首页> 外文期刊>鉄と鋼/Journal of the Iron and Steel Institute of Japan. >Mechanism of inclusion deposition on immersion nozzle in continuous casting and the role of generated inclusion by reaction between refractory and molten Steel
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Mechanism of inclusion deposition on immersion nozzle in continuous casting and the role of generated inclusion by reaction between refractory and molten Steel

机译:熔喷喷嘴沉积在连续铸造中的沉积机理及耐火钢之间产生的作用

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摘要

The mechanism of alumina buildup on immersion nozzles in continuous casting was studied by considering both inclusions suspended in the molten steel such as deoxidation products (suspended inclusions) and inclusions generated by chemical reactionin refractory and molten steel (reacted inclusions).(1) Two kinds of generation mechanism of reacted inclusions are considered as follows. a) alumina generated by the reaction at the interface between refractory and molten steel (interfacial reacted inclusions). b) alumina generated by nucleation when [Al][O] exceeds critical supersaturation degree in the concentration film layer near the interface between the refractory and molten steel (nucleation reacted inclusions).(2) The deposition rate of reacted inclusions is evaluated to be smaller than that of suspended inclusions. Therefore, inclusions deposited on the immersion nozzles may mainly originate from suspended inclusions.(3) At the early stage of alumina buildup, the network alumina is formed by deposition of interfacial reacted inclusions, nucleation reacted inclusions and suspended inclusions. Inclusions in the concentration film layer nucleation reacted inclusions and suspended inclusions are forced to move to the refractory due to the interfacial tension gradient formed by the concentration gradient of silicon etc. When the reaction in the refractory proceeds and oxygen feeding rate decreases, mainly suspended inclusions are deposited on the network alumina because the generation rate of reacted inclusions decreases.
机译:通过考虑悬浮在钢水中悬浮在脱氧产物(悬浮夹杂物)和熔融钢(反应夹杂物)产生的夹杂物中悬浮在连续铸造中的浸入式喷嘴对浸入式喷嘴的机理。(1)两种作用的反应夹杂物的产生机制如下。 a)氧化铝通过在耐火材料和钢水之间的界面处产生的反应(界面反应夹杂物)。 b)当[Al] [O]在耐火材料和钢水之间的界面附近的浓度膜层中的临界超饱和度(成核反应的夹杂物)附近的浓度薄膜层中的临界超饱和度产生的氧化铝。(2)评估反应夹杂物的沉积速率小于暂停的夹杂物。因此,沉积在浸没喷嘴上的夹杂物可以主要来自悬浮夹杂物。(3)在氧化铝累积的早期阶段,通过沉积界面反应夹杂物,成核反应的夹杂物和悬浮夹杂物形成网络氧化铝。浓度膜层成核中的夹杂物在耐硅等浓度梯度形成的界面张力梯度由于硅等的浓度梯度形成而被迫移动到难以移动。当耐火性收益和氧气进料速率下降时,主要悬浮夹杂物沉积在网络氧化铝上,因为反应夹杂物的产生率降低。

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