... A) Our finned tube included bellowing materials:1) Aluminum extruded fin tube, base material is carbon steel SA179, or stainless ... nickel alloy C70600, C71500, C70400 and Brass C44300, C687004) Economizer fin tube, in material of carbon steel SA179, or stainless steel ... C70600, C71500, C70400 and Brass C44300, C687005) Serrated HRSG fin tubes6) Studed tubes7) Inner Grooved Tube in material of carbon ...