超低氧精炼时钙处理对氧化物夹杂的影响

doi:10.13228/j.boyuan.issn0449-749x.20140003

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Abstract 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 final 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 compared by calcium treatment and not calcium treatment. The results show that aluminium deoxidation products have finished 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 produce ultra-low oxygen steel, and the complex inclusions with lower melting point are liquid at the temperature of steelmaking 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.

Received: 02 January 2014 Published: 12 January 2015

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	YANG Jun

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YANG Jun. Influence of calcium treatment on oxide inclusions in ultra-low oxygen refining process[J]. Iron and Steel, 2015, 50(1): 19-26.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20140003 OR http://www.chinamet.cn/Jweb_gt/EN/Y2015/V50/I1/19

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