Causes Analysis on Bursting of T92Steel Tube of Finishing Superheater in Ultra Supercritical Boiler

By means of visual observation,chemical compositions analysis,metallographic examination andmechanical properties testing,the bursting causes for T92steel tube of finishing superheater in ultra supercriticalboiler were analyzed.The results show that the tube-bursting was due to long term overheat,as a result of a littleoxide skin peeling-off from the local position of inner wall of the tube.Preventive measures were proposed in view ofthe bursting reasons.