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Grain-oriented electrical steel sheet, method for forming insulative coating film for grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet

A technology of insulating film and electromagnetic steel sheet, which can be applied to manufacturing tools, circuits, magnetic objects, etc., and can solve the problems of difficulty in reducing iron loss, inability to guarantee the adhesion of insulating film, and difficult magnetic properties of base metal steel sheets.

Active Publication Date: 2021-09-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply suppressing the formation of the glass coating cannot ensure the adhesion of the tension-applying insulating coating and cannot impart sufficient tension to the base steel sheet.
Therefore, it is difficult to reduce the iron loss
[0011] As mentioned above, the current situation is that if the glass coating is omitted from the grain-oriented electrical steel sheet, it is expected that the movement of the magnetic domain walls will be facilitated and the magnetic properties will be improved, but on the other hand, the tension applied to the base steel sheet will inevitably become Difficult to reduce magnetic properties (especially iron loss properties)

Method used

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  • Grain-oriented electrical steel sheet, method for forming insulative coating film for grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet
  • Grain-oriented electrical steel sheet, method for forming insulative coating film for grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet
  • Grain-oriented electrical steel sheet, method for forming insulative coating film for grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0260] Next, the effect of one solution of the present invention will be described in detail through an example, but the conditions in the example are an example of conditions adopted in order to confirm the practicability and effect of the present invention, and the present invention is not limited to this A condition example. The present invention can employ various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

experiment example 1

[0262] The steel slab was heated to 1350° C. and hot-rolled to obtain a hot-rolled steel sheet with an average thickness of 2.3 mm. The steel slab contained C: 0.081% by mass, Si: 3.3% by mass, Mn: 0.083% by mass, and S: 0.022% by mass % (S+Se: 0.022% by mass), acid-soluble Al: 0.025% by mass, Cr: 0.04%, N: 0.008% by mass, Bi: 0.0025% by mass, and the remainder contains Fe and impurities.

[0263] The obtained hot-rolled steel sheet was annealed at 1100° C. for 120 seconds, and then pickled. The pickled steel plate was cold-rolled and finished to an average thickness of 0.23mm to make a cold-rolled steel plate. Thereafter, decarburization annealing was performed on the obtained cold-rolled steel sheet.

[0264] Thereafter, an annealing separator was applied and dried, and subjected to finished annealing at 1200° C. for 20 hours. The annealing separator was composed of a total of 95% by mass of MgO and Al in terms of solid content. 2 o 3 , MgO and Al 2 o 3 The mixing ratio...

experiment example 2

[0287] Steel slab A (steel slab A) and steel slab B (steel slab B) were respectively heated to 1350° C. and hot-rolled to obtain hot-rolled steel sheets with an average thickness of 2.3 mm. The steel slab A (steel slab A) contained C: 0.082 % by mass, Si: 3.3% by mass, Mn: 0.082% by mass, S: 0.023% by mass (S+Se: 0.023% by mass), acid-soluble Al: 0.025% by mass, Cr: 0.05%, N: 0.008% by mass, remaining Partly containing Fe and impurities, the steel slab B (steel slab B) contains C: 0.081% by mass, Si: 3.3% by mass, Mn: 0.083% by mass, S: 0.022% by mass (S+Se: 0.022% by mass), acid Soluble Al: 0.025% by mass, Cr: 0.04%, N: 0.008% by mass, Bi: 0.0025% by mass, and the remainder contains Fe and impurities.

[0288] Each obtained hot-rolled steel sheet was annealed at 1100° C. for 120 seconds, and then pickled. The pickled steel plate was finished by cold rolling to an average thickness of 0.23 mm to obtain a cold rolled steel plate. Thereafter, decarburization annealing was perf...

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Abstract

A grain-oriented electrical steel sheet comprises a base material steel sheet, an oxide layer, and a tension-imparting insulative coating film. When glow discharge optical emission spectrometry is conducted over the area ranging from the surface of the tension-imparting insulative coating film to the inside of the base material steel sheet, sputter time Fe0.5 at which the Fe light emission intensity reaches 0.5 times of the saturation value and sputter time Fe0.05 at which the Fe light emission intensity reaches 0.05 times of the saturation value satisfy (Fe0.5 - Fe0.05) / Fe0.5 >= 0.35, and the Cr light emission intensity reaches the maximum point within a range of from Fe0.05 to Fesat. The magnetic flux density B8 of the grain-oriented electrical steel sheet in the rolling direction is 1.90 T or greater.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet, a method for forming an insulating coating on a grain-oriented electrical steel sheet, and a method for manufacturing a grain-oriented electrical steel sheet. [0002] This application claims priority based on Japanese Patent Application No. 2019-021284 for which it applied in Japan on February 8, 2019, and uses the content here. Background technique [0003] Grain-oriented electrical steel sheet is a steel sheet that contains about 0.5 to 7% by mass of silicon (Si), and uses a phenomenon called secondary recrystallization to concentrate the crystal orientation in the {110}<001> orientation (Goss (Goss) orientation) . The {110}<001> orientation means that the {110} plane of the crystal is arranged parallel to the rolling surface, and the <001> axis of the crystal is arranged parallel to the rolling direction. [0004] Grain-oriented electrical steel sheets are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/00C22C38/60H01F1/147C23C22/00
CPCC21D9/46C22C38/60C23C28/04C21D2201/05C21D6/008C21D8/1277C21D8/1272C21D8/1283C21D8/1216C21D1/76C21D8/1255C21D8/005C22C38/002C22C38/008C22C38/18C22C38/20C22C38/34C22C38/04C22C38/004C23G1/081C23C22/20C23C22/74H01F1/18H01F1/14783C22C38/001C21D8/1222H01F1/147C23C22/78C23C8/10C21D3/04C21D8/0205C21D8/0226C21D8/0236C22C38/06
Inventor 田中一郎片冈隆史竹田和年久保田真光多田裕俊
Owner NIPPON STEEL CORP
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