... 3.ling according to ISO4179 flange t joint ductile iron pipe Standard: JIS, AISI, ASTM, GB, DIN, ... toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC,DNV,ectnormal length ... decorations, railroad vehicles.Some seamless stainless steel pipe/tube which has excellent corrosion resistant, mechanical ... acceptable. flange t joint ductile iron pipe