Exam API-571 Topic 1 Question 135 Discussion

Actual exam question for API's API-571 exam
Question #: 135
Topic #: 1
The most important alloying element for prevention of high-temperature hydrogen attack is:

Suggested Answer: C Vote an answer

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.

by Odelia at Apr 24, 2026, 04:46 PM

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