摘要
在精炼进站时采用BaCO3作为示踪剂,对比钢包底吹氩气流量对"120 t BOF→LF→CCM"流程生产的冷镦钢SWRCH35K中DS类夹杂物的影响.结果表明,氩气流量对精炼结束炉渣成分及夹杂物的类型无明显影响;精炼进站到精炼结束采用小氩气和正常氩气搅拌夹杂物密度分别降低4.5个/mm2和7.1个/mm2,精炼结束到中包两种工艺夹杂物变化相差不大,精炼正常氩气搅拌精炼结束、软吹后、中包含Ba的夹杂物比例比小氩气搅拌分别高51.5％、26.1％、39.3％.铸坯中DS夹杂物组成有单相、两相和三相.精炼采用小氩气搅拌和正常氩气搅拌铸坯中检测到含Ba的DS夹杂物占所有DS夹杂物的比例分别为28.6％和39％.所以,控制精炼过程中冶炼的氩气搅拌强度也是控制钢中DS夹杂物的关键.
Abstract
The effect of argon flow rate blowing from ladle bottom on DS inclusions in cold heading steel SWRCH35K produced by 120 t BOF→LFCCM process was compared by using BaCO3as a tracer during refining.The results showed that the argon flow rate had no significant effect on the composition of the slag and the type of inclusions after refining.The density of inclusions decreased by 4.5 mm-2 and 7.1 mm-2,respectively,using small argon gas and normal argon gas stirring from the refining station to the refining end.There was no significant difference in the changes in inclusions between the two processes from the refining end to the tundish.When using normal argon gas stirring,the percentage of inclusions containing Ba after refining,after soft blowing,and tundish is 51.5％,26.1％,and 39.3％higher than that with small argon stirring,respectively.DS inclusions in the billet consists of single phase,two phase and three phase.The proportion of DS inclusions containing Ba detected in the billet using small argon stirring and normal argon stirring during refining process was 28.6％and 39％,respectively,of all DS inclusions.Therefore,controlling the intensity of argon stirring during the refining process is also the key to controlling DS inclusions in steel.
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维普
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