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

Kim Wallin

    Research output: Book/ReportReport

    Abstract

    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
    Number216
    ISSN1235-0621

    Fingerprint

    High strength steel
    Toughness
    Steel
    Ferritic steel
    Superconducting transition temperature
    Fracture toughness
    Geometry
    Temperature

    Keywords

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

    Cite this

    Wallin, K. (1995). Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 216
    Wallin, Kim. / Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. Espoo : VTT Technical Research Centre of Finland, 1995. 56 p. (VTT Publications; No. 216).
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    Wallin, K 1995, Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. VTT Publications, no. 216, VTT Technical Research Centre of Finland, Espoo.

    Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. / Wallin, Kim.

    Espoo : VTT Technical Research Centre of Finland, 1995. 56 p. (VTT Publications; No. 216).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels

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    AB - 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.

    KW - steels

    KW - mechanical properties

    KW - strength

    KW - testing

    KW - validation

    KW - toughness

    KW - stress

    KW - plasticity

    KW - fracture strength

    KW - Charpy impact tests

    M3 - Report

    SN - 951-38-4654-7

    T3 - VTT Publications

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

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    Wallin K. Validation of methodology for selecting Charpy toughness criteria for old thin low strength steels. Espoo: VTT Technical Research Centre of Finland, 1995. 56 p. (VTT Publications; No. 216).