Method for producing Fe-Ni-based permalloy alloy having excellent magnetic properties

摘要

PPROBLEM TO BE SOLVED: To provide a new method for manufacturing Fe-Ni system permalloy alloy excellent in magnetic characteristic by reducing inclusions and composition-segregation in a final product as much as possible. PSOLUTION: In deoxidizing and desulfurizing processes of molten steel obtained by melting the raw material for Fe-Ni-based permalloy alloy containing 35 to 40 mass% Ni, this new manufacturing method comprises: adding limestone, fluoride and alumina as flux to the molten steel in an alumina- or magnesia-based refractory vessel; performing deoxidation and desulfurization to the molten steel by using Al to suppress the total concentration of oxygen and sulfur in the molten steel to be 150 ppm; and generating AlSB2/SBOSB3/SB, MgO-AlSB2/SBOSB3/SB, MgO system high fusing point oxide-based inclusion composition. PCOPYRIGHT: (C)2010,JPO&INPIT