API 571 Exam Actual Questions and
Answers 2026
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 -
correct answer ✅A
2. What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic -
correct answer ✅B
3. _________ is the result of cyclic stress caused by variations in
temperature.
A. Creep
B. Thermal Fatigue
,API 571 Exam Actual Questions and
Answers 2026
C. Cyclic Cracking
D. Stress Corrosion Cracking -
correct 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 -
correct answer ✅C
5. What structure is 410 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic -
correct answer ✅A
,API 571 Exam Actual Questions and
Answers 2026
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 -
correct answer ✅D
7. What structure is 409 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic -
correct answer ✅D
8. Low alloy steels contain a maximum of _______ chrome.
A. 5%
B. 6%
C. 7.5%
, API 571 Exam Actual Questions and
Answers 2026
D. 9% -
correct 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 -
correct 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 -
correct answer ✅B
11. ________ has been a major problem on coke drum shells.
A. Thermal fatigue
Answers 2026
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 -
correct answer ✅A
2. What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic -
correct answer ✅B
3. _________ is the result of cyclic stress caused by variations in
temperature.
A. Creep
B. Thermal Fatigue
,API 571 Exam Actual Questions and
Answers 2026
C. Cyclic Cracking
D. Stress Corrosion Cracking -
correct 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 -
correct answer ✅C
5. What structure is 410 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic -
correct answer ✅A
,API 571 Exam Actual Questions and
Answers 2026
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 -
correct answer ✅D
7. What structure is 409 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic -
correct answer ✅D
8. Low alloy steels contain a maximum of _______ chrome.
A. 5%
B. 6%
C. 7.5%
, API 571 Exam Actual Questions and
Answers 2026
D. 9% -
correct 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 -
correct 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 -
correct answer ✅B
11. ________ has been a major problem on coke drum shells.
A. Thermal fatigue
