IF钢连铸坯夹杂物示踪试验研究

Study on Inclusion Tracer Test of IF Steel Continuous Casting Billets

通过工业示踪试验,采用大样电解试验方法,利用扫描电镜及能谱分析,分析了IF钢铸坯中大型夹杂物的类型、数量、尺寸及来源。结果表明,铸坯大型夹杂物平均含量为28.6 mg/10 kg,波动范围为23.8~41.4 mg/10 kg。粒度大于300μm的大型夹杂物占总量的26.7%。大型夹杂物几乎全部含有示踪熔渣元素,其中含K、Na元素的结晶器保护渣特征的夹杂物约占正常坯总量的60%,含La元素的钢包渣特征的夹杂物约占正常坯总量的30%。此外,还有小部分夹杂物来自脱氧产物聚集、中间包渣及耐火材料。

The type,quantity,size and source of inclusion defects in the IF steel slab were analyzed by the industrial tracer test,method of large samples electrolytic,scanning electron microscopy and energy spectrum analysis.The results show that the average content of large inclusions in the cast billets is 28.6 mg/10 kg,and the fluctuation range is from 23.8 mg/10 kg to 41.4 mg/10 kg.Large inclusions with a grain size of more than 300 μm accounted for 26.7% of the total.Large inclusions almost contain tracer slag elements.The inclusions with mold inclusions containing K and Na elements account for about 60% of the total billets,and the inclusions with steel slag containing La elements account for about 30%of the total slab.In addition,there are a few inclusions from the aggregation of deoxidized products,intermediate slag and refractory materials.