Retrofits in process to prepare ingots of steel of higher quality and material 's heat retainer molded in the form of a surfboard

摘要

A process of manufacturing killed steel ingots of superior quality by forming the sound hot top portion and reducing the concentration of nonmetallic inclusion in the mushy zone of ingot bottom, characterized by arranging on the molten steel surface immediately after the pouring of the molten steel into a mold, a board-like molded heat-retaining material in which lining of a layer consisting of easily-flammable material is made to an exothermic, diabatic layer consisting of crushed flat charcoal, a refractory material expansible by heating and a binder.