| The modern long route steel is represented by blast furnace-converter-continuous casting process which facing with serious oxidization and inclusion problem. here proposes a novel short process(twin-roll iron strip casting+high temperature gas-solid decarburization) for carbon steel strip production, which derived from decarburization of oriented silicon steel annealing treatment.This research is oriented to achieve decarburization and less Fe oxidization of high carbon Fe-C alloy ribbons by high temperature gas-solid reaction decarburization mechanism. The range of decarbonization temperature and atmosphere condition is explored for the further study.The experiment explored the methods of smelting master alloy and the feasibility of melt spinning method and copper mould spray casting for the preparation of Fe-C alloy ribbons. Copper mould spray casting is feasible for the research and ribbons can be controlled within 0.5~3.0mm.Ar and H2 mixture was introduced through a water bath and was injected into the horizontal furnace for decarburizing the Fe-C alloy ribbons. By the orthogonal design and analysis experimental methods, the experiment has been carried out.The results show that higher decarbonization temperature,water temperature and longer decarbonization time benefit to decarbonization. But the best significant factor is higher decarbonization temperature, the final factor is water temperature.The results show that when decarbonization time is 25 min and 50 min,the average carbon content of ribbons(thickness:2mm, 1mm, 0.5mm) with 3.99~4.09%C can be decreased to 1.12%, 0.41%, 0.017% and 0.21%, 0.01%, 0.002% respectively under conditions of decarbonization temperature 1140℃ and water temperature 60℃.Mixed gas condition has significant influence on the Fe oxidization. Fe oxide can not be found when water temperature ≤ 60℃ or gas flow rate ≤ 300ml/min. When water temperature reaches 70℃ or gas flow rate 450ml/min, Fe oxide presents. |
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