... Steel typeSteel gradeannual output/t1Oil casing Pipe, joint materialJ55,K55,N80-11000002Oil line pipe B,X42~X60(L245~L415) ... 50003high-pressure boiler tube20G50004lower/medium-pressure boiler tube10#,20#,A,B60005Transmission fluid ... P110850002Oil casing Pipe, joint materialJ55,N80,L80-1,C90,T95,P110,Q125,9Cr,13Cr2100003Line pipeB,X42~X80200004Transmission fluid tube10,20 ...