... THICKNESS 6-25mm.LENGTH 6-12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pipe, joint material ... tube 10#,20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder ... 3.5-25mm,length 6-14.63m)No.Steel typeSteel gradeAnnual output/t1Oil casing Pipe, joint ... equipment10,20,16Mn,15Mnv,12CrMo,15CrMo9000 carbon seamless steel pipe