研究了采用LF精炼顶渣控制技术对钢液进行超低氧冶炼时，钙处理对钢中非金属夹杂物的影响。试验在转炉出钢时采用铝终脱氧，LF精炼过程采用强脱氧、高碱度、强还原性精炼顶渣对钢液进行超低氧冶炼，比较了钙处理和不钙处理的钢液中非金属夹杂物转变的情况。结果表明，采用精炼顶渣控制技术冶炼超低氧钢时，钢液不需要进行钙处理就能实现铝脱氧产物Al2O3→MgO·Al2O3尖晶石→CaO-MgO-Al2O3类复合夹杂物的转变，得到炼钢温度下呈液态的复合氧化物夹杂，这些液态的夹杂物容易通过碰撞长大上浮去除，得到高洁净度的钢液，且残留在钢液的氧化物夹杂为较低熔点的复合氧化物，在浇注过程中不会产生水口结瘤。
The influence of calcium treatment was studied on non-metallic inclusions when control technology of refining top slag in ladle furnace was used in ultra-low oxygen refining process. Sufficient aluminium was added to test heats for fi-nal deoxygenation during BOF tapping, and the refining top slag with high basicity and strong reducibility in ladle furnace was used to produce ultra-low oxygen steel, and the transformation of non-metallic inclusions in molten steel was com-pared by calcium treatment and not calcium treatment. The results show that aluminium deoxidation products have fin-ished the transformation of Al2O3→MgO · Al2O3 spinel→CaO-MgO-Al2O3 complex inclusions with lower melting point and need not calcium treatment to molten steel when using the control technology of ladle furnace refining top slag to pro-duce ultra-low oxygen steel, and the complex inclusions with lower melting point are liquid at the temperature of steelmak-ing and easy removed to obtain very high cleanliness steel by collision and coalescence and flotation. Furthermore, the problems of nozzle clogging in casting operations are not happen because the remaining oxide inclusions in steel are lower melting point complex inclusions.
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