ductile iron pipe 1) The standard of pipe: ISO 2531 - 1998, EN545-2002 , K9
2) Effective length: 6M when using bulk shipment way, or about 5.5M or 5.7M when
in 20' container shipment way
3) Inner cement line: Portland cement lining as per ISO4179
4) Zinc coating: at least 130gsm as per ISO 8179
5) Bitumen painting: at least 70um as per ISO 8179
6) Gaskets are NBR rubber, natural rubber, SBR rubber or EPDM rubber
tightness ring as per ISO4633
7) DN 80 - 1, 200 mm
8) High strength, lighter than gray iron, good corrosion resistance, no furring,
small flow resistance, easy fixing, long life time
9) Checked by automatic inspection equipment
10) Composition:
a) C: 3.4 - 3.7%
b) Si: 2.0 - 2.4%
c) P: < 0.08%
d) S: < 0.015
11) Pull strength: >420MPa
12) Yield: >10%
13) Hardness: < 230HB
14) Process and testing:
a) Blast furnace (Analysis of raw materials test )
b) Mg treatment (Micro & chemical composition test)
c) Pipe spinning (Temperature test)
d) Heat treatment (Micro structure; Flattening test)
e) Zinc coating (Thickness testing)
f) Dimensional checks (Thickness & Dia. testing)
g) Hydraulic test (Pressure test)
h) Internal lining (Thickness testing)
i) External coating (Thickness test)
