Abstract: Large inclusions and ultra-fine inclusions in 304 stainless steel thin strip produced by twin roll strip casting have studied by scanning and transmission electron microscope. Results indicated that inclusions in thin strip were spheroidal compound oxide inclusions with ingredient CaO-MnO-Al₂0₃-SiO₂and manganese sulphide inclusion; besides minor 50μm large inclusions, majority of inclusions in thin strip were less than 10 μm fine oxides and sulfides; in contrast to traditional concasting, size of inclusions in thin strip obviously decreased, of which number relatively increased; diameter of inclusions formed in solidification of liquid steel and finally accumulated in grain boundary was mainly less than 0.7 μm.

摘要： 采用扫描电镜(SEM)和透射电镜(TEM)对双辊薄带连铸304不锈钢中的大型夹杂物和微细夹杂物进行了研究。结果表明,薄带中的夹杂物一般呈球形,主要为CaO-MnO-Al₂O₃-SiO₂组成的复杂氧化物和硫化锰;薄带中除了有少量的50μm大型氧化物夹杂外,其余均为≤10μm细小的氧化物和硫化物夹杂;与传统连铸相比,双辊薄带连铸304不锈钢薄带中的细小氧化物夹杂尺寸明显减小,数量相对增多;在钢液凝固过程中形成最后聚集在晶界夹杂的直径大多小于0.7μm。