Steel pipe knowledge: ductile iron pipe is mainly known as centrifugal ductile iron pipe

Ductile iron pipe is mainly called centrifugal ductile iron pipe. It has the nature of iron, steel performance, excellent anti-corrosion properties, good ductility, good sealing effect, easy installation, and is mainly used for water supply, gas transmission and transmission in municipal and industrial and mining enterprises. Oil and so on.
Ductile iron pipe is the first choice for water supply pipe and has a very high price/performance ratio. Compared with PE pipe, from the installation time, the spheroidal pipe is easier and faster to install than the PE pipe, and the inner and outer bearing pressures are better after the installation; from the perspective of hermeticity and corrosion resistance, the sealing property of the spheroidized pipe is better after the installation. Corrosion resistance can be improved by a variety of anti-corrosion measures; from the hydraulic performance point of view, because the specification of the spheroid tube generally refers to the inner diameter, the specification of the PE pipe generally refers to the outer diameter, because under the conditions of the same specification, the spheroidized tube can achieve greater runoff; In terms of comprehensive installation and maintenance cost, the ball-and-tube tube has a superior cost performance. The main components of ductile iron pipes are carbon, silicon, manganese, sulfur, phosphorus and magnesium. Spray zinc on the inner wall, cement mortar anti-corrosion materials, etc. Advantage:
High tensile strength, which is 3 times that of gray cast iron pipes; good resistance and high elongation of 5-15%. Impact resistance, resistance to sensation, corrosion resistance, ductile iron pipe manufacturers better than steel. The price is higher, only slightly lower than the steel pipe.
Although its corrosion resistance is better than that of steel pipe, its wall thickness is thin, and the rate of perforation buried in soil is much faster than that of gray cast iron pipe. If external corrosion protection is not enough, corrosive perforation will occur in 5-8 years. Corrosion rate of the pipe in the corroded soil reaches 0.5-1.5mm/a, so the external corrosion of the spheroidal pipe must be done according to the demand, and this is not easy to ensure in the production, construction, and installation, and the potential accident is formed.
The inner lining is usually coated with cement mortar. In some cases, the cement mortar fabric will affect helium in the water quality. Experiments indicate that if the mortar is corroded by lime-soluble water, the mortar will be lost, the mortar will be damaged, and the water will be alkalized. , PH value increase, increase chlorine consumption, water disinfection effect was affected. And because the function of cement and cast iron is quite different, under the conditions of external impact, internal pressure, and temperature change, the cement mortar fabric is more easily cracked, resulting in moisture entering, even falling off, increasing the water resistance and affecting the water quality.
This information is issued by 51 steel pipe network.

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