seamless pipe O.D.: 6mm-114m W.T.:1mm-20mm seamless ... AISI, ASTM A53, GB, DIN1629, EN,etc.APPLICATION:mechanical structure,heat exchange,structure,machinery,liquid transportation,etc.MATERIAL:GB/T 8162,10 ... A53 GR.B,ALL PIPES ARE WITH BLACK COATING, PIPE ENDS ARE BEVELLED FROM 2 INCH AND ABOVE, AND ... ALL PIPE ENDS ARE WITH ENDING PROTECTOR1/221.32.7761511103/426. ...