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09175 Stress Corrosion Cracking of Heat Treated 2205 DSS in Caustic Solutions

Picture for 09175 Stress Corrosion Cracking of Heat Treated 2205 DSS in Caustic Solutions
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Product Number: 51300-09175-SG
ISBN: 09175 2009 CP
Author: Di Yang, Ananya Bhattacharya and Preet Singh
Publication Date: 2009
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A number of stress corrosion cracking (SCC) failures of duplex stainless steel (DSS) equipments exposed to the sulfide containing caustic solutions has been reported in recent years. SCC susceptibility of the DSS may be due to changes in the microstructure of the steel brought about by various metal fabrication processes. During metal fabrication, localized areas of DSSs may be exposed to different cooling rates or aging temperatures, which may lead to changes in the microstructure. These changes in microstructure may in-turn affect the general and localized corrosion or SCC susceptibility of the affected area as compared to the rest of the metal. In this study the effect of different annealing and aging temperatures on the microstructure and SCC behavior of 2205 DSS in sulfide-containing caustic solution was evaluated. 2205 DSS samples were annealed at 1000ºC or 1150ºC and then aged at 475ºC, 600ºC or 800ºC. The heat-treated specimens were then tested for SCC susceptibility in white liquor. It was found that the changes in the microstructure of the steel due to various heat treatments had a significant effect on its SCC susceptibility in caustic environments.

Keywords: duplex stainless steel, stress corrosion cracking, caustic, heat treatment, white liquor
A number of stress corrosion cracking (SCC) failures of duplex stainless steel (DSS) equipments exposed to the sulfide containing caustic solutions has been reported in recent years. SCC susceptibility of the DSS may be due to changes in the microstructure of the steel brought about by various metal fabrication processes. During metal fabrication, localized areas of DSSs may be exposed to different cooling rates or aging temperatures, which may lead to changes in the microstructure. These changes in microstructure may in-turn affect the general and localized corrosion or SCC susceptibility of the affected area as compared to the rest of the metal. In this study the effect of different annealing and aging temperatures on the microstructure and SCC behavior of 2205 DSS in sulfide-containing caustic solution was evaluated. 2205 DSS samples were annealed at 1000ºC or 1150ºC and then aged at 475ºC, 600ºC or 800ºC. The heat-treated specimens were then tested for SCC susceptibility in white liquor. It was found that the changes in the microstructure of the steel due to various heat treatments had a significant effect on its SCC susceptibility in caustic environments.

Keywords: duplex stainless steel, stress corrosion cracking, caustic, heat treatment, white liquor
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Stress Corrosion Cracking in the weld and heat affected zones of Duplex Stainless Steels has been experienced in different industries.  In this paper, an attempt has been made to study the various aspects of this type of corrosion, brought about by welding.  Results show duplex stainless steel base metal is also susceptible.
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