Spheroidal graphite cast iron is a kind of cast iron material with spheroidal graphite obtained by adding rare earth magnesium alloy and inoculation. Ductile iron pipe greatly improves the mechanical properties. It is called ductile iron in order to distinguish ordinary cast iron. It has the essence of iron and the performance of steel, high strength, high toughness, excellent corrosion resistance, good ductility, good sealing effect, simple installation, and strong internal and external pressure bearing after installation; The airtightness of the nodular graphite pipe after installation is better, and the anti-corrosion performance can also be improved by various anti-corrosion methods; From the hydraulic performance point of view, the ductile iron pipe can achieve greater runoff; From the perspective of comprehensive installation and maintenance cost, the ductile iron pipe has a better cost performance. Inner wall is sprayed with zinc, cement mortar anti-corrosion materials, etc. It is mainly used in municipal, industrial and mining enterprises for water supply, gas transmission, oil transportation, etc. It is the first choice of water supply pipes with high cost performance.
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