Based on a typical case of cracks appearing in the outlet pipeline of the reheater of a supercritical boiler during long-term operation,the SA-213TP347H steel pipe material used was subjected to macroscopic inspection,composition analysis,and microscopic structure inspection,revealing the fundamental cause of the cracks.The analysis results indicate that the formation of cracks is related to the mechanical fatigue and environmental induced corrosion experienced by the material in high temperature and high pressure environments.Based on the analysis results,reasonable material selection and equipment maintenance suggestions were proposed to improve equipment reliability and safety.
high temperature reheaterSA-213TP347H steel pipecause of cracks
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