... K7&K9&K8 3.ling according to ISO4179 iso 2531 ductile iron pipe Standard: JIS, AISI, ASTM, GB, DIN, ENPlace ... pressure steel prof...tolernace: normal standard toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC, ... stainless steel pipeeamless carbon steel pipe Packaging Detail:Export standard package, bundled or be required The inner size of ...