ASTM A 249

This guide specifies standard specification fornominal-wall-thickness welded tubes and heavily cold worked welded tubes madefrom the austenitic steels with various grades intended for such use as aboiler, superheater, heat exchanger, or condenser tubes. Heat and productanalysis shall conform to the requirements as to chemical composition forcarbon, manganese, phosphorous, sulfur, silicon, chromium, nickel, molybdenum,nitrogen, copper, and others. All materials shall be furnished in theheat-treated condition in accordance with the required solution temperature andquenching method. When the final heat treatment is in a continuous furnace, thenumber of tubes of the same size and from the same heat in a lot shall bedetermined from the prescribed size of the tubes. The material shall conform tothe prescribed tensile and hardness properties such as tensile strength, yieldstrength, elongation, and Rockwell hardness number. The steel shall undergomechanical tests such as tension test, flattening test, flange test,reverse-bend test, hardness test, and hydrostatic or nondestructive electrictest. The grain size of different grades of steel shall be determined inaccordance with the test methods.