API 5L /ASTM A106 GR.B Carbon Steel Pipe Standard:API 5L,ASTM A106/A53, Size: ... Gr A, Gr B, X42, X52, X60,X80,10#,20#,35#,45#,ST35.4,ST37.4,ST52, A105,A106 ... on two end of every pipe outer; hexagonal shape bundles wrapped with strong steel strip or customers' requests. ... Usage used for conveyance gas ,water ,petroleum and conveyance of other fluid Container ...