... :200/300/400 Seamless.welded,hot rolled,col large diameter seamless stainless steel pipeStandard: JIS, AISI, ASTM ... normal standard toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC,DNV, ... Ultrasonic InspectionMill Test Certificate is supplied with shipment, Third Part Inspection is acceptable. large diameter seamless stainless steel pipe