Non oriented electrical steel sheet, iron core, manufacturing method of iron core, motor, and manufacturing method of motor

Patent metadata

Field	Value
Publication number	US-11749429-B2
Application number	US-202218077106-A
Country	US
Kind code	B2
Filing date	Dec 7, 2022
Priority date	Jul 30, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A non oriented electrical steel sheet includes, as a chemical composition, by mass %, 1.0% or more and 5.0% or less of Si, wherein a sheet thickness is 0.10 mm or more and 0.35 mm or less, an average grain size is 30 μm or more and 200 μm or less, an X1 value defined by X1=(2×B50L+B50C)/(3×IS) is less than 0.845, an E1 value defined by E1=EL/EC is 0.930 or more, and an iron loss W10/1k is 80 W/kg or less.

First claim

The invention claimed is:

1. A non oriented electrical steel sheet comprising a chemical composition containing, by mass %,
0.005% or less of C,
1.0% or more and 5.0% or less of Si,
less than 2.5% of sol. Al,
3.0% or less of Mn,
0.3% or less of P,
0.01% or less of S,
0.01% or less of N,
0.10% or less of B,
0.10% or less of O,
0.10% or less of Mg,
0.01% or less of Ca,
0.10% or less of Ti,
0.10% or less of V,
5.0% or less of Cr,
5.0% or less of Ni,
5.0% or less of Cu,
0.10% or less of Zr,
0.10% or less of Sn,
0.10% or less of Sb,
0.10% or less of Ce,
0.10% or less of Nd,
0.10% or less of Bi,
0.10% or less of W,
0.10% or less of Mo,
0.10% or less of Nb,
0.10% or less of Y, and
a balance consisting of Fe and impurities, wherein
a sheet thickness is 0.10 mm or more and 0.35 mm or less,
an average grain size is 30 μm or more and 200 μm or less,
an X1 value defined by a following expression 1 is less than 0.845,
an E1 value defined by a following expression 2 is 0.930 or more, and
an iron loss W 10/1k when excited so as to be a magnetic flux density of 1.0 T at a frequency of 1 kHz is 80 W/kg or less,
where the expression 1 is X1=(2×B 50L +B 50C )/(3×Is),
where the expression 2 is E1=E L /E C , and
where B 50L denotes a magnetic flux density in a rolling direction when magnetized with a magnetizing force of 5000 A/m, B 50C denotes a magnetic flux density in a transverse direction when magnetized with a magnetizing force of 5000 A/m, I S denotes a spontaneous magnetization at room temperature, E L denotes a young's modulus in the rolling direction, and E C denotes a young's modulus in the transverse direction.

2. The non oriented electrical steel sheet according to claim 1 , wherein an E2 value defined by a following expression 3 is 0.900 or more,
where the expression 3 is E2=(E L +E C )/2×E D , and
where E D denotes a young's modulus in a direction making an angle of 45° with the rolling direction.

3. An iron core comprising the non oriented electrical steel sheet according to claim 2 .

4. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 2 .

5. A manufacturing method of a motor comprising
a process of preparing an iron core by punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 2 and
a process of assembling the motor using the iron core.

6. The non oriented electrical steel sheet according to claim 1 , wherein an X2 value defined by a following expression 4 is 1.040 or less,
where the expression 4 is X2=(B 50L +B 50C )/2×B 5OD , and
where B 5OD denotes a magnetic flux density in a direction making an angle of 45° with the rolling direction when magnetized with a magnetizing force of 5000 A/m.

7. An iron core comprising the non oriented electrical steel sheet according to claim 6 .

8. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 6 .

9. A manufacturing method of a motor comprising
a process of preparing an iron core by punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 6 and
a process of assembling the motor using the iron core.

10. The non oriented electrical steel sheet according to claim 2 , wherein an X2 value defined by a following expression 4 is 1.040 or less,
where the expression 4 is X2=(B 50L +B 50C )/2×B 50D , and
where B 50D denotes a magnetic flux density in a direction making an angle of 45° with the rolling direction when magnetized with a magnetizing force of 5000 A/m.

11. An iron core comprising the non oriented electrical steel sheet according to claim 10 .

12. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 10 .

13. A manufacturing method of a motor comprising
a process of preparing an iron core by punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 10 and
a process of assembling the motor using the iron core.

14. The non oriented electrical steel sheet according to claim 1 , wherein the chemical composition contains, by mass %, more than 3.25% and 5.0% or less of Si.

15. An iron core comprising the non oriented electrical steel sheet according to claim 14 .

16. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 14 .

17. The non oriented electrical steel sheet according to claim 1 , wherein the chemical composition contains, by mass %, at least one of
0.0010% or more and 0.005% or less of C,
0.10% or more and less than 2.5% of sol. Al,
0.0010% or more and 3.0% or less of Mn,
0.0010% or more and 0.3% or less of P,
0.0001% or more and 0.01% or less of S,
0.0015% or more and 0.01% or less of N,
0.0001% or more and 0.10% or less of B,
0.0001% or more and 0.10% or less of O,
0.0001% or more and 0.10% or less of Mg,
0.0003% or more and 0.01% or less of Ca,
0.0001% or more and 0.10% or less of Ti,
0.0001% or more and 0.10% or less of V,
0.0010% or more and 5.0% or less of Cr,
0.0010% or more and 5.0% or less of Ni,
0.0010% or more and 5.0% or less of Cu,
0.0002% or more and 0.10% or less of Zr,
0.0010% or more and 0.10% or less of Sn,
0.0010% or more and 0.10% or less of Sb,
0.001% or more and 0.10% or less of Ce,
0.002% or more and 0.10% or less of Nd,
0.002% or more and 0.10% or less of Bi,
0.002% or more and 0.10% or less of W,
0.002% or more and 0.10% or less of Mo,
0.0001% or more and 0.10% or less of Nb, and
0.002% or more and 0.10% or less of Y.

18. An iron core comprising the non oriented electrical steel sheet according to claim 17 .

19. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 17 .

20. The non oriented electrical steel sheet according to claim 1 , wherein the chemical composition contains, by mass %, more than 4.0% in total of Si and sol. Al.

21. An iron core comprising the non oriented electrical steel sheet according to claim 20 .

22. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 20 .

23. The non oriented electrical steel sheet according to claim 1 , wherein the X1 value is 0.80 or more and less than 0.830.

24. An iron core comprising the non oriented electrical steel sheet according to claim 23 .

25. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 23 .

26. An iron core comprising the non oriented electrical steel sheet according to claim 1 .

27. A manufacturing method of an iron core comprising a process of punching and stress-relief-annealing the non oriented electrical steel sheet according to claim 1 .

28. A motor comprising the iron core according to claim 26 .

29. A manufacturing method of a motor comprising
a process of preparing an iron core by punching and stress-relief-ann

Assignees

• Nippon Steel Corp

Inventors

• Wakisaka Takeaki
• Tanaka Ichiro

Classifications

• C21D9/46

  for sheet metals · CPC title

• C21D8/1272

  Final recrystallisation annealing · CPC title

• C21D8/1266

  between cold rolling steps · CPC title

• C21D8/1261

  following hot rolling · CPC title

• C21D8/1233

  Cold rolling · CPC title