... Liquid Transportation10,20,Q345 etcGB/T81633High Pressure Boiler Tube20G,12Cr1MoVG,20MnG,25MnG,15Cr1MoVGGB53104Low and Medium Pressure Boiler Tube10,20GB30875High pressure Pipe for Fertilizer Equipment10,20 ... include: Low/medium pressure boiler pipe, high pressure boiler pipe, alloy pipe, marine pipe, hollow sucker rod, oil cracking tube, tubing, American standard tube, European standard tube, etc ...