... hollow sectionsize: 28*28, 38*38thickness: 0.8-1.2mmmaterial: q195-q235finishi: black annealedStandard: JIS, AISI, ASTM, GB, ... , machine,industry,Certification: ISOWelding Line Type: ERWThickness: 0.5mm-40mmOuter Diameter: 1.0mm-900mmProduct name: ASTM 304 ... standard toleranceShape: round,square,rectangularsurface: pickled, acid, polished, black,ectcertificate: ISO, BV, API, CSC,DNV,ectnormal length: ...