Nodular cast iron pipe refers to a pipe made of cast iron with the No. 18 or more, added with nodulizer, and then centrifugally cast by a centrifugal nodular cast iron machine. It is mainly used for the transportation of tap water and is an ideal material for tap water pipelines.
The essence of the cast iron steel pipe is the ductile iron pipe, because the ductile iron pipe has the nature of iron and the performance of steel, so it is called this. The graphite in the ductile iron pipe exists in the form of spheroid, the size of general graphite is 6-7 grade. The quality requires that the spheroidization level of the cast iron pipe is controlled to 1-3, and the spheroidization rate is ≥80%, so the mechanical properties of the material itself are better improved, with the essence of iron and the performance of steel. After annealing, the ductile iron pipe has a metallographic structure of ferrite plus a small amount of pearlite, and its mechanical properties are good, so it is also called cast iron steel pipe.
Features: It has the nature of iron, steel performance, excellent corrosion resistance, good ductility, and easy installation. It is mainly used for water supply and gas transmission of municipal industrial and mining enterprises.
Ductile iron pipe is a kind of cast iron, which is an alloy of iron, carbon and silicon. Graphite in nodular cast iron exists in the form of spheroid. Generally, the size of graphite is 6-7 grades. The quality requires that the spheroidization grade of the cast pipe is controlled to 1-3 grade (spheroidization rate ≥80%) The performance has been better improved, with the essence of iron and the performance of steel. The annealed ductile iron tube has a metallographic structure of ferrite plus a small amount of pearlite, and its mechanical properties are good.
