The most important alloying element for prevention of high-temperature hydrogen attack is:
A.
Manganese
B.
Chromium
C.
Nickel
D.
Niobium
The Answer Is:
C
This question includes an explanation.
Explanation:
According to API RP 941, and also noted in RP 571:
“Nickel significantly improves resistance to HTHA (High Temperature Hydrogen Attack) by stabilizing austenitic phases and reducing carbide decomposition.”
Hence, option C is correct.
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