METHOD FOR PREPAREDLY CHARGING RAW MATERIAL AT ALLOY PRODUCTION

PROBLEM TO BE SOLVED: To provide a method for preparedly charging raw materials at alloy production in which even in the case that the unit weights of respective raw materials vary, the raw material for adjusting the precision is unnecessary to separately prepare. SOLUTION: In the method for preparedly charging the raw materials in the case of producing the alloy having a prescribed composition ratio from plural raw materials having the variation of respective weights, a reference weight dividing a target production quantity f the alloy into plural number, is set and the reference weight is targeted as the center. Further, the target raw material ratio of the above alloy is targeted as the center and plural mixture divided raw materials, in which the composition ratios of each raw material are different and also, the respective compositions and ratios are clear, are prepared. The suitable mixture divided raw material is selected among plural mixture divided raw materials so as to be within the permissible dispersion of the producing alloy weight and be within the permissible dispersion even in the composition of the alloy, and charged into a melting furnace.