Failure Analysis of TP347H Steel Superheater Tube in a Power Plant Boiler
This paper analyzes the failure reason of a TP347H steel superheater tube in a coal-fired power unit,through the macro inspection and analysis,chemical composition analysis,mechanical performance testing,microstructure analysis and EDS element analysis.The results show that the superheater tube is af-fected by the start-up and shutdown of the boiler,as well as significant fluctuations in load,leading to the formation of thermal fatigue cracks on the inner wall of the tube.As these micro-cracks rapidly initiated and expanded,it ultimately led to the pipe explosion.Finally,supervisory recommendations were provided from the perspective of unit maintenance and operation.
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