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Method for manufacturing grain-oriented electrical steel sheet

A technology of electromagnetic steel sheet and manufacturing method, which can be applied to manufacturing tools, circuits, magnetic objects, etc., can solve the problems of difficulty in bonding the surface of insulating coated mother steel sheet and cannot obtain tightness, etc., and achieve magnetic properties and coating density. Excellent effect

Pending Publication Date: 2021-08-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, in the manufacturing methods of Patent Document 1 and Patent Document 2, when the insulating coating is formed in contact with the surface of the base steel plate (directly on the surface of the base steel plate), there is a problem that the insulating coating is difficult to maintain on the surface of the base steel plate. Adhesion (sufficient adhesion) problem

Method used

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  • Method for manufacturing grain-oriented electrical steel sheet
  • Method for manufacturing grain-oriented electrical steel sheet
  • Method for manufacturing grain-oriented electrical steel sheet

Examples

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Embodiment 1

[0233] Next, examples of the present invention will be described, but the conditions in the examples are examples of conditions employed to confirm the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. The present invention can employ various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0234] Among steel slabs having chemical compositions shown in Table 1, No.A13 and No.a11 were heated to 1350° C. and subjected to hot rolling to obtain hot-rolled steel sheets with a thickness of 2.6 mm. The hot-rolled steel sheet is annealed at 1100°C, followed by annealing at 900°C. After annealing, pickling is performed to remove scale formed on the surface, and then cold rolling or inserting is performed once. Multiple times of cold rolling followed by intermediate annealing was performed to produce a cold-rolled steel sheet with a ...

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Abstract

A method of manufacturing a grain-oriented electrical steel sheet involves controlling the degree of oxidation (PH2O / PH2) in a decarburization annealing step, controlling the mass ratio of MgO and Al2O3 within an annealing separator in an annealing separator application step, controlling the degree of oxidation in the case that hydrogen is present or controlling the dew point in the case that only an inert gas is present in a final annealing step, and controlling the baking temperature and the heat treatment temperature in an insulating coating film formation step.

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet. [0002] This application claims priority based on Japanese Patent Application No. 2019-004874 filed in Japan on January 16, 2019, the contents of which are incorporated herein by reference. Background technique [0003] Grain-oriented electrical steel sheets are mainly used in transformers. A transformer is continuously excited for a long period of time from installation to disposal, and energy loss continues to occur. Therefore, energy loss when AC is magnetized, that is, iron loss, is the main index for determining the performance of a transformer. [0004] In order to reduce the iron loss of a grain-oriented electrical steel sheet, many methods have been proposed so far. For example, regarding the structure of steel sheets, it is a method of increasing the concentration on the {110}<001> orientation called Goss orientation, and of steel sheets, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/00C22C38/60H01F1/147C23C22/00
CPCC21D9/46C22C38/60C21D2201/05C21D6/008C21D10/00C21D8/1233C21D8/1283C21D8/1272C21D8/1255C21D1/76C22C38/34C22C38/02C22C38/04C22C38/06C22C38/001C22C38/002C22C38/12C22C38/14C22C38/16C22C38/008C22C38/18C22C38/32C22C38/24C23G1/081C23C22/08C23C22/33C23C22/74H01F1/18H01F1/14783Y02P10/20C22C38/42C22C38/54C22C38/46C22C38/48C22C38/50C22C38/44C21D8/1222C21D8/1261C23C22/00C23G1/02C21D8/1288C23C22/07C23C28/04
Inventor 高谷真介牛神义行中村修一长野翔二奥村俊介
Owner NIPPON STEEL CORP
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