Sensitivity to stress corrosion cracking of type 405 stainless steel in high-temperature aqueous environments

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3293523· OSTI ID:7072937

Frangini, S ^[1]

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1. ENEA-C.R.E. Casaccia, Rome (Italy). Corrosion Lab.

It is well known that steam generators of pressurized water reactors suffer from a variety of corrosion problems. 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[sup [minus]]) 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 that after heat treatments in the sensitization range. High-purity water with and without dissolved oxygen (O[sub 2]) did not cause SCC.

• OSTI ID: 7072937
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 50:6; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

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