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| Effect of solidification reduction process on center compactness of continuous casting bloom |
| ZHAO Jun-pu 1,2，LIU Liu1，RAO Jin-yuan3 |
（1. Metallurgical Technology Institute， Central Iron and Steel Research Institute， Beijing 100081， China
2. School of Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China
3. Hubei Xinyegang Steel Co.， Ltd.， Huangshi 435001， Hubei， China） |
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Abstract In order to improve the center compactness of continuous casting bloom，the effect of post solidification reduction process on the center shrinkage cavity existing in the bloom was studied. The deformation behavior of shrinkage cavity during solidification reduction was analyzed using thermo-elastic-plastic model. The results revealed that the center compactness of bloom can be effectively improved when reduction technology was applied after complete solidification，and the effect is 22.5% higher than hot rolling under the same deformation. With the increase of reduction amount，the size of the center shrinkage cavity is significantly reduced. However，it is difficult to completely eliminate the large size shrinkage cavity due to the limited reduction amount of post solidification reduction. To further eliminate the shrinkage cavity，it is advisable to increase the soft reduction rate to 0.02 mm/s at the end of solidification to reduce the initial size of shrinkage cavities，or increase the post solidification reduction amount. Post solidification reduction technology was applied to the production of continuous casting bloom SA-213 T12. Experiment result shows that most of the center shrinkage cavities have been welded. The size of the remaining shrinkage cavities is reduced from 8 mm to 2 mm，and the number is reduced by 50%.
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Received: 18 January 2018
Published: 11 October 2018
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2018, Vol. 53 
