PURPOSE: To obtain an ingot having an excellent surface characteristic by granulating a flux consisting of a specific compsn. and coating the surface thereof with pulverous carbon powder thereby forming the granular flux for continuous casting.
CONSTITUTION: This flux is composed of 2W20wt% Al2O3, 2W30wt% oxide of alkaline and alkaline earth metals exclusive of CaO, 3W30wt% fluoride of alkaline and alkaline earth metals and ≤7wt% carbon. The flux has the compsn. consisting of CaO and SiO2 in a 0.65W1.50 range of the value of weight ratio between CaO and SiO2 as the residual components except inevitable impurities. The raw material mixture preped. by compounding the powder of the remaining carbon excluding 0.2W3wt% of the above-mentioned carbon content together with the remaining compsn. components and water are mixed and the mixture is granulated. The surface coating consisting of the pulverous carbon powder having ≤3μm grain size of the amt. corresponding to the amt. excluded from the above-mentioned powder formulation is formed on the outside peripheral surfaces of the granules.
SAKURATANI TOSHIKAZU
NOZAKI TSUTOMU
