炼钢

• 凝固与浇铸 • 上一篇    下一篇

小方坯连铸机末端电磁搅拌位置及连铸工艺优化实践

周 力,高书成,蒋栋初,马建超,徐 昊   

  1. (江苏沙钢集团 淮钢特钢股份有限公司,江苏 淮安223002)
  • 接受日期:1900-01-01 出版日期:2018-04-05

Optimization on F-EMS position and casting parameters of billet caster

  • Accepted:1900-01-01 Online:2018-04-05

摘要: 为改善国内某钢厂生产的小方坯低倍组织及中心偏析,建立了断面为200 mm×200 mm的凝固传热数学模型,在综合考虑钢种、拉速等参数的影响前提下,对最优的末端电磁搅拌(F-EMS)位置进行了分析,最终将F-EMS调整至距结晶器液面9.85 m的位置处。开展了连铸工艺优化、恒拉速浇铸攻关,最终显著改善了白亮带、中心缩孔等低倍缺陷,并将中低碳钢中心偏析度控制在1.05左右,将高碳钢中心偏析度控制在1.10左右。此外,优化试验结果表明,将结晶器冷却水量由130 m3/h降低至110 m3/h,有利于抑制柱状晶生长、扩大等轴晶区比例。

关键词: 小方坯, 末端电磁搅拌, 拉速, 结晶器冷却, 中心偏析

Abstract: In order to improve the macrostructure and center segregation of billet, heat transfer model of solidification of billet with 200 mm×200 mm section was established. The best position of F-EMS was analyzed considering both steel grade and casting speed. And finally, the F-EMS was moved to 9.85 m away from the mold level. After optimization on casting parameters and constant speed casting, the macro structure defects such as white band and central porosity were eliminated, and center segregation of low carbon steel and medium carbon steel was controlled about 1.05, center segregation of high carbon steel was controlled about 1.10. Moreover, experiment result shows that decreasing cooling water quantity of crystallizer from 130 m3/h to 110 m3/h can prevent the growth of columnar grains and increase the proportion of equiaxed grain.

Key words: billet, F-EMS, casting speed, mold cooling, center segregation