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| Causes and control of surface crack on continuous casting billets of wide and thick plates |
| SUN Li-gang, JIA Sheng, LI Xin |
| CSP Plant, Baotou Iron and Steel Group Co., Ltd., Baotou 014010, Nei Mongol, China |
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Abstract In view of the surface cracks in batch in the thin slab continuous casting and rolling mill of CSP Plant of Baotou Steel. main causes of surface cracks on the slab were analyzed by investigating the types of surface defects, crack morphologies and characteristics, combined with the continuous casting process conditions, molten steel quality and equipment conditions.The measures of optimizing the vibration parameters, controlling the nitrogen content of molten steel, improving the vibration accuracy, adjusting the performance of protective slag and improving the quality of secondary cooling water were put forward to improve the surface defects of the casting billet, and the obvious results were obtained, and the surface cracks of the casting billet were effectively controlled.
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Received: 07 April 2020
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2020, Vol. 39 
