Abstract
The slow strain rate testing technique was used to study the stress corrosion cracking (SCC) susceptibility of AISI 304 stainless steel in chloride‐containing 35% solutions at 104°C. The SCC susceptibility was evaluated from experimentally obtained quantitative expressions for the decreases of ultimate tensile strength and reduction of area in these solutions compared to inert conditions. The inhibiting effect of nitrates was also studied. Electrochemistry of the alloy‐environment system is presented, and correlation between SCC susceptibility and the electrochemical parameters was established. Results are summarized as follows: (i) SCC of 304 SS may occur in the chloride‐containing sulfate solutions at 104°C, (ii) the critical chloride concentration is 2000 ppm or less, above which SCC will occur, (iii) the threshold nitrate concentration is 1000 ppm or less, above which SCC can be inhibited, and (iv) the results are consistent with the view that SCC and pitting initiate in the same way.
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