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