《工程科学学报》录用稿，htps:/doi.org/10.13374/i,issn2095-9389.2021.12.01.002©北京科技大学2020 高速连铸结晶器内凝固传热行为及其均匀性控制 摘要高速连铸是发展新一代高效连铸的主题，对钢铁制造流程的高效与绿色化发展具有重要意义。目前我 国板坯的实际工作拉速基本在1.8mmin以下，包晶钢拉速大都1.2~1.4mmin'。拉速提升，影响结晶器 内凝固传热的不利因素更加凸显，不仅通过结晶器的热通量增加，而且保护渣的消耗量降低，使结晶器铜 壁与凝固坯壳之间的润滑变差、摩擦力上升，坯壳厚度变薄而更加不均匀，承受各种应力应变的能力下降， 从而频发漏钢和裂纹，严重影响生产顺行，解决高拉速条件下结晶器内坯壳凝固的均匀性问题成为实现高 速连铸的关键。本文从分析高拉速包晶钢板坯连铸结晶器内凝固传热行为特征入手，首先阐明拉速对结晶 器内的界面热阻、凝固坯壳的温度与应力分布的影响规律，研究发现拉速超过1.6mmn时，界面热阻明 显增加，拉速由1.4mmin提升至1.6mmin和1.8mmin时，出结晶器坯壳厚度相应减少约10%，其厚 度变得越来越不安全：在此基础上，阐述了结晶器的内腔结构、保护渣、振动与液面接制等控制结晶器内 坯壳凝固均匀性相关技术。首要应考虑优化结晶器内腔结构使其能更好迎合凝固坯亮华 研制适合包 晶钢凝固特点的连铸保护渣至关重要，控制铸坯鼓肚是保障高拉速液面稳定的 关键词高速连铸：均匀凝固：高效传热结晶器 分类号 Heat transfer behavior and homogenous solidification control for high-speed continuous casting slab mold ABSTRACT High-speed continuous casting is the theme for developing new generation of high-efficiency continuous casting technology and the most important to develop high- efficiency and green steelmaking production line.Presently,the actual casting speed for slab in China is no more than 1.8 m-minand it is in the range of 1.2-1.4 m-min for continuous casting of peritectic steel.With increasing casting speed,the negative factors affecting the solidification in continuous casting mold show more obvious,and the lubrication between mold copper plate and solidifying shell becomes worse and the fiction force increases due to the increase of heat flux and decrease of mold flux consumption, therefore the thickness of solidifying shell becomes thin and nonuniform,and its capability for resisting the all kinds of stress and strain during casting decreases,thus the occurrence of breakout and cracks with high frequency has a great influence on the production.To ensure homogenous growth,the technical issue of high-speed casting and the key for making it come true.should be solved.In this paper,the behavior of heat transfer and solidification in slab mold with high-speed casting for peritectic steel was analyzed.The effect of casting speed on the interfacial heat transfer resistance and the distribution of temperature and stress for solidifying shell in mold was investigated and it showed that the interfacial heat resistance increased obviously as the casting speed was over 1.6 m'min. Thickness of solidified shell at the exit of mold was reduced by about 10%,which became more unsafe,as the casting speed increased from 1.4 m.min to 1.6 mmin and 1.8 m.min respectively.The relative technologies such as the shape,flux,oscillation and surface fluctuation for mold with homogenous solidification were presented and discussed.For the uniformity control of peritectic steel solidification in high-speed continuous casting mold, the optimization of mold inner cavity fitting for the growth of solidifying shell should be considered firstly,and the design of mold flux adjusting to the solidification characteristics of peritectic steel is of importance,moreover,the control of strand bulging is the key for the stabilization of mold surface. KEY WRODS high-speed continuous casting;homogenous solidification;continuous casting mold with high-efficiency heat transfer高速连铸结晶器内凝固传热行为及其均匀性控制 摘 要 高速连铸是发展新一代高效连铸的主题，对钢铁制造流程的高效与绿色化发展具有重要意义。目前我 国板坯的实际工作拉速基本在 1.8 m·min-1以下，包晶钢拉速大都 1.2~1.4 m·min-1。拉速提升，影响结晶器 内凝固传热的不利因素更加凸显，不仅通过结晶器的热通量增加，而且保护渣的消耗量降低，使结晶器铜 壁与凝固坯壳之间的润滑变差、摩擦力上升，坯壳厚度变薄而更加不均匀，承受各种应力应变的能力下降， 从而频发漏钢和裂纹，严重影响生产顺行，解决高拉速条件下结晶器内坯壳凝固的均匀性问题成为实现高 速连铸的关键。本文从分析高拉速包晶钢板坯连铸结晶器内凝固传热行为特征入手，首先阐明拉速对结晶 器内的界面热阻、凝固坯壳的温度与应力分布的影响规律，研究发现拉速超过 1.6 m·min-1时，界面热阻明 显增加，拉速由 1.4 m·min-1提升至 1.6 m·min-1和 1.8m·min-1时，出结晶器坯壳厚度相应减少约 10%，其厚 度变得越来越不安全；在此基础上，阐述了结晶器的内腔结构、保护渣、振动与液面控制等控制结晶器内 坯壳凝固均匀性相关技术。首要应考虑优化结晶器内腔结构使其能更好迎合凝固坯壳的生长，研制适合包 晶钢凝固特点的连铸保护渣至关重要，控制铸坯鼓肚是保障高拉速液面稳定的关键。 关键词 高速连铸；均匀凝固；高效传热结晶器 分类号 Heat transfer behavior and homogenous solidification control for high-speed continuous casting slab mold ABSTRACT High-speed continuous casting is the theme for developing new generation of high-efficiency continuous casting technology and the most important to develop high￾efficiency and green steelmaking production line. Presently, the actual casting speed for slab in China is no more than 1.8 m·min-1 and it is in the range of 1.2~1.4 m·min-1 for continuous casting of peritectic steel. With increasing casting speed, the negative factors affecting the solidification in continuous casting mold show more obvious, and the lubrication between mold copper plate and solidifying shell becomes worse and the fiction force increases due to the increase of heat flux and decrease of mold flux consumption, therefore the thickness of solidifying shell becomes thin and nonuniform, and its capability for resisting the all kinds of stress and strain during casting decreases, thus the occurrence of breakout and cracks with high frequency has a great influence on the production. To ensure homogenous growth, the technical issue of high-speed casting and the key for making it come true, should be solved. In this paper, the behavior of heat transfer and solidification in slab mold with high-speed casting for peritectic steel was analyzed. The effect of casting speed on the interfacial heat transfer resistance and the distribution of temperature and stress for solidifying shell in mold was investigated and it showed that the interfacial heat resistance increased obviously as the casting speed was over 1.6 m·min-1 . Thickness of solidified shell at the exit of mold was reduced by about 10%, which became more unsafe, as the casting speed increased from 1.4 m·min-1 to 1.6 m·min-1 and 1.8 m·min-1 respectively. The relative technologies such as the shape, flux, oscillation and surface fluctuation for mold with homogenous solidification were presented and discussed. For the uniformity control of peritectic steel solidification in high-speed continuous casting mold, the optimization of mold inner cavity fitting for the growth of solidifying shell should be considered firstly, and the design of mold flux adjusting to the solidification characteristics of peritectic steel is of importance, moreover, the control of strand bulging is the key for the stabilization of mold surface. KEY WRODS high-speed continuous casting; homogenous solidification; continuous casting mold with high-efficiency heat transfer 《工程科学学报》录用稿，https://doi.org/10.13374/j.issn2095-9389.2021.12.01.002 ©北京科技大学 2020 录用稿件，非最终出版稿