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By certification 
The ASTM A249 specification covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes made from the austenitic steels. More specifically, the ASTM A249 specification is intended for uses such as
Boiler
Superheater
heat exchanger
condenser tubes
be furnished in the heat-treated condition in accordance with the required solution temperature and quenching method. conform to the prescribed tensile and hardness properties such as tensile strength, yield strength, elongation, and Rockwell hardness number.
undergo mechanical tests such as tension test, flattening test, reverse-bend test, hardness test, and hydrostatic or nondestructive test.
Boiler
Superheater
heat exchanger
condenser tubes
be furnished in the heat-treated condition in accordance with the required solution temperature and quenching method. conform to the prescribed tensile and hardness properties such as tensile strength, yield strength, elongation, and Rockwell hardness number.
undergo mechanical tests such as tension test, flattening test, reverse-bend test, hardness test, and hydrostatic or nondestructive test.
