The difference between ductile iron pipe and ordinary cast iron pipe

The difference between ductile iron pipe and ordinary cast iron pipe

1. Different concepts

The machine-made cast iron pipe is a flexible joint drainage cast iron pipe produced by a centrifugal casting process. The joint is generally W-shaped clamp type or A-shaped flange socket type.

Nodular cast iron pipe refers to a pipe made by high-speed centrifugal casting by a centrifugal nodular cast iron machine after adding spheroidizing agent to molten iron of No. 18 or higher, referred to as nodular pipe, nodular iron pipe and nodular cast pipe, etc. It is mainly used for the transportation of tap water and is an ideal material for tap water pipelines.

2. Different performance

Ductile iron pipe is a kind of cast iron, which is an alloy of iron, carbon and silicon. Graphite in ductile cast iron is in the form of spheroids. Generally, the size of graphite is 6-7. The quality of the cast pipe is required to control the spheroidization level of 1-3, so the mechanical properties of the material itself have been better improved. It has the essence of iron and the performance of steel. The annealed ductile iron pipe has a metallographic structure of ferrite plus a small amount of pearlite, and its mechanical properties are better.

The service life of the machine-made cast iron pipe exceeds the expected life of the building. It has excellent seismic performance and can be applied to the seismic fortification of high-rise buildings. It adopts flange gland and rubber ring or lining rubber ring and stainless steel clamp flexible connection, good sealing performance, allow Swing within 15 degrees without leakage.

Using metal centrifugal casting, the cast iron pipe has uniform wall thickness, dense structure, smooth surface, no sand holes, slag inclusion and other casting defects. The rubber interface suppresses noise and is the quietest pipe that cannot be replaced, creating the most comfortable living environment.

3. Different uses

Cast iron pipes are suitable for construction drainage, sewage drainage, civil engineering, road drainage, industrial wastewater, and agricultural irrigation pipes; cast iron pipes can be suitable for larger pipe axial expansion and contraction displacement and lateral deflection deformation; cast iron pipes are suitable for seismic intensity of 9 degrees Used in the following areas.

The graphite cast iron pipe is mainly called the centrifugal ductile iron pipe. It has the essence of iron, the properties of steel, excellent anti-corrosion performance, good ductility, good sealing effect, easy installation, and is mainly used for water supply, gas transmission, and transportation of municipal, industrial and mining enterprises. Oil etc. It is the first choice for water supply pipes and has a high cost performance.