1前言钢中存在着非金属夹杂物，这些夹杂物破坏钢的连续性和致密性。由于人们对钢材质量的要求日益提高，因而对夹杂物的研究日益加深。近期研究表明，只有那些尺寸大于“临界值”的夹杂物才起重要影响。因此，钢中非金属夹杂物对钢材及钢制品质量的影响，主要决定于钢中夹杂物 1 Preface Non-metallic inclusions exist in the steel and these inclusions impair the continuity and compactness of the steel. Due to the increasing demand for steel quality, the research on inclusion has been deepening. Recent studies show that only inclusions larger than “critical” have an important effect. Therefore, the impact of non-metallic inclusions on the quality of steel and steel products, mainly determined by the inclusions in the steel