316不锈钢连铸结晶内坯壳凝固规律研究

Study on solidified regularities of shell in mould of 316 stainless steel continuous casting

为研究连铸过程中拉速及过热度对钢水凝固的影响,采用商业有限元软件ANSYS,利用生死单元技术,对316不锈钢板坯生长情况进行了模拟.模型采用3-D模型,分别计算了拉速为0.4,0.5,0.6,0.8 m/min及过热度为30,40,50℃时坯壳出口温度、角部温度及出口厚度的变化.结果表明,随着拉速和过热度的提高,坯壳出口温度及角部温度均升高,坯壳的出口厚度减薄,而角部温度波动随拉速提高,越来越小;在低拉速条件下坯壳最薄处均在横向距角部40 mm左右位置处,高拉速条件下坯壳最薄处向角部靠近.

The growth process of 316 stainless slab was simulated by means of commercial finite element software ANSYS and element birth and death technology in order to study the influence of casting speed and superheat on molten steel solidification in the continuous casting process.Using three dimensional model,the changes of slab shell outlet temperature,corner temperature and solidified shell thickness were calculated when casting speed is 0.4,0.5,0.6,0.8 m/min and superheat is 30,40,50 ℃.The results showed that with the increase of casting speed and superheat,the outlet and the corner temperature of slab shell rose,while the outlet thickness became thin;the undulatory range of the corner temperature got smaller with increasing the casting speed;the minimum shell thickness was about 40 mm on the transverse direction under low casting speed,and the location of the minimum shell thickness was close to the corner of the solidified shell under high casting speed.