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Method for manufacturing grain-oriented electrical steel sheet

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, circuits, magnetic materials, etc., can solve the problems that the surface of the insulating film-coated mother steel plate is difficult to seal, and the adhesion cannot be obtained, and achieves magnetic properties and film tightness. excellent compatibility

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

Experimental program
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Embodiment 1

[0230] Next, examples of the present invention will be described, but the conditions in the examples are examples of conditions adopted for confirming 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.

[0231] 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. This hot-rolled steel sheet was cold-rolled once or multiple times with intermediate annealing inserted, to obtain a cold-rolled steel sheet with a final thickness of 0.22 mm. The cold-rolled steel sheet having a thickness of 0.22 mm was decarburized annealed under the conditions shown in Tables 2 to 4 as a decarburized annealing ste...

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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 volume ratio of hydrogen in a mixed gas atmosphere to 50% or greater in a final annealing step, washing by using a solution to which an inhibitor has been added and then acid washing in an annealing separator removal step, controlling a mixed gas and the temperature and annealing in a smoothing 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. 2019-005132 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, for the steel plate structure, it is a method of increasing the concentration on the {110}<001> orientation called Goss orientation; plate thickness method, etc. ...

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
CPCC21D9/46C22C38/60C21D2201/05C21D1/76C21D10/00C21D8/1255C21D8/1283C21D8/1272C21D6/008C21D8/1277C21D8/1233C22C38/02C22C38/04C22C38/06C22C38/001C22C38/16C22C38/14C22C38/32C22C38/24C22C38/002C22C38/12C22C38/008C22C38/08C23C22/74C23C22/08H01F1/18H01F1/14783Y02P10/20C22C38/34C22C38/42C22C38/54C22C38/46C22C38/48C22C38/44C22C38/50C21D8/1222C23C22/00H01F1/147C21D8/1288C23C22/07C21D8/1261C21D8/1266
Inventor 高谷真介牛神义行
Owner NIPPON STEEL CORP
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