摘要
连铸坯的凝固过程是通过水冷结晶器和二次喷水冷却区把钢液热量带走使之转变为固体,而凝固过程的热状态决定了凝固壳生长,液相穴深度和坯壳的温度场,也影响到铸坯质量和铸机生产率。本文结合不锈钢板坯连铸的生产实践,建立了凝固传热数学模型和计算程序,根据确定的铸坯冷却的冶金准则,对不锈钢板坯二冷水的配制进行了优化计算,得到了计算二冷水的经验式.同时得到了不同断面和过热度条件下的工艺操作图,以选择合适拉速和二冷水量,预测液相穴长度和矫直点铸坯表面温度。
The continuous casting of steel is a heat extraction process in nature. The conversion of molten steel into a solid involves the heat removal from mould and spray cooling zone. Heat transfer of the solidification process is dependent on the shell growth,depth of liguid pool and temperature profile of the solid shell.It also profoundly influences the productivity of a continuous caster and steel quality. A mathematical model for heat transfer in continuously casted stain- less steel slab has been established.The model which consists of a unidi- mensional heat conduction equation and bounbary conditions has been program- med for computer solution. The effects of casting speed,superheat of molten steel,spray water intensity and section size on the metallurgical criterion have been studied by the mathematical model. We have,therefore,obtained the experimental formula for calculating spray water flux and a nomogram of operation so as to choose casting speed, spray water flux and to predict the depth of liquid pool and surface tempe- rature of slab at the position of withdrawal rolls.
出处
《化工冶金》
CSCD
北大核心
1989年第4期84-89,共6页
