Mechanical and corrosion properties of welded joints in new generation ferritic and duplex stainless steels

Mika Sirén, Pekka Pohjanne, Veli Kujanpää, Justus Hirn, Jyrki Romu, Hannu-Pekka Heikkinen

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    This study covers the very preliminary results of welding and characterisation of one novel duplex and two ferritic stainless steel grades. The so-called "lean duplex" grade EN 1.4162 (UNS S32101) has 21.5% Cr- 5% Mn-1.5% Ni- N, the ferritic EN 1.4509 (UNS S43940, AISI 441) 17% Cr, and the other, improved 21% Cr ferritic grade that fulfills also UNS S44330 standard requirements, but has no standard EN designation yet. Both ferritic stainless steels have low (<0.02%) carbon content and double (Nb+Ti) stabilisation. The materials were used as 1.5 and 2 mm sheets, hence laser and resistance spot welding were selected for welding experiments. The joints were subjected to mechanical testing and critical pitting temperature (CPT) corrosion tests, which were performed on both the base materials and welds. The mechanical tests of the welds did not reveal any significant softening effect due to welding operations. Comprehensive CPT data were achieved for base materials and their welds using two different polarisation potentials, and the new 21% Cr ferritic grade shows a great promise in both as-received and welded conditions. This paper was written as part of the Finnish Metals and Engineering Competence Cluster (FIMECC)'s Demanding Applications (DEMAPP) program.
    Original languageEnglish
    Pages (from-to)1003-1008
    Number of pages6
    JournalMaterials Science Forum
    Volume783-786
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    welded joints
    Stainless Steel
    welding
    stainless steels
    grade
    corrosion
    Welding
    Welds
    Stainless steel
    Ferritic steel
    mechanical properties
    Corrosion
    Pitting
    ferritic stainless steels
    pitting
    Resistance welding
    Spot welding
    Mechanical testing
    Application programs
    corrosion tests

    Keywords

    • stainless steel
    • ferritic
    • lean duplex
    • welding
    • corrosion
    • laser welding

    Cite this

    Sirén, Mika ; Pohjanne, Pekka ; Kujanpää, Veli ; Hirn, Justus ; Romu, Jyrki ; Heikkinen, Hannu-Pekka. / Mechanical and corrosion properties of welded joints in new generation ferritic and duplex stainless steels. In: Materials Science Forum. 2014 ; Vol. 783-786. pp. 1003-1008.
    @article{03d38468c6c6415a945cb68d8b8e5ce4,
    title = "Mechanical and corrosion properties of welded joints in new generation ferritic and duplex stainless steels",
    abstract = "This study covers the very preliminary results of welding and characterisation of one novel duplex and two ferritic stainless steel grades. The so-called {"}lean duplex{"} grade EN 1.4162 (UNS S32101) has 21.5{\%} Cr- 5{\%} Mn-1.5{\%} Ni- N, the ferritic EN 1.4509 (UNS S43940, AISI 441) 17{\%} Cr, and the other, improved 21{\%} Cr ferritic grade that fulfills also UNS S44330 standard requirements, but has no standard EN designation yet. Both ferritic stainless steels have low (<0.02{\%}) carbon content and double (Nb+Ti) stabilisation. The materials were used as 1.5 and 2 mm sheets, hence laser and resistance spot welding were selected for welding experiments. The joints were subjected to mechanical testing and critical pitting temperature (CPT) corrosion tests, which were performed on both the base materials and welds. The mechanical tests of the welds did not reveal any significant softening effect due to welding operations. Comprehensive CPT data were achieved for base materials and their welds using two different polarisation potentials, and the new 21{\%} Cr ferritic grade shows a great promise in both as-received and welded conditions. This paper was written as part of the Finnish Metals and Engineering Competence Cluster (FIMECC)'s Demanding Applications (DEMAPP) program.",
    keywords = "stainless steel, ferritic, lean duplex, welding, corrosion, laser welding",
    author = "Mika Sir{\'e}n and Pekka Pohjanne and Veli Kujanp{\"a}{\"a} and Justus Hirn and Jyrki Romu and Hannu-Pekka Heikkinen",
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    Mechanical and corrosion properties of welded joints in new generation ferritic and duplex stainless steels. / Sirén, Mika; Pohjanne, Pekka; Kujanpää, Veli; Hirn, Justus; Romu, Jyrki; Heikkinen, Hannu-Pekka.

    In: Materials Science Forum, Vol. 783-786, 2014, p. 1003-1008.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Sirén, Mika

    AU - Pohjanne, Pekka

    AU - Kujanpää, Veli

    AU - Hirn, Justus

    AU - Romu, Jyrki

    AU - Heikkinen, Hannu-Pekka

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    KW - stainless steel

    KW - ferritic

    KW - lean duplex

    KW - welding

    KW - corrosion

    KW - laser welding

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    JO - Materials Science Forum

    JF - Materials Science Forum

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    ER -