The development of large-scale steam-electric powder line makes greater technical demands. On the choice and application of the main material for the high pressure boiler.It is measured by this thesis that the chemical composition, mechanical property, microstructure and sustained strength of T23 steel tube.It is done that the age test and mechanical property, microstructure measure of the base metal and manual argon arc welding joint of T23 steel tube after aging ,meanwhile, the high temperat...