Non-stressed relieved __________ is susceptible to stress corrosion cracking when in contact with moist HF vapors in the presence of oxygen.

Non-stressed relieved __________ is susceptible to stress corrosion cracking when in contact with moist HF vapors in the presence of oxygen.
A . Carbon steel
B . Alloy 400
C . 300 Series SS
D . 400 Series SS

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Answer: B