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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 221:

    Carbon steel is susceptible to SCC when used in ___________ service.

    A. Hydrogen

    B. Ammonia

    C. High temperature

    D. High pressure

  • Question 222:

    Which of these materials are not susceptible to Spheroidization?

    A. Carbon steel

    B. 9Cr-1Mo

    C. 316 SS

    D. Both A and B

  • Question 223:

    __________ is a form of cracking that results when certain molten metals come in contact with specific alloys. Cracking can be very sudden and brittle in nature.

    A. SCC

    B. LME

    C. AET

    D. SOHIC

  • Question 224:

    300 Series SS, 400 Series SS and duplex SS are subject to pitting and localized corrosion under insulation. In addition, __________ are also subject to SCC if chlorides are present, while _________ are less susceptible.

    A. Duplex SS, Low alloys

    B. 300 Series SS, Duplex SS

    C. Duplex SS, 300 Series Ss

    D. None of the above

  • Question 225:

    ________ greatly increases the probability and severity of blistering, HIC and SOHIC damage.

    A. Acids

    B. Caustics

    C. Amines

    D. Cyanides

  • Question 226:

    With sour water corrosion, at a given pressure, the H²S concentration in the sour water _________ as temperatures ________.

    A. Increases, increases

    B. Decreases, decreases

    C. Increases, decreases

    D. Decreases, increases

  • Question 227:

    The creep threshold temperature for carbon steel is ________.

    A. 315º C

    B. 371º C

    C. 426º C

    D. 538º C

  • Question 228:

    Amine units are used in refineries to remove H²S, CO² and _________ from process streams originating in many units including the coker, crude, FCC and hydrogen.

    A. NA²

    B. Cl²

    C. Mercaptans

    D. None of the above

  • Question 229:

    Carbon dioxide (CO²) corrosion results when CO?dissolves in water to form ________.

    A. Carbon monoxide

    B. Carbonic acid

    C. Hydrofluoric acid

    D. None of the above

  • Question 230:

    _________ is surface initiated cracks caused by environmental cracking of 300 Series SS and some nickel based alloys under the combined action of tensile stress, temperature and an aqueous chloride environment. The presence of dissolved oxygen increases the propensity for cracking.

    A. SSC

    B. SOHIC

    C. Cl SCC

    D. HIC

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