Determination of the Acceptability Conditions for a Safe Use of Alloys UNS S32750 Through SSRT Screening

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Product Number: 51321-16322-SG

Author: Vincent Duquesnes/Christophe Mendibide/Wenle He/Raveendra Siriki

Publication Date: 2021

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The super duplex stainless steel tube material UNS S32750 showed higher SCC and SSC resistance compared to the plate duplex stainless steel UNS S32205. It has been observed that both the duplex and super-duplex stainless steels are suffering from selective dissolution in low pH at 80°C, however, in different phases. Selective dissolution of austenite is observed in alloy UNS S32750 at 80°C when pH ≤ 3.5, whereas only ferrite dissolution is observed in UNS S32205 (as plate) at 80°C and pH 4.5. No SSC has been observed in UNS S32750 at lower temperature down to 23°C and at pH 2.8. However, dissolution in both phases has been evidenced in UNS S32205 (as foil) at temperature as low as 23 and 50°C and pH between 2.8 and 4.5. EBSD investigation has shown that the microstructural difference between the thin and thick plate products of UNS S32205 is most likely process-related. In addition, the UNS S32707 plate showed the highest resistance to SCC and SSC. No degradation has been observed for UNS S32707 in any of the conditions tested in this study.

Key words: SSRT, H2S, pH, temperature, selective dissolution (SD), stress corrosion cracking (SCC), sulfide stress corrosion cracking (SSC), environmental assisted cracking (EAC)

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Key words: SSRT, H2S, pH, temperature, selective dissolution (SD), stress corrosion cracking (SCC), sulfide stress corrosion cracking (SSC), environmental assisted cracking (EAC)

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