Abstract: According to solidifying and mechanical characteristics of low carbon steel Q235B 230 mm x 1500 mm slab at elevated temperature, a couple thermal and mechanical finite element analysis model for temperature field and stress field of slab during casting process has been established, and the coupling calculation is carried out by using definite element software MSC. Marc. Results show that at present situation the metallurgical length is about 33 m and the length of two- phase region is 16 m； the slab shell transits from compression status to tension status and the complete tension status is at front of inside of shell ； there is spread phenomenon of slab； and the calculated value and measured value all indicate that in simulation condition the real dimension of Q235B steel slab is larger than normal dimension by about 10 mm.

Key words: 230 mm x 1500 mm Slab, Continuous Casting Process, Thermal-Mechanical Coupled Model, Distribution of Temperature, Bulging, Spread

摘要： 根据Q235B低碳钢230 mm×1500 mm板坯凝固和高温力学特性,建立铸坯凝固过程温度场和应力场热-力耦合有限元分析模型,采用有限元分析软件MSC.Marc进行耦合计算。结果表明,在当前工况下,铸坯冶金长度约33 m,两相区长度16 m;坯壳由压缩向拉伸过渡,在坯壳内侧前沿为完全拉伸状态,铸坯存在展宽现象;计算值和实测值均表明,Q235B钢在模拟工况下,实际铸坯尺寸比公称尺寸大10 mm左右。

关键词: 230 mm x 1500 mm板坯, 连铸过程, 热力耦合模型, 温度分布, 鼓肚, 宽展