Abstract: A water model with linear scale 1 ; 3. 27 for a 70 t ladle RH unit has been established by using flow rale methed to measure RH circulation rate. RH circulation rate of liquid steel in real process condition and effect of parameters such as blow rate in up-gas tube, inner diameter of orifice T blowing up-gas traveling path and dipping depth of leg on RH circulation rate were analyzed to get optimizing process parameters. The commercial test of a 70 t ladle RH degassing refining showed that with blow rate 1 200 L/min in up-gas tube and inner diameter 3 mm of orifice, average [0] of bearing steel decreased by 3 X 10^-6 as compared that with original process ； carbon content of extra-low carbon steel might decrease to less than 0. 002% and decarburization time obviously decreased as compared with that before optimization.

摘要： 以70 t钢包RH精炼装置为原型建立了1:3.27水模型,用流速法测量RH循环流量。分析了实际工艺条件下钢水的RH循环流量以及上升管吹气量、吹气孔内径、吹气孔高度、浸渍管插入深度等参数对RH循环流量的影响,并得出优化工艺参数。70 t钢包RH精炼实验结果表明,当上升管吹气量1 200 L/min,吹气孔内径3 mm时,轴承钢平均[O]比原工艺降低3×10^-6;超低碳钢碳含量可降低到0.002%以下,脱碳时间比优化前明显减少。

关键词: RH精炼, 水模型, 循环流量, 工艺优化