carbon black steel pipe supplier /manufacturer OD: 21.3 to 610mm WT: ... .8 -14.27mm standard:API steel grade:X60 Product name carbon black steel pipe supplier/manufacturerOut Diameter21.3mm-610mmWall Thickness0.8mm-14 ... end,bevele,etc.SurfaceBare, varnished, black lacquer, Bitumen Coating, zinc coating, anti-corrosion coating, 3PE,FBE,Epoxy, Cement Mortar, as per customer ...