... 12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pipe, joint materialJ55,K55,N80-11000002Oil line pipeB,X42~ ... boiler tube20G50004lower/medium-pressure boiler tube10#,20#,A,B60005Transmission fluid tube10#,20#,Q295,Q345,Q390300006Structural use of seamless ... P110850002Oil casing Pipe, joint materialJ55,N80,L80-1,C90,T95,P110,Q125,9Cr,13Cr2100003Line pipeB,X42~X80200004Transmission fluid tube10, ...