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Grain-oriented electrical steel plate and method for producing same

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 reduced productivity, and achieve the effects of excellent adhesion, excellent adhesion between magnetic properties and film, and excellent magnetic properties

Active 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

[0015] However, in order to form an external oxide type oxide film, it is necessary to perform heat treatment before the insulating film is formed, and the productivity is reduced.

Method used

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  • Grain-oriented electrical steel plate and method for producing same
  • Grain-oriented electrical steel plate and method for producing same
  • Grain-oriented electrical steel plate and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] An annealing separator was coated on a primary recrystallized decarburized annealed sheet (sheet thickness: 0.23 mm) having the chemical composition shown in Table 1-1, and dried. The components of the decarburized annealed sheet were measured by ICP-AES, C and S were measured by combustion-infrared absorption method, and N was measured by inert gas melting-thermal conductivity method. As an annealing separator, use Al 2 o 3 and MgO, the weight of MgO relative to Al 2 o 3 The annealing separator adjusted to the ratio of the total weight of MgO and the BET specific surface area of ​​MgO to the value described in Table 2. In addition, for the Al used in the annealing separator 2 o 3 , collect X-ray diffraction patterns in the range of about 2θ=10-70°. Then, the interplanar spacing is obtained for each diffraction line, and then the obtained interplanar spacing is compared with the α-phase Al in the JCPDS card. 2 o 3 interplanar spacing and κ-phase Al 2 o 3 Check...

Embodiment 2

[0147] A unidirectional electrical steel sheet was produced under the same conditions as in Example 1. However, in this example, Al 2 o 3 The proportion of the κ phase and the coating amount of the annealing separator also changed.

[0148] Samples were collected from the obtained unidirectional electrical steel sheet, and the amount of spinel formed between the steel sheet and the spinel was measured by the same method as in Example 1 to evaluate iron loss and film adhesion.

[0149] The results are shown in Table 3.

[0150]

[0151] As shown in Table 3, it can be seen that the grain-oriented electrical steel sheet obtained under these conditions has low iron loss and excellent coating adhesion.

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Abstract

The grain-oriented electrical steel plate is characterized by having a steel plate, an insulating film arranged on the steel plate, and spinel present fitted into the insulating film in a part on the steel plate that is at the interface of the steel plate and the insulating film, and by the amount of spinel being 5-50 mg / m2 per unit area of the surface of the steel plate.

Description

technical field [0001] The present invention relates to a unidirectional electrical steel sheet and a manufacturing method thereof. This application claims priority based on Japanese Patent Application No. 2019-005131 filed in Japan on January 16, 2019, the contents of which are incorporated herein. Background technique [0002] Unidirectional electrical steel sheets (unidirectional silicon steel sheets) are mostly used as core materials for transformers. Transformers are continuously used for a long period of time from installation to disposal, and energy losses continue to occur. Therefore, as an iron core material, in order to reduce energy loss, a material with low iron loss is required. Applying tension to the steel sheet is effective in reducing iron loss. Therefore, by forming a film made of a material having a lower thermal expansion coefficient than the steel plate at a high temperature, tension generated during cooling due to the difference in thermal expansion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22C38/00C22C38/60H01F1/147C23C22/00
CPCC21D9/46C21D2201/05C21D8/1283C21D8/1272C21D1/04C22C38/02C21D6/008C22C38/04C22C38/008C22C38/06C22C38/001C22C38/16C22C38/002C23C22/33C23C22/74H01F1/18Y02P10/20C23C22/00H01F1/147C21D8/1288C22C38/00C23C22/07C21D3/04C21D8/0205C21D8/0226C21D8/0236C21D8/0273C23C22/78
Inventor 藤井浩康竹林圣记牛神义行片冈隆史奥村俊介
Owner NIPPON STEEL CORP
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