Study on the Morphology and Oxidation Kinetics of Oxide Scale of Hot Rolling Strip Steel

The formation of oxide scale of the hot rolled strip wassimulated at different temperature by holding different time,and then,the microstructure and morphology of the oxide scale were investigated by means of scanning electron microscopy(SEM) and X-ray diffraction.The results show that the oxide scale on the surface of the steel has three layers,composed of wustite,magnetite and hematite,magnetite and hematite are compact.With the increase of the holding time at the same temperature,the thickness of the oxide scale increases.The mesh crack of the oxide scale is the main reason for the oxidation kinetic curves turn from parabolic law to linear law.The problem that the thickness of the oxide scale cannot be directly measured is solved by this simulation method,and it can provide a reference for oxide scale thickness control by adjusting the process parameters.