|
|
Fluid Flow and Inclusion Motion in a Multi-Heat Teeming Tundish for Heavy Steel Ingot |
LI Jiao1,WEN Guang-hua1,TANG Ping1,ZHU Ming-mei1, GAO Jian-jun2,LIU Hai-lan2 |
1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2. China First Heavy Industries, Fularji 161042, Heilongjiang, China |
|
|
Abstract Besides the function of molten steel supply in the casting process, tundish has a capability of decreasing the formation of macro-scale inclusions and promoting the flotation of the remaining inclusions. Both the round shape tundish and the elliptical shape tundish were studied for the multi-heat teeming ingot. The transportation of molten steel and the motion of inclusions were compared using numerical simulation and physical modeling. The results showed that the short molten steel residence time, the large dead volume, and the low efficiency in inclusion removal for the round shape tundish were obtained even when a flow control device was installed. After comparing the two kinds of tundishes with the same capacity, it indicated that in the elliptical shape tundish, the molten steel residence time was prolonged by 1.6 times and the mean residence time increased by 6%; the dead volume was decreased from 18% to 13%, the ratio of the plug volume to the dead volume increased by 68%, and the inclusion flotation efficiency increased by 17%. The trial results indicated that, after using the elliptical tundish, the equivalent diameter of single defect was decreased from 2.5 to 1.6 mm, and no intensity defect was observed. The total oxygen content was 21��10-6, which was decreased by 30%.
|
Received: 11 July 2011
Published: 28 November 2012
|
Corresponding Authors:
Jiao LI
E-mail: lijiao@cqu.edu.cn
|
|
|
|
[1] |
LI Xin-yu����YANG Mao-sheng��ZHOU Xiao-long��GUO Jun��. Torsion fatigue characteristics and crackpropagation behavior of 15Cr14Co12Mo5Ni2 gear steel[J]. Chinese Journal of Iron and Steel, 2017, 52(9): 84-91. |
[2] |
LIU Liu��FAN Jian-wen��WANG Pin��WANG Le. Generation mechanism of large inclusions during bearing steels refining process by tracer method[J]. Chinese Journal of Iron and Steel, 2017, 52(9): 34-41. |
[3] |
ZHANG Shuo��YANG Shu-feng��LI Jing-she��WANG Lin-zhu. Morphology of MnS inclusions in Y15 high sulfur free-cutting steel by tellurium treatment[J]. Chinese Journal of Iron and Steel, 2017, 52(9): 27-33. |
[4] |
ZHANG Shao- jun,YU Hong- yang,ZHU Dong- mei,NI Bin- bin,LIU Guo- yong,JIANG Hong. Influence of phase transition latent heat on controlled cooling technological requirements of �]160mm GCr15 bearing steel bar[J]. Chinese Journal of Iron and Steel, 2017, 29(9): 768-774. |
[5] |
NI Bing,LUO Zhi- guo,ZHANG Tao,YANG Wei- dong. Collision and coalescence between bubble and droplet[J]. Chinese Journal of Iron and Steel, 2017, 29(9): 717-723. |
[6] |
ZHOU Li,LIANG Jian,WANG Xiang- hong,ZHANG Ping,SHI Xiao- fang. Effect of refining slag with different basicities and low alumina content on inclusion composition of spring steel[J]. Chinese Journal of Iron and Steel, 2017, 29(8): 626-636. |
|
|
|
|