Predictions as to 105 h creep rupture strength of grade 91 steel have been made recently. The predicted values are examined with long-term creep rupture data of the steel. Three creep rupture databases were used in the predictions: data of tube products of grade 91 steel reported in National Institute for Materials Science (NIMS) Creep Data Sheet (NIMS T91 database), data of T91 steel collected in Japan, and data of grade 91 steel collected by an American Society of Mechanical Engineers (ASME) code committee. Short-term creep rupture data points were discarded by the following criteria for minimizing overestimation of the strength: selecting long-term data points with low activation energy (multiregion analysis), selecting data points crept at stresses lower than a half of proof stress (σ0.2/2 criterion), and selecting data points longer than 1000 h (cutoff time of 1000 h). In the case of NIMS T91 database, a time–temperature parameter (TTP) analysis of a dataset selected by multiregion analysis can properly describe the long-term data points and gives the creep rupture strength of 68 MPa at 600 °C. However, TTP analyses of datasets selected by σ0.2/2 criterion and cutoff time of 1000 h from the same database overestimate the data points and predict the strength over 80 MPa. Datasets selected by the same criterion from the three databases provide similar values of the strength. The different criteria for data selection have more substantial effects on predicted values of the strength of the steel than difference of the databases.
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October 2017
Research-Article
A Postassessment Test of 100,000 h Creep Rupture Strength of Grade 91 Steel at 600 °C
K. Maruyama,
K. Maruyama
Department of Materials Science,
Graduate School of Engineering,
Tohoku University,
6-6-02 Aramaki-Aoba, Aoba-ku,
Sendai 980-8579, Japan
e-mail: kouichi.maruyama@tohoku.ac.jp
Graduate School of Engineering,
Tohoku University,
6-6-02 Aramaki-Aoba, Aoba-ku,
Sendai 980-8579, Japan
e-mail: kouichi.maruyama@tohoku.ac.jp
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N. Sekido,
N. Sekido
Department of Materials Science,
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
Search for other works by this author on:
K. Yoshimi
K. Yoshimi
Department of Materials Science,
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
Search for other works by this author on:
K. Maruyama
Department of Materials Science,
Graduate School of Engineering,
Tohoku University,
6-6-02 Aramaki-Aoba, Aoba-ku,
Sendai 980-8579, Japan
e-mail: kouichi.maruyama@tohoku.ac.jp
Graduate School of Engineering,
Tohoku University,
6-6-02 Aramaki-Aoba, Aoba-ku,
Sendai 980-8579, Japan
e-mail: kouichi.maruyama@tohoku.ac.jp
N. Sekido
Department of Materials Science,
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
K. Yoshimi
Department of Materials Science,
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
Graduate School of Engineering,
Tohoku University,
Sendai 980-8579, Japan
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 30, 2017; final manuscript received July 11, 2017; published online August 23, 2017. Editor: Young W. Kwon.
J. Pressure Vessel Technol. Oct 2017, 139(5): 051404 (7 pages)
Published Online: August 23, 2017
Article history
Received:
April 30, 2017
Revised:
July 11, 2017
Citation
Maruyama, K., Sekido, N., and Yoshimi, K. (August 23, 2017). "A Postassessment Test of 100,000 h Creep Rupture Strength of Grade 91 Steel at 600 °C." ASME. J. Pressure Vessel Technol. October 2017; 139(5): 051404. https://doi.org/10.1115/1.4037446
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