... 20, 12CrMo,15CrMo, Cr5Mo, Cr9Mo GB9948-8810-530*1.5-36Boiler pipes for refinery,heatexchangeing pipes,seamless steel ... and small)Fluid pipe20, Q345GB/T8163-19998-630*1.0-40Fluid feedingStructural pipe10,20,35,45, 16Mn, ... Q345BGB/T8162-19996-1020*1.5-100For commom structureLine pipeGr..BAPI5 L/CT21.3 ... -914*1.5-120Carrying gas,water or oil in the ...