... ,gas and other common fluids.5, ASTM A179 For tubed heat exchanger and similar heat conveying equipments6, ... CrMoGB9948-8810-530*1.5-36Boiler pipes for refinery,heatexchangeing pipes,seamless steel pipes for pipelineHigh-pressureSeamless pipes for fertilizer making equipment20, 16Mn,Q345GB6479- ... pipe10,20GB3087-199910-530*2-40Over-heat pipe for low and medium pressure boiler,boilling water pipe, ...