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

2 months 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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Burma

15 days ago

D) 9-12

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Erinn

17 days ago

C) 7-9

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Reuben

19 days ago

B) 5-7

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Luis

29 days ago

A) 3-5

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Deonna

2 months 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

2 months ago

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

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Ria

2 months ago

I think the answer is C) 7-9.

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Vilma

2 months 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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Amie

29 days ago

I'm not so sure, I think it might be D) 9-12. More chromium usually means better resistance.

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Olen

1 months ago

I think you might be onto something with A) 3-5. It could be the minimum amount needed for improvement.

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Rhea

1 months ago

I'm not so sure, I think it might be a higher amount of chromium that's needed.

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Val

1 months ago

I think you might be onto something with that strategy.

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Lili

2 months 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

2 months 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

2 months 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

2 months ago

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

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Jodi

2 months 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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