... Austenitic Stainless Steel BoilerSuperheater, Heat-Exchanger, and Condenser pipes/tubes.ASTM A249 standard covers nominal-wall-thickness welded stainless steel ... such use as boiler, superheater, heat exchanger, or condenser tubes.According to ASTM A249, subsequent to welding and prior to ... final heat treatment, the stainless steel pipes/tubes shall be cold worked either in both weld and base ...