Ductile iron pipe is a kind of cast iron pipe. Quality requirements of cast iron pipe spheroidization grade control for 1-3 (spheroidization rate “80%), so the mechanical properties of the material itself has been better improved, with the nature of iron, steel performance. Annealed ductile iron pipe, its metallographic structure is ferrite and a small amount of pearlite, good mechanical properties, excellent corrosion resistance, good ductility, good sealing effect, easy to install, mainly used for municipal, industrial and mining enterprises water supply, gas, oil and so on.
A certain amount of spherical graphite is distributed on the ferrite and pearlite matrix. According to the requirements of nominal diameter and elongation, the proportion of ferrite and pearlite in the matrix is different. The proportion of pearlite in small diameter is generally not more than 20%, and that in large diameter is generally controlled at about 25%.
It has the nature of iron, the performance of steel, excellent anticorrosion performance, good ductility, good sealing effect, easy to install, mainly used for municipal, industrial and mining enterprises water supply, gas, oil and so on. It is the first choice of water supply pipe, with high cost performance. Compared with PE pipe, from the installation time, the installation of spherical ink pipe is simpler and faster than PE pipe, and the internal and external pressure is better after installation; From the airtight and anticorrosive point of view, after the installation of spherical ink tube airtight is better, but also through a variety of anticorrosive means to improve the corrosion resistance; In terms of hydraulic performance, the specifications of spheroidal ink tube generally refer to the inner diameter, and the specifications of PE tube generally refer to the outer diameter, because under the same specifications, the spheroidal ink tube can achieve greater runoff; From the comprehensive installation and maintenance cost point of view, spheroidal ink tube has a more superior cost performance. Inner wall spraying zinc, cement mortar anti-corrosion materials.