Ductile cast iron is kind of alloy of iron, carbon and silicon, in which graphite exists in the type of spherical, generally the size of graphite is 6-7 class, and spheriodization grade of the pipe should be controlled 1-3 class(spheroidization rate is not below 80%). Thus after spheroidization, ductile cast iron possesses the nature of iron as well as the
Ductile cast iron is kind of alloy of iron, carbon and silicon, in which graphite exists in the type of spherical, generally the size of graphite is 6-7 class, and spheriodization grade of the pipe should be controlled 1-3 class(spheroidization rate is not below 80%). Thus after spheroidization, ductile cast iron possesses the nature of iron as well as the characteristic of steel. After annealing, its microstructure contains ferrite and a little pearlite possessing excellent mechanical properties.
Much of the production of ductile iron is in the form of ductile cast iron pipe, used for water and sewer lines. Ductile cast iron pipe is stronger and easier to tap, requires less support and provides greater flow area compared with pipes made from other materials like PVC, concrete, polyethylene or steel. Ductile Iron Pipe is the most widely-used pipeline product in water supply and water drain/sewage projects.
|The standard of pipe:||SO 2531, EN545 , EN598.||Pipe class:||K9, C40, C30, C25, etc.|
push-on joint(Tyton joint), K type joint, self-restrained joint
in general, the pipe length is 6m for bulk shipment and 5.7m for container shipment.
|Internal lining:||cement mortar lining as per ISO4179||Zinc coating:||at least 130g/m2 as per ISO 8179|
|Bitumen painting:||at least 70um as per ISO 8179||Chemical composition (%)||
a) C: 3.5 – 4.0
b) Si: 1.9 – 2.6
c) Mn:0.15 – 0.45
c) P: <0.06
d) S: <0.02
Tensile strength: ≥420MPa
b)Yield strength: ≥300Mpa
c) Hardness: ≤230HB
d) Elongation%: DN80 – 1000 ≥10 DN1200 – 2200 ≥7
|Process and testing:||
a) Induction furnace and treated metal (Chemical analysis of raw material, spheroidizing & Nodularity)
b) Casting (Visual check and weight check)
c) Heat treatment (Micro structure)
d) Hydrostatic test (Pressure test)
e) Dimensional checks (Checking pipe length and joint, OD, wall thickness, appearance)
f) Zinc spraying (Thickness testing)
g) Lining and coating (100% visual check, thickness testing randomly)
i) Marking and packing (100% visual check)
The pipe coating can be customized, such as, zinc-aluminum alloy, PU, etc.
|Internal Lining||External Coating|
|Internal Lining||Pipes and Fittings||External Coating||Pipes and Fittings|
|Standard Coating||Portland cement or Blast furnace cement mortar||Standard Coating||Metallic zinc + Bituminous paint|
|Reinforced Protections||High alumina cement mortar||Reinforced Protections||Polyethylene sleeve applied|
|Special Coatings||Please consult us||Special Coatings||Polyurethane or polyethylene coating or Ceramic|
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