连铸参数对中间包内控流元件冶金性能的影响

根据相似原理,以浇铸Φ380 mm铸坯的28 t 3流T型中间包为原型,通过实验相似比λ=1:2水模型,研究了拉速0.3～0.9 m/min、液位600～1200 mm连铸条件下,控流元件对中间包内流场特性的影响。结果表明,当实际生产的中间包液位为500 mm左右时,拉速<0.4 m/min时,控流元件改善其流场的作用不明显,不需加入控流元件;当拉速≥0.4 m/min和<0.7 m/min时,可选用带挡墙结构的中间包;当拉速≥0.7 m/min,可考虑挡墙加湍流抑制器的结构,以优化中间包内流场特性。通过对中间包内流场的分析得出,设置控流元件时,应尽量降低注流混乱度并使钢水湍动能尽可能多的消耗在浇铸区。

Effect of Casting Parameters on Metallurgical Function of Flow Control Devices in Tundish

Based on similarity theory, according to a 28-t prototype 3-strand T-type tundish for casting Φ380 mm bloom, the effect of flow control devices on characteristics of flow field in tundish in casting conditions of casting speed- 0. 3 - 0. 9 m/min and liquid level-600 ~ 1 200 mm has been studied by using experimental similarity ratio λ= 1： 2 water model. Results show that in condition of tundish liquid level about 500 mm in commercial production status, with casting speed <0. 4 m/min, the effect of flow control devices on flow field characteristics is not obvious i. e. it is not needed to locate flow control devices ； with casting speed ≥0. 4 m/min and < 0. 7 m/min, it is available to using tundish located weirs; and with casting speed ≥0. 7 m/min, the structure of weirs with turbulent inhibitor is favourable to be used to optimize the characteristics of flow field in tundish. It is obtained by analysis on flow field in tundish that to locate flow control devices the disorder degree of pouring flow should be decreased as far as possible and the turbulent energy of liquid flow is depleted as much as possible in pouring region.