Free API API-571 Practice Test & Real Exam Questions

Exam Code/Number: API-571
Exam Name/Title: Corrosion and Materials Professional
Certification Provider: API
Corresponding Certification: ICP Programs

Exam Questions: 151
Updated On: Jun 24, 2026

Question #71

Carbonate stress corrosion cracking and alkaline stress corrosion cracking are:

A. Mechanisms that affect carbon steels and austenitic stainless steels.

B. Different only in the level of alkalinity needed to initiate attack.

C. Not preventable by post-fabrication stress relieving of weldments.

D. Closely related corrosion mechanisms.

Discussion 0

Correct Answer: D Vote an answer

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Question #72

Corrosion rates associated with hydrofluoric (HF) acid would be expected to increase if:

A. Temperature and water content increase

B. Temperatures are below 150°F (66°C) and there is less than 3% water

C. HF acid concentration increases

D. Copper-nickel alloy is used

Discussion 0

Correct Answer: A Vote an answer

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Question #73

300 series austenitic stainless steels susceptible to polythionic acid stress corrosion cracking (PTA SCC) can become sensitized when heated in the range of:

A. 1650°F to 1725°F (899°C to 941°C)

B. 750°F to 1500°F (400°C to 815°C)

C. 400°F to 675°F (204°C to 357°C)

D. 1200°F to 1650°F (622°C to 900°C)

Discussion 0

Correct Answer: B Vote an answer

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Question #74

(Grooving in cooling water tubes could be due to:)

A. Microbiologically induced corrosion

B. Electric resistance welds

C. Flow-induced erosion

D. Underdeposit corrosion

Discussion 0

Correct Answer: C Vote an answer

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Question #75

(In an RBI assessment, sulfidation was identified as a credible damage mechanism and assigned a corrosion rate of 8 mpy (0.20 mm/yr). Which of the following are critical factors in sulfidation?)

A. Concentration of sulfur species, operating temperature, and metallurgy

B. Operating temperature and corrosion rate

C. Concentration of sulfur species and operating temperature

D. Corrosion rate and concentration of sulfur species

Discussion 0

Correct Answer: A Vote an answer

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Question #76

What is the most effective way to mitigate aqueous organic acid corrosion in overhead streams?

A. Water washing

B. Increase the overhead temperature

C. Injection of filming amine

D. Injection of neutralizer

Discussion 0

Correct Answer: D Vote an answer

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Question #77

Nitriding of steels becomes most severe at temperatures above:

A. 200°F (95°C)

B. 900°F (480°C)

C. 500°F (260°C)

D. 600°F (315°C)

Discussion 0

Correct Answer: B Vote an answer

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Question #78

The remaining life of a component susceptible to creep damage can be cut in half by a/an:

A. increase in temperature of 25°F (15°C).

B. sudden change in temperature.

C. increase in stress of 10%.

D. increase in operating unit throughput.

Discussion 0

Correct Answer: A Vote an answer

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Question #79

(Chloride stress corrosion cracking of 300 series stainless steel initially becomes a concern at a metal temperature above:)

A. 180 °F (82 °C)

B. 140 °F (60 °C)

C. 100 °F (38 °C)

D. 212 °F (100 °C)

Discussion 0

Correct Answer: B Vote an answer

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Question #80

Polythionic acid stress corrosion cracking is:

A. Rarely found in process furnaces.

B. Typically localized and may not be evident until a leak appears.

C. Found only in low carbon grades of austenitic stainless steel.

D. Identified by transgranular cracking on the process side of equipment and piping.

Discussion 0

Correct Answer: B Vote an answer

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