Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels

Kim Wallin

    Research output: Book/ReportReport


    A methodology for selecting the minimum usage temperature for ferritic steels has previously been developed. The methodology is based on the statistical correlation between fracture toughness and Charpy-V, and has been verified for modern extra high strength steels. Here, the methodology is verified experimentally with different test geometries for old (post Second World War quality) thin low strength steels. Based upon the investigations the following can be concluded: 1. The validation of the methodology as a whole appears successful. 2. The methodology seems capable of producing reliable "best" and "safe" estimates with equal accuracy. 3. Compared to extra high strength steels, the methodology shows a tendency to treat low strength steel somewhat more conservatively, but not unrealistically. 4. The methodology appears superior to all previous similar methodologies. 5. The results show that a single transition temperature toughness requirement of 28/27 J can well be applied for these types of old steels. 6. For the first time it is possible to develop rules that treat low and high strength steels impartially and are capable of giving accurately defined safety levels for different situations.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages56
    ISBN (Print)951-38-4654-7
    Publication statusPublished - 1995
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Publications


    • steels
    • mechanical properties
    • strength
    • testing
    • validation
    • toughness
    • stress
    • plasticity
    • fracture strength
    • Charpy impact tests


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