Objections of the slag defects were classified and the slag distribution was investigated. It was found that the slag defects were mainly occurred in the casting head bloom. Based on the improvement of the type of the immersion nozzle from single hole to double hole and the calculation of the head crop cutting length, it was considered that the length of the cutting head was more suitable controlled by about 1 meter under the current working condition. From the inspection of macro etch test results before and after the improvement, the proportion of slag defect decreased from 17% to 0. At the same time, from the customer quality objection feedback, slag defects had also been significantly reduced.
Key words
slag defect, head bloom, submerged entry nozzle, non-steady state
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References
[1] 刘和平,王忠英.板坯结晶器液面波动的数学物理模拟及其特点[J].钢铁研究, 2002, 2(2):47-54
[2]朱苗勇等.连铸结晶器内钢水卷渣的机理与控制[J].鞍钢技术, 2005, 2(2):653-655
[3]雷洪,许海虹等.高速连铸结晶器内卷渣机理及其控制研究[J].钢铁, 1999, 8(8):20-23
[4]陆巧彤, 杨荣光, 王新华等.板坯连铸结晶器保护渣卷渣及其影响因素的研究[J].钢铁, 2006, 41(7):29-32
[5 彭其春,于学森,熊伟 等.不同浇铸阶段高强钢铸坯洁净度研究[J].武汉科技大学学报, 2012, 35(35):401-406
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Footnotes
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