ISO2531 Standard Cement Lined Pipe Ductile Iron Zinc Bitumen K9
Class
Cement Lined Ductile Iron Pipe overview:
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. When used
under the conditions for which they are designed, in permanent or
in temporary contact with water intended for human consumption,
ductile iron pipes, fittings and their joints shall not have
detrimental effects on the properties of that water for its
intended use. Ductile iron pipeline systems, including pipes,
fittings, accessories and joints, consist of various materials.
When used for conveying water intended for human consumption, the
materials in contact with the water shall meet the relevant
requirements of the national standards or regulations in the
country of use with respect to effect on water quality.
Specifications:
1) The standard of pipe: ISO 2531, EN545 , EN598.
2) Pipe class: K9, C40, C30, C25, etc.
3) Pipe joint: push-on joint(Tyton joint), K type joint,
self-restrained joint
4) Effective length: in general, the pipe length is 6m for bulk
shipment and 5.7m for container shipment.
5) Rubber gasket materials shall conform to the requirements of ISO
4633 for water applications. When materials other than rubber are
necessary (e.g. high-temperature flanged joints), they shall
conform to the appropriate International Standards.
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
Packing: bundled with steel belts or in bulk
Shipment: in bulk or container
Mechnical behavior:
| Ductile cast iron pipe | Common ash cast pipe | Steel pipe |
| Tensile strength(MPa) | ≥420 | 150--260 | ≥400 |
| Ductility(%) | <1000(mm) | ≥10 | Neglected | ≥18 |
| >1000(mm) | ≥7 | Neglected | ≥18 |
| Brinell hardness(HBS) | ≤230 | ≤230 | about 140 |
| After annealing,the microstructure of ductile cast iron pipes is
ferrite and a little pearlite,possessing excellent mechanical
properties. |
Other performance:
| The hydraulic test pressure of the ductile cast iron pipes is as
follows: |
| Nominal diameter(mm) | Hydraulic test pressure(MPa) |
| 80≤DN≤300 | 5.0 |
| 350≤DN≤600 | 4.0 |
| 700≤DN≤1000 | 3.2 |
| 1100≤DN≤2000 | 2.5 |
Usage:
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.
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