carbon steel seamless pipe OD:60mm-273mm WT:3.5mm-25mm Standard:ASTM,DIN,API,JIS etc... Place of Origin: ... 20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, cylinder sleeve etc.45#,27SiMn20008pipes ... fertilizer equipment10,20,16Mn,15Mnv,12CrMo,15CrMo90009Structural use of seamless steel tubes10,20,45,35CrMo,40Cr3500010Shipping use of ...