What is a ductile iron pipe?
Ductile iron pipe is made of cast iron, carbon and silicon alloy. It is a product of blast furnace smelting of iron ore.According to the different forms of carbon in cast iron, it can be divided into steel-making cast iron, cast iron and ductile iron, etc.Ductile iron is a kind of high strength cast iron material developed in 1950s, its comprehensive performance is close to steel.Ductile iron is used to cast parts with high strength, high toughness and wear resistance due to its excellent properties.Ductile iron is a widely used cast iron material after gray cast iron.The so-called “substitute iron steel”, mainly refers to ductile iron.
The graphite in ductile iron tubes is in the form of spheroidal graphite.The general graphite particle size grade is 6-7.In terms of quality, the spheroidization grade of cast iron pipes is required to be 1-3 grades, and the spheroidization rate is 80%, thus improving the mechanical properties of the materials themselves.The microstructure of ductile iron after annealing is ferrite and a small amount of pearlite with good mechanical properties.
Ductile iron pipe is also called centrifugal ductile iron pipe, and its fittings are magnesium or rare earth magnesium combined with the gold pellets and then poured into the molten iron, thus reducing the stress concentration of the graphite ball.Ductile iron pipe has the advantages of good corrosion resistance, ductility, good sealing effect and easy installation.Ductile iron pipes are mainly used in water, gas, oil and other projects in municipal and industrial and mining enterprises.
Ductile iron pipe is the first choice of water supply pipe, high cost performance.Compared with PE pipe, ductile iron pipe installation time, installation of ductile iron pipe is simpler and faster than PE pipe, and the internal and external pressure after installation is better.In terms of air tightness and anti-corrosion performance, ductile iron pipe has better sealing performance after installation, and various anti-corrosion means are adopted to improve the performance.From the perspective of hydraulic performance, since the specifications of ductile iron pipes generally refer to the inside diameter, while the specifications of PE pipes generally refer to the outside diameter, under the same specifications, ductile iron pipes can achieve greater runoff.From the point of view of comprehensive installation and maintenance costs, ductile iron pipe has superior economic benefits.
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