API RP 571 under Polythionic Acid Stress Corrosion Cracking (PTA SCC) specifies:
“Cracking is usually intergranular, and often localized, especially in sensitized austenitic stainless steels exposed to sulfur-containing environments during shutdown or cleaning.”
“It is not always visible on inspection and may only become evident when a leak occurs.”
(Reference: API RP 571, Section 4.2.2.5 – PTA SCC)
Hence, option C is correct as it best describes the detection difficulty and behavior of PTA SCC.
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