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API-571 Braindumps Real Exam Updated on Nov 04, 2025 with 112 Questions
API Corrosion and Materials API-571 Exam
API Corrosion and Materials API-571 Exam is related to Advanced Corrosion & Materials Professional Certifications. This exam validates the knowledge and skills of corrosion engineers, corrosion processes among specialized inspectors, chemical engineers and other professionals across the entire petrochemical industry. Highly Specialized Inspectors, Corrosion Engineers and Chemical Engineers usually hold or pursue this certification and you can expect the same job role after completion of this certification.
API-571 Exam topics
Candidates must know the exam topics before they start of preparation. Because it will really help them in hitting the core. Our API-571 exam dumps will include the following topics:
- Determine general damage mechanisms on uniform or localized loss thickness and explain the various types of corrosion related to it.
- Knowledge of general damage mechanisms applicable to the industry and be able to identify their features and functions.
- Explore refining industry damage mechanisms for environment assisted cracking and be able to identify the other types of mechanisms.
- Identify the various mechanical and metallurgical failure mechanisms such as brittle fracture, steam blanketing, stress rupture, cracking, thermal shock, fatigue and corrosion.
- Explore damage mechanisms on high temperature corrosion including oxidation, sulfidation, carburization and metal dusting.
- Possess a general background on the scope, organization and use of API 571 and be able to review the standards and other references related to it.
NEW QUESTION # 14
Typical HF Alkylation units operate with 1% to 3% water in the acid, equivalent to an HF-inwater concentration of 97% to 99% and the temperatures are generally below _________.
- A. 200(o) F
- B. 300(o) F
- C. 150(o) F
- D. 250(o) F
Answer: C
NEW QUESTION # 15
Alloys with nickel content above _________ are highly resistant to Cl SCC. The greatest susceptibility is 8% to
12% nickel.
- A. 35%
- B. 15%
- C. 30%
- D. 20%
Answer: A
NEW QUESTION # 16
Regular and controlled carbon grades of stainless steels such as types 304/304H and 316/316H are particularly susceptible to sensitization in the weld HAZ. Low carbon "L" grades are less susceptible and usually can be welded without sensitizing. The "L" grades will not sensitize provided long term operating temperatures do not exceed about __________.
- A. 700º F
- B. 800º F
- C. 750º F
- D. 900º F
Answer: C
NEW QUESTION # 17
Stainless steels have higher coefficients of thermal expansion than carbon steel or low alloy steel or nickel based alloys and are more likely to see _________.
- A. Higher stresses
- B. Higher temperatures
- C. None of the above
- D. Higher pressure
Answer: A
NEW QUESTION # 18
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. Circumferential stress
- B. All of the above
- C. Stress concentrations
- D. Cracking
Answer: C
NEW QUESTION # 19
Which of the following is the lowest threshold temperature at which creep damage is a concern in carbon steel with tensile strength > 60ksi (414 MPa)?
- A. 900°F (482°C)
- B. 800°F (427°C)
- C. 700°F (371°C)
- D. 600°F (316°C)
Answer: C
Explanation:
API RP 571 states in the section on Creep Damage:
"Creep damage in carbon steels generally becomes a concern above 700°F (371°C), especially for steels with higher tensile strength (greater than 60 ksi)."
"For prolonged exposure above this temperature, time-dependent deformation can lead to material degradation and cracking, especially at weldments and stress concentrations." Thus, the lowest threshold for creep in high-strength carbon steels is 700°F (371°C), making option B correct.
NEW QUESTION # 20
_________ 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. Spheroidization
- B. Metal dusting
- C. Hydrate corrosion
- D. Carbide corrosion
Answer: B
NEW QUESTION # 21
Dissimilar metal weld cracks (between ferritic and austenitic materials) form:
- A. At the toe of the weld in the heat-affected zone of the austenitic material.
- B. At the toe of the weld in the heat-affected zone of the ferritic material.
- C. In the center of the dissimilar weld.
- D. In the parent metal on the austenitic side of the weld.
Answer: B
Explanation:
API RP 571 explains the typical location of dissimilar metal weld (DMW) cracks as follows:
"DMW cracking usually occurs in the heat-affected zone (HAZ) on the ferritic side of the weld."
"The difference in thermal expansion coefficients, grain structures, and creep rates between the ferritic and austenitic materials contributes to the development of high stress and strain concentrations in the HAZ of the ferritic material." (Reference: API RP 571, Section 4.2.1.6 - Dissimilar Metal Weld Cracking) Thus, these cracks do not occur in the center of the weld or on the austenitic side, but rather at the ferritic HAZ, making option A correct.
