Creep Remaining-Life Assessment of 2.25Cr-1Mo Steel Hot Reheat Steam Piping by Small Punch Test

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  • Murakami Kotaro
    Graduate School of Science and Engineering, Kagoshima University
  • Komazaki Shin-ichi
    Research Field in Engineering, Science and Engineering Area, Research and Education Assembly, Kagoshima University
  • Mitsueda Toshiki
    Research & Development Department, Hokkaido Electric Power Co., Inc.

Bibliographic Information

Other Title
  • スモールパンチ試験による2.25Cr-1Mo鋼製高温再熱蒸気管のクリープ余寿命評価
  • スモールパンチ シケン ニ ヨル 2.25Cr-1Mo コウセイ コウオン サイネツ ジョウキカン ノ クリープ ヨ ジュミョウ ヒョウカ

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Abstract

<p>In order to investigate the adaptability of small punch (SP) creep testing technique to the remaining-life assessment, the SP creep test was carried out with 2.25Cr-1Mo steel hot rehear steam piping, which had been actually used in a fossil power plant for long periods of time. The SP load (F) was converted to the stress (σ) by three different equations, which were derived based on the displacement to maximum load in the SP test (um) and the deflection to minimum deflection rate in the SP creep test (umin) for correlating the SP creep rupture data with the uniaxial ones. The experimental results showed that the SP creep rupture time of specimen removed at around outer surface of piping tended to be slightly shorter than those taken at around inner surface and center. It was also found that the SP creep rupture data were relatively in good agreement with the uniaxial ones by converting F to σ with the equations, and the creep remaining-life was well predicted by the extrapolation of short-term SP creep rupture data. The highest prediction accuracy was obtained by using the equation derived from the SP test result, that is, um. Consequently, it was confirmed that the SP testing technique could be a strong tool for creep remaining-life assessment of boiler piping.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 108 (1), 88-96, 2022

    The Iron and Steel Institute of Japan

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