Method for manufacturing grain-oriented electromagnetic steel sheet

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, circuits, magnetic objects, etc., can solve the problems of rising manufacturing costs, difficulty in securing land, etc., and achieve the effects of good adhesion and good iron loss reduction effect.

Pending Publication Date: 2021-09-07
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] By forming such an intermediate layer, the adhesion of the film can be improved, but since large-scale equipment such as electrolytic treatment equipment and dry coating are required again, it may be difficult to secure land and the manufacturing cost may increase.

Method used

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

Examples

Experimental program
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Effect test

Embodiment

[0244] Next, the effect of one form of the present invention will be described in more detail using an example, but the conditions in the example are an example of conditions adopted to confirm the possibility and effect of the present invention, and the present invention is not limited to this one Condition example.

[0245] In the present invention, various conditions can be adopted as long as the object of the present invention is achieved without departing from the gist of the present invention.

experiment example 1

[0247]The raw material slabs with the compositions shown in Table 1 were soaked at 1150° C. for 60 minutes and then subjected to hot rolling to produce hot-rolled steel sheets with a thickness of 2.3 mm. Next, the hot-rolled steel sheet was held at 1120° C. for 200 seconds, cooled immediately, held at 900° C. for 120 seconds, and then quenched for hot-rolled sheet annealing. After the hot-rolled annealed sheet was annealed, the hot-rolled annealed sheet was subjected to cold rolling after pickling to obtain a cold-rolled steel sheet having a final thickness of 0.23 mm.

[0248] Table 1

[0249]

[0250] This cold-rolled steel sheet (hereinafter "steel sheet") was subjected to decarburization annealing at 850° C. for 180 seconds in an atmosphere of hydrogen:nitrogen ratio of 75%:25%. The steel sheet after decarburization annealing was subjected to nitriding annealing held at 750° C. for 30 seconds in a mixed atmosphere of hydrogen, nitrogen, and ammonia to adjust the nitrog...

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Abstract

A method for manufacturing a grain-oriented electromagnetic steel sheet is characterized by comprising a distortion region formation step of irradiating a grain-oriented electromagnetic steel sheet comprising a matrix steel sheet (1), an intermediate layer (4) arranged on the matrix steel sheet (1) so as to be in contact with the matrix steel sheet (1), and an insulation coating film (3) arranged on the intermediate layer (4) so as to be in contact with the intermediate layer (4) with electron beam to form, on the surface of the matrix steel sheet (1), a distortion region D that extends in a direction orthogonal to the rolling direction of the matrix steel sheet 1, wherein, in the distortion region formation step, a center part of the distortion region D as observed in the rolling direction of the matrix steel sheet 1 and the direction of the extension of the distortion region D is heated to 800 to 2000 DEG C inclusive.

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet excellent in film adhesion. In particular, the present invention relates to a method for producing a grain-oriented electrical steel sheet that is excellent in film adhesion of an insulating film even without a forsterite film. [0002] This application claims priority based on Japanese Patent Application No. 2019-005059 filed in Japan on January 16, 2019, the contents of which are incorporated herein by reference. Background technique [0003] Grain-oriented electrical steel sheet is a soft magnetic material, which is mainly used as the iron core material of the transformer. Therefore, magnetic properties with high magnetization characteristics and low iron loss are required. The magnetization characteristic refers to the magnetic flux density excited when the iron core is excited. The higher the magnetic flux density, the more compact the iron core can ...

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
CPCC21D9/46C22C38/02C22C38/04C21D1/26C21D8/1261C21D1/76C23C8/26C21D8/1283C21D8/1272C21D2201/05C21D6/008C22C38/06C22C38/001C21D8/1255C23C22/08C23C22/74H01F1/18C23C28/04C21D8/1294B23K2103/172B23K2103/04B23K2101/36B23K15/0086B23K15/0093C22C38/004C23C22/00B23K26/355H01F1/147C21D8/1222C21D8/1233C22C38/002
Inventor 新井聪牛神义行滨村秀行山本信次奥村俊介
Owner NIPPON STEEL CORP
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