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| Formation Mechanism of the Transverse Cracks in Ultra-Thick Slabs for Shouqin |
| ZHEN Xin-gang1,ZHU Zhi-yuan1,YANG Jian-ping1,WANG Yu-long1,LIU Yang2,ZHAO Xin-yu2 |
1. Steelmaking Department， Shouqin Metal Material Co., Ltd., Qinhuangdao 066000, Hebei, China
2. Shougang Research Institute of Technology, Beijing 100043, China |
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Abstract Factors influencing transverse cracks such as the thickness of slabs, the carbon and niobium content in liquid steel, the casting speed, the dynamics model and the technology of 3D sprays, were investigated. The results show that, because of the defects in the dynamic secondary cooling model, for the ultra-thick slabs with low casting speed, by the minimum water restrictions of the secondary cooling zone, and under the comprehensive action of the straightening force and the thermal stress, if the total strain of shell is more than its critical strain, the transverse cracks finally forms along the grain boundary, located at the vibrating mark trough distance slab corner 150-500mm.
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Received: 04 September 2012
Published: 18 June 2013
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2013, Vol. 48 
