GB/T9711-2011 L390N/X56N PSL2 LSAW pipeline is mainly used in the fields of natural gas,petroleum,chemical engineering,electric power, metallurgy thermodynamics,water supply engineering,steam heating, hydropower station and long-distance pipeline project.L390N X56N PSL2 LSAW pipeline's surface can painted black paint, asphalt coating, galvanized, anticorrosive coating, 3PE, FBE, Epoxy, cement mortar, according to customer requirements.