Abstract：For the evaluation of fine inclusion in steel efficiently, an evaluation method from the aspects of particle diameter, distribution, composition and morphology has been established on the basis of dispersedly distributed fine inclusions introduced by oxide metallurgical technology. The fine inclusions were test by employing scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with energy dispersive spectrometer. it was concluded that the inclusions in steel smelted by oxide metallurgical technology were particles with MgO or CaO as core surrounded by MnS. The oxide particle with Mg was cuboid with smooth surface and angular edge. Its size was about 1 μm×0.8 μm×0.3 μm. In addition, it was be found that the inclusions number in steel by oxide metallurgical technology was obviously higher than that by general metallurgical technology. Based on this study, This method could be applied for systematic and comprehensive assessment of fine inclusion in steels.
