... /T5310 GB/T3639-2000DIN2391 DIN1629/4 DIN1626 DIN1629/3 DIN17175 DIN EN10305ASTMA106-2006 ASTMA179-1999 Material10#, 20#, 45#, 16Mn, 30CrMo, Q345 ... /T5310 GB/T3639-2000DIN2391 DIN1629/4 DIN1626 DIN1629/3 DIN17175 DIN EN10305ASTMA106-2006 ASTMA179-1999 Material10#, 20#, 45#, 16Mn, 30CrMo, Q345 ... any thing I can help you, please contact with me! DIN 2391 precision seamless steel pipe