API-571 Exam - Topic 1 Question 117 Discussion

Actual exam question for API's API-571 exam

Question #: 117
Topic #: 1

_________ is a change in the microstructure of certain carbon steels and 0.5Mo steels after long-term operation in the 800 F to 1100 F range that may cause a loss in strength, ductility and/or creep resistance.

AEmbrittlement

BCarburization

CGraphitization

DSensitization

Show Suggested Answer

Suggested Answer: C

by Mariko at Oct 30, 2025, 09:56 PM

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Aleisha

7 hours ago

But D) Sensitization could also apply. It affects strength too.

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Mammie

5 days ago

I’m leaning towards C) Graphitization. It relates to carbon steels.

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Shawnta

10 days ago

I agree, Embrittlement makes sense. Loss of ductility is key.

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Carrol

29 days ago

I think the answer is A) Embrittlement. It fits the description.

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Elke

1 month ago

Wow, I didn't know that could happen at those temps!

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Avery

1 month ago

Wait, are we sure it's not B) Carburization?

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Milly

1 month ago

Totally agree, it's A) Embrittlement for sure.

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Wilda

2 months ago

Haha, Graphitization? More like "Graphite-ization" am I right? *wink wink*

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Sylvie

2 months ago

Sensitization? Nah, that's not what this question is asking about. Gotta be Graphitization.

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Barabara

2 months ago

Carburization? Really? I think you need to go back to materials science 101, buddy.

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Sabra

2 months ago

Embrittlement sounds like the right answer here. That's what we've been dealing with in our refinery.

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Kathrine

2 months ago

Graphitization, definitely. I've seen this happen in my power plant.

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Dell

3 months ago

I remember studying about creep resistance in steels, and I think that points to A) Embrittlement. But I could be mixing it up with something else.

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Ling

3 months ago

I’m a bit confused. I thought sensitization was related to stainless steels. Could it be C) Graphitization instead?

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Jonell

3 months ago

I feel like I've seen a similar question before, and it was about graphitization. But this one seems to focus more on strength loss, so maybe it's A) Embrittlement?

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Hassie

3 months ago

It's definitely A) Embrittlement.

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Mertie

4 months ago

I thought it was C) Graphitization?

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Aileen

4 months ago

I think the answer might be A) Embrittlement, but I'm not entirely sure. I remember something about microstructural changes in steels.

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Tatum

4 months ago

I've got a good feeling about this one. The question is describing graphitization, which is the formation of graphite within the steel microstructure at high temps. I'm confident that's the right answer.

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Kizzy

5 months ago

Graphitization sounds like the most likely answer here. The temperature range and potential loss of strength and ductility match what I know about that phenomenon in carbon steels.

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Lenny

5 months ago

I'm a bit unsure about this one. The temperature range and potential loss of properties makes me think it could be related to embrittlement or graphitization, but I'll need to carefully consider each option.

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Monte

5 months ago

Okay, I remember learning about this in my materials science class. I think the key is to identify the specific type of microstructural change described in the question.

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Frank

5 months ago

Hmm, this sounds like a metallurgy question. I'll need to think about the different microstructural changes that can happen in steel at high temperatures.

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Ivan

3 months ago

I’m leaning towards graphitization.

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Teresita

3 months ago

I think it’s definitely embrittlement.

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Makeda

4 months ago

Yeah, embrittlement is the most common issue here.

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