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Corrosion and Materials Professional

Exam Details

  • Exam Code
    :API-571
  • Exam Name
    :Corrosion and Materials Professional
  • Certification
    :API Certifications
  • Vendor
    :API
  • Total Questions
    :454 Q&As
  • Last Updated
    :Jun 28, 2025

API API Certifications API-571 Questions & Answers

  • Question 121:

    In fired heater tubes, dissimilar weld metal cracking forms primarily on the _______ of the material.

    A. Outside

    B. Inside

    C. Welds

    D. All of the above

  • Question 122:

    Annealed steels are more resistant to Spheroidization than normalized steels. _________ grained steels are more resistant than ______ grained steels.

    A. Fine, Course

    B. Course, Fine

    C. PWHT, Non-PWHT

    D. Non-PWHT, PWHT

  • Question 123:

    Sensitization occurs in the _____ to _______ range.

    A. 800º F, 1400º F

    B. 750º F, 1500º F

    C. 600º F, 1120º F

    D. 1000º F, 1750º F

  • Question 124:

    Sigma phase in welds can be minimized by controlling ferrite in the range of _________ for Type 347 SS.

    A. 3%-5%

    B. 5%-7%

    C. 7%-9%

    D. 5%-9%

  • Question 125:

    Soil to Air interface areas are usually more susceptible to corrosion than the rest of the structure because of ___________ and __________ availability.

    A. Moisture

    B. Bacteria

    C. Oxygen

    D. B and C

    E. A and C

  • Question 126:

    ________ usually occurs when a colder liquid contacts a warmer metal surface.

    A. Stress cracking

    B. Thermal fatigue

    C. Thermal shock

    D. Stress shock

  • Question 127:

    Which of the following are susceptible to thermal fatigue?

    A. SA-516-70

    B. SA-182 Gr B

    C. SA-53 Gr B

    D. All of the above

  • Question 128:

    In design and fabrication, it is advisable to avoid sharp changes in cross section, such as short radius fillets or undercut that can give rise to _________.

    Long-seam welds are particularly susceptible to reheat cracking due to mismatch caused by fit up problems.

    A. Stress concentrations

    B. Cracking

    C. Circumferential stress

    D. All of the above

  • Question 129:

    ________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.

    A. Condensate corrosion

    B. Cavitation

    C. Dew-Point corrosion

    D. Atmospheric corrosion

  • Question 130:

    SOHIC is driven by localized stresses so that __________ is somewhat effective in preventing SOHIC damage.

    A. PWHT

    B. Preheat

    C. Temperature

    D. None of the above

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