Discussion on Inclusions Movement Behavior in Tundish on Non-Isothermal Condition
According to the industrial measurement data,the average liquid temperature in ladle is usually 30-40℃ higher than that in tundish.The liquid with higher temperature tends to flow upward,while the liquid with lower temperature tend to flow downward.So when jets with different temperature mix together,it forms “natural convection flow pattern,which has a big difference from the case of isothermal mixing.During the continuous casting process,the higher temperature liquid from ladle flows into the tundish,with a extra heat loss in the tundish,it forms the natural convection flow pattern tin the tundish during the entire period of casting process,and the flow pattern in the tundish is changing all the time.And the “natural convection makes flow pattern change in the tundish,which is different from isothermal flow pattern as many researchers do.And inclusions removal rate in the tundish depends strongly on the tundish flow pattern.In this paper,ladle and tundish is considered to be a combined system,and then movement regular of inclusions in tundish is discussed on this non-isothermal condition.The emphasis in this paper is very different from others.This paper reveals that:(i)for isothermal case,the plug flow region,dead region and backmix regions volume fraction in tundish is 67.5%,1.6%,30.9%respectively,while for the non-isothermal case,the different regions volume fraction is 75.7%,6.1%,18.2%,which is quite different from the isothermal case;(ii)the incoming flow from ladle tend to flow along the tundish bottom at the middle-later period of casting process,and inclusions tend to flow with the incoming flow,which is very bad for inclusions-removing,and it might cause quality of slab declined.
ladle tundish non-isothermal inclusions natural convection flow
Hongwei PAN Baodong WANG Leichuan WANG Chenxi JI Zhi ZENG Shusen CHENG
Shougang Research Institute of Technology,Beijing 100043,Beijing,China Shougang Jingtang United Iron & Steel Co.,Ltd University of Science and Technology Beijing,100083,Beijing,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
793-796
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）