NEW QUESTION # 22
For a specific material, HTHA is dependent on temperature, hydrogen partial pressure, time and _________.
- A. Pressure
- B. Alloy composition
- C. Velocity
- D. Stress
Answer: D
NEW QUESTION # 23
Nickel based alloys usually contain ________ nickel.
- A. 30%
- B. 12%
- C. 10%
- D. 20%
Answer: A
NEW QUESTION # 24
Which of these materials are not susceptible to PASCC?
- A. 400 Series SS
- B. Both A and C
- C. Carbon steel
- D. 300 Series SS
Answer: B
NEW QUESTION # 25
Susceptibility of an alloy to sulfidation is determined by its ability to form protective _________.
- A. Oxide scales
- B. None of the above
- C. Sulfide scales
- D. Carbide scales
Answer: C
NEW QUESTION # 26
High temperature H2 / H2S corrosion damage is minimized by using alloys with high _________ content.
- A. Chromium
- B. Molybdenum
- C. Stainless
- D. Carbon
Answer: A
NEW QUESTION # 27
What is the chemical symbol for propane or propylene?
- A. C3
- B. C(2)
- C. CH4
- D. C4
Answer: A
NEW QUESTION # 28
A condition where steel loses strength due to the removal of carbon and carbides leaving only an iron matrix is called decarburization. This occurs during high temperatures, during PWHT and from exposure to fires. Which of the following materials is not affected by this?
- A. None of the above
- B. Duplex SS
- C. Low alloy steel
- D. Carbon steel
Answer: B
NEW QUESTION # 29
Amine cracking is ________ likely to occur in lean MEA and DEA services than in MDEA and DIPA services.
- A. None of the above
- B. Less
- C. More
- D. As
Answer: C
NEW QUESTION # 30
Which of the following generally manifests itself as a subsurface damage mechanism?
- A. Sulfide Stress Corrosion Cracking (SCC)
- B. Stress-Oriented Hydrogen-Induced Cracking (SOHIC)
- C. Caustic Cracking
- D. Amine Stress Corrosion Cracking
Answer: B
Explanation:
As defined in API RP 571, under Hydrogen Blistering and HIC/SOHIC:
"SOHIC typically manifests as subsurface stepwise cracking, generally oriented perpendicular to the direction of stress."
"This mechanism initiates below the surface, typically in weld heat-affected zones, and requires metallographic or advanced ultrasonic methods to detect." By contrast, SSC, caustic cracking, and amine SCC are primarily surface-initiated, stress-related cracking mechanisms.
Thus, SOHIC is the subsurface mechanism in this list, making option D correct.
NEW QUESTION # 31
H#S content, pH, temperature, velocity, and oxygen concentration are critical factors of:
- A. Sour water acid corrosion
- B. Sulfuric acid corrosion
- C. Polythionic acid cracking
- D. Naphthenic acid corrosion
Answer: A
Explanation:
API RP 571 identifies these parameters as critical to the corrosion rate of carbon and low alloy steels in sour water environments:
"The extent of corrosion in sour water is influenced by pH, H#S content, temperature, liquid velocity, and oxygen contamination."
"These factors control the formation and stability of protective iron sulfide layers." (Reference: API RP 571, Section 4.3.2.1 - Sour Water Corrosion) Therefore, the correct answer is A.
NEW QUESTION # 32
Graphitization can be prevented by using chromium containing low alloys steels for long-term exposure above ________.
- A. 700(o) F
- B. 800(o) F
- C. 750(o) F
- D. 650(o) F
Answer: B
NEW QUESTION # 33
Cracking of dissimilar weld metals occurs in the __________ side of a weld joining 300 Series SS and carbon steel.
- A. Both of the above
- B. Ferritic
- C. None of the above
- D. Austenitic
Answer: B
NEW QUESTION # 34
Amine corrosion is primarily caused by:
- A. amine solutions above 250°F (121°C).
- B. amine concentration.
- C. dissolved acid gases.
- D. alkaline sour water.
Answer: C
Explanation:
From API RP 571 Section 5.1.1.3 (Amine Corrosion):
"Amine corrosion is a form of general or localized corrosion caused by the presence of amine solutions used to remove acid gases (H#S and CO#)... Corrosion is most severe in areas where acid gas loading is high." While temperature and concentration are contributing factors, the primary driver is dissolved acid gases such as CO# and H#S.
Thus, the correct answer is Option C.
NEW QUESTION # 35
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