carbon steel seamless pipe OD:60mm- ... ~X60(L245~L415)50003high-pressure boiler tube20G50004lower/medium-pressure boiler tube10#,20#,A,B60005Transmission fluid ... #,20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube, ... boiler tube20G,20MnG,25MnG,12Cr1MoVG,15CrMoG,P9145006lower/medium-pressure boiler tube10,20200007Hydraulic pillar tube20,30 ...