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

    Keywords

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

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