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Exam API-571 topic 1 question 158 discussion

Actual exam question from API's API-571
Question #: 158
Topic #: 1
[All API-571 Questions]

Which of the following materials are generally not suitable for HF service?

  • A. 300 Series SS
  • B. Carbon steel
  • C. 400 Series SS
  • D. Both A and C
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Suggested Answer: D 🗳️
by ahmadmm at Oct. 11, 2023, 6:24 a.m.

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ahmadmm
1 year, 1 month ago
300 and 400 series stainless steels are also susceptible to cracking in HF environments. This is because HF acid can dissolve the protective chromium oxide layer on the surface of the stainless steel, exposing the underlying metal to corrosion. The resulting corrosion can lead to the formation of cracks in the metal.
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