... material mixed A) Our finned tube included bellowing materials:1) Aluminum extruded fin tube, base material is carbon steel SA179 ... C70600, C71500, C70400 and Brass C44300, C687004) Economizer fin tube, in material of carbon steel SA179, or stainless steel ... air cooler, fired heater, heat exchanger, marine boiler, economizer, power plant boiler, HRSG boiler, waste heat recovery unit, air heater etc ...