... are the first one that produces centrifugal casting ductile iron pipes according to ISO2531 and EN545 in China. ... year covering 17 sizes of DN80-1200mm. Material: Ductile iron(1) The standed: ISO2531-1998, EN545-2006, K9, ... 5) T-type(6) High strength, lighter than gray iron, good corrosion resistance, no furring, small flow resistance, ... pipes, such as galvanized steel pipe, stainless iron pipe, etc.