To prevent hydrogen embrittlement, use lower strength steels and _________ to temper the microstructure, improve ductility and reduce residual stresses.

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To prevent hydrogen embrittlement, use lower strength steels and _________ to temper the microstructure, improve ductility and reduce residual stresses.
A . Alloys
B . Preheat
C . PWHT
D . All of the above

Answer: C

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