Journal of Mechanical Science and Technology

, Volume 33, Issue 11, pp 5243–5250 | Cite as

Degradation and reduction of small punch creep life of service-exposed Super304H steel

  • Thi Giang Le
  • Kee Bong YoonEmail author
  • Tae Min Jeong


To ensure the safety and structural integrity of a power boiler in thermal power plants, residual life management of superheater tubes at elevated temperature is needed. Over the decades, small punch (SP) creep testing has been widely used as an effective method for measuring creep life and creep properties of the boiler tube materials. In this study, a series of SP creep tests were performed at 650 °C with virgin and service-exposed Super304H stainless steels. The service period was 54750 h and 68550 h, respectively. The residual creep rupture life of the 68550 h serviced Super304H material decreased significantly when it was compared with the virgin and 54750 h serviced materials. Coarsening of the M23C6 precipitates along the grain boundaries made the adjacent region Cr-depleted, which could accelerate the formation of creep cavities at the grain boundaries. These microstructural degradations reduced the creep rupture life of the service-exposed materials. The Larson–Miller curve and the Monkman–Grant relationship were applied to predict the creep rupture life of service-exposed Super304H steels from the measured short creep rupture data.


Super304H Small punch creep Creep life Precipitate Degradation Superheater tube 



Small punch creep coefficient

Small punch creep exponent


Monkman Grant constant


Larson Miller constant


Larson Miller parameter


Small punch load


Time to rupture (in hours)


Temperature (in Kelvin)


Minimum punch-displacement rate


Monkman-Grant exponent for small punch creep


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This work was supported by a Korea Institute of Energy Technology Evaluation and Planning (KETEP) [grant number 2014 1010101850] funded by the Ministry of Trade, Industry and Energy (MOTIE). This study was also supported by a KETEP [grant number 2016 1110100090] funded by the MOTIE.


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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.Graduate School, Department of Mechanical EngineeringChung-Ang UniversitySeoulKorea
  2. 2.Department of Mechanical EngineeringChung-Ang UniversitySeoulKorea

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