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ISO2531 k9 ductile iron pipes round ductile pipe 6 meter long DI pipe factory for water

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Ductile iron pipe is a kind of cast iron, which is an alloy of iron, carbon and silicon. Graphite in spheroidal graphite cast iron is in the form of spheroids. Generally, the size of graphite is 6-7. The quality requires that the spheroidization level of the cast pipe be controlled to be 1-3 (spheroidization rate ≥80%)…


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Ductile iron pipe is a kind of cast iron, which is an alloy of iron, carbon and silicon. Graphite in spheroidal graphite cast iron is in the form of spheroids. Generally, the size of graphite is 6-7. The quality requires that the spheroidization level of the cast pipe be controlled to be 1-3 (spheroidization rate ≥80%), so the material itself is mechanical The performance has been better improved, with the essence of iron and the performance of steel. The annealed ductile iron pipe has a metallographic structure of ferrite plus a small amount of pearlite, and its mechanical properties are better. Ductile iron pipes are mainly called centrifugal ductile iron pipes. It has the essence of iron, the properties of steel, excellent anti-corrosion performance, good ductility, good sealing effect, easy installation, and is mainly used for water supply, gas transmission, and transportation of municipal, industrial and mining enterprises. Oil etc. It is the first choice for water supply pipes and has a very high cost performance. Compared with PE pipes, in terms of installation time, ductile pipes are easier and faster to install than PE pipes, and have better internal and external bearing pressure after installation; from the perspective of airtightness and corrosion resistance, ductile pipes have better airtightness after installation, and A variety of anti-corrosion methods can be used to improve the anti-corrosion performance; from the perspective of hydraulic performance, because the specifications of ductile pipes generally refer to the inner diameter, the specifications of PE pipes generally refer to the outer diameter, because under the same specifications, the ductile tube can achieve greater runoff; from In terms of comprehensive installation and maintenance costs, the ductile tube has a more superior cost performance. The inner wall is sprayed with zinc, cement mortar and anticorrosive materials.

1. Asphalt paint coating
Asphalt paint coating is used to transport gas pipelines. Preheating the pipe before painting can improve the adhesion of the asphalt paint and accelerate the drying.

2. Cement mortar lining + special coating
This kind of internal anti-corrosion measures is suitable for pipelines conveying sewage and can improve the corrosion resistance of the inner lining.

3. Epoxy coal pitch coating
The epoxy coal tar coating is suitable for both gas pipelines and sewage pipelines. It is a two-component coating that has high adhesion and a very smooth surface.

4. Epoxy ceramic lining
Epoxy ceramic lining is suitable for sewage pipes and gas pipes, but due to the difficult manufacturing process and high cost, it has certain limitations in use. Epoxy ceramic lining has high adhesion and smoothness, and is a good anti-corrosion coating.

5. Aluminate cement coating or sulfate cement coating
Both of these special cement coatings are suitable for the internal anti-corrosion of ductile iron pipes used in sewage pipelines to improve the corrosion resistance of the acid and alkali components in the sewage.

6. Polyurethane coating
It is a new type of green special coating developed to meet the needs of environmental protection. It has good wear resistance and corrosion resistance.

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