alloy hot-rolled 27SiMn tube OD:60-180mm WT:3.5-25 mm Material: 27SiMn Certification:GB/T19001-200... 1,Accu- ... of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder sleeve etc.45#,27SiMn20008pipes for high-pressure fertilizer ... Steel typeSteel gradeAnnual output/t1Oil casing Pipe, joint materialJ55,N80,L80,C90,P110850002Oil casing Pipe, joint materialJ55,N80,L80-1,C90 ...