Abstract: Based on the structural parameters and cooling conditions of Liansteel slab caster, a numerical model of solidification & heat transfer during steel Q235B 230 mm x 1280 mm slab continuous casting is established. The temperature distribution of slab and the variation of shell thickness are studied, and the effects of superheat and casting speed on the temperature of slab and the position of solidification end are also studied. It is concluded that with the increase of superheat and casting speed, the temperature at the center and comer of billet increases as a whole. With the same other parameters, the solidification end and the disappearance position of liquid phase move backward 0. 38 m and 0. 31 m respectively with every 10℃ of superheat increase, and the solidification end and the disappearance position of liquid phase move backward 2. 06 m and 1.4 m respectively with every 0. 1 m/min increase of casting speed. Through numerical simulation, the variation of slab temperature and solidification end position are mastered.

Key words: Steel Q235B, Slab, Solidification &, Heat Transfer, Numerical Simulation

摘要： 基于涟钢板坯连铸机结构参数和冷却条件,建立了Q235B 230 mm×1 280 mm板坯连铸过程凝固传热的数值模型,研究了铸坯温度分布和坯壳厚度变化规律以及过热度和拉速对铸坯温度和凝固末端位置的影响规律。得出:随过热度和拉速的增加,铸坯中心和角部温度整体呈升高趋势,在其它参数不变的条件下,过热度每升高10℃,铸坯凝固末端和液相消失位置分别后移约0.38 m和0.31 m;拉速每升高0.1 m/min,凝固末端和液相消失位置分别后移2.06 m和1.4 m。通过数值模拟研究,掌握了铸坯温度和凝固末端位置的变化规律。