... of structure low pressure, middle pressure boiler and locomotive boilerFluid pipe for transportation 10# 20# Q295ASTM A106A,B,CA53A,B16MnGB/T8163-2008ASTM A106ASTM A538-1240*1-200Seamless steel pipe for fluid transportStructure pipe10# 20# 45# 27SiMnASTM A53A,B16Mn ... -30Apply to structure support, low pressure fluid transportSpiral steel pipe Q235A-B Q345A-ESY/T5037-2000219-2820*4-20apply to ...