Modeling of creep rupture strength and stress reduction factors for welded 9% Cr steel

Stefan Holmström, Pertti Auerkari

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Preferred models for creep rupture strength prediction have been evaluated for the parent and cross-weld steel E911, intended for use in headers and steam lines of power plants up to about 600°C. The assessment of the rupture data was performed in accordance with the Guidelines of the ECCC (European Creep Collaborative Committee), using the procedure and models of the standard PD6605. Rupture strength was predicted to a maximum extrapolation time of 160 000 h for the parent material and 50 000 h for the welds. The estimated stress reduction factor (SRF) for welded E911 at 600ºC was about 80% for a rupture life of 21 000 h, and about 70% for a rupture life of 50 000 h. However, the predicted decrease in SRF for longer time and higher temperatures may be exaggerated due to limited long-term cross-weld data.
    Original languageEnglish
    Title of host publicationBALTICA V
    Subtitle of host publicationCondition and Life Management for Power Plants
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages621-634
    Volume2
    ISBN (Electronic)951-38-5717-4
    ISBN (Print)951-38-5716-6
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    EventBALTICA V - Condition and Life Management for Power Plants - Porvoo, Finland
    Duration: 6 Jun 20018 Jun 2001

    Publication series

    SeriesVTT Symposium
    Number212
    ISSN0357-9387

    Conference

    ConferenceBALTICA V - Condition and Life Management for Power Plants
    Abbreviated titleBaltica V
    CountryFinland
    CityPorvoo
    Period6/06/018/06/01

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  • Cite this

    Holmström, S., & Auerkari, P. (2001). Modeling of creep rupture strength and stress reduction factors for welded 9% Cr steel. In BALTICA V: Condition and Life Management for Power Plants (Vol. 2, pp. 621-634). VTT Technical Research Centre of Finland. VTT Symposium, No. 212