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Certification Path

The API Corrosion and Materials certification path includes only one API-571 Certification Exam.

API Corrosion and Materials Professional Sample Questions (Q64-Q69):

NEW QUESTION # 64
Sigma phase embrittlement can occur in which of the following piping materials operating at temperatures of 1000°F to 1750°F (538°C to 954°C)?

Answer: D

Explanation:
As per API RP 571 Section 5.3.2.2 (Sigma Phase Embrittlement):
"Sigma phase embrittlement occurs in austenitic stainless steels (like 300 series) and duplex stainless steels exposed to 1000°F to 1800°F (540°C to 980°C)... This embrittlement results in a significant loss of toughness and ductility."
* Sigma phase is not a concern in Monel (nickel-copper alloy) or 5Cr steels.
* 400 series are ferritic and not typically affected by sigma phase.
Hence, Option A (300 series stainless steel) is correct.


NEW QUESTION # 65
Which of the following is not a prime candidate for thermal fatigue?

Answer: B


NEW QUESTION # 66
_________ is a selective corrosion mechanism in which one or more constituents of an alloy are preferentially attacked leaving a lower density often porous structure.

Answer: B


NEW QUESTION # 67
Which of the following is related to all wet H#S damage mechanisms?

Answer: D

Explanation:
API RP 571, in its discussion on Wet H#S Damage, including HIC, SOHIC, and SSC, consistently identifies a shared mechanism:
"All wet H#S-related damage mechanisms involve the absorption of atomic hydrogen, formed at the steel surface by the corrosion reaction in the presence of H#S."
"The absorbed hydrogen may diffuse into the steel, accumulate at trap sites, and cause cracking or blistering." (Reference: API RP 571, Section 4.2.2.7 - Wet H#S Damage Mechanisms) Thus, hydrogen absorption and permeation is a unifying mechanism across all these damage modes.
Therefore, option D is correct.


NEW QUESTION # 68
Refractory anchor material must be compatible with the _________ of the base metal

Answer: C


NEW QUESTION # 69
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