... K8 3.ling according to ISO4179 iso 2531 ductile iron pipe Standard: JIS, AISI, ASTM, GB, DIN, ENPlace of Origin: TIANJIN ... toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC,DNV,ectnormal length: 1000mm,3000mm,6000mmprice: ... Process Method: cold drawn and cold rolled3.Standards:ASTM / ASME, GB, DIN, JIS, T14975, etc.4.Out Diameter: 6-830 ...