We have produced ISO2531/EN545/EN598 zinc coated ductile pipe for more than 15 years.
By now we have exported our ductile iron pipes to many countries such as Italy, New Zealand, Syria, Iraq, Singapore,etc. Our annual production capacity is about 500000 tons. Our production equipments include high advanced electric furnace, anealing furnace, zinc spraying machine, hydraulic test machine,etc.
Composition and class
Metallurgical composition of ductile iron shall confirm to the following requirements (ISO):
3.5% to 3.9% Carbon
1.8% to 2.6% Silicon
Minimum tensile strength: 420(MPa) for pipes
Minimum elastic limits: 300(MPa) for pipes
Minimum elongation at failure: 10% for pipes
Maximum hardness: 230(HB) for pipes
The pipes of class K9 shall be subject to hydrostatic pressure test in the factory as follows:
DN80 to DN300:50 bars
DN350 to DN600:40 bars
DN700 to DN800: 32 bars
The pipes shall be internally lined with portland cement mortar. The thickness and the lines shall be in accordance with ISO 4179(1985).The lining shall be applied centrifugally.
The pipes shall be externally coated in the factory with a metallic zinc coat as primer and a black bituminous or black coal tar based anticorrosive varnish in accordance to ISO 8179(1995). The zinc coat shall be applied by arc gun and the bituminous/tar based coat by an airless gun in at least 2 layers.
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