API API-571 Question Answer
Which of the following will experience the highest oxidation corrosion rate at 1350°F (732°C)?
Alloy 800H
Type 310 stainless steel
Type 304L stainless steel
9 Cr low-alloy steel
API RP 571 under Oxidation:
“Carbon steels and low alloy steels, such as 9 Cr, have poor oxidation resistance at temperatures above 1000°F (540°C), rapidly losing thickness.”
“Stainless steels with higher Cr and Ni content (like 310) have superior oxidation resistance.”
Thus, 9 Cr steel will corrode fastest at 1350°F, making option D correct.
TESTED 07 Jul 2025
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