Formation Mechanism and Control of Transverse Corner Cracking of Containing Boron Steel Slab
WANG Zhao-yang1,2,JI Cheng1,GONG Wen-xu2,ZHU Miao-yong1
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China 2. Tianjin Iron and Steel Co., Ltd., Tianjin 300301, China
Abstract：The optical microscope and SEM were applied to analyze the formation mechanism of transverse corner cracks of boron micro-alloyed steel slab. It is found that the cracks occur at relatively low corner temperatures of slab in straightening section that is in No.3 brittle zone of boron steel firs. The corner temperature of slab is relatively low due to the relatively low casting speed, irrational distribution of secondary cooling water and sprayers. Increasing casting speed and decreasing the cooling water flux at slab corners in the straightening section for mild cooling were performed first to control corner temperature above the upper limit in No.3 brittle zone of boron steel. Combined with the adjustment of dynamic, as a result, the corner temperature of slab was increased apparently, transverse corner cracking and internal quality of slab was greatly improved.
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WANG Zhao-yang1,2,JI Cheng1,GONG Wen-xu2,ZHU Miao-yong1. Formation Mechanism and Control of Transverse Corner Cracking of Containing Boron Steel Slab. Iron and Steel, 2012, 47(5): 35-38.
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2012, Vol. 47 
