Causes Analysis and Improvements of Tundish Nozzle Clogging for Aluminized Steel
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摘要: 基于中包水口堵塞物的荧光扫描结果,分析冶炼含铝钢的生产过程数据,从精炼过程脱氧程度、精炼后期钙处理效果、精炼处理时间以及连铸二次氧化程度,阐述引起中包水口堵塞的原因。分析结果显示:Al2O3、CaO·6Al2O3、CaO·2Al2O3和MgO-Al2O3是堵塞中包水口的主要物质,精炼渣系控制不当、钙处理不充分是引起水口堵塞的主要原因。针对上述原因提出相应改进措施,使中包水口堵塞发生几率由8%降低到3%以下。Abstract: In this paper the fluorescence scanning results from the tundish nozzle clogging material in combination with production data including deoxidizing degree of refining process,the effect of calcium treatment,the refining treatment time and the secondary oxidation degree in continuous casting process had been investigated to identify the causes of tundish nozzle clogging when producing the aluminized steel. It is found out that Al2O3,CaO·6Al2O3,CaO·2Al2O3 and MgO-Al2O3 are the main components in the clog of tundish nozzle. Clogging has caused by irrelevant refining slag system and insufficient calcium treatment. Therefore a modified process had been utilized which led to reduction of the tundish nozzle clogging probability from 8% to below 3%.
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Key words:
- tundish /
- aluminized steel /
- clogging /
- calcium treatment /
- deoxidization /
- protective casting
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