Electrical steel sheet and method for manufacturing same
AssigneeNippon Steel Corporation
InventorsMiho TOMITA, Yoshiaki NATORI, Hiroyoshi YASHIKI, Hiroshi FUJIMURA
Life of this patent
Estimating the term…
Abstract
This electrical steel sheet contains, as a chemical composition, by mass %, C: 0.0035% or less, Si: 2.00% to 3.50%, Mn: 2.00% to 5.00%, P: 0.050% or less, S: 0.0070% or less, Al: 0.15% or less, N: 0.0030% or less, Ni: 0% to 1.00%, Cu: 0% to 0.10%, and a remainder: Fe and impurities, in which an X-ray random intensity ratio in a {100} <011> crystal orientation on a sheet surface is 15.0 to 50.0, and magnetic flux densities in 0°, 22.5°, and 45° directions from a rolling direction each satisfy [1.005×(B50 (0°)+B50 (45°))/2≥B50 (22.5°)].
Claims4
An electrical steel sheet comprising, as a chemical composition, by mass %:
- C:
- 0.0035% or less,
- Si:
- 2.00% to 3.50%,
- Mn:
- 2.00% to 5.00%,
- P:
- 0.050% or less,
- S:
- 0.0070% or less,
- Al:
- 0.15% or less,
- N:
- 0.0030% or less,
- Ni:
- 0% to 1.00%,
- Cu:
- 0% to 0.10%, and
- a remainder:
- Fe and impurities,
- an X-ray random intensity ratio in a {100} <011> crystal orientation on a sheet surface is 15.0 to 50.0, and
- magnetic flux densities in 0°, 22.5°, and 45° directions from a rolling direction each satisfy Expression (i),
- 1.005×(B50 (0°)+B50 (45°))/2≤B50 (22.5°) (i)
- here, the meaning of each symbol in Expression (i) is as follows:
- B50 (0°):
- a magnetic flux density (T) in the 0° direction from the rolling direction,
- B50 (22.5°):
- a magnetic flux density (T) in the 22.5° direction from the rolling direction, and
- B50 (45°):
- a magnetic flux density (T) in the 45° direction from the rolling direction.
A method for manufacturing an electrical steel sheet, the method comprising in the following order:
- on a slab having a chemical composition of, by mass %:
- C:
- 0.0035% or less,
- Si:
- 2.00% to 3.50%,
- Mn:
- 2.00% to 5.00%,
- P:
- 0.050% or less,
- S:
- 0.0070% or less,
- Al:
- 0.15% or less,
- N:
- 0.0030% or less,
- Ni:
- 0% to 1.00%,
- Cu:
- 0% to 0.10%, and
- a remainder:
- Fe and impurities,
- (a) heating the slab to 1000° C. to 1200° C., then, performing hot rolling under a condition where a final rolling temperature is within a temperature range of an Ac3 transformation point or higher, and cooling the slab to a temperature of 600° C. or lower after completion of the hot rolling to 600° C. such that an average cooling rate reaches 50 to 150° C./s,
- (b) performing first cold rolling at a rolling reduction of 80% to 92% without performing an annealing treatment,
- (c) performing an intermediate annealing treatment at an intermediate annealing temperature within a range of 500° C. or higher and lower than an Ac1 transformation point,
- (d) performing second cold rolling at a rolling reduction of more than 15.0% and 20.0% or less, and
- (e) performing a final annealing treatment at a final annealing temperature within a range of 500° C. or higher and lower than the Ac1 transformation point.
Dependencies are inferred from the claim text.