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Grain-oriented electrical steel sheet and manufacturing method thereof

A technology for oriented electrical steel sheets and manufacturing methods, which is applied in the coating process and coating of metal materials, can solve the problems that it is difficult to ensure the improvement rate of iron loss and cannot show the improvement effect of iron loss, and achieve excellent iron loss improvement rate, High resistivity, effect of suppressing deterioration

Active Publication Date: 2017-04-12
浦项股份有限公司
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  • Summary
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Problems solved by technology

[0005] However, the magnetic domain refinement method that relies on pulsed lasers does not form a melting zone because the grooves are formed by evaporation, and it is difficult to ensure the iron loss improvement rate before heat treatment (stress relief heat treatment, SRA). (above 0.1m / s) it is difficult to form deep grooves, and the required iron loss improvement effect cannot be exhibited

Method used

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  • Grain-oriented electrical steel sheet and manufacturing method thereof
  • Grain-oriented electrical steel sheet and manufacturing method thereof

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Embodiment

[0074] The slab is reheated to 1150° C. and then hot-rolled to produce a hot-rolled steel sheet. The slab contains C: 0.0030%, Si: 3.0%, S: 0.001%, Al: 0.05%, N : 0.0013%, Mn: 0.2%, and the balance is Fe and other unavoidable impurities. This hot-rolled steel sheet is coiled, cooled, pickled, and then cold-rolled to produce a cold-rolled steel sheet.

[0075] The thickness of the cold-rolled steel sheet was 0.23 mm, and an organic layer composed of novolac resin, diazide compound, and volatile organic solvent was formed on the surface of the cold-rolled steel sheet with a thickness of 1 μm.

[0076] Grooves are formed by irradiating the surface of the steel sheet coated with the organic layer with a continuous wave laser.

[0077] At this time, the laser energy density E d 1.0J / mm 2 , and are scanned at 87° relative to the rolling direction. Moreover, at this time, the scanning lines of the continuous wave laser are scanned separately along the width direction, such as f...

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Abstract

An electrical steel sheet according to one embodiment of the present invention forms a coating layer comprising titanium carbide, titanium oxide, titanium nitride or mixture or compound thereof in a trench.

Description

technical field [0001] The invention relates to a oriented electrical steel plate and a manufacturing method thereof. Background technique [0002] Generally, magnetic domain refinement methods are roughly classified into temporary domain refinement and permanent magnetic domain refinement according to whether the improvement effect of magnetic domain refinement is maintained after stress relief annealing. [0003] The temporary magnetic domain refinement method is a magnetic domain refinement technology that forms a 90° domain (Domain) to refine the magnetic domain, thereby minimizing the magnetoelastic energy generated by applying local compressive stress on the surface through thermal energy or mechanical energy. [0004] The permanent magnetic domain refinement methods that can maintain the iron loss improvement effect after stress relief heat treatment are roughly divided into etching method, rolling method, and laser method. In the laser method, especially the permane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12
CPCC23C30/00
Inventor 权五烈李原杰
Owner 浦项股份有限公司
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