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Grain-oriented electrical steel sheet and method for manufacturing same

A technology of electromagnetic steel plate and manufacturing method, which is applied in the direction of manufacturing tools, circuits, magnetic objects, etc., to achieve good iron loss reduction effect and good adhesion effect

Pending Publication Date: 2021-08-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of manufacturing a wound core using a grain-oriented electrical steel sheet subjected to magnetic domain control by the strain imparting method, the effect of magnetic domain subdivision (i.e., the effect of abnormal eddy current loss) reduction effect) also disappears

Method used

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  • Grain-oriented electrical steel sheet and method for manufacturing same
  • Grain-oriented electrical steel sheet and method for manufacturing same
  • Grain-oriented electrical steel sheet and method for manufacturing same

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Embodiment

[0225] Next, the effect of a solution of the present invention will be described in detail through an example, but the conditions in the example are a conditional example adopted in order to confirm the practicability and effect of the present invention, and the present invention is not limited to An example of this condition.

[0226] Various conditions can be employed in the present invention as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0227] The raw material slabs with the composition shown in Table 1 were soaked at 1150° C. for 60 minutes, and then subjected to hot rolling to obtain hot-rolled steel sheets with a thickness of 2.3 mm. Next, the hot-rolled steel sheet was subjected to hot-rolled sheet annealing in which 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. The hot-rolled annealed sheet after the anneal...

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Abstract

This grain-oriented electrical steel sheet comprises a base material steel sheet (1), an intermediate layer (4) provide upon the base material steel sheet (1) so as to be in contact therewith, and an insulating coating film (3) provided upon the intermediate layer (4) so as to be in contact therewith, said grain-oriented electrical steel sheet being characterized in that the surface of the base material steel sheet (1) has a groove (G) that extends in a direction intersecting the rolling direction of the base material steel sheet (1), and, if the region between the ends of the groove (G) in cross section in the plane parallel to the rolling direction of the base material steel sheet (1) and to the sheet thickness direction is defined as a groove part (RG), the average thickness of the intermediate layer (4) in the groove part (RG) is 0.5-3.0 times the average thickness of the intermediate layer (4) in regions other than the groove part (RG), and the area ratio of the voids in the insulating coating film (3) in the groove part (RG) is 15% or less.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet excellent in film adhesion. In particular, the present invention relates to a grain-oriented electrical steel sheet having excellent film adhesion of an insulating film even without a forsterite film. [0002] This application claims priority based on Japanese Patent Application No. 2019-005058 for which it applied in Japan on January 16, 2019, and uses the content here. Background technique [0003] Grain-oriented electrical steel sheets are soft magnetic materials and are mainly used as core materials for transformers. Therefore, magnetic properties such as high magnetic properties and low iron loss are required. The so-called magnetic properties are the magnetic flux density induced when the iron core is excited. The higher the magnetic flux density, the more compact the core can be, which is advantageous in terms of the device configuration of the transformer, and is also a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/00C22C38/60C23C22/00H01F1/147
CPCC21D9/46C22C38/60C21D1/76C21D8/1272C21D8/1283C21D10/00C21D8/1261C21D6/008C21D2201/05C21D1/26C22C38/02C22C38/04C22C38/06C22C38/001C23C22/08C23C22/20C23C22/22C23C22/33C23C22/74H01F1/18C21D8/1294C23C22/00H01F1/147C21D6/005C21D8/1222C21D8/1233C22C38/002C22C2202/02
Inventor 牛神义行山本信次高桥史明滨村秀行高谷真介高桥克
Owner NIPPON STEEL CORP
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