black steel pipe/carbon steel pipe OD: 21.3 to ... X65 X70CertificateAPI5LEndPlain end,bevele,etc.SurfaceBare, varnished, black lacquer, Bitumen Coating, zinc coating, anti-corrosion ... packed as customers’ special requirementsApplication- line pipe for use in pipeline transportation systems in ... in the construction of chemical plant, vessels, pipe work and for general mechanical engineering purposes;- ...