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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。
According to the solidification and high temperature mechanical properties of Q235B mild steel 230 mm × 1500 mm slab, the thermo-mechanical coupling finite element model of temperature field and stress field in slab solidification process is established and coupled by finite element analysis software MSC.Marc. The results show that under the current conditions, the length of billet metallurgy is about 33 m and the length of two-phase region is 16 m. The transition from compression to tension is carried out. The front edge of the billet is fully stretched and the billet broadens. Calculated and measured values show that Q235B steel in simulation conditions, the actual size of the slab larger than the nominal size of about 10 mm.