邯钢中碳微合金钢板坯轻压下位置优化
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摘要
板坯连铸轻压下实施过程中,合理的压下参数是影响铸坯内部质量的决定性因素。根据邯钢中碳微合金钢板坯连铸生产条件,建立凝固传热模型,结合板坯射钉试验研究,预测其凝固进程和压下位置。在此基础上,开展轻压下工业试验,分析了压下位置对铸坯中心偏析的影响。结果表明,在拉速为0.85m/min、过热度为20~30℃、二冷比水量为0.59L/kg的条件下,邯钢中碳微合金钢板坯连铸压下区间中心固相率为0.2~0.7,对应位置为16.42~21.62m,位于7~9号扇形段内。与采用6~8号扇形段压下相比,优化方案明显改善了板坯中心偏析和疏松,东西两侧不均匀偏析和横截面V型偏析显著减弱。
In the soft reduction process,the inner quality of slab is strongly affected by the reduction parameters.Based on continuous casting conditions of medium-carbon microalloyed steel slab,a solidification heat transfer model was built to predict the solidification process and reduction location,which was validated by the nail shooting test.Then,the soft reduction plant trails were carried out and the effect of reduction location on the center segregation was investigated.The results showed that the center solid fraction of the reduction range was 0.2-0.7 for mediumcarbon microalloyed steel slab,corresponding to 16.42-21.62 mfrom the meniscus and within No.7-9 segements.Compared with the original reduction location(No.6-8 segements),the center segregation and porosity were improved significantly,especially the nonuniform segragtion at slab east and west sides and the V segregation in the cross section.
In the soft reduction process,the inner quality of slab is strongly affected by the reduction parameters.Based on continuous casting conditions of medium-carbon microalloyed steel slab,a solidification heat transfer model was built to predict the solidification process and reduction location,which was validated by the nail shooting test.Then,the soft reduction plant trails were carried out and the effect of reduction location on the center segregation was investigated.The results showed that the center solid fraction of the reduction range was 0.2-0.7 for mediumcarbon microalloyed steel slab,corresponding to 16.42-21.62 mfrom the meniscus and within No.7-9 segements.Compared with the original reduction location(No.6-8 segements),the center segregation and porosity were improved significantly,especially the nonuniform segragtion at slab east and west sides and the V segregation in the cross section.
引文
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[3]江中块,蔡兆镇,牛振宇,等.1 650板坯压下过程热/力学行为及压下工艺优化[J].中国冶金,2017,27(7):22.
[4]侯自兵,成国光,饶添荣.连铸板坯中心线偏析形成机制与轻压下技术[J].钢铁,2011,46(11):45.
[5]张开钧,王新华,刘洋,等.轻压下对管线钢连铸坯中心偏析影响的研究[J].炼钢,2009,25(1):51.
[6]林启勇,朱苗勇.连铸板坯轻压下过程压下率理论模型及其分析[J].金属学报,2007,43(8):847.
[7]成日金,王志衡,倪红卫,等.Q345钢宽板坯连铸凝固末端位置的研究[J].炼钢,2013,29(2):66.
[8]刘珂,孙齐松,王立峰,等.不同厚度连铸板坯的合理总轻压下量[J].钢铁研究学报,2017,29(2):111.
[9]许志刚,王新华,周力,等.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.
[10]徐李军,仇圣桃,张兴中.板坯凝固参数测定及轻压下工艺优化[J].连铸,2014(4):1.
[11]董其鹏,张炯明,赵新凯,等.板坯凝固末端重压下的模拟研究[C]//第十届中国钢铁年会暨第六届宝钢学术年会论文集.上海:中国金属学会,2015:947.
[12]潘贻芳,祭程,张晓博,等.宽厚板坯连铸二冷工艺开发与应用[J].中国冶金,2012,22(9):42.
[13]李峰,张炯明.板坯动态二冷配水系统的开发与应用[J].中国冶金,2008,18(3):11.
[14]SU W,WANG W L,LUO S,et al.Heat transfer and central segregation of continuously cast high carbon steel billet[J].Journal of Iron and Steel Research,International,2014,21(6):565.
[15]谢桂强,徐李军,邹锦忠,等.射钉法在铸坯凝固终点预报模型中的应用[J].中国冶金,2016,26(3):42.
[16]Takahashi T,Hagiwara I.Study on solidification and segregation of stirred ingot[J].Journal of the Japan Institute of Metals,1965,29(12):1152.
[17]Ogibayashi S,Yamada M,Mukai T,et al.Continuous Casting Method:U.S.Patent 4687047[P].1987-08-18.