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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 381:

    Which of the following materials are susceptible to nitriding?

    A. Carbon steel

    B. 300 Series SS

    C. 400 Series SS

    D. All of the above

  • Question 382:

    _________ is a form of carburization resulting in accelerated localized pitting which occurs in carburizing gases and/or process streams containing carbon and hydrogen. Pits usually form on the surface and may contain soot or graphite dust.

    A. Hydrate corrosion

    B. Carbide corrosion

    C. Spheroidization

    D. Metal dusting

  • Question 383:

    __________ caustic concentrations and ________ temperatures increase the likelihood and severity of cracking with caustic embrittlement.

    A. Increasing, Decreasing B. Decreasing, Increasing

    C. Decreasing, Decreasing

    D. Increasing, Increasing

  • Question 384:

    ___________ is when oxygen reacts with carbon steel and other alloys at high temperatures converting the metal to oxide scale.

    A. High temperature corrosion

    B. Oxidation

    C. Dealloying

    D. Thermal fatigue

  • Question 385:

    Which of the following materials are affected by mechanical fatigue cracking?

    A. Only carbon steel

    B. Only carbon steel and chromes

    C. Only carbon steel, and high nickel alloys

    D. All materials

  • Question 386:

    What test is used to determine a material's toughness?

    A. Charpy impact test

    B. Guided bend test

    C. Metallography

    D. Tension test

    E. Physical fitness test

  • Question 387:

    Which of the following materials is not susceptible to high temperature hydrogen attack?

    A. 300 Series SS

    B. 5 Cr-1Mo

    C. 9Cr-1Mo

    D. All of the above

  • Question 388:

    What structure is 409 stainless steel?

    A. Martensitic

    B. Austenitic

    C. Duplex

    D. Ferritic

  • Question 389:

    With sulfidation, the presence of oxygen ________ corrosion

    A. Increases

    B. Decreases

    C. Has no effect on

    D. Stops

  • Question 390:

    With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.

    A. Sulfide

    B. Chloride

    C. Iron sulfate

    D. Iron oxide

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