Abstract
The article presents the results of study on kinetics of high-temperature oxidation of steel 40S2. For the implementation of predictive calculations, an equation is obtained that allows metal loss to be determined depending on the temperature and the heating time. The structural features, chemical and phase composition of the scale, formed during high-temperature heating of 40S2 steel are studied. It is established that the hematite layer bordering on the furnace atmosphere has a minimum thickness of about 40 – 60 μm, the magnetite layer has a thickness of about 250 – 280 μm, the largest thickness 800 – 900 μm has a wuestite layer with secondary magnetite appeared upon cooling. The chemical and phase compositions of hematite and magnetite layers are relatively uniform in thickness and perimeter. The scale layer adjacent to the steel surface is characterized by a much greater macrostructural, chemical, and phase inhomogeneity. In addition to the wustite-magnetite mixture, iron silicates with an increased silicon content are present.
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