carbon steel seamless pipe OD:60mm-273mm WT:3.5mm-25mm Standard:ASTM,DIN, ... THICKNESS 6-25mm.LENGTH 6-12.2m)No.Steel typeSteel gradeannual output/t1Oil casing Pipe, joint materialJ55,K55,N80-11000002Oil line pipeB ... ,12CrMo,15CrMo90009Structural use of seamless steel tubes10,20,45,35CrMo,40Cr3500010Shipping use of tube320,360,410,4609000 Total 450000 API carbon steel tube