally not used; The pipe body is relatively heavy, so machinery must be used for installation; If there is water leakage after the pressure test, all the pipes must be dug out, and then the pipes should be hoisted to the height where they can be put into clamps, and clamps should be installed to prevent water leakage.
After understanding the internal characteristics, it is also necessary for us to understand the appearance performance of ductile iron pipes. Ductile iron pipe, also known as centrifugal ductile iron pipe, is mainly used for water supply, gas transmission and oil transmission in municipal, industrial and mining enterprises. It is the first choice for water supply pipeline materials, so it has high cost performance.
Finally, we must pay attention to the anticorrosion treatment of ductile iron pipes. Mainly includes the following methods:
1.？ Apply asphalt paint, which is suitable for gas pipelines. Moreover, preheating the pipeline before painting can improve the adhesion of asphalt paint, thus accelerating drying.
2.？ Using cement mortar lining and special coating, this method is suitable for the pipeline conveying sewage and can improve the corrosion resistance of the lining.
3.？ Epoxy coal tar pitch coating is suitable for gas pipeline and sewage pipeline. The coating has high adhesion and a very smooth surface.
4. Using epoxy ceramic lining, this method is suitable for sewage pipeline and gas pipeline, but its manufacturing process is difficult and its cost is high, which has certain limitations in use. Epoxy ceramic lining is an excellent anticorrosive coating with high adhesion and smoothness.
5.？ Use aluminate cement coating or sulfate cement coating. This method is suitable for the internal corrosion protection of nodular cast iron pipes in sewage pipelines, and can improve the corrosion resistance of acid and alkali components in sewage.
6.？ Polyurethane coating is a new type of green special coating developed to meet the needs of environmental protection, which has good wear resistance and corrosion resistance.
Through today's introduction, I believe you have a certain understanding of ductile iron pipes, which is also the greatest affirmation of my introduction today. Anyway, I hope I can help you. Please continue to pay attention to this website for more information!