Abstract: In recent years, a new solid-state steelmaking process has attracted extensive attention, and this process makes pig iron directly casted and then decarburized in an oxidizing atmosphere for steelmaking. This scheme can significantly shorten the production process of thin strips and reduce inclusions in the steel. This research based on the Fe-C alloy sheets of different thickness as the foundation exploreed the kinetics of gas-solid decarbonization in Ar-CO-CO2 at different temperature following high temperature gas-solid reaction decarburization mechanism. The results showed that the diffusion of carbon to the reaction interface was the restricted link for the decarburization reaction, with the increase of the decarburization temperature and holding, the content of decarburization improving. The decarburization rate was also improved by reducing the thickness of Fe-C alloy sheets under the same condition. The relationship between decarburization rate and decarburization temperature of 2 mm Fe-C alloy sheets can be approximately expressed as k=-0.144+1.183×10-4T. The results illustrated that the solid phase decarburization reaction can be approximate to the first-order reaction in Ar-CO-CO2, and the apparent activation energy of the whole decarburization reaction (Ea) was 124.7 kJ/mol.
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2021, Vol. 35 
