Burst Causes for Superheater Tube of a Tank Auxiliary Boiler

The chemical composition analysis, mechanical properties testing and microstructure observing were done for a burst superheater tube in a tank auxiliary boiler to find burst causes. The results show that pearlite spheroidization and serious creep damage happened in the tube matrix due to a long time superheating, and the deposit on inner-wall of the superheater tube made superheat aggravate and promote burst.