摘要
通过对"转炉冶炼→出钢无铝脱氧、增碳→LF精炼→RH真空脱气→大方坯连铸→轧制"工艺流程生产重轨钢各工艺环节系统取样,采用元素化学分析,扫描电镜-能谱分析和小样电解等方法,研究了炼钢流程中的夹杂物化学成分、形貌和尺寸的变化。结果表明:主要夹杂物是CaO-MgO-Al2O3-SiO2复合夹杂物,经过LF的加热、RH的真空处理,钢渣充分接触和夹杂物的改性,部分夹杂物的化学成分落在1 500℃以内的低熔点液相区;夹杂物尺寸从转炉30μm到RH真空处理后的5μm,再到中间包8.5μm有先减小后增加的趋势,经过RH真空处理后,大尺寸夹杂去除效果较好,大部分在1μm^10μm之间,没有发现超大型夹杂(>100μm),说明RH去除大型夹杂效果明显。
Chemical element analysis,SEM-EDS analysis and small sample electrolysis were adopted to study the changes of chemical composition,morphology and size of inclusions sampling from the whole production process of heavy rail steel-＂BOF steelmaking → Al-free deoxidation and adding-carbon→ LF refining→ RH vacuum degassing→ bloom casting→rolling＂.The results show that CaO-MgO-Al2O3-SiO2 composite inclusions are principal,and after the LF heating,RH vacuum treatment,fully contacting with slags and modification of inclusions,the chemical composition from part inclusions is located in low melting liquid phase area within1500℃,the size of inclusions from 30μm in BOF,5μm after RH,to 8.5μm in tundish is inclined to increase at first and then decrease.The large inclusions are eliminated efficiently by RH vacuum treatment,leaving the size of inclusions 1μm ~10μm and without large inclusions（100μm）,which illustrates the measurable performance of RH to the Removal of inclusions.
出处
《四川冶金》
CAS
2015年第3期1-7,共7页
Sichuan Metallurgy
关键词
夹杂物
化学成分
演变规律
尺寸
inclusions
chemical composition
evolution law
size
