We produce centrifugal casting ductile iron pipes according to ISO2531 and EN545 in China.. ... thousand tons per year covering 17 sizes.Material: Ductile iron(1) The standard: ISO2531-1998, EN545-2006, Class ... ) T type(7) High stength, lighter than gray iron, good corrosion resistance, no furring, small flow resistance, ... .(8) Checked by automatic inspection equipment. ductile iron pipe,piping,sewer pipe