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Oriented electrical steel sheet and method for manufacturing same

A technology of oriented electrical steel sheets and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, manufacturing tools, circuits, etc., can solve the problems of increased excitation voltage of the iron core, increased leakage flux, etc., and achieve improved duty cycle and improved insulation sexual effect

Active Publication Date: 2021-07-23
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

That is to say, when stacking steel sheets with low iron loss, if the insulation properties of the steel sheets are poor and the leakage flux increases, the excitation voltage of the iron core will increase, and it is necessary to conduct electricity with a design magnetic flux density or higher, so it is not preferable.

Method used

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  • Oriented electrical steel sheet and method for manufacturing same
  • Oriented electrical steel sheet and method for manufacturing same
  • Oriented electrical steel sheet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A cold-rolled sheet having a thickness of 0.27 mm was prepared. This cold-rolled sheet was irradiated with a 1.5 kW Gaussian-mode continuous-wave laser to form grooves with a depth of 15 μm. After the grooves are formed, decarburization and nitriding annealing are performed, and high-temperature annealing is performed after coating MgO.

[0085] When carrying out the above-mentioned process, the above-mentioned process was carried out in such a manner that the metal oxide layer formed on the trench in the sample all had defects at the bottom.

[0086] Then, the viscosity was adjusted to 15 cps, and an insulating layer-forming composition containing silica and aluminophosphate was applied to form an insulating layer.

[0087] Determination of insulation layer thickness, iron loss (W 17 / 50 ) and leakage current, and are shown in Table 1 below.

Embodiment 2

[0089] The embodiment is the same as in Example 1, but the above-mentioned process was carried out in such a manner that the metal oxide layers formed on the trenches in the samples all had defects on the sides.

[0090] The insulating layer was formed after adjusting the viscosity to 50 cps.

[0091] Determination of insulation layer thickness, iron loss (W 17 / 50 ) and leakage current, and are shown in Table 1 below.

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Abstract

An oriented electrical steel sheet according to one embodiment of the present invention has, on the surface of an electrical steel sheet, a groove comprising a bottom part and a side part, has a metal oxide layer on the groove, and has an insulation layer on the metal oxide layer, the steel sheet comprising: a normal groove having the metal oxide layer thicker than 0.5 [mu]m positioned on the bottom part and the side part; and a defective groove having the metal oxide layer not thicker than 0.5 [mu]m positioned on the side part or the bottom part, wherein the thickness of the insulation layer on the normal groove is greater than or equal to 0.5 [mu]m and less than 1.5 [mu]m, and the thickness of the insulation layer on the defective groove is 1.5 to 10 [mu]m.

Description

technical field [0001] The invention relates to an oriented electrical steel sheet and a method for manufacturing the oriented electrical steel sheet. More particularly, the present invention relates to a grain oriented electrical steel sheet and a method of manufacturing a grain oriented electrical steel sheet that improves magnetic properties and hot rolling characteristics by controlling the thickness of an insulating film layer formed on a groove along the thickness of a forsterite layer. Background technique [0002] In order to use a grain-oriented electrical steel sheet as a high-efficiency transformer core, it is preferable to use a core material excellent in iron loss and insulation characteristics of the electrical steel sheet to minimize losses in electronic equipment. [0003] The grain-oriented electrical steel sheet has iron loss characteristics in the rolling direction by aligning the secondary recrystallized grain texture along the rolling direction into a Go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04C23C22/77C23C22/07C23C8/14C23C8/18C23C8/04C23C8/02C21D8/12H01F41/02
CPCC23C8/14C23C8/18C23C8/02C23C22/07C23C22/77C23C28/04H01F41/02C21D8/1283C23C8/80C21D8/1294C21D8/1244C21D8/1277C21D2201/05Y02P10/20C23C8/04H01F41/0233C22C2202/02C21D8/0205C21D8/0236C21D9/46C22C38/00
Inventor 权五烈金佑信朴钟泰
Owner 浦项股份有限公司
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