As per API RP 571 Section 5.1.4.2 (Metal Dusting):
“Metal dusting is a type of carburization attack that typically occurs in high carbon activity environments, with temperatures generally between 900°F and 1200°F (480°C to 650°C), although damage has been reported as low as 600°F (315°C).”
Therefore, the commonly accepted operational range is best described by Option A: 600°F–1200°F (315°C–650°C).
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