Ductile iron pipe is a kind of cast
Quality requirements of spheroidal graphite cast iron
pipe grade control for 1 -
Level 3 (
Spheroidization rate > 80%)
, and got better improvement on the mechanical properties of the material itself, has the nature of the iron and steel performance.
After annealing of nodular cast iron
pipe, the microstructure of ferrite and a small amount of pearlite, good mechanical properties, anti-corrosion performance and ductility can good, good sealing effect, easy to install, it is mainly used for municipal, industrial and mining enterprises, water supply, gas, oil, etc.
In ferrite and pearlite matrix distribution has a certain number of nodular graphite, according to the requirement of the nominal diameter and elongation of different, the proportion of ferrite and pearlite in the matrix organization is different, small diameter of pearlite proportion is generally not more than 20%, the general control of large diameter is about 25%.
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