大断面圆坯连铸温度场的数值模拟

通过大型通用有限元软件ANSYS建立铸坯凝固过程有限元仿真分析模型,在拉速0.25～0.35m/min,钢水过热度20℃的条件下,对20钢Φ中600mm和40Cr钢Φ500 mm圆坯连铸过程进行了计算和分析,得出距液面0～32 m时铸坯表面温度变化曲线。计算结果表明,当20钢Φ600 mm圆坯的拉速为0.3 m/min时,结晶器出口坯壳厚度为30.9 mm,结晶器出口铸坯温度为1050℃,二冷区表面最低温度978℃铸坯在距液面19.71 mm处完全凝固。Φ600 mm圆坯连铸机20钢生产实践表明,拉速0.25 m/min,结晶器出口铸坯表面温度为1048℃,二冷区表面最低温度为918℃,与模拟结果相似。

Numerical Simulation on Temperature Field of Casting Large-Size Round Bloom

The finite element simulation analysis model has been established by using full-scale general finite element software ANSYS,and the calculation and analysis on casting process of 0.20C steel≤600 mm round bloom and 40Cr steelΦ500 mm round bloom with casting rate 0.25～0.35 m/min and liquid overheating extent 20℃has been carried out to get the curves of round bloom surface temperature changing at distance 0 -32 m from liquid surface in casting process.Calculation results show that as the casting rate of 0.20C steelΦ600 mm round bloom is 0.3 m/min,the thickness of bloom shell at outlet of mold is 30.9 mm,the bloom surface temperature at outlet of mold is 1 050℃and the lowest temperature of surface at secondary cooling zone is 978℃,the casting bloom solidifies in full at the distance 19.71 m from liquid surface. The production practice by≤600 mm round bloom caster casting 0.20C steel show that with casting rate 0.25 m/min,the surface temperature of casting bloom at outlet of mold is 1 048℃and the lowest surface temperature of bloom in secondary cooling zone is 918℃.that are similar to simulated results.