NI-FE magnetic alloy and method for producing thereof

Details NI-FE magnetic alloy and method for producing thereof NI-FE magnetic alloy and method for producing thereof

1993-10-01

1996-03-19

Sheehan, John

Metal treatment

Stock

Magnetic

148429, 148120, 148121, 420458, 420459, 420460, H01F 104

Patent

active

055000576

ABSTRACT:
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 0, 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.ltoreq.(2.02.times.[Ni]-11.13.times.[Mo]-1.25.times.[Cu]-5.03.times.[M n])/ (2.13.times.[Fe]).ltoreq.3.8; and has a Mo segregation ratio defined by a seregration equation satisfying 5% or less, the seregration equation being .vertline.(Mo content in a segregation region-Mo average content)/ (Mo average content).vertline..times.100%.
A method for producing a magnetic Ni-Fe alloy comprises the steps of: a first heating step of heating an alloy ingot to 1200.degree. to 1300.degree. C. for 10 to 30 hrs; slabbing the heated ingot at a finishing temperature of 950.degree. C. or more to produce a slab; a second heating step of heating the slab at 1150.degree. to 1270.degree. C. for 1 to 5 hrs: and hot rolling the heated slab at a finishing temperature 950.degree. C. or more.

REFERENCES:
patent: 4441940 (1984-04-01), Pfeifer et al.
patent: 4935201 (1990-06-01), Inoue et al.
patent: 5135586 (1992-08-01), Meguro et al.
patent: 5211771 (1993-05-01), Okiyama et al.
JIS-C2531, 1987, pp. 1728-1741.

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