(Which of the following may be more susceptible to polythionic acid stress corrosion cracking?)
A.
SA-516 Grade 70 carbon steel
B.
Type 304 stainless steel
C.
Monel 400
D.
Type 321 stainless steel
The Answer Is:
B
This question includes an explanation.
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Polythionic acid stress corrosion cracking (PASCC) occurs in austenitic stainless steels exposed to sulfur-containing environments during shutdowns, particularly when sulfide scales react with oxygen and moisture.
According to API RP 571:
Unstabilized stainless steels, such as Type 304, are most susceptible
Stabilized grades (e.g., Type 321, titanium-stabilized) are more resistant
Carbon steel and Monel are not susceptible to PASCC
Referenced Documents (Study Basis):
API RP 571 – Section on Polythionic Acid SCC
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API-571 PDF/Engine
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