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Grain-oriented magnetic steel sheet and process for producing same

A technology of an electromagnetic steel sheet and a manufacturing method, which is applied in the direction of magnetism of inorganic materials, can solve problems such as the existence of limits, and achieve the effect of large iron loss reduction effect.

Inactive Publication Date: 2013-05-08
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are limits to the control of crystal orientation and the reduction of impurities in terms of balance with manufacturing costs.

Method used

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  • Grain-oriented magnetic steel sheet and process for producing same
  • Grain-oriented magnetic steel sheet and process for producing same
  • Grain-oriented magnetic steel sheet and process for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0105] A slab containing the composition shown in Table 1 with the balance being Fe and unavoidable impurities was produced by continuous casting, heated to 1450°C, and hot-rolled into a hot-rolled sheet with a thickness of 1.8mm. Annealing of the hot-rolled sheet was performed at 1100° C. for 180 seconds. Next, it was finished by cold rolling into a cold-rolled sheet having a final sheet thickness of 0.23 mm. At this time, the cooling rate in the temperature range of 350 to 750° C. in the cooling process of annealing the hot-rolled sheet is changed in the range of 20 to 60° C. / second.

[0106] [Table 1]

[0107]

[0108] Then, a resist was applied by gravure offset printing, followed by electrolytic etching and resist stripping in an alkaline solution, thereby, at an inclination angle of 7.5° with respect to the direction perpendicular to the rolling direction, at an angle of 4.5 mm Linear grooves with a width of 200 μm and a depth of 25 μm were formed at intervals.

[...

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Abstract

A grain-oriented magnetic steel sheet having linear grooves for magnetic domain refinement which have been formed in a surface of the steel sheet is produced in accordance with the present invention so that the proportion of linear grooves under which crystal grains having a deviation in orientation from the Goss orientation of 10 degrees or more and having a grain diameter of 5 [mu]m or more are present is regulated to 20% or less, and that the crystal grains formed by secondary recrystallization are regulated so as to have an average beta angle of 2.0 degrees or less and the crystal grains formed by secondary recrystallization which have a grain diameter of 10 mm or more are regulated so as to have an average width of beta-angle fluctuations of 1-4 degrees. Due to the formation of the linear grooves for magnetic domain refinement, a grain-oriented magnetic steel sheet reduced in iron loss can be obtained.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as an iron core material for a transformer and the like, and a method for manufacturing the same. Background technique [0002] Grain-oriented electrical steel sheets are mainly used as iron cores of transformers, and require excellent magnetization characteristics, especially low iron losses. [0003] Therefore, it is important to highly align the secondary recrystallized grains in the steel sheet with the (110)[001] orientation (so-called Goss orientation) and to reduce impurities in the finished steel sheet. However, the control of crystal orientation and the reduction of impurities have limitations in terms of balance with production costs and the like. Therefore, a technique for reducing the iron loss by introducing non-uniform strain to the surface of the steel plate by physical means to refine the width of the magnetic domain, that is, a magnetic domain refinement tec...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/12H01F1/16C22C38/60
CPCC22C38/34C21D8/1283C22C38/04C21D8/1277C22C38/60C21D8/1233H01F1/16C22C38/00C22C38/06C22C38/02C21D2201/05C21D8/12C22C38/08C22C38/001
Inventor 大村健井上博贵山口广冈部诚司早川康之
Owner JFE STEEL CORP
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