Finned Tubes for R&D, it can be made ... double material mixed A) Our finned tube included bellowing materials:1) Aluminum extruded fin tube, base material is carbon steel ... cooler, fired heater, heat exchanger, marine boiler, economizer, power plant boiler, HRSG boiler, waste heat recovery unit, air heater ... run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); finned tube