[Mar 28, 2026] Fully Updated Free Actual API API-571 Exam Questions
Free API-571 Questions for API API-571 Exam [Mar-2026]
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The price of the API-571 exam is $365 USD.
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.
NEW QUESTION # 40
With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.
- A. Iron sulfate
- B. Chloride
- C. Sulfide
- D. Iron oxide
Answer: A
NEW QUESTION # 41
Cracking of dissimilar weld metals occurs on the _________ side of a weld between an austenitic and a Ferritic material operating at high temperatures.
- A. Austenitic
- B. Cathodic
- C. Ferritic
- D. Anodic
Answer: C
NEW QUESTION # 42
_________ is most likely found in hard weld and heat-affected zones and in high strength components.
- A. SOHIC
- B. HIC
- C. Blistering
- D. SSC
Answer: D
NEW QUESTION # 43
Corrosion protection in the boiler is accomplished by laying down and continuously maintaining a layer of _____.
- A. Manganese
- B. Carbonate
- C. Magnetite
- D. Carbon monoxide
Answer: C
NEW QUESTION # 44
The amplitude and frequency of vibration as well as the _________ of the components are critical factors in vibration-induced fatigue.
- A. Material properties
- B. Velocity
- C. Temperature
- D. Fatigue resistance
Answer: D
NEW QUESTION # 45
The effects of hydrogen embrittlement ___________ with _________ temperatures.
- A. Decrease, decreasing
- B. Increase, increasing
- C. Increase, decreasing
- D. Decrease, increasing
Answer: D
NEW QUESTION # 46
Which of the following statements about high-temperature hydrogen attack is most accurate?
- A. High-temperature hydrogen attack will most often be associated with the formation of surface blisters.
- B. 300 series stainless steels are also susceptible to high-temperature hydrogen attack at conditions normally seen in refinery units.
- C. Acoustic emission testing is not a proven method for the detection of high-temperature hydrogen attack damage.
- D. High-temperature hydrogen attack damage is most often limited to welds and heat-affected zones.
Answer: C
Explanation:
API RP 571 on HTHA states:
"Acoustic emission testing is not currently a proven or reliable method for identifying HTHA in refinery components."
"HTHA typically occurs internally, not as surface blisters, and is not limited to welds. Austenitic (300 series) stainless steels are generally resistant at normal refinery conditions." (Reference: API RP 571, Section 4.2.1.3 - High Temperature Hydrogen Attack) Thus, option A is the most accurate statement.
NEW QUESTION # 47
Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.
- A. Stress cracking
- B. Stress rupture
- C. Temper embrittlement
- D. Brittle fracture
Answer: B
NEW QUESTION # 48
Units where graphitization may be suspected are the FCCU and the _____ unit.
- A. Coker
- B. Hydrotreater
- C. Alky
- D. None of the above
Answer: A
NEW QUESTION # 49
Atmospheric corrosion is of greatest concern in:
- A. Wet climates in industrial locations.
- B. Dry climates in industrial locations.
- C. Dry climates in rural locations.
- D. Wet climates in rural locations.
Answer: A
NEW QUESTION # 50
Which of these materials is not susceptible to amine cracking?
- A. Carbon steel
- B. Both B and C
- C. 400 Series SS
- D. 300 Series SS
Answer: B
NEW QUESTION # 51
_________ is accelerated high temperature wastage of materials that occurs when contaminants in the fuel form deposits and melt on the metal surfaces.
- A. None of the above
- B. Fuel ash corrosion
- C. Dealloying
- D. Spheroidization
Answer: B
NEW QUESTION # 52
SSC is a form of ________ stress corrosion cracking.
- A. Caustic
- B. Hydrogen
- C. Polythionic
- D. Alkaline
Answer: B
NEW QUESTION # 53
The most important factors affecting graphitization are the chemistry, stress, temperature and _______.
- A. Velocity
- B. Pressure
- C. Time at exposure
- D. Ductility
Answer: C
NEW QUESTION # 54
In HF service, carbon steel operating above ________ should be closely monitored for loss in thickness and may need to be upgraded to Alloy 400.
- A. 200(o) F
- B. 160(o) F
- C. 175(o) F
- D. 150(o) F
Answer: D
NEW QUESTION # 55
(What is the minimum pH value where chloride stress corrosion cracking begins to occur?)
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Per API RP 571, chloride stress corrosion cracking (Cl-SCC) of austenitic stainless steels is strongly influenced by low pH environments in the presence of chlorides, tensile stress, and elevated temperature.
API RP 571 identifies that:
* Chloride SCC can initiate at very low pH levels
* pH values near 2 represent a threshold where aggressive chloride attack and cracking become possible
* Increasing acidity dramatically increases SCC susceptibility
Therefore, pH = 2 is the lowest and most critical value listed where chloride SCC can begin.
Referenced Documents (Study Basis):
* API RP 571 - Section on Chloride Stress Corrosion Cracking
NEW QUESTION # 56
Which of the methods are effective for finding thermal fatigue cracks?
- A. PT
- B. MT
- C. All of the above
- D. VT
Answer: C
NEW QUESTION # 57
Low creep ductility is _____ prevalent at the lower temperatures in the creep range. Or low stresses in the upper creep range.
- A. None of the above
- B. Less
- C. More
- D. Equally
Answer: C
NEW QUESTION # 58
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. 900º F
- B. 700º F
- C. 800º F
- D. 750º F
Answer: D
NEW QUESTION # 59
Cavitation is best prevented by avoiding conditions that allow the absolute pressure to fall below the ___________ of the liquid or by changing the material properties.
- A. Pressure/vapor ratio
- B. Minimum pressure
- C. Vapor pressure
- D. Maximum pressure
Answer: C
NEW QUESTION # 60
What damage mechanism can occur in wet H#S environments and is sometimes confused with wet H#S damage?
- A. Amine cracking
- B. HCl cracking
- C. Polythionic cracking
- D. Ammonia cracking
Answer: C
Explanation:
API RP 571 - Polythionic Acid Stress Corrosion Cracking:
"Polythionic acid SCC may be mistaken for wet H#S damage because both involve cracking in austenitic stainless steels under certain conditions." Thus, option D is correct.
NEW QUESTION # 61
How can temper embrittlement be prevented if a material contains critical levels of the appropriate impurity elements and is exposed in the embrittling temperature range?
- A. Use of a controlled pressurization sequence
- B. Postweld heat treatment (PWHT) of repairs
- C. Embrittlement cannot be prevented
- D. Specification of Charpy V-notch impact test
Answer: D
Explanation:
API RP 571 provides the following guidance regarding temper embrittlement:
"For materials that contain impurity levels which make them susceptible to temper embrittlement, the most effective preventive measure is to specify low FATT or Charpy impact energy requirements."
"These requirements ensure the material retains adequate toughness even if embrittlement occurs."
"While temper embrittlement itself cannot always be fully prevented during long-term exposure to temperatures between 650°F and 1070°F (343°C-577°C), its effects can be identified and mitigated through impact testing criteria." Therefore, option C is correct. Specification of Charpy V-notch testing ensures material selection accounts for embrittlement susceptibility and maintains service integrity.
NEW QUESTION # 62
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