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Control measures for dented cracks at corners of thick slabs |
QIAN Zhi-you, WANG De-fu, DENG Jun-zong, GUO Rui, ZHANG Xiao-di |
The First Steelmaking Plant,Nanjing Iron and Steel United Co., Ltd., Nanjing 210000, Jiangsu, China |
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Abstract Corner dent cracks are a common quality defect in the production of thick slab continuous casting. With the increase of slab thickness, the incidence of corner dent cracks continues to increase, which has become an important factor restricting the quality improvement and variety development of thick slabs. For slabs with 260 mm×2 800 mm and 320 mm×2 800 mm sections, the position, morphology and structure of the depression cracks in the corners were studied, the influencing factors of the solidification and shrinkage behavior of the slab corners in the mold were analyzed, and the control method of corner depression crack was obtained.Through the development of curved narrow surface copper plate mold, adapt to the billet shell shrinkage in the mold. The cooling time of secondary cooling zone is prolonged by increasing the logarithm of narrow edge foot roll. The crystallization temperature and heat transfer performance can be increased by increasing the viscosity of the slag. Control measures such as adjusting mold vibration parameters effectively solve the problem of corner sag crack in thick slab, and the incidence of dented cracks at the corners of 260 mm×2 800 mm and 320 mm×2 800 mm was reduced to 0.41% and 0.86%, which creates favorable conditions for hot loading and hot sending of slab.
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Received: 13 February 2022
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