... WALL THICKNESS 6-25mm.LENGTH 6-12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pipe, joint materialJ55, ... Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder sleeve etc.45#,27SiMn20008pipes ... equipment10,20,16Mn,15Mnv,12CrMo,15CrMo90009Structural use of seamless steel tubes10,20,45,35CrMo,40Cr3500010Shipping use of tube320, ...