连铸板坯三维二冷动态配水与精准压下研究与应用  

Research and application of three-dimensional dynamic secondary cooling and accurate soft reduction for continuous casting slab

作　　者：张炯明 周青海 尹延斌 吴星星 刘华阳 ZHANG Jiong-ming;ZHOU Qing-hai;YIN Yan-bin;WU Xing-xing;LIU Hua-yang(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《工程科学学报》2021年第12期1666-1678,共13页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51834002,52104320)。

摘　　要：在现有工艺条件下,校验和完善二冷区铸坯凝固传热计算数学模型,开发三维二冷配水模型,解决目前设备状况下冷却水分布不均匀对铸坯温度的影响,从而控制铸坯表面质量,特别是铸坯的角部裂纹,同时对板坯连铸二冷配水制度进行改进和优化,使之满足高效连铸生产条件和改善铸坯质量的需要.提出压下参数计算公式,结合所开发三维二冷配水模型,优化现有压下工艺,提出并应用精准可控单段压下、非稳态压下控制,集中解决连铸板坯中心偏析、中心疏松和缩孔等内部质量问题.同时优化模型数据库,使之数据更加完备,模型计算更加准确,同时模型具备异钢种混浇过程二冷及压下控制功能,能够进行凝固终点W形预测与控制,可进一步提高模型适用性和准确性.模型开发并成功在多家钢厂现场应用,有效改善了铸坯裂纹和偏析等铸坯表面和内部的质量问题.The surface and corner cracks of continuous casting billet form during the continuous casting process,especially in medium-carbon steel.Surface defects of such billets are directly related to the secondary cooling process of continuous casting,while the center deviation of the billet,center shrinkage,and center loosening in medium-carbon steel,medium-carbon alloy steel,and high-carbon steel are especially prominent.Such quality defects are related to the secondary cooling and press-down process of continuous casting.These two defects are the main factors restricting continuous casting production.The secondary cooling of the continuous casting process has an important influence on the surface and internal quality of the slab,especially the temperature of the slab corners,which directly affects the surface quality of the slab.Under the existing process conditions,the mathematical model for calculating the solidification heat transfer of the slab in the secondary cooling zone is calibrated and improved,and a three-dimensional secondary cooling model is developed to solve the influence of uneven cooling due to water distribution on the temperature of the slab.This controls the surface quality of the slab,especially the corner cracks of the slab,and improves and optimizes the slab continuous casting secondary cooling system to improve the slab quality.An equation for calculating the soft reduction parameters is proposed,and the existing soft reduction process is optimized by combining the developed three-dimensional secondary cooling model with the proposed and applied controllable single-stage soft reduction and unsteady soft reduction control to solve the internal quality problems,such as central segregation,central porosity,and shrinkage of the continuous casting slab.At the same time,the model database is optimized to make the data more complete and the model calculation more accurate.This model adds the technology of mixed casting of different grades of steel and the technology of predicting and controlling the W

关 键 词：连铸板坯 二冷配水 精准压下 双目标温度 裂纹 偏析 

分 类 号：TF777.1[冶金工程—钢铁冶金]