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| Analysis on cause of peritectic steel breakout at slab joint in process of quick change of tundish |
| MEI Ning, WANG Bao-dong, LIU Yan-qiang, XIAO Hua-sheng, ZHAO Lu-ming, YANG Chun-bao |
| Steelmaking Department,Shougang Jingtang Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China |
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Abstract In order to study the problem of breakout at the slab joint of peritectic steel in the process of quick change tundish, the occurrence law was continuously investigated on site, and the breakout mechanism was analyzed by scanning electron microscope. The results show that the breakout is related to the shrinkage of slab shell and the accumulation of non-metallic inclusions at the joint mark, in which the non-metallic inclusion is mold flux. By optimizing the shell cooling and feeding program, optimizing the superheat of molten steel, adding connectors, optimizing the cleaning operation of mold flux and slag strip, and improving the casting start operation, the breakout of slab joint mark in the process of quick change of tundish of peritectic steel was effectively restrained, and the breakout rate was reduced from 1.08% to 0.
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Received: 07 April 2021
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2021, Vol. 40 
