Abstract
The author studied on the relation between the positions of the blow-holes and the thicknesses of the ingot-moulds for the incompletely "Killed" steel ingots. And consequently it was deduced that a slightly good influence recognized by increasing the thickness of the ingot-mould. From this experiment, the author also explained the mechanism of the occurrence of the blow-holes, and that the important point of smelting of this steel is "the moderate deoxidation degree and the supercooling of the molten steel on the solidification"
