black steel pipe/carbon steel pipe OD: 21.3 to 610mm ... X52 X56 X60 X65 X70CertificateAPI5LEndPlain end,bevele,etc.SurfaceBare, varnished, black lacquer, Bitumen Coating, zinc coating, anti-corrosion coating, 3PE,FBE ... Max Length 18meters; Max Diameter 610mm;TestChemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Metallographic Test, Technical ...