CASTING METHOD OF THIN BILLET BY CONTINUOUS CASTING MACHINE FOR THIN BILLET

摘要

PURPOSE:To retard solidification in initial period of casting and to cast continuously a thin-walled billet in the stage of casting the thin billet by a continuous casting machine constituted of circulating bodies for long-side surfaces and stationary side plates for short-side surfaces by using means for inhibiting the extraction of heat from the stationary side plates. CONSTITUTION:A thin-walled billet is cast by a continuous casting machine in which a casting space 2' is constituted of circulating bodies 11, 12 for long-side surfaces disposed to face each other while maintaining a spacing for a specified length and a pair of stationary side plates 11, 12 for short-side surfaces having the convergent shape sandwiched by both bodies 5, 6 and positioned at the respective side edges. A material 16 which generates gas by thermal decomposition or combustion when brought into contact with a molten steel is stuck on the inside surfaces of the plates 11, 12 prior to charging of the molten steel into the space 2'. As a result, the high temp. gaseous film is formed between the molten steel cast into the space and the inside surfaces of the plates 11, 12 by the formed gas to generate the effect of shielding the heat, by which the formation and growth of the solidified shell in the initial period of casting are retarded and the thin-walled billet is cast.