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Oriented electromagnetic steel plate and manufacturing method thereof

A technology of electromagnetic steel sheet and manufacturing method, applied in the direction of manufacturing tools, inorganic material magnetism, furnace type, etc., can solve the problems of not being able to obtain low iron loss, unable to improve magnetic properties, etc., and achieve the effect of low iron loss

Active Publication Date: 2017-11-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if at least one of Sb, Sn, Mo, Cu, and P, which is a grain boundary segregation element, is added in order to improve magnetic properties, there is obviously a problem that the magnetic properties cannot be actually improved and low iron loss cannot be obtained.

Method used

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  • Oriented electromagnetic steel plate and manufacturing method thereof
  • Oriented electromagnetic steel plate and manufacturing method thereof
  • Oriented electromagnetic steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Steel slabs are manufactured by continuous casting and heated at 1220°C, and the slabs contain C: 0.032%, Si: 3.25%, Mn: 0.06%, N: 0.0026%, sol.Al: 0.0095%, Sn: 0.120%, P: 0.029%. Then, this steel slab was hot-rolled, and it finished-rolled it into the hot-rolled plate of 2.7 mm in thickness. Subsequently, the hot-rolled sheet was subjected to hot-rolled sheet annealing at 1025° C. for 30 seconds, and then finished cold-rolled into a cold-rolled sheet having a sheet thickness of 0.23 mm. Then, at 55% H 2 -45%N 2 , Under a humid gas atmosphere with a dew point of 58° C., the cold-rolled sheet was subjected to primary recrystallization annealing at 840° C. for 100 seconds as decarburization annealing to obtain a primary recrystallization sheet. Then, an annealing separator mainly composed of MgO is coated on the surface of the primary recrystallization plate, and the2 The final annealing for secondary recrystallization was carried out in a gas atmosphere for 5 hours to...

Embodiment 2

[0098] Various slabs containing the components described in Table 2 were produced by continuous casting, and the slabs were heated at 1380°C. Then, these slabs were hot-rolled and finished into hot-rolled sheets with a thickness of 2.5 mm. Subsequently, the hot-rolled sheet was subjected to hot-rolled sheet annealing at 950° C. for 30 seconds, and then cold-rolled so as to have a sheet thickness of 1.7 mm. Then, intermediate annealing was performed at 1100° C. for 30 seconds, followed by finish rolling by warm rolling at 100° C. to form a cold-rolled sheet having a thickness of 0.23 mm. Then, at 60% H 2 -40%N 2 1. In a humid gas atmosphere with a dew point of 64° C., the cold-rolled sheet was subjected to primary recrystallization annealing at 850° C. for 100 seconds as decarburization annealing to obtain a primary recrystallization sheet. Then, an annealing separator mainly composed of MgO is coated on the surface of the primary recrystallization plate, and the 2 Final an...

Embodiment 3

[0104] Steel slabs were produced by continuous casting and heated at 1220°C, the slabs contained C: 0.058%, Si: 3.68%, Mn: 0.34%, N: 0.0011%, sol.Al: 0.0023% by mass % , Sb: 0.090%, P: 0.077%. Then, this steel slab was subjected to hot rolling, and was finished rolled into a hot-rolled sheet having a thickness of 2.0 mm. Subsequently, the hot-rolled sheet was subjected to hot-rolled sheet annealing at 1060° C. for 100 seconds, and then cold-rolled to finish rolling into a cold-rolled sheet having a sheet thickness of 0.23 mm. Then, at 55% H 2 -45%N 2 1. Under a humid gas atmosphere with a dew point of 60°C, the cold-rolled sheet was subjected to primary recrystallization annealing at 840°C for 100 seconds as decarburization annealing to obtain a primary recrystallization sheet. Then, an annealing separator mainly composed of MgO is coated on the surface of the primary recrystallization plate, and the 2 The final annealing for secondary recrystallization was carried out in ...

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Abstract

An oriented electromagnetic steel plate, and a manufacturing method thereof, is provided which has low core loss even in the case of containing at least one of Sb, Sn, Mo, Cu and P, which are grain boundary segregation elements. In this method of manufacturing an oriented electromagnetic steel plate, defining T(hr) as the time needed after finish annealing for the temperature of the secondary recrystallization plate to fall from 800 to 400DEG C, the line tension Pr (MPa) on the secondary recrystallization plate is controlled so as to satisfy Pr <=-0.075T + 18 (here, T > 10, 5 < Pr) in a flattening annealing step. As a result, it is possible to obtain an oriented electromagnetic steel plate which has low core loss and which has a dislocation density near the crystal grain barrier of the base metal of less than or equal to 1.0*1013m-2 even in the case of containing at least one of Sb, Sn, Mo, Cu and P.

Description

technical field [0001] The invention relates to a low iron loss grain-oriented electrical steel sheet suitable for a transformer core material and a manufacturing method thereof. Background technique [0002] Grain-oriented electrical steel sheets are soft magnetic materials that can be used as iron core materials for transformers and generators, and have a crystal structure in which the <001> orientation of the easy magnetization axis of iron is concentrated in the rolling direction of the steel sheet. Such a crystal structure is obtained by preferentially enlarging grains in the {110}<001> orientation called the so-called Goss (Goss) orientation during the final annealing for secondary recrystallization in the production process of grain-oriented electrical steel sheets. grow to form. [0003] As a common technique for this grain-oriented electrical steel sheet, a method of secondary recrystallization of crystal grains having a Goss orientation during final an...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/12C22C38/60
CPCC21D8/12C21D9/46H01F1/16C21D6/008C21D8/1244C21D8/125C21D8/1272C21D8/1277C22C38/008C22C38/02C22C38/04C22C38/12C22C38/16C22C38/18C21D8/1288C21D1/78C21D1/84C21D6/001C21D6/002C21D6/004C21D6/005C22C38/08C22C38/20C22C38/22C22C38/34C22C38/60C21D2201/05C21D8/1222C21D8/1283C22C38/06C21D8/1266
Inventor 今村猛竹中雅纪胁阪有衣子
Owner JFE STEEL CORP
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