carbon steel seamless pipe OD:60mm-273mm WT:3.5mm-25mm Standard:ASTM,DIN, ... #,20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder sleeve etc.45#,27SiMn20008pipes for high ... 3.5-25mm,length 6-14.63m)No.Steel typeSteel gradeAnnual output/t1Oil casing Pipe, joint materialJ55,N80,L80,C90,P110850002Oil casing ...