热带钢超快速冷却条件下的对流换热系数研究  

Heat Transfer Coefficient of Hot Rolled Strip During Ultra Fast Cooling Process

作　　者：王昭东[1] 袁国[1] 王国栋[1] 刘相华[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《钢铁》2006年第7期54-56,64,共4页Iron and Steel

基　　金：国家863高技术产业化研究资助项目(2003AA33G010)

摘　　要：建立了热带钢超快速冷却过程的导热微分方程,采用有限差分方法计算了薄带钢实现超快速冷却(对于4 mm以下的薄带钢,冷却速率可达300℃/s)所需的带钢表面对流换热系数。同时,在实验室条件下采用厚度为20 mm的钢板进行了超快速冷却试验,得到了超快速冷却条件下的带钢表面对流换热系数与冷却水流量的关系。结果表明,在一定水流量范围内随着冷却水量的增加,带钢表面换热系数逐渐增加;采用所确定的换热系数对不同厚度钢板得到的温降曲线与实测值吻合较好,具有较高的精度。Based on the equation of heat conduction for strip under ultra fast cooling, cooling rate up to 300℃/s for hot strip below 4 mm, the convective heat transfer coefficient was calculated by finite difference method. And on the basis of the ultra-fast cooling experiments of 20 mm thickness hot strip, the coefficient of convective heat transfer of hot strip under ultra-fast cooling was investigated in the laboratory. The relation between the coefficient of the convective heat transfer and cooling water flow was obtained. The result shows that in certain flow rate range, with the increase of water flow rate, the heat transfer coefficient is increased gradually. The calculated heat transfer coefficient is in good agreement with measured.

关 键 词：热带钢 超快速冷却 换热系数 

分 类 号：TG335.5[金属学及工艺—金属压力加工]