Non-oriented electrical steel sheet, method for producing same, and hot-rolled steel sheet
AssigneeNippon Steel Corporation
InventorsYoshihiro Arita, Shinichi Matsui
Life of this patent
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Abstract
A non-oriented electrical steel sheet is provided which has a chemical composition that contains, in mass %, C: 0.0050% or less, Si: 0.10 to 1.50%, Mn: 0.10 to 1.50%, sol. Al: 0.0050% or less, N: 0.0030% or less, S: 0.0040% or less, and O: 0.0050 to 0.0200%, and contains one or more elements selected from a group of La, Ce, Zr, Mg and Ca in a total amount of 0.0005 to 0.0200%, with the balance being Fe and impurities. A number density N of suitable oxide particles is 3.0×103 to 10×103 particles/cm2, and a number density n of oxide particles containing La and the like satisfies the expression n/N≥0.01.
Claims6
A non-oriented electrical steel sheet having a chemical composition comprising, in mass %,
- C:
- 0.0050% or less,
- Si:
- 0.10 to 1.50%,
- Mn:
- 0.10 to 1.50%,
- sol. Al:
- 0.0050% or less,
- N:
- 0.0030% or less,
- S:
- 0.0040% or less,
- O:
- 0.0050 to 0.0200%,
- Sn:
- 0.50% or less, and
- one or more of La, Ce, Zr, Mg and Ca:
- 0.0005 to 0.0200% in total,
- with the balance comprising Fe and impurities,
- wherein:
- a number density N of oxide particles containing, in mass %, O:
- 20 to 60% and Si:
- 20 to 60%, and having a diameter of 1.0 to 5.0 μm is 3.0×103 to 10×103 particles/cm2, and
- a number density n of oxide particles containing, in mass %, O:
- 20 to 60% and Si:
- 20 to 60%, and having a diameter of 1.0 to 5.0 μm and further containing one or more of La, Ce, Zr, Mg and Ca in a total amount of 1.0% by mass or more satisfies Formula (i) below:
- n
- /
- N
- ≥
- 0.01
- .
- (
- i
- )
Dependencies are inferred from the claim text.