Effect of the morphologies of non-metallic inclusions on their removal behavior

The differences in shape correction coefficient(SCC) of common inclusions in molten steel including spherical,cubic,cylindrical,dendritic and cluster particles were studied by a physical simulation method. The effects of inclusion surface morphologies and movement orientation on the SCC were analyzed on the basis of simulation results. The SCC can be used to evaluate the inclusion removal ability because of a linear correlation relationship between the SCC and the resistance coefficient of inclusions. For inclusions with the same volume but different shapes,the removal ability increase in order as follows:dendritic particles with vertical floatation,spherical particles with coarse surfaces,cubic particles,cylindrical particles of 6 mm in radium,cylindrical particles of 4 mm in radium,dendritic particles with horizontal floatation,clusters,and spherical particles with smooth surfaces. When the surface area of spherical particles with coarse surfaces is approximately 2 times as large as that of spherical particles with smooth surfaces,the SCC of spherical particles with coarse surfaces increases by 2.1 times compared with the smooth ones. For simple particles,movement orientation has just limited effect on the SCC,but it influences the SCC of complex particles greatly. The SCC of dendritic particles with vertical floatation is about twice of that with horizontal floatation.