轻压下参数对连铸板坯半宏观偏析的影响

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摘要研究了压下位置、压下率和压下量等轻压下参数对连铸板坯半宏观偏析的影响。研究结果表明，中心线偏析由相互独立的半宏观偏析点组成，半宏观偏析面积比与中心最大碳偏析比有良好的正相关关系，因此改善连铸板坯中心线偏析的关键在于降低半宏观偏析面积比。轻压下对于降低半宏观偏析面积比有重要影响。工业试验结果表明，当压下位置位于固相率大于0.75、压下率为1.2mm/m以及压下量为4.5mm时，能够显著降低半宏观偏析面积比，从而改善连铸板坯的中心线偏析。

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	许志刚

关键词 ：压下位置, 压下率, 压下量, 半宏观偏析, 面积比, 偏析比

Abstract：The effects of soft reduction parameters, including soft reduction position (fs), soft reduction ratio(RSR) and soft reduction amounts(ASR), on the semi-macro segregation in continuously cast slabs were investigated in present work. The results reveal that centerline segregation is composed of independent semi-macro segregates, which the areal fraction is proportional to the maximum segregation index of carbon. Thus, the key to improving the centerline segregation is to decreasing the area fraction of semi-macro segregates. Soft reduction is an effective measure to reduce the areal fraction of semi-macro segregates. The results of the industrial experiments show that the areal fraction of semi-macro segregates is reduced remarkably as fs>0.75, RSR=1.2mm/m and ASR=4.5mm, consequently, the centerline segregation is improved.

收稿日期: 2013-06-04 出版日期: 2014-03-28

引用本文:

许志刚，王新华，周力，黄福祥，尹雨群. 轻压下参数对连铸板坯半宏观偏析的影响[J]. 钢铁, 2014, 49(3): 36-41. XU Zhi-gang,WANG Xin-hua,ZHOU Li,HUANG Fu-xiang,YIN Yu-qun. Effects of Soft Reduction Parameters on Semi-Macro Segregation in Continuously Cast Slab. Iron and Steel, 2014, 49(3): 36-41.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2014/V49/I3/36

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