... seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder sleeve etc.45#,27SiMn20008pipes for high-pressure fertilizer equipment20G,15MnV10009Shipping use ... )No.Steel typeSteel gradeAnnual output/t1Oil casing Pipe, joint materialJ55,N80,L80,C90,P110850002Oil casing Pipe, joint materialJ55,N80,L80-1,C90 ...