API 5L /ASTM A106 GR.B Carbon Steel Pipe Standard:API 5L,ASTM A106/A53 ... high quality SEAMLESS STEEL PIPES API 5L/ ASTM A106, GR.BStandardASTM A106/ASTM A 53 API 5L,GB/T8163-1999 ... /2391/17172, JIS 3461/3462, BS3059,BS1387 etc Material: Gr A, Gr B, X42, X52, X60,X80,10#,20#,35#,45 ... on two end of every pipe outer; hexagonal shape bundles wrapped with strong steel strip or customers' requests. Usage used ...