NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF PRODUCING SAME

• US 20190330710A1
• Filed: 01/12/2018
• Published: 10/31/2019
• Est. Priority Date: 01/17/2017
• Status: Active Grant

• Current Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Original Assignee: JFE Steel Corporation (JFE Holdings Incorporated)
• Inventors: ODA, Yoshihiko, OKUBO, Tomoyuki, ZAIZEN, Yoshiaki, UESAKA, Masanori
• Granted Patent: US 11,286,537 B2
• Time in Patent Office: Days
• CPC Class Codes: C21D 2201/05 Grain orientation
• CPC Class Codes: C21D 6/001 containing Ni C21D6/004 takes precedence
• CPC Class Codes: C21D 6/005 containing Mn
• CPC Class Codes: C21D 6/008 containing Si
• CPC Class Codes: C21D 8/005 of ferrous alloys C21D8/02 - C21D8/12 take precedence
• CPC Class Codes: C21D 8/12 during manufacturing of articles with special electromagnetic properties
• CPC Class Codes: C21D 8/1222 Hot rolling
• CPC Class Codes: C21D 9/46 for sheet metals
• CPC Class Codes: C22C 2202/02 Magnetic
• CPC Class Codes: C22C 38/00 Ferrous alloys, e.g. steel alloys cast-iron alloys C22C37/00
• CPC Class Codes: C22C 38/001 containing N
• CPC Class Codes: C22C 38/002 containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• CPC Class Codes: C22C 38/004 Very low carbon steels, i.e. having a carbon content of less than 0,01%
• CPC Class Codes: C22C 38/008 containing tin
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/06 containing aluminium
• CPC Class Codes: C22C 38/08 containing nickel C22C38/105 takes precedence
• CPC Class Codes: C22C 38/12 containing tungsten, tantalum, molybdenum, vanadium, or niobium
• CPC Class Codes: C22C 38/14 containing titanium or zirconium
• CPC Class Codes: C22C 38/60 : containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
• CPC Class Codes: H01F 1/147 : Alloys characterised by their composition treatment thereof for enhancing their electromagnetic properties C21D8/12

Abstract

According to the disclosure, it is possible to increase the magnetic flux density and reduce iron loss by setting a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and at least one of Sb: 0.0010% or more and 0.10% or less, and Sn: 0.0010% or more and 0.10% or less, with the balance being Fe and inevitable impurities, an Ar₃ transformation temperature of 700° C. or higher, a grain size of 80 μm or more and 200 μm or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

Claims

1. A non-oriented electrical steel sheet comprising a chemical composition containing, by mass %,

C:

0.0050% or less,

Si;

1.50% or more and 4.00% or less,

Al;

0.500% or less,

Mn;

0.10% or more and 5.00% or less,

S;

0.0200% or less,

P;

0.200% or less,

N;

0.0050% or less,

O;

0.0200% or less, and

at least one of Sb;

0.0010% or more and 0.10% or less or Sn;

0.0010% or more and 0.10% or less,

with the balance being Fe and inevitable impurities, wherein

the non-oriented electrical steel sheet has an Ar₃ transformation temperature of 700°

C. or higher, a grain size of 80 μ

m or more and 200 μ

m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

2. The non-oriented electrical steel sheet according to claim 1, wherein the chemical composition further contains, by mass %,

Ca:

0.0010% or more and 0.0050% or less.

3. The non-oriented electrical steel sheet according to claim 1, wherein the chemical composition further contains, by mass %,

Ni:

0.010% or more and 3.0% or less.

4. The non-oriented electrical steel sheet according to claim 1, wherein the chemical composition further contains, by mass %,

at least one selected from the group consisting of

Ti:

0.0030% or less,

Nb;

0.0030% or less,

V;

0.0030% or less, and

Zr;

0.0020% or less.

5. A method of producing the non-oriented electrical steel sheet as recited in claim 1, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

6. The non-oriented electrical steel sheet according to claim 2, wherein the chemical composition further contains, by mass %,

Ni:

0.010% or more and 3.0% or less.

7. The non-oriented electrical steel sheet according to claim 2, wherein the chemical composition further contains, by mass %,

at least one selected from the group consisting of

Ti:

0.0030% or less,

Nb;

0.0030% or less,

V;

0.0030% or less, and

Zr;

0.0020% or less.

8. The non-oriented electrical steel sheet according to claim 3, wherein the chemical composition further contains, by mass %,

at least one selected from the group consisting of

Ti:

0.0030% or less,

Nb;

0.0030% or less,

V;

0.0030% or less, and

Zr;

0.0020% or less.

9. The non-oriented electrical steel sheet according to claim 6, wherein the chemical composition further contains, by mass %,

at least one selected from the group consisting of

Ti:

0.0030% or less,

Nb;

0.0030% or less,

V;

0.0030% or less, and

Zr;

0.0020% or less.

10. A method of producing the non-oriented electrical steel sheet as recited in claim 2, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

11. A method of producing the non-oriented electrical steel sheet as recited in claim 3, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

12. A method of producing the non-oriented electrical steel sheet as recited in claim 4, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

13. A method of producing the non-oriented electrical steel sheet as recited in claim 6, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

14. A method of producing the non-oriented electrical steel sheet as recited in claim 7, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

15. A method of producing the non-oriented electrical steel sheet as recited in claim 8, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.

16. A method of producing the non-oriented electrical steel sheet as recited in claim 9, the method comprising performing hot rolling in at least one pass in a dual phase region from γ

-phase to α

-phase.