Laboratory experiments were performed to study the transient evolution of inclusions in Si–Mn-killed stainless steels with additions of 60 and 360 ppm yttrium using low- and high-oxygen yttrium-containing ferroalloys. With the increase of the yttrium content in the steel, the evolution path of inclusions was CaO–Al₂O₃–SiO₂–MnO → Y₂O₃–Al₂O₃–SiO₂(–CaO–MnO) → Y₂O₃ and YS → Y₂O₃. The YS inclusion was generated as a transient product in the steel with 360 ppm yttrium addition using high-oxygen yttrium-containing ferroalloys. With the addition of 60 ppm yttrium, initial larger CaO–Al₂O₃–SiO₂–MnO inclusions were modified to smaller liquid Y₂O₃–Al₂O₃–SiO₂(–CaO–MnO) inclusions, resulting in a smaller diameter of inclusions. After the addition of 360 ppm yttrium, initial liquid CaO–Al₂O₃–SiO₂–MnO inclusions were modified to small solid Y₂O₃-rich inclusions, lowering the average diameter of inclusions. Then, the size of inclusions in the steel increased due to the collision of solid inclusions.

使用低氧和高氧含钇铁合金，进行了实验室实验，以研究添加 60 和 360 ppm 钇的 Si-Mn 镇静不锈钢中夹杂物的瞬态演变。随着钢中钇含量的增加，夹杂物的演化路径为CaO–Al ₂ O ₃ –SiO ₂ –MnO → Y ₂ O ₃ –Al ₂ O ₃ –SiO ₂ (–CaO–MnO) → Y ₂ O ₃和 YS → Y ₂ O ₃. YS 夹杂物是钢中的一种瞬态产物，使用高氧含钇铁合金添加 360 ppm 钇。添加 60 ppm 钇后，初始较大的 CaO–Al ₂ O ₃ –SiO ₂ –MnO 夹杂物被改性为较小的液态 Y ₂ O ₃ –Al ₂ O ₃ –SiO ₂ (–CaO–MnO) 夹杂物，从而形成夹杂物直径较小。添加 360 ppm 钇后，初始液态 CaO-Al ₂ O ₃ -SiO ₂ -MnO 夹杂物被改性为小固体 Y ₂ O ₃- 丰富的夹杂物，降低了夹杂物的平​​均直径。然后，由于固体夹杂物的碰撞，钢中夹杂物的尺寸增加。