单嘴浸渍管RH和弓形浸渍管RH的应用效果

敬业钢铁有限公司现场试验了单嘴浸渍管结构RH炉和弓形浸渍管结构RH炉真空精炼超低碳钢的应用效果,记录两种RH炉提升气体流量和真空度的变化,多次取样检测钢液中w(C])和w(Mn]),分析对比两种RH炉的脱碳效果和混匀时间。结果显示,在真空处理6 min内,两种RH炉的真空度都可降至100 Pa以下,10 min后稳定在50 Pa左右;在真空处理20 min内,前者钢中w(C])基本脱至0.001 0%~0.001 5%,而后者钢中w(C])可以脱至0.000 5%左右,后者的脱碳速率也明显快于前者;前者和后者的混匀时间分别在3和1 min左右。结果表明,后者的冶炼效果明显优于前者,弓形浸渍管比单嘴浸渍管更适用于小吨位RH真空精炼炉。

Application effects of single snorkel RH and arched snorkel RH

The application effect of vacuum refining of ultra-low carbon steel in single snorkel structure RH furnace and arched snorkel structure RH furnace was tested in the field of Jingye Iron and Steel Co., Ltd., the changes of gas flow rate and vacuum degree of two kinds of RH furnaces were recorded. And the mass percentage of w (C]) and w (Mn]) in molten steel was detected by multiple sampling, the decarburization effect and mixing time of two kinds of RH furnaces were analyzed and compared. The results were that the vacuum degree of both kinds of RH furnaces could be reduced to less than 100 Pa within 6 min of vacuum treatment, and stabilized at about 50 Pa after 10 min. Within 20 min of vacuum treatment, w (C]) in steel refined by the former RH furnace could be basically removed to 0.001 0%-0.001 5%, while w (C]) in steel refined by the latter RH furnace could be removed to about 0.000 5%. And the decarburization rate of the latter was significantly faster than that of the former. The mixing time of the former RH furnace and the latter RH furnace was about 3 and 1 min, respectively. The results showed that the smelting effects of the latter RH furnace were obviously better than that of the former RH furnace, and the arched snorkel was more suitable for the small tonnage RH vacuum refining furnace than single snorkel.