... ranged from DN80--DN12000 according to ISO2531-98 & EN545 Ductile Iron cast ironpipes used in potable water supply project, ranged from ... the manufacturer which produce water--cooled centrifugal casting ductile cast iron pipes according to ISO2531 and EN545 in China. we ... for easy connection.(7) High strength ,lighter than gray iron,good corrosion resistance,no furring,small flow resistance,easy fixing ...