Ductile iron pipe is a kind of cast iron pipe. The quality requires the spheroidization level of cast iron pipes to be 1-3 (spheroidization rate> 80%), so the mechanical properties of the material itself have 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. It has good mechanical properties, excellent corrosion resistance, good ductility, good sealing effect, easy installation, and is mainly used for water supply and gas transmission in municipal and industrial and mining enterprises. , Oil transportation, etc.
A certain amount of spherical graphite is distributed on the ferrite and pearlite matrix. According to the nominal diameter and the requirements for elongation, the proportion of ferrite and pearlite in the matrix structure is different. The proportion of small diameter pearlite Generally not more than 20%, the general control of large diameter is about 25%.
Ductile iron pipe is mainly called centrifugal ductile iron pipe, it has the nature of iron, steel performance, excellent corrosion resistance, good ductility, good sealing effect, easy installation, mainly used for municipal, industrial and mining enterprises water supply, gas transmission Oil etc. It is the first choice for water supply pipes, with a high cost performance. Compared with PE pipes, in terms of installation time, the installation of spherical ink tubes is simpler and faster than that of PE tubes, and the internal and external pressures are better after installation; from the perspective of airtightness and anticorrosion, the tightness of the spherical ink tubes after installation is also better. Various anti-corrosion methods can be used to improve the anti-corrosion performance; from the perspective of hydraulic performance, because the specifications of the spherical ink tube generally refer to the inner diameter, the specifications of the PE tube generally refer to the outer diameter, because under the same specifications, the spherical ink tube can achieve a greater radial flow; In terms of overall installation and maintenance cost, the ductile tube has a more superior cost performance. Spray zinc on the inner wall, anti-corrosion materials such as cement mortar, etc.
