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Susceptibility of 12% chromium (Cr), ferritic type 405 (UNS S40500) stainless steel (SS) to stress corrosion cracking (SCC) was evaluated at 288° C in environments related to various steam generator conditions using slow stain rate testing (SSRT). Cracking susceptibility was determined as a function of different heat treatments and alloy microstructures. Results showed caustic and chloride (Cl−) solutions can cause transgranular SCC (TGSCC). SSRT in caustic solutions allowed a ranking of the SCC susceptibilities of steels with different as-received (AR) microstructures. In general, type 405 SS was found to be more susceptible to SCC in the AR condition than after heat treatments in the sensitization range. High-purity water with and without dissolved oxygen (O2) did not cause SCC.
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S. Frangini (1994) studied this question.
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