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Oriented electromagnetic steel plate

An electromagnetic steel plate and directional technology, applied in the direction of circuits, electrical components, magnetic cores/yokes, etc., can solve problems such as existing limits, and achieve the effect of suppressing iron loss and excellent actual iron loss characteristics

Active Publication Date: 2014-12-24
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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  • Oriented electromagnetic steel plate
  • Oriented electromagnetic steel plate
  • Oriented electromagnetic steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A slab comprising, by mass %, C: 0.05%, Si: 3.2%, Mn: 0.06%, Se: 0.02%, and Sb: 0.02%, with the balance consisting of Fe and unavoidable impurities, is produced by continuous casting, After heating to 1400° C., hot rolling was performed to form a hot-rolled sheet having a thickness of 2.6 mm, and then, the hot-rolled sheet was annealed at 1,000° C. Next, by cold-rolling twice via intermediate annealing at 1000° C., it was finished into a cold-rolled sheet having a final sheet thickness of 0.30 mm.

[0090]Then, a resist was applied by gravure offset printing, followed by electrolytic etching and resist stripping in an alkaline solution, thereby forming a film with a width of 150μm linear groove with a depth of 20μm.

[0091] Next, after decarburization annealing at 825°C, an annealing separator mainly composed of MgO was applied, and final annealing for secondary recrystallization and purification was performed at 1200°C for 10 hours.

[0092] Then, a tension coating ...

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Abstract

The present invention provides a grain oriented electrical steel sheet that may keep iron loss at low level when assembled as an actual transformer and has excellent iron loss properties as an actual transformer, in which a film thickness a 1 (µm) of insulating coating at the floors of linear grooves, a film thickness a 2 (µm) of the insulating coating on a surface of the steel sheet at portions other than the linear grooves, and a depth a 3 (µm) of the linear grooves are controlled to satisfy formulas (1) and (2): 0.3 �¢ µm ‰¤ a 2 ‰¤ 3.5 �¢ µm and a 2 + a 3 - a 1 ‰¤ 15 �¢ µm

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as an iron core material for transformers and the like. Background technique [0002] Grain-oriented electrical steel sheets are mainly used as iron cores of transformers, and they are required to have excellent magnetization characteristics, especially low iron loss. [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 technique, is being developed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/00B32B15/04C21D8/12C22C38/00C22C38/04C22C38/60H01F1/16H01F1/18
CPCH01F1/18C22C38/34C21D8/1288C23F17/00C23C22/33C22C38/04C21D8/1255C21D2201/05C23C22/22C23C22/73H01F3/02Y10T428/2457
Inventor 渡边诚冈部诚司高宫俊人
Owner JFE STEEL CORP
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