METHOD FOR PREVENTING FORMATION OF SOLIDIFIED SHELL ON SHORT-SIDE SURFACE IN CHARGING PORT PART IN CONTINUOUS CASTING OF THIN-WALLED BILLET

摘要

PURPOSE:To prevent surely generation of solidified shells on short side surfaces in a funnel- shaped charging port in the initial period of casting by heating the refractory surfaces themselves on the short-side surfaces by the combustion heat of gas and increasing the temp. on the refractory surfaces on the short sides while shielding the radiation of heat to metallic belts on long-side surfaces by the combustion gas of a high temp. CONSTITUTION:Short side refractories 15, 15' covering respectively the side plates 2, 2' on the short-side surfaces in a charing port part 9 on the side where said plates are in contact with a molten metal are heated by the following method: Combustion gas is blown onto the surface of the refractories 15 from a burner 16 provided in the position above the part 9 so as to extend along, for example, the refractories 15. Gaseous CO which has no possibility at all of generating water drops is advantangeously used as said combustion gas. An iron plate 17 for shielding heat radiation is provided near the surface of the refractories 15 so as to face the surface of the refractories in order to prevent the radiation of heat from the refractories 15, by which heating efficiency is improved. If the surfaces of the refractories 15, 15' are heated up to =800 deg.C in this case, the formation of the solidified shells on their surfaces is not admitted. In the figure, 3 denotes a casting space, 6 the molten metal, 8 a charging nozzle, and 1, 1' denote the metallic belts on the long-side surfaces, respectively.