From API RP 571 Section 5.1.2.5 (Polythionic Acid Stress Corrosion Cracking):
“PTASCC typically occurs on the surface of stainless steels that have been sensitized. Since cracks are open to the surface, liquid penetrant testing (PT) is the most effective detection method.”
Magnetic particle testing is ineffective for non-magnetic materials like austenitic stainless steels.
UT is less effective for fine surface-connected cracks.
Hardness testing is unrelated to detecting cracking.
Thus, Option C (Liquid penetrant testing) is the correct and preferred method for detecting PTASCC.
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