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Grain-oriented electrical steel sheet

An electromagnetic steel plate and directional technology, applied in the direction of circuits, magnetic objects, magnetic materials, etc., can solve the problems of iron loss adverse effects, hindering the movement of magnetic domain walls, etc.

Pending Publication Date: 2021-08-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smooth and rapid movement of the magnetic domain walls is effective for reducing iron loss, but since the forsterite-based coating has a concave-convex structure at the steel plate / coating interface, the concave-convex structure hinders the movement of the magnetic domain walls. damage to adverse effects

Method used

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  • Grain-oriented electrical steel sheet
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  • Grain-oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] A silicon steel slab having a composition shown in Table 1 (the remainder being Fe and impurities) was heated to 1100°C and subjected to hot rolling to prepare a hot-rolled steel sheet with a thickness of 2.6 mm, and the hot-rolled sheet was subjected to a temperature of 1100°C. After annealing, a single cold rolling was performed to prepare a cold-rolled steel sheet with a final thickness of 0.23 mm, and the cold-rolled steel sheet was subjected to decarburization annealing and nitriding annealing.

[0158] [Table 1]

[0159]

[0160] Next, the cold-rolled steel sheet subjected to decarburization annealing and nitriding annealing was coated with an aqueous slurry of an annealing separator mainly composed of alumina, and final annealing was performed at 1200° C. for 20 hours to obtain no forsterite on the surface of the steel sheet. A grain-oriented electrical steel sheet with a stone-based coating, a mirror-like luster, and the completion of secondary recrystallizat...

Embodiment 2

[0178] The silicon steel slab with the composition shown in Table 1 was heated to 1100°C and subjected to hot rolling to prepare a hot-rolled steel sheet with a thickness of 2.6 mm, and the hot-rolled sheet was annealed at 1100°C, and then cooled once. It rolled to obtain a cold-rolled steel sheet with a final thickness of 0.23 mm, and the cold-rolled steel sheet was subjected to decarburization annealing and nitriding annealing.

[0179] Next, the cold-rolled steel sheet subjected to decarburization annealing and nitriding annealing was coated with an aqueous slurry of an annealing separator mainly composed of alumina, and final annealing was performed at 1200° C. for 20 hours to obtain no forsterite on the surface of the steel sheet. A grain-oriented electrical steel sheet with a stone-based coating, a mirror-like luster, and the completion of secondary recrystallization.

[0180] Formed from 25% nitrogen and 75% hydrogen, the partial pressure of oxygen (P H2O / P H2 ) in a...

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Abstract

This grain-oriented electrical steel sheet is characterized by having a base steel sheet, an amorphous oxide film formed on the base steel sheet, and a tension insulating film formed on the amorphous oxide film, the base steel sheet containing as the chemical composition thereof, in terms of % by mass, no more than 0.085% C, 0.80-7.00% Si, no more than 1.50% Mn, no more than 0.065% acid-soluble Al, no more than 0.013% S, 0-0.80% Cu, 0-0.012% N, 0-0.50% P, 0-1.00% Ni, 0-0.30% Sn, 0-0.30% Sb, the remainder comprising Fe and impurities, the surface glossiness Gs20(A) in the direction parallel to the rolling direction being 2.0-70, and the surface glossiness Gs20(B) in the direction perpendicular to the rolling direction being 2.0-70.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as a core material of a transformer, and particularly relates to a grain-oriented electrical steel sheet with a tensile insulating coating excellent in adhesion of a tensile insulating coating. [0002] This application claims priority based on Japanese Patent Application No. 2019-5396 filed in Japan on January 16, 2019 and Japanese Patent Application No. 2019-005475 filed in Japan on January 16, 2019, the contents of which are incorporated herein by reference. Background technique [0003] Grain-oriented electromagnetic steel sheets are mainly used in transformers. Transformers are continuously excited for a long period of time from when they are installed to when they are discarded, and energy loss occurs continuously. Therefore, the energy loss when magnetized by alternating current, that is, iron loss, is the main indicator that determines the performance of the transform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22C38/60H01F1/147C22C38/00C23C22/00
CPCC21D9/46C22C38/60C21D2201/05C21D6/008C21D8/1255C21D8/1272C21D8/1283C21D1/76C22C38/02C22C38/04H01F1/14791H01F1/18C23C22/74C23C22/08C22C38/004C22C38/06C22C38/008C22C38/08C22C38/16Y02P10/20C21D8/1222C23C22/00H01F1/147C22C38/12H01F1/14783C21D8/0257C21D8/1233C22C38/001C22C38/002
Inventor 高谷真介有田吉宏奥村俊介长野翔二
Owner NIPPON STEEL CORP
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