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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 361:

    Wet H²S services or _________ acid services are process where hydrogen diffuses into the steel and hydrogen embrittlement (HE) is an issue.

    A. HF

    B. Sulfuric

    C. Caustic

    D. HCL

  • Question 362:

    Naphthenic acid corrosion is a form of high temperature corrosion that occurs primarily in crude and vacuum units and downstream units that process certain fractions that contain naphthenic acid. Which of the following materials is susceptible to naphthenic acid corrosion?

    A. Carbon steel

    B. 300 Series SS

    C. 400 Series SS

    D. All of the above

  • Question 363:

    The presence of ________ in H²S streams increases the severity of high temperature sulfide corrosion at temperatures above about 500º F

    A. Amine

    B. Hydrogen

    C. Sulfides

    D. All of the above

  • Question 364:

    Hydrogen blisters may form at many different depths from the surface of the steel, in the middle of the plate or near a weld. In some cases, neighboring or adjacent blisters that are at slightly different depths (planes) may develop cracks that link them together. Interconnecting cracks between the blisters often have a __________ appearance.

    A. Crescent

    B. Eyebrow

    C. Step like

    D. Jagged

  • Question 365:

    Thermal fatigue cracks usually:

    A. Initiate on the surface of the component.

    B. Initiate in the subsurface of the component.

    C. Grow very rapidly (at the speed of sound in the material).

    D. Are very tight and narrow.

  • Question 366:

    300 Series SS is susceptible to LME when it comes in contact with molten ________.

    A. Cadmium

    B. Mercury

    C. Zinc

    D. Lead

  • Question 367:

    A 5Cr-1Mo piping system in the hydrogen unit shows significant internal wall loss after 2 years in service due to CO?corrosion. Which material would be best suited to use to install a new pipe system?

    A. Titanium

    B. 9Cr-1Mo

    C. A-106 Gr B

    D. 316 SS

  • Question 368:

    300 Series SS can suffer pitting corrosion, crevice corrosion and ________ in fresh, blackish and salt water.

    A. General corrosion

    B. Oxidation

    C. SCC

    D. None of the above

  • Question 369:

    Temper embrittlement can be identified by a(n) shift in the ductile-to-brittle transition temperature measured in a Charpy impact test.

    A. Upward

    B. Downward

    C. Abrupt

    D. None of the above

  • Question 370:

    Different organisms thrive on different nutrients including inorganic substances (Sulfur, H²S), and organic substances (Hydrocarbons, Organic acids). In addition, all organisms require a source of carbon, nitrogen and _______ for growth.

    A. Oxygen

    B. Water

    C. Manganese

    D. Phosphorous

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