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Grain-oriented electrical steel sheet and its magnetic domain refinement method

A technology of oriented electrical steel sheet and magnetic domain refinement, which is applied in the direction of manufacturing tools, metal processing equipment, laser welding equipment, etc., can solve the problems of damaged roughness and difficulty in removing bulges, etc.

Active Publication Date: 2021-09-10
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the process of brushing the surface or melting it with acid, the roughness is severely compromised and the bumps are not easily removed

Method used

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  • Grain-oriented electrical steel sheet and its magnetic domain refinement method
  • Grain-oriented electrical steel sheet and its magnetic domain refinement method
  • Grain-oriented electrical steel sheet and its magnetic domain refinement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Embodiment 1: Forming the prefabricated trench

[0071] A cold-rolled grain-oriented electrical steel sheet having a thickness of 0.20 mm was prepared. The surface of the electrical steel sheet was coated with a coating liquid mixed with MgO and water at a weight ratio of 1:1, and dried at 100° C. to form a mask layer with a thickness of 5 μm. The single-fiber laser light having the output collated in Table 1 below was irradiated at the irradiation speed collated in Table 1 below. At this time, the moving speed of the steel plate is also sorted out in Table 1 below. In addition, the focus positions of the laser beams and the intervals on the surface of the grain-oriented electrical steel sheet are organized in Table 1 below. The width and depth of the pre-grooves formed by laser irradiation are collated in Table 1 below. The width of the prefabricated groove refers to the width on the surface of the steel plate.

[0072] [Table 1]

[0073]

Embodiment 2

[0074] Example 2: Forming a trench

[0075] The steel plates formed with the pregrooves in Inventive Examples 1 to 7 were pickled with hydrochloric acid having the concentration sorted in Table 2 below, and the pickling time was sorted out in Table 2 below. The upper width W of the final trench a Keep constant at 120 μm. The depth D of the groove, the middle width W at 1 / 2 depth b , the ratio of the upper width to the middle width (W b / W a ), the roughness of the groove part is arranged in the following table 2. The roughness adopts JIS97 standard.

[0076] [Table 2]

[0077]

Embodiment 3

[0084] Embodiment 3: Form insulating film layer and measure magnetism, duty cycle

[0085] An insulating coating liquid containing colloidal silica and metal phosphate was coated on the grain-oriented electrical steel sheets in which grooves were formed in Inventive Examples 8 to 17 and Comparative Examples 1 and 2, and heat-treated to form grooves on the surface of the steel sheets. Insulating film layer, and after measuring the magnetic properties and duty cycle, they are arranged in Table 4 below.

[0086] Regarding the iron loss improvement rate, the iron loss (W 1 ) and iron loss after laser irradiation to form grooves (W 2 ) after measurement, by (W 1 -W 2 ) / W 1 To calculate the iron loss improvement rate.

[0087] The duty ratio was measured by stacking 14 samples of 60 mm×300 mm and calculating the iron area relative to the total area.

[0088] [Table 4]

[0089] Classification Iron loss improvement rate (%) Duty cycle (%) Invention Example 8 ...

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Abstract

According to an embodiment of the present invention, the magnetic domain refinement method of a grain-oriented electrical steel sheet comprises: a step of preparing a grain-oriented electrical steel sheet; a step of forming a mask layer on the surface of the grain-oriented electrical steel sheet; and irradiating a laser beam to a part of the mask layer A step of forming a prefabricated groove on the oriented electrical steel sheet by removing the mask layer; and a step of acid washing the oriented electrical steel sheet to form the groove.

Description

technical field [0001] The invention relates to a oriented electrical steel sheet and a magnetic domain refinement method thereof. Background technique [0002] Grain-oriented electrical steel sheets are used as core materials for electrical products such as transformers. Therefore, in order to reduce the power loss of electrical equipment and improve the energy conversion efficiency, the iron core material should be excellent in iron loss, and a steel plate with a high duty ratio when stacked and coiled is required. [0003] Oriented electrical steel sheet refers to the functional properties of grains that have been recrystallized secondary to the hot rolling, cold rolling and annealing process and arranged in {110}<001> orientation along the rolling direction (also known as "Gaussian texture") steel plate. [0004] As a method for reducing the core loss of grain-oriented electrical steel sheets, a magnetic domain refinement method is known. That is, for the magnet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C21D8/12C23G1/08C23F4/00B23K26/364
CPCB23K26/364C21D8/12C21D10/00C23F4/00C23G1/08C21D8/1294C21D10/005
Inventor 朴世珉韩奎锡权五烈权玟锡朴钟泰闵基荣李原杰
Owner 浦项股份有限公司
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