API Exam API-571 Topic 1 Question 78 Discussion

Actual exam question for API's API-571 exam

Question #: 78
Topic #: 1

Increasing chromium content in the alloy improves resistance to sulfidation. However, there is little improvement with increasing chromium content until about ________ Cr.

A3-5

B5-7

C7-9

D9-12

Show Suggested Answer

Suggested Answer: C

by Tracey at Dec 22, 2023, 07:46 AM

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Kati

5 days ago

Ah, the age-old question: how much chromium is too much chromium? Sounds like a job for Captain Stainless Steel!

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Deonna

6 days ago

I'm not sure, but I think it might be D) 9-12. Maybe the improvement is even greater with higher chromium content.

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Jerry

7 days ago

I agree with Ria, because that's when the improvement in resistance to sulfidation starts to show.

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Ria

8 days ago

I think the answer is C) 7-9.

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Vilma

9 days ago

I'm gonna have to go with A) 3-5. Hey, maybe the question is a trick and they're looking for the minimum amount of chromium. Gotta think outside the box, right?

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Lili

10 days ago

I see your point, but I still think A) 3-5 makes more sense based on the rationale provided in the question.

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Junita

11 days ago

B) 5-7 is my pick. It's the Goldilocks zone - not too little, not too much, just the right amount of chromium to get the job done.

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Chaya

13 days ago

Hmm, I'm leaning towards D) 9-12. Gotta have that extra chromium kick to really make the alloy corrosion-proof, you know? Anything less and it's just playing around the edges.

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Beckie

13 days ago

I disagree, I believe the answer is C) 7-9.

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Jodi

18 days ago

I think the answer is C) 7-9. Chromium is a key alloying element that enhances sulfidation resistance, but there's a sweet spot where the benefits really start to kick in.

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Lili

19 days ago

I think the answer is A) 3-5.

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