【摘要】 采用氧氮分析、金相分析、大样电解分析、扫描电镜及能谱分析等,研究LD—Ar站—CC生产的低碳钢头坯不同浇铸长度处的洁净度变化规律,并与正常坯洁净度水平进行对比分析。结果表明,头坯中T[O]和氮含量均随着浇铸长度的增加呈明显的下降趋势;头坯中显微夹杂物数量和大型夹杂物数量随着浇铸长度的增加大体都呈减少趋势;头坯中显微夹杂物主要来源于脱氧产物和二次氧化,大型夹杂物来源于二次氧化、结晶器卷渣、中间包卷渣和钢包引流砂;与正常坯洁净度相比较,头坯洁净度在浇铸长度大于3m以后与正常坯水平相一致。更多还原

【Abstract】 By means of oxygen and nitrogen analyzer,metallographic examination,SLIME,SEM,EDS,etc,the cleanliness of low carbon steel first slab produced by LD-Argon-blowing station-CC was studied and compared with that of normal slab.The results show that,with the increase in casting length,the T\ and \ contents in the first slab decrease obviously and micro-inclusions and large inclusions in the first slab exhibit a general tendency of decreasing,too.The micro-inclusions mainly come from deoxidization and reoxidation products,while large inclusions from reoxidation products,slag entrapment in mould or tundish,and stuffing sand.The cleanliness of low carbon steel first slab is close to that of normal slabs when the casting length exceeds 3.0 m.更多还原