Pass API-571 Exam in First Attempt Guaranteed 100% Cover Real Exam Questions [Jul-2025]
Valid API-571 test answers & API API-571 exam pdf
Who should take the API-571 exam
The API Corrosion and Materials API-571 Exam certification is an internationally-recognized validation that identifies persons who earn it as possessing skilled as Advanced Corrosion & Materials Professional Certification. If a candidate wants significant improvement in career growth needs enhanced knowledge, skills, and talents. The API Corrosion and Materials API-571 Exam certification provides proof of this advanced knowledge and skill. If a candidate has knowledge of associated technologies and skills that are required to pass API Corrosion and Materials API-571 Exam then he should take this exam.
NEW QUESTION # 11
Which of the following damage mechanisms are most closely related because they occur in similar environments?
- A. Carburization and metal dusting
- B. Carbonate corrosion and CO# corrosion
- C. Fuel ash corrosion and flue gas dew-point corrosion
- D. Oxidation and sulfidation
Answer: D
Explanation:
According to API RP 571:
"Oxidation is the reaction of metal and oxygen to form oxides. It generally occurs in high temperature environments with excess oxygen."
"Sulfidation is a high temperature corrosion mechanism that occurs due to interaction between sulfur- containing compounds and metal surfaces, forming metal sulfides. Like oxidation, sulfidation occurs in environments above 500 °F (260 °C)."
"Both oxidation and sulfidation can occur concurrently, particularly in mixed environments of oxygen and sulfur." (Reference: API RP 571, Sections 5.1.1 and 5.1.3 - Oxidation & Sulfidation) These two mechanisms are thermally activated and occur in elevated temperature conditions found in heaters, furnaces, and piping systems. Hence, option B is correct.
NEW QUESTION # 12
Galvanized steel components should not be welded to ________ due to LME.
- A. 400 Series SS
- B. Carbon steel
- C. Duplex SS
- D. 300 Series SS
Answer: D
NEW QUESTION # 13
With sulfuric acid corrosion, the presence of oxidizers can _______ the corrosion rate.
- A. Increase
- B. Stabilize
- C. Eliminate
- D. Decrease
Answer: A
NEW QUESTION # 14
Weld heat affected zone graphitization is most frequently found in the heataffected zone adjacent to welds in a narrow band, corresponding to the low temperature edge of the heat affected zone, In multi-pass welded butt joints, these zones overlap each other covering the entire cross section. Because of its appearance, this type of graphitization is called________.
- A. Radii
- B. None of the above
- C. Eyebrow
- D. Half-moon
Answer: C
NEW QUESTION # 15
Both sulfide stress corrosion cracking and stress-oriented hydrogen-induced cracking are most often found in:
- A. Areas where there is significant hydrogen blistering.
- B. Steel weldments.
- C. Hardened steels.
- D. Areas with temperatures above 300°F (149°C).
Answer: C
Explanation:
API RP 571 explains that both Sulfide Stress Cracking (SSC) and SOHIC are:
"Strongly influenced by material hardness. Carbon and low alloy steels with hardness exceeding 22 HRC (248 Brinell) are most susceptible."
"They occur in hardened steels under tensile stress, in the presence of wet H#S environments." (Reference: API RP 571, Sections 4.2.2.1 and 4.2.2.7 - SSC and SOHIC) Therefore, hardened steels are the common factor for both mechanisms, making option C the correct choice.
NEW QUESTION # 16
__________ 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. SOHIC
- B. LME
- C. AET
- D. SCC
Answer: B
NEW QUESTION # 17
Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called
________.
- A. Brittle fracture
- B. Stress cracking
- C. Temper embrittlement
- D. Stress rupture
Answer: D
Explanation:
Explanation
NEW QUESTION # 18
What standard refers to Risk-Based-Inspection?
- A. RP 579
- B. RP 568
- C. RP 588
- D. RP 581
Answer: D
NEW QUESTION # 19
The presence of which additional substance(s) will accelerate the corrosion of steel in the presence of sulfur compounds at high temperature?
