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

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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.
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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.",
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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 - Pohjanne, Pekka

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N2 - 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.

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KW - corrosion

KW - laser welding

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