以某钢厂圆坯连铸机为研究对象，建立了连铸坯凝固传热模型。在不同拉速下对280 mm断面圆坯二次冷却过程进行仿真优化，确定了16MnNb钢合适的二冷制度。根据仿真结果，在最小工作拉速(0.9 m/min)下，矫直点处铸坯内弧表面中心温度为947℃，有效避开了铸坯的二次低延性区。在最大工作拉速(1.2 m/min)下，铸坯出结晶器时，其凝固坯壳厚度为19 mm，二冷初期产生漏钢等质量问题的可能性较小。不同拉速下，横断面温度场分布均匀。经低倍检测发现，铸坯表面及内部质量良好，无裂纹、疏松、缩孔等质量缺陷。
The heat transfer model for solidification of continuous casting billet has been established, based on a round caster in a steel plant. The simulation and optimization were carried out at different drawing speeds when continuous cast-ing billet with diameter of 280 mm was in secondary cooling process. Suitable secondary cooling scheme of 16MnNb steel was determined. When the drawing speed is the minimum of 0.9 m/min, the inner arc surface temperature of billet is 947℃at straightening point, which can effectively avoid the secondary low ductile zone. When the round billet comes out of mould at the maximum drawing speed (1.2 m/min), the thickness of the solidified shell is 19 mm. Some problems such as breakout hardly happen. The section temperature is uniformly distributed under different drawing speed conditions. The macro inspecting indicates that the round billet surface and internal quality are good. Crack and contraction cavities and other defects were not found.
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