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Grain oriented electrical steel sheet and method for manufacturing the same

A technology of electromagnetic steel sheet and manufacturing method, applied in the direction of inductance/transformer/magnet manufacturing, manufacturing tools, circuits, etc., can solve problems such as the existence of boundaries, and achieve the effect of excellent low iron loss characteristics

Active Publication Date: 2015-04-08
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are limitations in the control of crystal orientation and the reduction of impurities in terms of balance with manufacturing costs, etc.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Steel slabs having the composition shown in Table 1 were produced by continuous casting, heated to 1400° C., hot-rolled into hot-rolled sheets with a thickness of 2.2 mm, and then annealed at 1020° C. for 180 seconds. Next, it is made into an intermediate plate thickness of 0.55mm by cold rolling, and the oxidation degree PH 2 O / PH 2 =0.25, temperature: 1050° C., and time: 90 seconds for intermediate annealing. Then, after removing the secondary scale on the surface by hydrochloric acid pickling, cold rolling was performed again to obtain a cold-rolled sheet having a thickness of 0.23 mm.

[0121] [Table 1]

[0122]

[0123] The balance is Fe and unavoidable impurities

[0124] Then, a resist was applied by gravure offset printing, followed by electrolytic etching and resist stripping in an alkali solution, and a width of 150 μm was formed at an inclination angle of 10° with respect to the direction perpendicular to the rolling direction at intervals of 3 mm. Lin...

Embodiment 2

[0131] About the steel slab of the composition shown in Table 1, it carried out to cold rolling using the same procedure and conditions as Example 1. Then, the surface of the steel sheet was locally pressed with a protruding roll, and linear grooves with a width of 150 μm and a depth of 20 μm were formed at intervals of 3 mm at an inclination angle of 10° relative to the direction perpendicular to the rolling direction. Next, implement the oxidation degree PH 2 O / PH 2 =0.50, After decarburization annealing held at a soaking temperature of 840° C. for 300 seconds, an annealing separator mainly composed of MgO was applied. At this time, as shown in Table 3, the application amount of the annealing separator and the winding tension after the application of the annealing separator were changed. Then, at N 2 :H 2 The final annealing for the purpose of secondary recrystallization and purification was carried out under the conditions of 1230° C. and 100 hours in a mixed atmosphere...

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Abstract

A grain oriented electrical steel sheet is provided where thickness of forsterite film at bottom portions of grooves formed on a surface of the steel sheet is ‰¥ 0.3 µm, groove frequency is ‰¤ 20%, which is abundance ratio of grooves crystal grains directly beneath themselves, each crystal grain having orientation deviating from Goss orientation by ‰¥ 10° and grain size ‰¥ 5 µm, total tension exerted on the steel sheet in rolling direction by forsterite film and tension coating is ‰¥ 10.0 MPa, total tension exerted on the steel sheet in direction perpendicular to rolling direction by forsterite film and tension coating is ‰¥ 5.0 MPa and the total tensions satisfy where A is total tension exerted in rolling direction by forsterite film and tension coating, and B is total tension exerted in direction perpendicular to rolling direction by forsterite film and tension coating.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet suitable for use as an iron core material of a transformer or the like, and a method for producing 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. In addition, there is a limit in the balance between the control of the crystal orientation and the reduction of impurities and the production cost. Therefore, a technique for reducing iron loss by introducing non-uniformity into the surface of the steel sheet by physical means, that is, a magnetic domain refinement technique, is being developed. [0004] For e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B21B3/02C21D8/12C23C22/00H01F1/16H01F1/18C22C38/60
CPCB21B3/02C21D8/1255C22C38/34C22C38/06Y10T428/2457H01F41/00C21D8/1283H01F1/18C22C38/04C22C38/08C22C38/001C22C38/00C21D8/1272C21D8/1288C21D8/1294C21D9/46Y10T428/24612
Inventor 大村健井上博贵山口广冈部诚司
Owner JFE STEEL CORP
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