carbon black steel pipe supplier /manufacturer OD ... standard:API steel grade:X60 Product name carbon black steel pipe supplier/manufacturerOut Diameter21.3mm-610mmWall ... X65 X70CertificateAPI5LEndPlain end,bevele,etc.SurfaceBare, varnished, black lacquer, Bitumen Coating, zinc coating, anti-corrosion ... concrete piles; - predominantly used in the construction of chemical plant, vessels, pipe work and for ...