Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution

Heikki Leinonen, Pekka Pohjanne, K.R. Chasse, P.M. Singh, J. Romu, T. Saukkonen, H. Hänninen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

Stress corrosion cracking (SCC) susceptibility of the duplex stainless steels E 1.4162 (U S S32101) and E 1.4462 (U S S32205) was evaluated with U-bend specimens in the alkaline sulfide solution containing 100 g/l aOH and 55 g/l a 2S. Complementary potentiodynamic measurements were used to evaluate the effect of alloy composition on corrosion and on passivation behavior of the duplex stainless steels. The reference material in the study was the austenitic stainless steel E 1.4301 (U S S30400). Based on separate potentiodynamic curves and the free corrosion potential measurements of the alloys during the SCC tests, it is evident that Cr and i as the main alloying elements in duplex stainless steels raised the corrosion potential and lowered the critical current density of the steel, thus improving SCC resistance. Based on the potentiodynamic curves the alloying elements Mo and Mn were highly active in the hot caustic solution. SCC in the austenitic reference stainless steel was severe penetrating in the unaffected material but in the duplex stainless steels cracking was observed only inside the affected surface layer. Selective dissolution of Fe, Cr, Mn and Mo and/or enrichment of i and Cr as well as a, S and O took place in the affected surface layers of the duplex stainless steels depending on the steel grade
Original languageEnglish
Title of host publicationCorrosion conference and expo 2012
Pages5780-5800
Volume7
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
EventCorrosion conference and expo 2012: NACE International corrosion 2012 conference and expo - Salt Lake City, United States
Duration: 11 Mar 201215 Mar 2012

Publication series

SeriesNACE - International Corrosion Conference Series
ISSN0361-4409

Conference

ConferenceCorrosion conference and expo 2012
Abbreviated titleCORROSION2012
CountryUnited States
CitySalt Lake City
Period11/03/1215/03/12

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Stress corrosion cracking
Stainless steel
Chemical analysis
Alloying elements
Corrosion
Steel
Austenitic stainless steel
Passivation
Sulfides
Dissolution

Cite this

Leinonen, H., Pohjanne, P., Chasse, K. R., Singh, P. M., Romu, J., Saukkonen, T., & Hänninen, H. (2012). Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution. In Corrosion conference and expo 2012 (Vol. 7, pp. 5780-5800). NACE - International Corrosion Conference Series
Leinonen, Heikki ; Pohjanne, Pekka ; Chasse, K.R. ; Singh, P.M. ; Romu, J. ; Saukkonen, T. ; Hänninen, H. / Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution. Corrosion conference and expo 2012. Vol. 7 2012. pp. 5780-5800 (NACE - International Corrosion Conference Series).
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title = "Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution",
abstract = "Stress corrosion cracking (SCC) susceptibility of the duplex stainless steels E 1.4162 (U S S32101) and E 1.4462 (U S S32205) was evaluated with U-bend specimens in the alkaline sulfide solution containing 100 g/l aOH and 55 g/l a 2S. Complementary potentiodynamic measurements were used to evaluate the effect of alloy composition on corrosion and on passivation behavior of the duplex stainless steels. The reference material in the study was the austenitic stainless steel E 1.4301 (U S S30400). Based on separate potentiodynamic curves and the free corrosion potential measurements of the alloys during the SCC tests, it is evident that Cr and i as the main alloying elements in duplex stainless steels raised the corrosion potential and lowered the critical current density of the steel, thus improving SCC resistance. Based on the potentiodynamic curves the alloying elements Mo and Mn were highly active in the hot caustic solution. SCC in the austenitic reference stainless steel was severe penetrating in the unaffected material but in the duplex stainless steels cracking was observed only inside the affected surface layer. Selective dissolution of Fe, Cr, Mn and Mo and/or enrichment of i and Cr as well as a, S and O took place in the affected surface layers of the duplex stainless steels depending on the steel grade",
author = "Heikki Leinonen and Pekka Pohjanne and K.R. Chasse and P.M. Singh and J. Romu and T. Saukkonen and H. H{\"a}nninen",
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language = "English",
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Leinonen, H, Pohjanne, P, Chasse, KR, Singh, PM, Romu, J, Saukkonen, T & Hänninen, H 2012, Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution. in Corrosion conference and expo 2012. vol. 7, NACE - International Corrosion Conference Series, pp. 5780-5800, Corrosion conference and expo 2012, Salt Lake City, United States, 11/03/12.

Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution. / Leinonen, Heikki; Pohjanne, Pekka; Chasse, K.R.; Singh, P.M.; Romu, J.; Saukkonen, T.; Hänninen, H.

Corrosion conference and expo 2012. Vol. 7 2012. p. 5780-5800 (NACE - International Corrosion Conference Series).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution

AU - Leinonen, Heikki

AU - Pohjanne, Pekka

AU - Chasse, K.R.

AU - Singh, P.M.

AU - Romu, J.

AU - Saukkonen, T.

AU - Hänninen, H.

PY - 2012

Y1 - 2012

N2 - Stress corrosion cracking (SCC) susceptibility of the duplex stainless steels E 1.4162 (U S S32101) and E 1.4462 (U S S32205) was evaluated with U-bend specimens in the alkaline sulfide solution containing 100 g/l aOH and 55 g/l a 2S. Complementary potentiodynamic measurements were used to evaluate the effect of alloy composition on corrosion and on passivation behavior of the duplex stainless steels. The reference material in the study was the austenitic stainless steel E 1.4301 (U S S30400). Based on separate potentiodynamic curves and the free corrosion potential measurements of the alloys during the SCC tests, it is evident that Cr and i as the main alloying elements in duplex stainless steels raised the corrosion potential and lowered the critical current density of the steel, thus improving SCC resistance. Based on the potentiodynamic curves the alloying elements Mo and Mn were highly active in the hot caustic solution. SCC in the austenitic reference stainless steel was severe penetrating in the unaffected material but in the duplex stainless steels cracking was observed only inside the affected surface layer. Selective dissolution of Fe, Cr, Mn and Mo and/or enrichment of i and Cr as well as a, S and O took place in the affected surface layers of the duplex stainless steels depending on the steel grade

AB - Stress corrosion cracking (SCC) susceptibility of the duplex stainless steels E 1.4162 (U S S32101) and E 1.4462 (U S S32205) was evaluated with U-bend specimens in the alkaline sulfide solution containing 100 g/l aOH and 55 g/l a 2S. Complementary potentiodynamic measurements were used to evaluate the effect of alloy composition on corrosion and on passivation behavior of the duplex stainless steels. The reference material in the study was the austenitic stainless steel E 1.4301 (U S S30400). Based on separate potentiodynamic curves and the free corrosion potential measurements of the alloys during the SCC tests, it is evident that Cr and i as the main alloying elements in duplex stainless steels raised the corrosion potential and lowered the critical current density of the steel, thus improving SCC resistance. Based on the potentiodynamic curves the alloying elements Mo and Mn were highly active in the hot caustic solution. SCC in the austenitic reference stainless steel was severe penetrating in the unaffected material but in the duplex stainless steels cracking was observed only inside the affected surface layer. Selective dissolution of Fe, Cr, Mn and Mo and/or enrichment of i and Cr as well as a, S and O took place in the affected surface layers of the duplex stainless steels depending on the steel grade

M3 - Conference article in proceedings

SN - 978-1-6227-6078-7

VL - 7

T3 - NACE - International Corrosion Conference Series

SP - 5780

EP - 5800

BT - Corrosion conference and expo 2012

ER -

Leinonen H, Pohjanne P, Chasse KR, Singh PM, Romu J, Saukkonen T et al. Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution. In Corrosion conference and expo 2012. Vol. 7. 2012. p. 5780-5800. (NACE - International Corrosion Conference Series).