... B60005Transmission fluid tube 10#,20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder ... 63m)No.Steel typeSteel gradeAnnual output/t1Oil casing Pipe, joint material J55,N80,L80,C90,P110850002Oil casing Pipe, joint material J55,N80,L80-1 ... -pressure fertilizer equipment10,20,16Mn,15Mnv,12CrMo,15CrMo9000 carbon seamless steel pipe