Cause of Leakage on HR3C Stainless Steel Final Superheater Tube of Boiler

YIN Xiaoshuang; SHEN Kang; LIU Changfu; DU Shuangming; DONG Shuqing

doi:10.11973/lhjy-wl202105012

PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2021 > 57(5): 50-53,58. > DOI: 10.11973/lhjy-wl202105012

YIN Xiaoshuang, SHEN Kang, LIU Changfu, DU Shuangming, DONG Shuqing. Cause of Leakage on HR3C Stainless Steel Final Superheater Tube of Boiler[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2021, 57(5): 50-53,58. DOI: 10.11973/lhjy-wl202105012

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Cause of Leakage on HR3C Stainless Steel Final Superheater Tube of Boiler

Institute of Thermal Power Generation Technology, China Datang Corporation Science and Technology Research Institute, Beijing 100040, China

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Received Date: May 13, 2020

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The final superheater tube of an ultra supercritical boiler leaked. The causes of leakage on superheater tube were analyzed by means of macro observation, chemical composition analysis, mechanical property test, metallographic examination and energy spectrum analysis. The results show that there were intergranular oxidation and original inner fold defects in the material of HR3C stainless steel final superheater tube, which were not detected by water immersion ultrasonic detection. During operation, stress concentration and crack source generated at the defect, and the crack propagated along the defect under the action of alternating stress during rolling, finally resulted in tube wall leakage.
- HR3C stainless steel,
- final superheater,
- intergranular oxidation,
- inner fold defect,
- leakage

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