API RP 945, dedicated to environmental cracking in amine units, states:
“Carbon steel is widely used in amine systems but is particularly susceptible to localized corrosion, under-deposit corrosion, and stress corrosion cracking, especially in high-pressure or rich amine environments.”
“Proper control of amine quality, oxygen ingress, and temperature is critical to avoid accelerated corrosion in carbon steel equipment.”
Thus, carbon steels are the most commonly affected materials, making option C correct.
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