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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 431:

    __________ are the most common type of equipment susceptible to carburization in the refining industry.

    A. Reactors

    B. Heat exchangers

    C. Heater tubes

    D. Fin Fans

  • Question 432:

    ___________ cooling water outlet temperatures and/or process side outlet temperatures tend to __________ corrosion rates as well as fouling tendency.

    A. Increasing, decrease

    B. Decreasing, decrease

    C. Decreasing, increase

    D. Increasing, increase

  • Question 433:

    Caustic embrittlement is a form of stress corrosion cracking characterized by surface- initiated cracks that occur in piping and equipment exposed to caustic, primarily adjacent to non-PWHT welds. Which of the following materials is the most resistant to embrittlement?

    A. Carbon steel

    B. Nickel based alloys

    C. Low alloy steels

    D. 400 Series SS

  • Question 434:

    Corrosion of carbon steel and other alloys from their reaction with sulfur compounds in high temperature environments is called ______. The presence of hydrogen accelerates corrosion.

    A. Sulfide corrosion

    B. High temperature corrosion

    C. H²S corrosion

    D. Sulfidation

  • Question 435:

    What structure is 410 stainless steel?

    A. Martensitic

    B. Austenitic

    C. Duplex

    D. Ferritic

  • Question 436:

    Sulfidation usually creates:

    A. Uniform corrosion.

    B. Isolated pitting.

    C. Intergranular cracking.

    D. Transgranular cracking.

    E. Hard and brittle zones.

    F. Inspection nightmares.

  • Question 437:

    Sulfide stress cracking (SSC) is defined as cracking of metal under the combined action of tensile stress and corrosion in the presence of _________ and _________.

    A. Sulfur, Oxide

    B. Hydrogen, water

    C. H²S, Oxygen

    D. Water, H²S

  • Question 438:

    Sulfidation is also known as ____________.

    A. Sulfur corrosion

    B. Sulfate corrosion

    C. Sulfidic corrosion

    D. None of the above

  • Question 439:

    300 Series SS, 5Cr, 9Cr and 12Cr alloys are not susceptible to ________ at conditions normally seen in refineries.

    A. Cl SCC

    B. SOHIC

    C. HTHA

    D. HTLA

  • Question 440:

    Since all fuels contain some amount of sulfur, sulfuric and sulfurous acid __________ can occur if the metal temperature is below this temperature.

    A. Corrosion

    B. Pitting

    C. Dew point corrosion

    D. All of the above

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