# US 2025/0154618 A1 · Method of manufacturing a grain-oriented electrical steel sheet

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- Number: US 2025/0154618 A1
- Document ID: US20250154618A1
- Status: Published application
- Kind: A1
- Application number: 19/020,031
- Filed: 2025-01-14
- Published: 2025-05-15
- Earliest claimed: 2020-05-19
- Assignees: Jfe Steel Corporation
- Applicants: Jfe Steel Corporation
- Inventors: Hirotaka INOUE; Takeshi OMURA; Yoshihisa ICHIHARA; Shigehiro TAKAJO; Kunihiro SENDA
- Web page: https://patentgrep.com/patent/US20250154618A1

## CPC

- C21D 9/46: for sheet metals
- B23K 26/082: Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
- B23K 26/352: for surface treatment
- C21D 6/008: {containing Si}
- C21D 8/1222: {Hot rolling}
- C21D 8/1233: {Cold rolling}
- C21D 8/1255: {with diffusion of elements, e.g. decarburising, nitriding}
- C21D 8/1266: {between cold rolling steps}
- C21D 8/1272: {Final recrystallisation annealing}
- C21D 8/1283: {Application of a separating or insulating coating}
- C21D 8/1294: involving a localised treatment
- C21D 10/005: {by laser shock processing}
- C23C 22/20: containing aluminium cations
- C23C 22/74: for obtaining burned-in conversion coatings
- C25F 3/14: locally
- H01F 1/16: in the form of sheets (H01F1/147 takes precedence)
- C22C 38/001: {containing N}
- 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 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/16: containing copper
- C22C 38/34: with more than 1.5% by weight of silicon
- C22C 38/60: containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
- 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)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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)
- C25F: PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method of manufacturing a grain-oriented electrical steel sheet includes sequentially subjecting a slab for grain-oriented electrical steel sheet to hot rolling, cold rolling, decarburization annealing, final annealing after applying an annealing separator to a surface of the steel sheet, and flattening annealing. After the cold rolling and before the applying of an annealing separator, resist ink is applied to one side of the steel sheet. A laser is repeatedly scanned across a rolling direction of the steel sheet on the applied surface to remove resist ink. Electrolytic etching is applied on the removed areas to form grooves that extend linearly across the rolling direction and are lined up at intervals in the rolling direction. The scanning of the laser is performed with an irradiation energy of the laser being less than 30 J/m and a temperature of the steel sheet being 40° C. to 200° C.

## Claims

### Claim 1

A method of manufacturing a grain-oriented electrical steel sheet, comprising a series of processes of subjecting a slab for grain-oriented electrical steel sheet to hot rolling to obtain a hot-rolled sheet, then subjecting the hot-rolled sheet to cold rolling once or two or more times with intermediate annealing performed therebetween to obtain a steel sheet with a final thickness, then subjecting the steel sheet to decarburization annealing, then subjecting the steel sheet to final annealing after applying an annealing separator to a surface of the steel sheet, and then subjecting the steel sheet to flattening annealing, wherein
after the cold rolling and before the applying of an annealing separator, resist ink is applied to one side of the steel sheet, a laser is repeatedly scanned in a linear fashion across a rolling direction of the steel sheet on the applied surface at intervals in the rolling direction, the resist ink is removed from areas irradiated by the laser, and then electrolytic etching is applied on the removed areas to form a plurality of grooves that extend linearly across the rolling direction of the steel sheet and are lined up at intervals in the rolling direction, and
the scanning of the laser is performed with an irradiation energy of the laser being less than 30 J/m and a temperature of the steel sheet being 40° C. or higher and lower than 200° C.