... the first one that produces centrifugal casting ductile iron pipes according to ISO2531 and EN545 in ... the first one that produces centrifugal casting ductile iron pipes according to ISO2531 and EN545 in China ... per year covering 17 sizes.Material:Ductile iron(1) The standed:ISO2531-1998,EN545-2006 ... type(7) High strength ,lighter than gray iron,good corrosion resistance,no furring,small flow resistance, ...