METHOD FOR MANUFACTURING Fe-Ni BASED PERMALLOY SUPERIOR IN MAGNETIC CHARACTERISTICS

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a Fe-Ni based permalloy superior in magnetic characteristics by making component segregation as well as inclusion in a final product as little as possible. SOLUTION: The method comprises; adding lime stone, fluorite, and alumina as flux to a molten steel which has been obtained by melting a raw material of the Fe-Ni based permalloy including 30-85 wt.% Ni, in a process of deoxidation and desulfurization of the molten steel; forming a CaO-SiO2-Al2O3-MgO-F based molten slag on the molten steel; deoxidizing and desulfurizing with Al; and controlling a total concentration of oxygen and sulfur in the molten steel as to be 150 ppm or less.