连铸板坯角部结疤缺陷的研究与实践
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摘要
对宝钢梅山炼钢厂连铸板坯角部结疤缺陷形成过程与机理进行了研究。通过对板坯结疤的宏观形貌分析和形成全过程的现场跟踪观察,初步判断板坯角部结疤缺陷产生于结晶器内弯月面位置。其原因在于弯月面初生坯壳的破裂、溢流、冷凝过程造成了坯壳角部凝固沟溢流。据此,提出了相应的工艺改进措施,即减少保护渣的烧结性,严格控制结晶器振动偏差,做好结晶器均匀冷却的控制,从而保证结晶器铜板质量及与结晶器内初生坯壳受力相关的设备功能的精度,避免板坯角部结疤缺陷的产生。
In this paper,the formation procedure and mechanism of scarring defects at the corners of slabs produced by Baosteel Meishan Steelmaking plant were systematically investigated. It preliminarily found that the scarring defects formed at the mold meniscus through analysis to macroscopic morphology with field tracking. And it was ascribed to the overflow of solidification furrow at the corner of shell caused by the rupture,overflow and condensation of the primary shell of the meniscus. According to the analysis,the following measures are suggested to diminish the defects:the sinterability of mold powder should be reduced. While the deviation of crystallizer vibration as well as the cooling homogeneity should also be strictly controlled. Thus,the quality of the mold copper plate and the functional accuracy of the equipment related to the forces of the primary shell in the mold must be guaranteed. The corner scarring defects of slabs then will be diminished
In this paper,the formation procedure and mechanism of scarring defects at the corners of slabs produced by Baosteel Meishan Steelmaking plant were systematically investigated. It preliminarily found that the scarring defects formed at the mold meniscus through analysis to macroscopic morphology with field tracking. And it was ascribed to the overflow of solidification furrow at the corner of shell caused by the rupture,overflow and condensation of the primary shell of the meniscus. According to the analysis,the following measures are suggested to diminish the defects:the sinterability of mold powder should be reduced. While the deviation of crystallizer vibration as well as the cooling homogeneity should also be strictly controlled. Thus,the quality of the mold copper plate and the functional accuracy of the equipment related to the forces of the primary shell in the mold must be guaranteed. The corner scarring defects of slabs then will be diminished
引文
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[3]周学禹,程玉君,王伟,等.微合金钢连铸坯表面横裂纹的研究[J].连铸,2011,36(1):5.
[4]钱龙,何金平,张永锟,等.武钢CSP薄板坯SPA-H结疤的成因及控制[J].武钢技术,2011,49(2):9.
[5]蔡开科.《连铸结晶器振动与铸坯表面质量》[M].冶金工业出版社,2016.
[6]迟景灏.《连铸保护渣》[M].东北大学出版社,1993.
[7]董长征,曾建立,潘艳华,等.CSP薄板坯连铸SPA-H结疤缺陷分析与控制[C]//宝钢学术年会,2013.
[8]张峰,叶有林,陆勋波,等.方坯连铸换水口专用保护渣的选择及应用试验[J].连铸,2015,40(6):34.
[9]邱东升,吴国庆,李亮,等.不同工艺条件下小方坯连铸结晶器内的热力学行为[J].连铸,2018,43(1):13.
[10]王承顺,李六一,成国光,等.304不锈钢板坯浸入式水口形状对铸坯凝固组织的影响[J].连铸,2017,42(6):26.