Mechanical and corrosion properties of super duplex stainless steel weldments

Martti Vilpas, Jouko Ruusila, Veli Kujanpää, Risto Karppi

    Research output: Book/ReportReport

    Abstract

    The report deals with the weldability of cast and rolled super duplex stainless steels (27 % Cr, 7 8 % Ni, 3 4 % Mo, 0.2 2.7 % Cu and 0,2 0,3 % N) with special reference to the mechanical and corrosion properties of welded joints. The test welds have been evaluated using metallography, mechanical testing as well as pitting and stress corrosion tests. The results indicate that the welded joints can exhibit acceptable joint properties when the type of consumable and the level of heat input are properly chosen. Matching type consumables with a heat input close to 10 15 kJ/cm yielded good results. Significantly lower heat inputs result in a lower weld metal austenite content and formation of nitrides in ferrite, resulting in reduced toughness. On the other hand, excessively high heat inputs tend to enhance various precipitation reactions, reducing HAZ toughness and corrosion resistance.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages98
    ISBN (Print)951-38-4453-6
    Publication statusPublished - 1993
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Tiedotteita - Meddelanden - Research Notes
    Number1519
    ISSN1235-0605

    Keywords

    • duplex steels
    • dual phase steels
    • weldments
    • welded joints
    • stainless steels
    • weldability
    • mechanical properties
    • corrosion tests
    • corrosion resistance
    • evaluation
    • pitting
    • metallography
    • toughness
    • stress corrosion

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  • Cite this

    Vilpas, M., Ruusila, J., Kujanpää, V., & Karppi, R. (1993). Mechanical and corrosion properties of super duplex stainless steel weldments. VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 1519