... --DN1400 2. K7&K9&K8 3.ling according to ISO4179 flange t joint ductile iron pipe Standard: JIS, AISI, ASTM, GB ... : ASTM 304 High pressure steel prof...tolernace: normal standard toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API ... Certificate is supplied with shipment, Third Part Inspection is acceptable. flange t joint ductile iron pipe