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Grain oriented electrical steel sheet

A kind of electromagnetic steel plate, directional technology, applied in the direction of inorganic material magnetism, furnace, heat treatment equipment, etc., can solve the problem of limit, achieve the effect of noise suppression and excellent noise characteristics

Active Publication Date: 2013-04-24
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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  • Grain oriented electrical steel sheet
  • Grain oriented electrical steel sheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Manufactured by continuous casting, the component composition contains C: 0.060%, Si: 3.35%, Mn: 0.07%, Se: 0.016%, S: 0.002%, sol.Al: 0.025%, and N: 0.0090% by mass %, and The steel slab whose balance is Fe and unavoidable impurities is heated to 1400°C, hot-rolled into a hot-rolled sheet with a thickness of 2.2 mm, and then annealed at 1,000°C. Next, cold rolling was performed to have an intermediate plate thickness of 1.0 mm, and intermediate annealing was performed at 1000°C. Then, cold rolling was performed to obtain a cold-rolled sheet having a thickness of 0.23 mm.

[0077] Then, a resist was applied by gravure offset printing, followed by electrolytic etching and resist stripping in alkaline solution, at intervals of 3 mm along the rolling direction at an inclination angle of 10° relative to the direction perpendicular to the rolling direction. Linear grooves with a width of 150 μm and a depth of 20 μm were formed.

[0078] Next, decarburization annealing was ...

Embodiment 2

[0086] Manufactured by continuous casting, the component composition contains C: 0.060%, Si: 3.35%, Mn: 0.07%, Se: 0.016%, S: 0.002%, sol.Al: 0.025%, and N: 0.0090% by mass %, and The steel slab whose balance is Fe and unavoidable impurities is heated to 1400°C, hot-rolled into a hot-rolled sheet with a thickness of 2.2 mm, and then annealed at 1,000°C. Next, cold rolling was performed to have an intermediate plate thickness of 1.0 mm, and intermediate annealing was performed at 1000°C. Then, cold rolling was performed to obtain a cold-rolled sheet having a thickness of 0.23 mm.

[0087] Next, decarburization annealing was carried out at 825°C, and then an annealing separator mainly composed of MgO was applied, and final annealing for the purpose of secondary recrystallization and purification was carried out at 1200°C for 10 hours. Then, a tension coating treatment liquid containing 5% by mass of colloidal silica and 25% by mass of magnesium dihydrogen phosphate was applied,...

Embodiment 3

[0095] Manufactured by continuous casting, the composition consists of C: 0.070%, Si: 3.20%, Mn: 0.07%, S: 0.02%, sol.Al: 0.025%, and N: 0.0090% by mass%, and the balance is Fe and The steel slab with unavoidable impurities was heated to 1400°C, and then hot-rolled into a hot-rolled sheet with a thickness of 2.2mm, and then the hot-rolled sheet was annealed at 1,000°C. Next, cold rolling was performed to have an intermediate thickness of 2.0 mm, intermediate annealing was performed at 1000° C., and then cold rolling was performed to obtain a cold-rolled sheet having a thickness of 0.29 mm.

[0096] Then, a resist was applied by gravure offset printing, followed by electrolytic etching and resist stripping in alkaline solution, at intervals of 3 mm along the rolling direction at an inclination angle of 10° relative to the direction perpendicular to the rolling direction. Linear grooves with a width of 150 μm and a depth of 20 μm were formed.

[0097] Next, decarburization anne...

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PUM

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Abstract

Provided is a grain-oriented magnetic steel sheet having excellent noise characteristics which includes a material having grooves for magnetic-domain refinement. When used to assemble a real transformer, the steel sheet can inhibit the transformer from generating a noise. The grain-oriented magnetic steel sheet comprises a steel sheet having grooves for magnetic-domain refinement in the front or back surface thereof and is equipped with a forsterite coating film and a tension coating on each of the front and back surfaces. When the amount of the tension coating adhered to the surface having the grooves is expressed by A (g / m2) and the amount of the tension coating adhered to the surface not having the grooves is expressed by B (g / m2), these amounts (A) and (B) are regulated to given ranges.

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 require 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 technology for reducing iron loss by introducing non-uniform strain or grooves to the surface of the steel sheet by physical or chemical methods, that is, magnetic domain refining technology, is being developed. [0004] For example, Patent Document 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/04C22C38/60H01F1/16H01F1/18
CPCC21D8/1288C22C38/60C22C38/04C22C38/06H01F1/18C22C38/00C21D9/46C22C38/001C21D8/1283C23C30/00C23C26/00C21D8/12C22C38/02H01F1/16Y10T428/12597Y10T428/24612Y10T428/12611Y10T428/2457Y10T428/24628Y10T428/24942Y10T428/12389
Inventor 高岛稔井上博贵冈部诚司
Owner JFE STEEL CORP
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