... line pipe B,X42~X60(L245~L415)50003high-pressure boiler tube20G50004lower/medium-pressure boiler tube10#,20#,A,B60005Transmission fluid tube10#,20#,Q295 ... ,Q345,Q390300006Structural use of seamless steel tubes10#~45#,40Mn2,35Cr,35CrMo500007Hydraulic pillar tube ...