Ductile iron pipes are of much better quality than ordinary cast iron pipes. The graphite in ordinary cast iron is in sheets and has very low strength. So ordinary cast iron strength is relatively low, brittle. The graphite in the graphite cast iron is spherical, equivalent to the existence of many spherical voids in the cast iron. The influence of spherical void on the strength of cast iron is much smaller than that of flake void, so the strength of ductile iron pipe is much higher than that of ordinary cast iron.
Advantages of ductile iron pipe application in water supply pipeline:
1. Because ductile iron pipe adopts flexible joint, the construction operation is more convenient, can improve the construction efficiency, improve the construction conditions, reduce the construction cost, and most of the interface adopts rubber ring connection, easy operation, can shorten the construction period, reduce the construction cost.
2. With high water supply pressure, resistance to external load and adapt to the change of geological conditions, the pipe has the advantages of high strength, good toughness, corrosion resistance, flexible interface convenient installation, strong seismic resistance, low labor intensity, can be applied to the geological poor section and across the highway, without additional processing of steel pipe, coupled with strong corrosion resistance, can be applied to the coastal and saline-alkali zone. At present, it is widely used in underground pipeline engineering. Large-scale pipeline installation projects can reflect its advantages of convenient installation and low labor intensity.
3. The nodular cast iron pipe has good sealing performance and is not easy to leak, which can reduce the leakage rate of pipe network and reduce the daily maintenance cost of pipe network.
Graphite in nodular cast iron is in spherical form. The size of graphite is 6~7. In terms of quality, the spheroidization grade of nodular cast iron pipe should be controlled as 1~3 grade spheroidization rate >. =80%. Therefore, the mechanical properties are better improved. Ductile iron pipe manufacturers suggest that after annealing ductile iron pipe, the metallographic structure is ferritic with a small amount of candlelight. Good mechanical properties.
Post time: Mar-15-2023