Steel Material for Soft Magnetic Part, Soft Magnetic Part, and Method for Producing Soft Magnetic Part
First Claim
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1. A steel material for a soft magnetic part having 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%,N;
0.003 to 0.030%,Cr;
0 to less than 0.80%,Ti;
0 to 0.20%,Nb;
0 to 0.20%,B;
0 to 0.005%, andCa;
0 to 0.005%, with the balance being Fe and impurities, whereinan average grain diameter of ferrite grains in the steel material for a soft magnetic part ranges from 5 to 200 μ
m, andin the ferrite grains, the number Sv (number/mm2) of precipitates having a circle-equivalent diameter of 30 nm or more satisfies Formula (1);
Sv≤
10V×
7.0×
106
(1)where a V content (mass %) in the steel material for a soft magnetic part is substituted into V in Formula (1).
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Abstract
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 pun. 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):
Sv≤10V×7.0×106 (1)
- 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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23 Claims
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1. A steel material for a soft magnetic part having 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%,N;
0.003 to 0.030%,Cr;
0 to less than 0.80%,Ti;
0 to 0.20%,Nb;
0 to 0.20%,B;
0 to 0.005%, andCa;
0 to 0.005%, with the balance being Fe and impurities, whereinan average grain diameter of ferrite grains in the steel material for a soft magnetic part ranges from 5 to 200 μ
m, andin the ferrite grains, the number Sv (number/mm2) of precipitates having a circle-equivalent diameter of 30 nm or more satisfies Formula (1);
Sv≤
10V×
7.0×
106
(1)where a V content (mass %) in the steel material for a soft magnetic part is substituted into V in Formula (1). - View Dependent Claims (2, 3, 10, 11, 12, 13, 14, 23)
- 0.02 to 0.13%,
-
4-9. -9. (canceled)
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15. A soft magnetic part having 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%,N;
0.003 to 0.030%,Cr;
0 to less than 0.80%,Ti;
0 to 0.20%,Nb;
0 to 0.20%,B;
0 to 0.005%, andCa;
0 to 0.005%, with the balance being Fe and impurities, whereinin ferrite grains in the soft magnetic part, the number Sv (number/mm2) of precipitates having a circle-equivalent diameter of 30 nm or more satisfies Formula (1), and maximum magnetic permeability is 0.0015 N/A2 or more;
Sv≤
10V×
7.0×
106
(1)where a V content (mass %) in the soft magnetic part is substituted into V in Formula (1). - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
- 0.02 to 0.13%,
Specification
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Current AssigneeNippon Steel Corporation
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Original AssigneeNippon Steel Corporation
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InventorsEgashira, Makoto, Sueno, Hidekazu, Matsumoto, Hitoshi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current
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CPC Class CodesC21D 1/04 with simultaneous applicati...C21D 6/00 Heat treatment of ferrous a...C21D 8/12 during manufacturing of art...C22C 2202/02 MagneticC22C 38/00 Ferrous alloys, e.g. steel ...C22C 38/001 containing NC22C 38/02 containing siliconC22C 38/04 containing manganeseC22C 38/06 containing aluminiumC22C 38/24 with vanadiumC22C 38/26 with niobium or tantalumC22C 38/28 with titanium or zirconiumC22C 38/32 with boronC22C 38/60 containing lead, selenium, ...H01F 1/147 Alloys characterised by the...
