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API-571 – Corrosion and Materials

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Showing 4–6 of 20 questions

Question 4

A condition where steel loses strength due to the removal of carbon and carbides leaving only an iron matrix is called decarburization. This occurs during high temperatures, during PWHT and from exposure to fires. Which of the following materials is not affected by this?

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  • ○

    Low alloy steel
  • ○

    Duplex SS
  • ○

    Carbon steel
  • ○

    None of the above
Question 5

The loss in strength from spheroidization (Softening) is usually accompanied by a(n) _________ in ductility, which allows for deformation at stress concentrations.

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  • ○

    Increase
  • ○

    Decrease
  • ○

    Reduction
  • ○

    Yield
Question 6

Naphthenic acid is _____ by catalytic reactions in downstream hydro processing and FCC units.

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  • ○

    Enhanced
  • ○

    Destroyed
  • ○

    Concentrated
  • ○

    Diluted