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Grain-oriented electromagnetic steel sheet, and manufacturing method therefor

A technology of electromagnetic steel sheet and manufacturing method, applied in manufacturing tools, inorganic material magnetism, electron beam welding equipment, etc., can solve the problem of easy peeling off of insulating tension coating, and achieve the effect of excellent film adhesion and low iron loss

Active Publication Date: 2016-05-04
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain a sufficient iron loss reduction effect by this method, the local energy irradiation amount needs to be sufficiently high, so there is a problem that the insulating tension coating is easy to peel off

Method used

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  • Grain-oriented electromagnetic steel sheet, and manufacturing method therefor
  • Grain-oriented electromagnetic steel sheet, and manufacturing method therefor
  • Grain-oriented electromagnetic steel sheet, and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] After heating the steel slabs with various compositions shown in Table 1 at 1410°C, they were hot-rolled into hot-rolled sheets with a plate thickness of 2.4mm, and after performing hot-rolled sheet annealing at 1050°C for 30 seconds, Pickling is carried out, followed by the first cold rolling to make the plate thickness 2.0mm, and after intermediate annealing at 1100°C for 2 minutes, the steel sheet temperature immediately after rolling reaches 210°C to form a plate Cold-rolled sheet with a thickness of 0.23mm. Next, decarburization / primary recrystallization annealing with both decarburization and primary recrystallization is performed on the cold-rolled sheet. The decarburization / primary recrystallization annealing is maintained at 850°C for 4 minute.

[0167] Then, 8 parts by mass of TiO was added with respect to 100 parts by mass of MgO as the main component 2 The annealing separator (Cl content: 0.02 parts by mass relative to 100 parts by mass of MgO), the weight...

Embodiment 2

[0175] For containing C: 0.090%, Si: 3.3%, Mn: 0.10%, Se: 0.020%, sol.Al: 0.030%, N: 0.0090%, Sb: 0.040%, Cu: 0.05% and Cr: 0.10%, The balance is Fe and unavoidable impurities. After heating at 1420°C, the steel slab is hot-rolled into a hot-rolled sheet with a thickness of 1.8mm. The hot-rolled sheet is hot-rolled at 1075°C for 30 seconds. After annealing, pickling is carried out, followed by the first cold rolling with the temperature of the steel strip at 200°C to make the plate thickness 0.35mm, and then coiled into coils, and after aging treatment at 300°C for 5 hours, pass through the second The secondary cold rolling is made into a final cold rolled sheet of 0.23mm. Next, decarburization / primary recrystallization annealing in which both decarburization and primary recrystallization are performed is performed at 830° C. for 2 minutes in a mixed atmosphere of nitrogen, hydrogen, and water vapor.

[0176] Next, under the conditions shown in Table 3, the annealing separato...

Embodiment 3

[0184] For containing C: 0.080%, Si: 3.5%, Mn: 0.08%, S: 0.025%, sol.Al: 0.025%, N: 0.0020%, Sn: 0.040% and Cu: 0.05%, the balance is Fe and The steel slab formed by the composition of unavoidable impurities is heated at 1420°C, and then hot-rolled into a hot-rolled sheet with a thickness of 2.5mm. After the hot-rolled sheet is annealed at 1020°C for 30 seconds, acid Washing, followed by the first cold rolling to form a cold-rolled sheet with a thickness of 1.5mm, and after intermediate annealing at 1075°C for 1 minute, the second cold-rolled sheet with a steel strip temperature of 200°C to obtain a sheet thickness A cold-rolled sheet of 0.30 mm was wound into a coil, aged at 300° C. for 5 hours, and then cold-rolled a third time to form a final cold-rolled sheet with a thickness of 0.23 mm.

[0185]Next, decarburization / primary recrystallization annealing (maintained at 830°C for 2 minutes in a mixed atmosphere of nitrogen, hydrogen, and water vapor) that combines decarburiza...

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Abstract

A grain-oriented electromagnetic steel sheet having a forsterite base film and an insulating tension coating on the surface thereof, wherein if magnetic domain refinement processing is performed by using a laser beam, a plasma flame, or electron beam irradiation, a sufficient iron loss reduction effect is achieved within a range in which film peeling does not occur, said effect being achieved by: the relationships FX(Ti) / FX(Al) >= 0.15 and FX(Ti) / FX(Fe) >= 0.004 being satisfied if FX(Ti) is Ti strength, FX(Al) is Al strength, and FX(Fe) is Fe strength when the surface has been quantitatively analysed by X-ray fluorescence analysis; furthermore, the grain boundary frequency of secondary recrystallised grains in the direction perpendicular to rolling being 20 boundaries / 100 mm or less; and moreover, the relationship t(Fo) / t(C) >= 0.3 being satisfied if t(Fo) is the average thickness of the forsterite base film and t(C) is the thickness of the insulating tension coating.

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, and a method for manufacturing the same. Background technique [0002] A grain-oriented electrical steel sheet is mainly used as a material for an iron core of a transformer, and from the viewpoint of improving the efficiency of a transformer, low iron loss is required as a material property of the grain-oriented electrical steel sheet. [0003] Therefore, in general, in the final annealing, a base coating mainly composed of forsterite is formed on the surface of the steel substrate of the steel plate, and then, during or after the planarizing annealing, a phosphate and glue are coated. A coating (insulating tension coating (insulating tension coating)) containing state silica as a main component to obtain insulation and impart tension to the steel sheet is baked to form a product. Iron loss can be improved by the tensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B23K15/00C21D8/12C21D9/46C22C38/60C23C22/00C23C22/33H01F1/16
CPCC21D9/46C22C38/00C22C38/60H01F1/16C21D8/1266C21D8/1288C21D8/1233C21D8/125C21D8/1283C21D6/005C21D6/008C21D8/1244C21D8/1272C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C21D8/12C21D8/1261C21D8/1277
Inventor 千田邦浩高城重宏大久保智幸
Owner JFE STEEL CORP
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