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【安阳市自然科学优秀学术论文选登】——二冷电磁搅拌工艺优化

放大字体  缩小字体 发布日期:2020-08-06  浏览次数:175

摘要:为解决铸坯中心偏析、疏松以及中间裂纹等缺陷,引进开发了二冷区电磁搅拌工艺,通过理论数据计算,并结合现场冷却工艺参数,确定了搅拌辊安装位置。后期使用过程,根据不同钢种特性,进行多组参数试验,分析其对铸坯等轴晶率的影响,确定中碳钢、低碳钢等系列钢种搅拌参数,达到热连轧、中厚板产线对铸坯内部质量的轧制要求。

关键字:中心偏析 中间裂纹 二冷电磁搅拌 等轴晶率

Process Optimization of Electromagnetic Stirring In Secondary Cooling Zone

WANG xiang-song,GAO xin-jun

(Anyang Iron & Steel Co. Anyang 455004,China)

Abstract:In order to eliminate the defects in slab such as center segregation, porosity and intermediate crack,and so on, electromagnetic stirring technology in secondary cooling zone was introduced and developed. The installation position of stirring roll was determined by theoretical data calculation and field cooling process parameters. In the later production stage, according to the characteristics of different steel grades, a series of parameter tests were carried out to analyze the effect of parameters on equiaxed grain ratio of the slab, and the stirring parameters of medium carbon steel and low carbon steel were determined to meet the rolling requirements of hot continuous rolling and plate production line for internal quality of slab.

Keywords: center segregation, intermediate crack, electromagnetic stirring in secondary cooling zone,the ratio of equiaxed grain

前言

安钢第二炼轧厂3#双流板坯连铸机,厚度230mm,由于炉机不匹配引起的拉速波动较大,且扇形段采用固定辊缝,铸坯中心偏析、疏松较为严重,供应轧制厚规格板材所需坯料时,中心缺陷问题更甚。

前期做了大量的工艺优化,例如,采取低过热度浇注、二次冷却工艺优化、辊缝收缩优化等措施,但低倍质量仍无法满足部分品种钢生产要求。经过多方交流、考察,引进开发二冷电磁搅拌工艺,通过优化电磁搅拌的各项工艺参数以达到最佳的冶金效果,以期改善铸坯中心偏析、疏松等缺陷。


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