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NEW QUESTION # 40
Geometry, stress level, number of cycles and _________ are the predominate factors in determining the fatigue resistance of a component.
- A. Pressure
- B. Velocity
- C. Material properties
- D. Temperature
Answer: C
NEW QUESTION # 41
__________ caustic concentrations and ________ temperatures increase the likelihood and severity of cracking with caustic embrittlement.
- A. Decreasing, Decreasing
- B. Decreasing, Increasing
- C. Increasing, Increasing
- D. Increasing, Decreasing
Answer: C
NEW QUESTION # 42
Hardness is primarily an issue with SSC. Typical low strength carbon steels should be controlled to produce weld hardness less than ________.
- A. 225 BHN
- B. 200 BHN
- C. 240 BHN
- D. 237 BHN
Answer: B
NEW QUESTION # 43
The presence of which additional substance(s) will accelerate the corrosion of steel in the presence of sulfur compounds at high temperature?
- A. Sulfates
- B. Oxygen
- C. Chlorides
- D. Hydrogen
Answer: C
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 # 44
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. Sulfuric
- C. Both A and C
- D. Hydrofluoric
Answer: C
NEW QUESTION # 45
A nickel-based buttering layer is often used when welding austenitic stainless steels to carbon steels to avoid dissimilar weld metal cracking because:
- A. Nickel base alloys are much softer than austenitic stainless steels.
- B. The coefficient of thermal expansion is better suited to avoid cracking.
- C. You can avoid the need for post weld heat treatment to lower hardness.
- D. Austenitic stainless steels are susceptible to chloride cracking.
Answer: B
Explanation:
In TR 942-B and API RP 582, it is emphasized:
"Nickel-based buttering is often used as an intermediate layer to reduce thermal stress mismatch during welding of ferritic and austenitic materials."
"Nickel alloys have a coefficient of thermal expansion closer to that of both stainless steels and carbon steels, reducing stress concentrations and mitigating dissimilar weld cracking."
"This technique also assists in achieving metallurgical compatibility and mitigating solidification cracking." Hence, option C is correct as it directly relates to minimizing thermal expansion mismatches.
NEW QUESTION # 46
Which of these materials is susceptible to 885ยบ F embrittlement?
- A. Both A and B
- B. 5Cr-1Mo
- C. 400 Series SS
- D. Duplex SS
Answer: A
NEW QUESTION # 47
Caustic embrittlement is a form of stress corrosion cracking characterized by surface-initiated cracks that occur in piping and equipment exposed to caustic, primarily adjacent to non-PWHT welds. Which of the following materials is the most resistant to embrittlement?
- A. Low alloy steels
- B. Nickel based alloys
- C. 400 Series SS
- D. Carbon steel
Answer: B
NEW QUESTION # 48
At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?
- A. Softening
- B. Hardening
- C. Ductility
- D. Creep
Answer: D
NEW QUESTION # 49
Which of the following weldments is most susceptible to dissimilar metal cracking when operating at high temperatures?
- A. Carbon steel to Incoloy 800
- B. Carbon steel to Monel 400
- C. Carbon steel to Inconel 625
- D. Carbon steel to 316 stainless steel
Answer: D
Explanation:
Dissimilar Metal Cracking (DMC) is a form of high-temperature cracking that frequently occurs in weld joints between carbon steel and austenitic stainless steel (such as Type 316 SS) due to differences in thermal expansion coefficients and mechanical properties.
From API RP 571 Section 5.2.3.1 (Dissimilar Metal Weld Cracking):
"Cracking frequently occurs in weld joints between ferritic and austenitic materials such as carbon steel to
300 series stainless steels due to thermal expansion mismatch during high temperature operation." Therefore, Option D (Carbon steel to 316 stainless steel) is the most susceptible combination and the correct answer.
NEW QUESTION # 50
Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF). Time-to-failure decreases as the hardness increases.
- A. 241 BHN
- B. 225 BHN
- C. 237 BHN
- D. 247 BHN
Answer: C
NEW QUESTION # 51
_______ is the primary alloying agent that affects resistance to oxidation.
- A. Molybdenum
- B. Silicon
- C. Chromium
- D. Aluminum
Answer: C
Explanation:
Explanation/Reference:
NEW QUESTION # 52
Where is PASCC normally located?
- A. Adjacent to welds
- B. On impellers
- C. At stress risers
- D. At flanges
Answer: A
NEW QUESTION # 53
Annealed steels are more resistant to Spheroidization than normalized steels. _________ grained steels are more resistant than ______ grained steels.
- A. Course, Fine
- B. Non-PWHT, PWHT
- C. PWHT, Non-PWHT
- D. Fine, Course
Answer: A
NEW QUESTION # 54
With short term overheating, time to failure will ___________ as internal pressures or loading decrease.
- A. None of the above
- B. Decrease
- C. Increase
- D. Remain the same
Answer: C
NEW QUESTION # 55
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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.
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