Steel material for soft magnetic part, soft magnetic part, and method for producing soft magnetic part

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United States of America Patent

PATENT NO 11248283
APP PUB NO 20190330722A1
SERIAL NO

16463172

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Abstract

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The steel material for a soft magnetic part according to the present invention has a chemical composition consisting of, in mass %, C: 0.02 to 0.13%, Si: 0.005 to 0.50%, Mn: 0.10 to 0.70%, P: 0.035% or less, S: 0.050% or less, Al: 0.005 to 1.300%, V: 0.02 to 0.50%, and N: 0.003 to 0.030%, with the balance being Fe and impurities. The average grain diameter of ferrite grains in the steel material for a soft magnetic part ranges from 5 to 200 μm. Further, in the ferrite grains, the number Sv (number/mm2) of precipitates having a circle-equivalent diameter of 30 nm or more satisfies Formula (1):

description='In-line Formulae' end='lead'Sv≤10V×7.0×106  (1)description='In-line Formulae' end='tail'

    where the V content (mass %) in the steel material for a soft magnetic part is substituted into V in Formula (1).

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 1008071 ?1008071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Egashira, Makoto Tokyo, JP 22 48
Matsumoto, Hitoshi Tokyo, JP 223 5955
Sueno, Hidekazu Tokyo, JP 4 5

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