The high resistance to corrosion of 22 Cr, 25 Cr and super duplex stainless steels in chloride containing environments is well known. In sour service, resistance to stress corrosion cracking, pitting and crevice corrosion in the presence of CO{sub 2} and H{sub 2}S is required. This paper presents the results of tests to determine the resistance of three duplex stainless steels to stress corrosion cracking, pitting and crevice corrosion at elevated temperature in a synthetic brine containing different concentrations of H{sub 2}S. The three alloys were UNS S31803, UNS S32550 (low Cu) and UNS S32760. All three materials were tested in the cold worked condition, and loaded to about the 0.2% proof stress. The tests were conducted with 93 bar (9.3 MPa) CO{sub 2} and either 0.125, 0.25 or 0.375 bar (12.5, 25 or 37.5 KPa) H{sub 2}S. The results showed that only the super duplex alloy, UNS S32760, was resistant to SCC at 80 C at all of the H{sub 2}S concentrations. Pitting and crevice corrosion occurred at 121 C only at the highest H{sub 2}S concentration on all the alloys. The depth and severity of attack varied from alloy to alloy and indicated that super duplex UNS S32760more » is more resistant than 25Cr, UNS S32550 (low Cu), which is more resistant than 22Cr UNS S31803.« less
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