1981 Volume 67 Issue 8 Pages 1210-1219
The thickness of the molten powder pool on the molten steel in a mold and its formation process have been investigated from a viewpoint of the prevention of the longitudinal surface cracks in continuously cast steel slabs.
The results obtained are summarized as follows:
(1) It is important to control the thickness of the molten powder pool in the optimum range in order to prevent the longitudinal surface cracks in continuously cast slabs.
(2) The necessary minimum pool thickness is decided by the oscillation conditions of the mold and the surface rippling characteristics of the molten steel in the mold, which correspond to casting conditions.
(3) There is a characteristic incubation period of the mold powder before the heat flux starts to increase from the surface of powder layer which is formed on the molten steel. This incubation period can be used to evaluate the ability of the mold powder to form the pool.