# US 12,215,401 B2 · Grain-oriented electrical steel sheet

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- Number: US 12,215,401 B2
- Document ID: US12215401B2
- Status: Granted
- Kind: B2
- Application number: 17/422,048
- Filed: 2020-01-16
- Published: 2022-04-21
- Granted: 2025-02-04
- Earliest claimed: 2019-01-16
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Shinsuke Takatani; Yoshihiro Arita; Shunsuke Okumura; Shohji Nagano
- Web page: https://patentgrep.com/patent/US12215401B2

## CPC

- C21D 9/46: for sheet metals
- C22C 38/004: {Very low carbon steels, i.e. having a carbon content of less than 0,01%}
- C21D 8/0257: {with diffusion of elements, e.g. decarburising, nitriding}
- C21D 8/1222: {Hot rolling}
- C21D 8/1233: {Cold rolling}
- C21D 8/1272: {Final recrystallisation annealing}
- C21D 8/1283: {Application of a separating or insulating coating}
- 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 38/008: {containing tin}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/08: containing nickel {(C22C38/105 takes precedence)}
- C22C 38/16: containing copper
- C22C 38/60: containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
- C23C 22/08: Orthophosphates
- C23C 22/74: for obtaining burned-in conversion coatings
- H01F 1/14791: {Fe-Si-Al based alloys, e.g. Sendust}
- H01F 1/18: with insulating coating
- C21D 1/76: Adjusting the composition of the atmosphere
- C21D 6/008: {containing Si}
- C21D 8/1255: {with diffusion of elements, e.g. decarburising, nitriding}
- C21D 2201/05: Grain orientation
- Y02P 10/20: Recycling
- 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)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A grain-oriented electrical steel sheet of the present invention has a base steel sheet, an amorphous oxide layer formed on the base steel sheet, and a tension-insulation coating formed on the amorphous oxide layer, in which the base steel sheet contains, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80 to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0 to 0.80%, N: 0 to 0.012%, P: 0 to 0.50%, Ni: 0 to 1.00%, Sn: 0 to 0.30%, and Sb: 0 to 0.30%, a remainder is Fe and an impurity, a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 to 70, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 to 70.

## Claims

### Claim 1

A grain-oriented electrical steel sheet comprising:
a base steel sheet;
an amorphous oxide layer formed on the base steel sheet; and
a tension-insulation coating formed on the amorphous oxide layer,
wherein the base steel sheet contains, as a chemical composition, by mass %,
C: 0.085% or less,
Si: 0.80 to 7.00%,
Mn: 1.50% or less,
acid-soluble Al: 0.065% or less,
S: 0.013% or less,
Cu: 0 to 0.80%,
N: 0 to 0.012%,
P: 0 to 0.50%,
Ni: 0 to 1.00%,
Sn: 0 to 0.30%, and
Sb: 0 to 0.30%,
a remainder is Fe and an impurity,
a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 or more and less than 30.0, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 or more and less than 30.0,
wherein the amorphous oxide layer is an external oxidation-type layer in which some of an amorphous oxide intrudes into an interface between the steel sheet and the amorphous oxide and an aspect ratio is less than 1.2, and
wherein the aspect ratio is represented by a ratio between the length of the intrusion portion in a depth direction and a length of a bottom side of the intrusion portion.

### Claim 2 (depends on 1)

The grain-oriented electrical steel sheet according to claim 1,
wherein the base steel sheet contains, as the chemical composition, by mass %, Cu: 0.01 to 0.80%.

### Claim 3 (depends on 1)

The grain-oriented electrical steel sheet according to claim 1,
wherein the base steel sheet contains, as the chemical composition, by mass %, one or more of N: 0.001 to 0.012%, P: 0.010 to 0.50%, Ni: 0.010 to 1.00%, Sn: 0.010 to 0.30%, and Sb: 0.010 to 0.30%.

### Claim 4 (depends on 2)

The grain-oriented electrical steel sheet according to claim 2,
wherein the base steel sheet contains, as the chemical composition, by mass %, one or more of N: 0.001 to 0.012%, P: 0.010 to 0.50%, Ni: 0.010 to 1.00%, Sn: 0.010 to 0.30%, and Sb: 0.010 to 0.30%.

### Claim 5 (depends on 1)

The grain-oriented electrical steel sheet according to claim 1,
wherein an iron loss is less than 0.90 W/kg.