Experimental Fracture Failure Analysis of Superheater Water Pipe Boilers

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Superheater pipes in boilers generally experience failure due to extreme operating conditions, such as high temperatures and pressures, often leading to ruptures on the pipe surface. These failures reduce the boiler system’s efficiency and increase the risk of further, costly damage. Therefore, it is important to conduct a failure analysis on the ruptured pipe area to enhance the reliability and operational lifespan of the boiler superheater pipes. This study uses several methods to analyze superheater pipe failure, including visual observation and chemical composition testing, which showed a carbon content of 0.228%, classifying the material as low carbon steel. This was also confirmed by microstructure analysis. Hardness testing revealed an average hardness value of 140.9 HV, whereas the expected hardness should be around 180 HV. In the hardness test, there is a difference of 40 HV from the hardness value that meets the standard, which is an indication of material failure. Additionally, in the SEM test, fine defects were found along the grain, and the tested pipe that experienced rupture was already very thin, with many deposits found on the pipe walls.

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33-40

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June 2025

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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