... ~L415)50003high-pressure boiler tube20G50004lower/medium-pressure boiler tube10#,20#,A,B60005Transmission fluid tube10#,20#,Q295,Q345,Q390300006Structural use of seamless steel tubes10 ... -pressure boiler tube10,20200007Hydraulic pillar tube20,30,45,27SiMn225008pipes for high-pressure fertilizer equipment10,20,16Mn,15Mnv,12CrMo,15CrMo90009Structural use of seamless ...