# US 12,215,400 B2 · Non-directional electrical steel sheet and method for producing same

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- Number: US 12,215,400 B2
- Document ID: US12215400B2
- Status: Granted
- Kind: B2
- Application number: 17/297,731
- Filed: 2019-11-26
- Published: 2022-02-17
- Granted: 2025-02-04
- Earliest claimed: 2018-11-30
- Assignees: Posco
- Applicants: Posco
- Inventors: Jaewan Hong; June Soo Park; Su-Yong Shin; Yong-Soo Kim
- Web page: https://patentgrep.com/patent/US12215400B2

## CPC

- C21D 9/46: for sheet metals
- C21D 6/00: Heat treatment of ferrous alloys
- C21D 6/005: {containing Mn}
- C21D 6/008: {containing Si}
- C21D 8/12: during manufacturing of articles with special electromagnetic properties
- C21D 8/1205: involving particular fabrication steps or treatments of ingots or slabs
- C21D 8/1222: {Hot rolling}
- C21D 8/1233: {Cold rolling}
- C21D 8/1261: {following hot rolling}
- C21D 8/1272: {Final recrystallisation annealing}
- C22C 38/00: Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00)
- C22C 38/001: {containing N}
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/004: {Very low carbon steels, i.e. having a carbon content of less than 0,01%}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/14: containing titanium or zirconium
- H01F 1/147: Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)}
- H01F 1/14766: {Fe-Si based alloys}
- C22C 2202/02: Magnetic
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si at 0.2 to 4.3%, Mn at 0.05 to 2.5%, Al at 0.1 to 2.1%, Bi at 0.0001 to 0.003%, Ga at 0.0001 to 0.003%, and the balance of Fe and inevitable impurities.

## Claims

### Claim 1

A non-oriented electrical steel sheet including, in wt %, Si at 0.2% to 4.3%, Mn at 0.05% to 2.5%, Al at 0.1% to 2.1%, Bi at 0.0003% to 0.003%, Ga at 0.0005% to 0.003%, and a balance of Fe and inevitable impurities,
wherein the non-oriented electrical steel sheet satisfies Formula 2:
−0.002≤[Bi]+[Ga]≤0.005, [Formula 2]
wherein in Formula 2, [Bi] and [Ga] represent content by wt % of Bi and Ga, respectively.

### Claim 2 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein
the non-oriented electrical steel sheet satisfies Formula 1:
[Iron loss (W15/50) after shearing processing]−[Iron loss (W15/50) after discharge processing]≤0.05 (W/kg). [Formula 1]

### Claim 3 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein
one or more of C, S, N, and Ti are further included in an amount of 0.005 wt % or less, respectively.

### Claim 4 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein
one or more of P, Sn, and Sb are further included in an amount of 0.2 wt % or less, respectively.

### Claim 5 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein
one or more of Cu, Ni, and Cr are further contained in an amount of 0.05 wt % or less, respectively.

### Claim 6 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein
one or more of Zr, Mo, and V are further contained in an amount of 0.01 wt % or less, respectively.