| 摘要 |
A Ni-Fe magnetic alloy consists essentially of: 77 to 80 wt. % Ni, 3.5 to 5 wt. % Mo, 1.5 to 3 wt. % Cu, 0.1 to 1.1 wt. % Mn, 0.1 wt. % or less Cr, 0.003 wt. % or less S, 0.01 wt. % or less P, 0.005 wt. % or less O, 0.003 wt. % or less N, 0.02 wt. % or less C, 0.001 to 0.05 wt. % Al, 1 wt. % or less Si, 2.6-6 of the weight ratio of Ca to S, (Ca/S), and the balance being Fe and inevitable impurities, satisfies an equation of 3.2</=(2.02x[Ni]-11.13x[Mo]-1.25x[Cu]-5.03x[Mn])/(2.13x[Fe])</=3.8; and has a Mo segregation ratio defined by a seregration equation satisfying 5% or less, the seregration equation being |(Mo content in a segregation region-Mo average content)/(Mo average content)|x100%. A method for producing a magnetic Ni-Fe alloy comprises the steps of: a first heating step of heating an alloy ingot to 1200 DEG to 1300 DEG C. for 10 to 30 hrs; slabbing the heated ingot at a finishing temperature of 950 DEG C. or more to produce a slab; a second heating step of heating the slab at 1150 DEG to 1270 DEG C. for 1 to 5 hrs; and hot rolling the heated slab at a finishing temperature 950 DEG C. or more.
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