Ductile iron casting pipes are stronger than ordinary cast iron pipes. Both spheroidal graphite cast iron and ordinary cast iron contain graphite monomer, which means that cast iron is a mixture of iron and graphite. Graphite in ordinary cast iron exists in the form of flakes. The strength of graphite is very low, so there are many sheet-like voids in cast iron, so ordinary cast iron is relatively low in strength and brittle. The graphite in graphite cast iron is spherical, which is equivalent to the presence of many spherical voids in the cast iron. The effect of spherical voids on the strength of cast iron is much smaller than that of sheet-like voids, so the strength of nodular cast iron is much higher than that of ordinary cast iron. High-strength ductile iron pipes are certainly popular! The performance of nodular cast iron is close to that of medium carbon steel. The price is much cheaper. Vermicular graphite cast iron is the best, but expensive. Gray cast iron is worse. White cast iron is the worst. The first two are named after the shape of the graphite contained. The latter two graphites are all in the form of flakes, which split the ferrite and cause stress concentration, so the strength is low.
Ductile iron pipes have the nature of iron, the properties of steel.
Compared with ordinary cast iron pipes, ductile iron pipe fittings are stronger, more resistant to impact and less prone to corrosion. The inner wall is lined with cement mortar, which improves the pipeline water supply environment, improves water supply capacity and reduces energy consumption.