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Creep strength and material degradation of heat-resistant steel were discussed, focusing on microstructural changes during long-term creep exposure. For determining the allowable stress, the 100,000h creep rupture strength should be evaluated based on creep rupture data. The selection of TTP and dividing the creep rupture data set are important to evaluate long-term creep strength when creep strength degradation occurs in the long term. In order to establish the allowable stress, minimum creep strength must also be evaluated. The minimum creep strength depends on the standard error of estimate (SEE) for creep rupture data. If the heat-to-heat variation of creep strength is large even for the same material specification, the value of SEE is estimated to be large. Therefore, it is important to clarify the reason for the heat-to-heat variation of creep strength in terms of microstructural changes and chemical compositions.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: heat-resistant steels, long-term creep, microstructural changes, heat-to-heat variation

Date published: 2026-09-01

Publisher: The Japan Institute of Metals and Materials

Journal:

• MATERIALS TRANSACTIONS (ISSN: 13459678) vol. 67 issue. 9 MT-M2026047

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2320/matertrans.mt-m2026047

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Updated at: 2026-08-25 13:46:20 +0900

Published on MDR: 2026-08-25 16:27:38 +0900