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Grain-oriented electrical steel sheet and manufacturing method thereof

An electromagnetic steel plate and manufacturing method technology, applied in the direction of the magnetism of inorganic materials, can solve the problems of increased hysteresis loss, increased hysteresis loss, and obstruction of magnetic wall movement, etc., and achieve the effect of high energy use efficiency and low iron loss

Active Publication Date: 2016-11-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, it is known that if irradiated with high-energy beams such as plasma flames, lasers, and electron beams, although the magnetic domains are subdivided and the eddy current loss is reduced, on the other hand, the hysteresis loss is increased.
[0012] For example, in Patent Document 5, it is reported that a hardened (hardened) region generated on a steel sheet by laser irradiation etc. prevents the movement of the magnetic wall and increases the hysteresis loss

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

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Embodiment 1

[0102] In this embodiment, the sample irradiated with electron beam and laser is B in the rolling direction measured by SST (Single Plate Magnetic Tester) 8 From 1.91T to 1.95T, the iron loss W measured with a model transformer 17 / 50 It is 1.01 to 1.03W / kg, and coated grain-oriented electrical steel sheet. The coated steel sheet has a structure in which Mg is present on the surface of the steel substrate 2 SiO 4 A glass-like coating film as the main component and a two-layer coating film of a coating film (phosphate-based coating layer) sintered with an inorganic treatment liquid on it.

[0103] During electron beam and laser irradiation, scanning is performed linearly across the entire width direction of the steel sheet in the rolling direction at right angles to the steel sheet, and at periodic intervals of 5 mm in the rolling direction. Here, laser irradiation is performed using a continuous-oscillation fiber laser device, and near-infrared light with a laser wavelength of abou...

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Abstract

A grain-oriented electrical steel sheet that has extremely low iron loss and noise when used for iron cores of transformers, has high energy utilization efficiency, and enables the manufacture of transformers that can be used in various environments. The present invention relates to the strain distribution on the rolling direction section of the region where closed magnetic domains are formed, so that the maximum tensile strain in the plate thickness direction is 0.45% or less, and the maximum tensile strain t (%) and the maximum The compressive strain c (%) is such that it satisfies the relationship of the following formula (1), t+0.06≤t+c≤0.35 (1).

Description

Technical field [0001] The present invention relates to a grain-oriented electrical steel sheet and a manufacturing method thereof. The grain-oriented electrical steel sheet is used for applications such as iron cores of transformers, and in particular, can simultaneously improve iron loss and noise. Background technique [0002] In recent years, against the background of efficient use of energy, transformer manufacturers have sought electromagnetic steel plates with high magnetic flux density and low iron loss. [0003] By concentrating the crystal orientation of the steel sheet toward the Goss orientation, the magnetic flux density can be increased. For example, Patent Document 1 discloses a magnetic flux density B exceeding 1.97T 8 The manufacturing method of grain-oriented electrical steel sheet. [0004] On the other hand, iron loss can be improved by high purity of the raw material, high orientation, reduction in plate thickness, addition of Si, