作　　者： ; ; ; ;

机构地区： 齐齐哈尔大学机电工程学院

出　　处： 《钢铁》 2006年第1期66-70,共5页

摘　　要： 研究了实验室条件和工业规模试制条件下耐火钢层流冷却和热变形后停留时间对热轧带钢铁素体晶粒尺寸和带钢屈强比的影响。结果表明,延长热变形后停留时间可以增大铁素体晶粒尺寸;实验室喷淋冷却速度较低(10℃/s),铁素体晶粒尺寸较大,屈强比(YR)为0.78;第1次工业试验层流冷却速度快(30℃/s),使铁素体晶粒细化,屈强比偏高(YR=0.84);第2次工业生产试制的带钢屈强比可以由原来的0.84降低至0.79,而且不降低生产效率。 As the spray cooling rate was low, the ferrite grains of fire-resistant steel were relative coarse and yield ratio （YR） was 0.78 under laboratory conditions. However, in the first industrial experiment of fire-resistant steel, the high cooling rate of laminar cooling（30℃/s） refined the ferrite grain so that the yield ratio became higher （YR=0. 84）. The effect of the delay after hot rolling on the grain size of ferrite was investigated by using Gleeble 1500 thermomechanical simulator. It was found that prolonging the delay time at elevated temperature can increase the grain size of ferrite and this phenomenon has been proved by second industrial experiment. In this way, the yield ratio can be decreased from 0.84 to 0. 79 and the production efficiency isn＇t reduced.

关 键 词： 热轧带钢 停留时间 屈强比 层流冷却

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]