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Grain-oriented electrical steel sheet and manufacturing method thereof

An electromagnetic steel sheet and orientation technology, applied in the direction of manufacturing tools, circuits, electrical components, etc., can solve the problems of insulation degradation, insulation coating damage, etc., and achieve low energy loss, excellent iron loss characteristics, and excellent space factor Effect

Active Publication Date: 2019-05-21
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the non-heat-resistant magnetic domain refinement method, which introduces linear thermal strain on the surface of steel sheets by laser irradiation, there is a problem that the insulating coating around the heat-affected zone is widely damaged, so that the steel sheets are laminated. Insulation performance deteriorates significantly when used

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] A steel containing C: 0.065%, Si: 3.4%, and Mn: 0.08% was melted and cast into billets by continuous casting. Next, after heating to 1410°C, it is hot-rolled into a hot-rolled sheet with a thickness of 2.4mm. After annealing the hot-rolled sheet at 1050°C for 60 seconds, it is cold-rolled once to make the intermediate sheet thickness 1.8mm. After performing intermediate annealing for 80 seconds, it was made into the cold-rolled sheet whose final sheet|seat thickness was 0.23 mm by 200 degreeC warm rolling. Next, in the oxidatively wet H 2 -N 2 Decarburization annealing which doubles as primary recrystallization annealing was performed at 820° C. for 80 seconds in an atmosphere. Then, the surface of the steel plate is coated with MgO as the main body, and Cr is added in various changes within the range of 0 to 40%. 2 o 3 The annealing separation agent, after drying, implements secondary recrystallization annealing including changing the time spent heating between 950...

Embodiment 2

[0093] A steel containing C: 0.070%, Si: 3.2%, and Mn: 0.1% was melted and cast into billets by continuous casting. Next, after heating to 1410°C, it is hot-rolled into a hot-rolled sheet with a thickness of 2.4mm, and after annealing the hot-rolled sheet at 1050°C for 60 seconds, it is cold-rolled once to make the intermediate sheet thickness 1.9mm, and then rolled at 1120°C. After performing intermediate annealing for 80 seconds, it was made into the cold-rolled sheet whose final sheet|seat thickness was 0.23 mm by 200 degreeC warm rolling. Next, in the oxidatively wet H 2 -N 2 Decarburization annealing, which doubles as primary recrystallization annealing, was performed at 840° C. for 100 seconds in an atmosphere. Then, the surface of the steel plate is coated with MgO as the main body and 10% Cr 2 o 3 After the annealing separation agent was dried, final annealing was performed including secondary recrystallization annealing and purification treatment at 1200° C. for 7...

Embodiment 3

[0098] A steel containing C: 0.070%, Si: 3.2%, and Mn: 0.1% was melted and cast into billets by continuous casting. Next, after heating to 1410°C, it is hot-rolled into a hot-rolled sheet with a thickness of 2.4mm. After annealing the hot-rolled sheet at 1050°C for 60 seconds, it is cold-rolled once to make the intermediate sheet thickness 1.9mm. After performing intermediate annealing for 80 seconds, it was made into the cold-rolled sheet whose final sheet|seat thickness was 0.23 mm by 200 degreeC warm rolling. Next, in the atmosphere oxidation degree P(H 2 O) / P(H 2 ) = 0.40 oxidative humidity H 2 -N 2 The decarburization annealing which doubles as the primary recrystallization annealing was performed at 840 degreeC for 100 seconds in atmosphere. Then, the surface of the steel plate is coated with MgO as the main body and 10% Cr 2 o 3 After the annealing separation agent was dried, final annealing was performed including secondary recrystallization annealing and purific...

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Abstract

For a grain-oriented electrical steel sheet equipped with a ceramic base coating and an insulating coating, by setting the critical damage shear stress τ between the base coating and the steel base to be 50 MPa or more, it is possible to provide a magnetic The domain refining treatment does not damage the grain-oriented electrical steel sheet which is excellent in coating, insulation, space factor, and magnetic properties.

Description

technical field [0001] The present invention relates to a grain oriented electrical steel sheet in which iron loss is reduced by subjecting the surface to a magnetic domain refinement process based on thermal strain. Background technique [0002] Grain-oriented electrical steel sheets containing Si and whose crystal orientation is oriented in the (110)[001] orientation have excellent soft magnetic properties and are therefore widely used as raw materials for various iron cores in the commercial frequency domain. At this time, as the required characteristics, the loss when the magnetization is 1.7T at a frequency of 50 Hz, that is, W 17 / 50 The iron loss expressed in (W / kg) is important. The reason for this is due to: By using W 17 / 50 Raw materials with a low value can greatly reduce the no-load loss (energy loss) of the transformer core. This is why the development of raw materials with low iron loss is strongly demanded year by year. [0003] For grain-oriented electrica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/12C21D9/46C22C38/04C23C22/00H01F1/16
CPCC22C38/00C22C38/04C21D8/1255C21D8/1272C21D8/1283C22C38/02C21D3/04C21D6/005C21D6/008C21D8/005C21D8/1294H01F1/18C21D8/1222C21D8/1233C21D9/46H01F1/16C21D8/12C23C22/00B05D7/14C22C2202/02H01F27/245
Inventor 上坂正宪渡边诚高城重宏
Owner JFE STEEL CORP
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