钢包底吹对RH脱氢和夹杂物的影响

 RH(Ruhrstahl Heraeus)真空精炼过程钢包底吹作为提高精炼效果的一种方式近年来受到广泛关注,为研究钢包底吹在实际生产中的影响,通过工业生产试验研究了RH真空精炼过程钢包底吹对脱氢和夹杂物的影响。结果表明,增加钢包底吹优化了钢包内部钢液的流动和混匀情况,增大了夹杂物的碰撞聚集长大速率和夹杂物的平均尺寸,提高了脱氢效果,增大了脱氢速率,尤其是较高氢质量分数下的脱氢速率。底吹流量为30和50 L/min时,将氢脱除到0.000 2%所需真空处理时间减少5.58%和16.40%,此时脱氢速率增加9.76%和19.51%。另外夹杂物数密度增幅从64.2%逐次降低到49.7%和13.0%,夹杂物平均面积增幅从17.34%逐次增加到40.98%和53.37%。

Effect of ladle bottom blowing on RH dehydrogenation and inclusions

The ladle bottom blowing in the RH(Ruhrstahl Heraeus)vacuum refining process has received extensive attention in recent years as a way to improve the refining effect.In order to study the influence of ladle bottom blowing on actual production.The effect of ladle bottom blowing on dehydrogenation and inclusions in the RH vacuum refining process was studied through industrial production experiments.The results show that increasing the bottom blowing of the ladle optimizes the flow and mixing of the molten steel inside the ladle,increases the collisional growth rate of inclusions and the average size of the inclusions,improves the dehydrogenation effect,and increases the dehydrogenation rate,especially the dehydrogenation rate at higher hydrogen mass percent.When the bottom blowing flow is 30 and 50 L/min,the vacuum time required to remove hydrogen to 0.000 2%is reduced by 5.58% and 16.40%,and the dehydrogenation rate is increased by 9.76% and 19.51% at this time.In addition,the increase in the number density of inclusions decreased from 64.2% to 49.7%and 13.0%,and the increase in the average area of inclusions increased from 17.34%to 40.98% and 53.37%.