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Grain-oriented electromagnetic steel sheet, and steel sheet which can be used as raw material sheet for grain-oriented electromagnetic steel

An electromagnetic steel sheet and directional technology, which is applied in the direction of circuits, magnetic objects, magnetic materials, etc., can solve problems such as the inability to fully meet the high performance requirements of directional electromagnetic steel sheets

Pending Publication Date: 2021-08-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned technology alone cannot fully meet the demand for high performance of grain-oriented electrical steel sheets in recent years.

Method used

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  • Grain-oriented electromagnetic steel sheet, and steel sheet which can be used as raw material sheet for grain-oriented electromagnetic steel
  • Grain-oriented electromagnetic steel sheet, and steel sheet which can be used as raw material sheet for grain-oriented electromagnetic steel
  • Grain-oriented electromagnetic steel sheet, and steel sheet which can be used as raw material sheet for grain-oriented electromagnetic steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Decarburization annealing is performed on a cold-rolled steel sheet for producing a grain-oriented electrical steel sheet with a thickness of 0.23 mm and Si: 3.2% by mass, and an annealing separator having a composition described in Table 1 is coated on the surface of the decarburization-annealed steel sheet. After the water slurry is dried, it is rolled into a coil shape. Next, the decarburized annealed steel sheet was secondary recrystallized in a dry nitrogen atmosphere, followed by purification annealing (final annealing) at 1200° C. in the BAF atmosphere described in Table 1 to obtain a final-annealed grain-oriented silicon steel sheet.

[0097] These final-annealed steel sheets were subjected to powder-removing pickling treatment under various conditions shown in Table 1. Then, sinter annealing is performed on the pickled steel sheet. Conditions of sintering annealing are as follows. 5g / m2 per side 2 A tensioned insulating coating containing aluminum phosphate ...

Embodiment 2

[0113] Grain-oriented electrical steel sheets were produced by the same procedure as in Example 1, under the production conditions in which the pickling time was changed as described in Table 2. In addition, the manufacturing conditions which are not described in Table 2 are the same as the original plate A4 of Table 1. These evaluation results are shown in Table 2.

[0114] Table 2

[0115]

[0116] All grain-oriented electrical steel sheets composed of base steel sheets having RzL within the range of the present invention exhibit good magnetic properties.

[0117] On the other hand, a grain-oriented electrical steel sheet having a surface roughness in the L direction outside the range of the present invention suffers from impaired magnetic properties due to failure to satisfy the production conditions of the present invention. Specifically, the grain-oriented electrical steel sheet whose pickling time was 120 seconds did not satisfy RzL≦6.0, so the magnetic properties w...

Embodiment 3

[0119] By the same procedure as in Example 1, grain-oriented electrical steel sheets were produced under the production conditions of varying pickling temperature and acid concentration as described in Table 3. In addition, the manufacturing conditions which are not described in Table 3 are the same as the original board A3 of Table 1. These evaluation results are shown in Table 3.

[0120] table 3

[0121]

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Abstract

A grain-oriented electromagnetic steel sheet according to one aspect of the present invention is a grain-oriented electromagnetic steel sheet which comprises a base steel sheet and a tension insulating coating film arranged on the surface of the base steel sheet, and the grain-oriented electromagnetic steel sheet is characterized in that the L-direction ten-point average roughness RzL obtained by removing the tension insulating coating film from the grain-oriented electromagnetic steel sheet with an alkaline solution and then measuring the surface of the base steel sheet in the rolling direction is 6.0 [Mu]m or less.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet and a steel plate used as a raw material for a grain-oriented electrical steel sheet. [0002] This application claims priority based on Japanese Patent Application No. 2019-5127 filed in Japan on January 16, 2019, the contents of which are incorporated herein by reference. Background technique [0003] In general, grain-oriented electrical steel sheets are used as iron cores of transformers, etc. Since the magnetic properties of grain-oriented electrical steel sheets greatly affect the performance of transformers, various researches and developments have been conducted to improve the magnetic properties. As means for reducing the iron loss of a grain-oriented electrical steel sheet, for example, the following patent document 1 discloses a technique of coating a solution mainly composed of colloidal silica and phosphate on the surface of the steel sheet after final annealing. Aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/00H01F1/147C23C22/00C23C22/78
CPCC21D9/46C21D2201/05C21D8/1277C21D8/1272C21D8/1288C21D8/1233C22C38/02C21D6/008C23G1/081C23C22/20C23C22/74H01F1/18C21D8/1283C21D8/1222C23C22/00H01F1/147C21D8/1255C23C22/78
Inventor 中村修一牛神义行藤井浩康
Owner NIPPON STEEL CORP
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