316不锈钢板坯结晶器内凝固过程模拟与验证

Simulation and verification of solidification process of stainless steel 316 in the mould during continuous casting

采用三维有限元技术,研究了连铸过程中高温区δ铁素体含量对钢水凝固的影响。通过对316不锈钢板坯浇铸过程的模拟,获得了凝固过程中δ铁素体含量对坯壳出口温度、角部温度及坯壳厚度变化的影响规律。研究发现铁素体含量能够极大增加坯壳纵向温度,但对横向温度的梯度的变化影响较小。通过分析横向温度的变化,确定在距角部40 mm左右处坯壳最薄。同时,也研究了出口坯壳厚度变化规律,随着δ铁素体含量的增加,出口处坯壳厚度逐渐减小,厚度差逐渐变大。

The effect of 3 ferrite content in the high temperature zone on the solidifica- tion of the liquid steel in the process of continuous casting is studied by 3-dimensional fi- nite element technology. By means of simulating the process of casting the slab of stain- less steel 316 the law of effects of 3 ferrite content on the variation of the outlet temper- ature of the solidification shell, corner temperature and shell thickness in the process of solidification is obtained. It is found that the contents of the 3 ferrite have great effects on the gradient of temperature along the casting direction, but only have very little effects on the variations of the lateral temperature gradient. By calculating the results it＇s determined that the shell in the vicinity of the area 40 mm away from the corner sec- tion is the thinnest. In the meanwhile the law of the shell thickness variations at the outlet is investigated systematically and results show that with increase of the 3 ferrite content the thickness of the shell at the outlet reduces and the difference of the thickness becomes greater gradually.