- A. Chlorides
- B. Sulfates
- C. Hydrogen
- D. Oxygen
Answer: A
Explanation:
According to API RP 571, Section 4.2.1.1 - Sulfidation, and also echoed in API RP 939-C, the presence of certain compounds significantly increases sulfidic corrosion:
"Chlorides are known to accelerate sulfidation and other high-temperature corrosion mechanisms by forming low-melting eutectics and breaking down protective scales on alloy surfaces."
"Chlorine-containing species also interfere with the formation of stable sulfide or oxide scales, leading to more aggressive metal loss." Therefore, chlorides are the most critical accelerant among the listed substances in high-temperature sulfur compound environments, making option C correct.
NEW QUESTION # 20
Although cracks may be seen visually, crack detection for caustic stress corrosion cracking is best detected by WFMT, EC, RT and ______.
- A. All of the above
- B. PT
- C. ACFM
- D. MT
Answer: C
NEW QUESTION # 21
With cooling water corrosion, _________ oxygen content tends to ________ carbon steel corrosion rates.
- A. Increasing, decreasing
- B. Decreasing, decreasing
- C. Increasing, increasing
- D. Decreasing, increasing
Answer: C
NEW QUESTION # 22
Type 304L SS is satisfactory for phosphoric acid concentration of 100% up to about _________. Type 321 is required from there to 225º F.
- A. 100º F
- B. 120º F
- C. 150º F
- D. 140º F
Answer: B
NEW QUESTION # 23
The major factors affecting high temperature sulfidation are the temperature, the presence of hydrogen, the H2S concentration and the ________.
- A. Velocity
- B. Alloy composition
- C. Pressure
- D. Stress
Answer: B
NEW QUESTION # 24
HCL acid corrosion is found in several units, especially _______ and ________, units, hydroprocessing units and catalytic reformer units.
- A. Crude, Vacuum
- B. Vacuum, Amine
- C. Amine, crude
- D. Crude, Alkylation
Answer: A
NEW QUESTION # 25
For exchangers where the cooling water chemistry is poorly maintained, what can be done to improve corrosion resistance?
- A. Lower the water velocity
- B. Increase the process side temperature above 212°F (100°C)
- C. Upgrade the metallurgy of the exchanger
- D. Increase the tube diameter
Answer: C
Explanation:
From API RP 571, under Cooling Water Corrosion:
"If proper water treatment is not feasible or consistently maintained, upgrading the metallurgy of exchanger tubes to more corrosion-resistant materials such as stainless steel or titanium may be necessary."
"This is especially important in seawater or brackish water cooling applications or in once-through systems." (Reference: API RP 571, Section 4.3.1.1 - Cooling Water Corrosion) Thus, the most effective long-term solution in cases of uncontrolled water quality is to upgrade metallurgy, making option C correct.
NEW QUESTION # 26
Dissimilar weld metal cracking can be aggravated by _______.
- A. Pressure
- B. Thermal cycling
- C. Cyclic stresses
- D. Stress
Answer: B
NEW QUESTION # 27
_________ 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. Dealloying
- C. Spheroidization
- D. Fuel ash corrosion
Answer: D
NEW QUESTION # 28
Sulfur and chlorine species in fuel will form sulfur dioxide, sulfur trioxide and hydrogen chloride within the combustion products. At low enough temperatures, these gases and the water vapor in the flue gas will condense to form _________ acid.
- A. Hydrochloric
- B. Both A and C
- C. Hydrofluoric
- D. Sulfuric
Answer: B
NEW QUESTION # 29
Annealed steels are more resistant to Spheroidization than normalized steels. _________ grained steels are more resistant than ______ grained steels.
- A. Fine, Course
- B. Course, Fine
- C. Non-PWHT, PWHT
- D. PWHT, Non-PWHT
Answer: B
NEW QUESTION # 30
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