... 6-12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pipe, joint material J55,K55,N80-11000002Oil line pipeB,X42~X60 ... .Steel typeSteel gradeAnnual output/t1Oil casing Pipe, joint material J55,N80,L80,C90,P110850002Oil casing Pipe, joint material J55,N80,L80-1 ... ,C90,T95,P110,Q125,9Cr,13Cr2100003Line pipe B,X42~X80200004Transmission fluid tube 10,20,Q295,Q345350005high-pressure ...