API 571 QUESTIONS AND ANSWERS
WITH SOLUTIONS 2024
1. __________ is a change in the microstructure of certain carbon steels and
0.5 Mo steels after long term operation in the 800º F to 1100º F range.
A. Graphitization
B. Softening
C. Temper Embrittlement
D. Creep - ANSWER A
2. What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - ANSWER B
3. _________ is the result of cyclic stress caused by variations in temperature.
A. Creep
B. Thermal Fatigue
C. Cyclic Cracking
D. Stress Corrosion Cracking - ANSWER B
4. General or localized corrosion of carbon steels and other metals caused by dissolved salts, gases,
organic compounds or microbiological activities is called ________.
A. Flue Gas Corrosion
B. Atmospheric Corrosion
C. Cooling Water Corrosion
D. None of the Above
E. All of the Above - ANSWER C
,5. What structure is 410 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - ANSWER A
6. The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no
evidence of ductility or plastic deformation is called _________.
A. 885º F Embrittlement
B. Temper Embrittlement
C. Stress Corrosion Cracking
D. Brittle Fracture - ANSWER D
7. What structure is 409 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - ANSWER D
8. Low alloy steels contain a maximum of _______ chrome.
A. 5%
B. 6%
C. 7.5%
D. 9% - ANSWER D
9. Which of the following can be affected by 885º F Embrittlement?
A. 410 SS
B. 430 SS
C. 308 SS
,D. Alloy 2205
E. A, B and D - ANSWER E
10. For 5Cr-0.5Mo, what is the threshold temperature for creep?
A. 500º F
B. 800º F
C. 600º F
D. 700º F - ANSWER B
11. ________ has been a major problem on coke drum shells.
A. Thermal fatigue
B. Stress cracking
C. Erosion
D. Temper embrittlement - ANSWER A
12. Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped,
transgranular and oxide-filled.
A. Axial
B. Diagonal
C. Transverse
D. Angular - ANSWER C
13. Inspection for wet H2S damage generally focuses on _____ and ______.
A. Weld seams
B. Nozzles
C. Trays
D. Down comers
E. A and B - ANSWER E
, 14. ________ is a form of erosion caused by the formation and instantaneous collapse of innumerable
tiny vapor bubbles.
A. Condensate corrosion
B. Cavitation
C. Dew-Point corrosion
D. Atmospheric corrosion - ANSWER B
15. With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the
water evaporates quickly.
A. Decrease
B. Increase
C. Stay the same
D. None of the above - ANSWER B
16. Which of the following metals is the most anodic?
A. Zinc
B. Carbon Steel
C. Nickel
D. Monel - ANSWER A
17. 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. Ferritic
C. Anodic
D. Cathodic - ANSWER B
18. Soil to Air interface areas are usually more susceptible to corrosion than the rest of the structure
because of ___________ and __________ availability.
A. Moisture
WITH SOLUTIONS 2024
1. __________ is a change in the microstructure of certain carbon steels and
0.5 Mo steels after long term operation in the 800º F to 1100º F range.
A. Graphitization
B. Softening
C. Temper Embrittlement
D. Creep - ANSWER A
2. What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - ANSWER B
3. _________ is the result of cyclic stress caused by variations in temperature.
A. Creep
B. Thermal Fatigue
C. Cyclic Cracking
D. Stress Corrosion Cracking - ANSWER B
4. General or localized corrosion of carbon steels and other metals caused by dissolved salts, gases,
organic compounds or microbiological activities is called ________.
A. Flue Gas Corrosion
B. Atmospheric Corrosion
C. Cooling Water Corrosion
D. None of the Above
E. All of the Above - ANSWER C
,5. What structure is 410 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - ANSWER A
6. The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no
evidence of ductility or plastic deformation is called _________.
A. 885º F Embrittlement
B. Temper Embrittlement
C. Stress Corrosion Cracking
D. Brittle Fracture - ANSWER D
7. What structure is 409 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - ANSWER D
8. Low alloy steels contain a maximum of _______ chrome.
A. 5%
B. 6%
C. 7.5%
D. 9% - ANSWER D
9. Which of the following can be affected by 885º F Embrittlement?
A. 410 SS
B. 430 SS
C. 308 SS
,D. Alloy 2205
E. A, B and D - ANSWER E
10. For 5Cr-0.5Mo, what is the threshold temperature for creep?
A. 500º F
B. 800º F
C. 600º F
D. 700º F - ANSWER B
11. ________ has been a major problem on coke drum shells.
A. Thermal fatigue
B. Stress cracking
C. Erosion
D. Temper embrittlement - ANSWER A
12. Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped,
transgranular and oxide-filled.
A. Axial
B. Diagonal
C. Transverse
D. Angular - ANSWER C
13. Inspection for wet H2S damage generally focuses on _____ and ______.
A. Weld seams
B. Nozzles
C. Trays
D. Down comers
E. A and B - ANSWER E
, 14. ________ is a form of erosion caused by the formation and instantaneous collapse of innumerable
tiny vapor bubbles.
A. Condensate corrosion
B. Cavitation
C. Dew-Point corrosion
D. Atmospheric corrosion - ANSWER B
15. With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the
water evaporates quickly.
A. Decrease
B. Increase
C. Stay the same
D. None of the above - ANSWER B
16. Which of the following metals is the most anodic?
A. Zinc
B. Carbon Steel
C. Nickel
D. Monel - ANSWER A
17. 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. Ferritic
C. Anodic
D. Cathodic - ANSWER B
18. Soil to Air interface areas are usually more susceptible to corrosion than the rest of the structure
because of ___________ and __________ availability.
A. Moisture
