Non-oriented electrical steel sheet and method for manufacturing thereof
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsSatoshi KANO, Takeaki WAKISAKA, Ichiro TANAKA
Life of this patent
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Abstract
A non-oriented electrical steel sheet includes C: 0 to 0.0050 mass %, Si: 0.50 to 2.70 mass %, Mn: 0.10 to 3.00 mass %, Al: 1.00 to 2.70 mass %, and P: 0.050 to 0.100 mass %. In the non-oriented electrical steel sheet, Al/(Si+Al+0.5×Mn) is 0.50 to 0.83, Si+Al/2+Mn/4+5×P is 1.28 to 3.90, Si+Al+0.5×Mn is 4.0 to 7.0, the ratio of the intensity of {100} plane I{100} to the intensity of {111} plane I{111} is 0.50 to 1.40, the specific resistance is 60.0×10−8 Ω·m or higher at room temperature, and the thickness is 0.05 mm to 0.40 mm.
Claims3
A non-oriented electrical steel sheet having a chemical composition comprising:
- C:
- 0 to 0.0050 mass %,
- Si:
- 0.50 to 2.70 mass %,
- Mn:
- 0.10 to 3.00 mass %,
- Al:
- 1.00 to 2.70 mass %,
- P:
- 0.050 to 0.100 mass %,
- S:
- 0 to 0.0060 mass %,
- N:
- 0 to 0.0050 mass %,
- Ti:
- 0 to 0.008 mass %,
- V:
- 0 to 0.008 mass %,
- Nb:
- 0 to 0.008 mass %,
- Zr:
- 0 to 0.008 mass %, and
- a balance:
- Fe and impurities, wherein
- the chemical composition satisfies a following expression (1), a following expression (2), and a following expression (3),
- an intensity of a {100} plane I{100} and an intensity of a {111} plane I{111} satisfy a following expression (4), the intensity I{100} and the intensity I{111} being determined by calculating an average of an orientation determination function near a surface and an orientation determination function at a thickness center using pole figures measured by an X-ray diffraction method,
- a specific resistance is 60.0×10−8 Ω·m or higher at room temperature,
- a thickness is 0.05 mm to 0.40 mm,
- 0.50≦Al/(Si+Al+0.5×Mn)≦0.83 (1),
- 1.28≦Si+Al/2+Mn/4+5×P≦3.90 (2),
- 4.0≦Si+Al+0.5×Mn≦7.0 (3), and
- 0.50≦I{100}/I{111}≦1.40 (4).
A method for manufacturing a non-oriented electrical steel sheet, the method comprising:
- a hot rolling step subjecting a slab to hot rolling to manufacture a hot band, the slab having a chemical composition comprising:
- C:
- 0 to 0.0050 mass %,
- Si:
- 0.50 to 2.70 mass %,
- Mn:
- 0.10 to 3.00 mass %,
- Al:
- 1.00 to 2.70 mass %,
- P:
- 0.050 to 0.100 mass %,
- S:
- 0 to 0.0060 mass %,
- N:
- 0 to 0.0050 mass %,
- Ti:
- 0 to 0.008 mass %,
- V:
- 0 to 0.008 mass %,
- Nb:
- 0 to 0.008 mass %,
- Zr:
- 0 to 0.008 mass %, and
- a balance:
- Fe and impurities, and
- the chemical composition satisfying a following expression (5), a following expression (6), and a following expression (7),
- a cold rolling step subjecting the hot band to cold rolling after the hot rolling step to manufacturing a cold band having a thickness of 0.05 mm to 0.40 mm,
- a final annealing step subjecting the cold band to final annealing after the cold rolling step, wherein
- in the cold rolling step, an average grain size of the hot band before the cold rolling D (μm) and a solid solution strengthening parameter R calculated by a following expression (8) satisfy a following expression (9),
- in a stage in which the cold band is heated in the final annealing step, a temperature of the cold band is maintained for 10 to 300 s at a constant temperature in a range of 550° C. to 700° C.,
- 0.50≦Al/(Si+Al+0.5×Mn)≦0.83 (5),
- 1.28≦Si+Al/2+Mn/4+5×P≦3.90 (6),
- 4.0≦Si+Al+0.5×Mn≦7.0 (7),
- R═Si+Al/2+Mn/4+5×P (8), and
- [
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Dependencies are inferred from the claim text.