Abstract: Math model of heat transfer during solidification of Φ400 mm concasting round bloom of steel 34Mn5V has been established and surface temperature values at controlling location of each secondary zone calculated by the model showed no difference to that measured at production ground. It is obtained with calculation by model that the effect of liquid superheating extent on surface temperature of bloom is minor but the effect of casting speed and secondary cooling intensity on temperature of bloom is larger. Production practice showed that the automatic control secondary cooling system met the requirements of industrial concasting Φ400 mm round bloom with cast speed 0. 4 -0. 6 m/min to get quality cast bloom.

摘要： 建立了34Mn5V钢Φ400 mm圆坯连铸过程中的凝固传热数学模型,运用该模型计算得到的二冷各区控制点的表面温度与现场实测结果一致。用该模型计算得出,钢水过热度对铸坯表面温度影响较小,拉速和二冷区冷却强度对铸坯温度影响较大。生产实践表明,当生产Φ400 mm铸坯的拉速达到0.4～0.6 m/min时,自动控制的二次冷却制度能满足工业连铸要求,可得到优质铸坯。

关键词: 二冷控制, 传热模型, 圆铸坯, 表面温度