Which of the following can cause hydrogen embrittlement of carbon steel?
A.
High-temperature hydrogen attack (HTHA)
B.
Cleaning and pickling in caustic solutions
C.
Welding with wet electrodes
D.
Improper postweld heat treatment (PWHT)
The Answer Is:
D
This question includes an explanation.
Explanation:
API RP 571 defines Hydrogen Embrittlement as:
“Improper PWHT can trap hydrogen within the microstructure of carbon steel or fail to relieve residual stresses, both of which increase the risk of hydrogen embrittlement.”
“Moisture in electrodes contributes to hydrogen-induced cracking, but embrittlement from atomic hydrogen is more directly tied to heat treatment and microstructure.”
Thus, option D is the most accurate.
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