鋳型内溶鋼中の酸化介在物の浮上分離におよぼす対流の影響

抄録

The effects of convection on the separation of floating oxide inclusions in liquid steel in mold were discussed theoretically, and the following results were obtained.
1. The pattern of convection, characterized by the cross section and the velocity of downward flow, has an extensive influence on the separation of inclusions. The effect of convection is remarkable for inclusion whose rising velocity is comparable with the velocity of the downward flow, and it is small for inclusions whose rising velocity is considerably higher or lower than the velocity of downward flow.
2. For such a convection with a small cross section of downward flow as that in killed steel in mold, large inclusions separate more rapidly than in tranquil bath in early period, but some large inclusions can not separate even after the time which is enough for separation in tranquil bath.
3. In such a convection having a large cross section of downward flow as that in rimming steel in mold, the separation of large inclusions is hindered remarkably.