... THICKNESS 6-25mm.LENGTH 6-12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pipe, joint material J55,K55,N80-11000002Oil line ... ,B60005Transmission fluid tube 10#,20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder sleeve etc ... high-pressure fertilizer equipment10,20,16Mn,15Mnv,12CrMo,15CrMo9000 carbon seamless steel pipe