Abstract: A study on the field of fluid flow in 4-strand 25 t tundish with two different control devices has been carried out by 1 ： 2. 5 tundish water model test. And the effect of original tundish and improved tundish with modified diameter of hole for guide fluid at side of dam and its inclination, and added turbulent inhibitor on cleanliness of 325 mm x 280 mm casting bloom of bearing steel GCrl5 is tested by commercial production. Results show that the improved tundish is available to increase residence time of liquid steel in tundish, decrease dead volume fraction of tundish, increase removal rate of inclusion in liquid. Compared with the original tundish, the removal rate of total oxygen in liquid steel from improved tundish to bloom increases, the macro-inclusion content decreases by 44. 9% .

Key words: Tundish, Flow Control Device, Cleanliness

摘要： 通过1:2.5中间包水模型试验对4流25 t两种控制装置中间包内流场进行了研究,并通过工业生产试验了原中间包和改变挡墙侧导流孔孔径、倾角,并增加湍流控制的改进型中间包对325mm×280 mm GCr15钢铸坯洁净度的影响。结果表明,改进型中间包能增加钢液在中间包内的停留时间,减小中间包的死区比例,提高夹杂物的去除率。与原中间包相比,从改进型中间包到铸坯过程钢中总氧去除率提高,大型夹杂物含量降低44.9%。

关键词: 中间包, 控流装置, 洁净度