... Condenser and any other Pressure and Heat-exchanger Pipes. ASTM A249 is a standard about Welded Austenitic Stainless Steel ... BoilerSuperheater, Heat-Exchanger, and Condenser pipes/tubes.ASTM A249 standard covers nominal-wall-thickness welded stainless steel ... boiler, superheater, heat exchanger, or condenser tubes.According to ASTM A249, subsequent to welding and prior to final heat ...