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API-571 Exam - Topic 1 Question 128 Discussion

Nitriding of steels becomes most severe at temperatures above:
D) 900F (480C)
A) 200F (95C)
B) 500F (260C)
C) 600F (315C)

API-571 Exam - Topic 1 Question 128 Discussion

Actual exam question for API's API-571 exam
Question #: 128
Topic #: 1
[All API-571 Questions]

Nitriding of steels becomes most severe at temperatures above:

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Suggested Answer: D

API RP 571 under Nitriding (Section 4.2.16):

''Nitriding occurs at elevated temperatures and is most severe at temperatures above 900F (480C).''

''This mechanism is associated with the reaction of ammonia or other nitrogen-containing compounds with the steel surface, leading to brittle nitride formation.''

Therefore, the correct answer is D.


by Glenna at Jul 01, 2026, 08:28 PM

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Francoise
But what about C) 600F? Isn't that significant too?
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Maryanne
5 days ago
I agree, D) 900F seems right. It's where reactions intensify.
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Lynsey
10 days ago
I think it's D) 900F. Higher temps mean more nitriding.
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Fatima
15 days ago
I agree, 600F seems too low for severe nitriding.
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Bette
21 days ago
Really? I thought nitriding started lower than that.
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Kristine
26 days ago
No way, it has to be 900F!
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Gayla
1 month ago
I think 600F is the right answer.
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Beth
1 month ago
It's definitely above 500F.
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Pauline
1 month ago
I remember discussing that nitriding can be problematic at lower temperatures too, but I think the most severe effects kick in at 600F.
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Lonna
2 months ago
I’m pretty sure nitriding starts to get severe around 900F, but I’m not entirely confident about that.
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Denise
2 months ago
I practiced a similar question where the threshold was around 500F, but I feel like nitriding might be worse at 600F.
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Zachary
2 months ago
I think nitriding gets more aggressive at higher temperatures, but I can't remember if it's 600F or 900F.
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