Abstract：In May, 2011, the slab casting machine with the biggest section went into production in Nanyang Hanye Special Steel Co., Ltd. In the initial stage of production, many longitudinal surface cracks appeared on the slab, which resulted in high unqualified rate of the rolled plates . Through field survey and data analysis, we found longitudinal surface cracks were related to cooling intensity of the casting mold and uneven secondary cooling. By adopting a series of control measures, such as regulating the raising casting speed curve for the first heat of the tundish, adjusting the insertion depth of the submersed nozzle and strengthening equipment management, the problem of longitudinal surface cracks on the heavy slab was effectively solved and the first qualified rate of the surface of the casting slab was stably raised to 99.2%.
王新，许少普，赵迪，乔华伟. 400 mm×2 100 mm特宽特厚板坯表面纵裂成因及控制措施[J]. 中国钢铁期刊网, 2013, 32(2): 35-37.
WANG Xin,XU Shao-pu,ZHAO Di,QIAO Hua-wei. The Causes and Control Measures for Longitudinal Surface Cracks on 400 mm×2 100 mm Specially Thick and Wide Steel Plates. Chinese Journal of Iron and Steel, 2013, 32(2): 35-37.
2013, Vol. 32 
