Abstract
Pure iron and binary alloys containing 1, 2, 3, and 5 wt % Si were reacted at with a carbon-supersaturated, flowing gas mixture of 68% CO, 26% , and 6% ( and ). Alloy reaction products consisted of a subsurface zone of internally precipitated , an external scale of , and a voluminous superficial deposit of coke containing particles of cementite and silica. Coking and metal dusting rates both increased with alloy silicon level. Internal oxidation rates also increased with silicon concentration but net scaling rates decreased. It is proposed that increasing volume fractions of silica in the scale provides more sites for graphite nucleation, which leads to accelerated disintegration of the scale surface. This accounts for the more rapid dusting, faster coking (catalyzed by more particles), and thinner scales.
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