What is the difference between ductile iron pipe and ordinary cast iron pipe?

1. Different concepts
Machine-made cast iron pipe is a cast iron pipe with flexible interface drainage produced by centrifugal casting process. The interface is generally W-type clamp type or A-type flange socket type.

Ductile iron pipes refer to pipes that are cast by high-speed centrifugal casting using a centrifugal ductile iron machine after adding nodulizing agent to cast molten iron above No. 18. They are referred to as ductile iron pipes, ductile iron pipes and ductile cast pipes. Mainly used for the transportation of tap water, it is an ideal material for tap water pipelines.

2. Different performance
Ductile iron pipe is a type of cast iron, an alloy of iron, carbon and silicon. Graphite in ductile iron exists in the form of spheroids. Generally, the size of graphite is grade 6-7. The quality requires that the spheroidization grade of the cast pipe be controlled to grade 1-3, so the mechanical properties of the material itself are better improved. It has the essence of iron and the properties of steel. The metallographic structure of the annealed ductile iron pipe is ferrite plus a small amount of pearlite, and its mechanical properties are good.

The service life of machine-made cast iron pipes exceeds the expected life of the building. It has excellent earthquake resistance and can be used for earthquake protection of high-rise buildings. It uses flange glands and rubber rings or lined rubber rings and stainless steel clamps to flexibly connect. It has good sealing and allows Swings within 15 degrees without leaking.

Metal mold centrifugal casting is adopted. The cast iron pipe has uniform wall thickness, compact structure, smooth surface, and no casting defects such as blisters and slag inclusions. The rubber interface suppresses noise and is irreplaceable for the quietest pipes, creating the best living environment.
3. Different uses
Cast iron pipes are suitable for building drainage, sewage discharge, civil engineering, road drainage, industrial wastewater, and agricultural irrigation pipes; cast iron pipes can be suitable for large axial expansion and contraction displacement and lateral deflection deformation of pipelines; cast iron pipes are suitable for earthquakes with an intensity of 9 degrees Use in the following areas.

Ductile iron pipe is mainly called centrifugal ductile iron pipe. It has the essence of iron and the performance of steel. It has excellent anti-corrosion performance, good ductility, good sealing effect, and is easy to install. It is mainly used for water supply, gas transmission, and transportation in municipal, industrial and mining enterprises. oil etc. It is a water supply pipe and has a high cost performance.