alloy hot-rolled 27SiMn tube OD:60-180mm WT:3.5-25 mm Material: 27SiMn Certification:GB/T19001-200... 1,Accu-roll unit(OD114—273mm. WALL THICKNESS 6-25mm.LENGTH 6-12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pip, joint materialJ55,K55,N80-11000002Oil line pipeB,X42~X60(L245~L415)50003high-pressure boiler tube20G50004lower/medium-pressure boiler tube10#,20#,A,B60005Transmission fluid ...