... etcGB/T81633High Pressure Boiler Tube20G,12Cr1MoVG,20MnG,25MnG,15Cr1MoVGGB53104Low and Medium Pressure Boiler Tube10,20GB30875High pressure ... ,45,27SiMnGB/T173969American Standard PipeA,BASTM A106 ASTM A5310Casing and TubingJ55,K55,N80,L80,T95, ... boiler pipe, high pressure boiler pipe, alloy pipe, marine pipe, hollow sucker rod, oil cracking tube, tubing, American standard tube, European standard tube ...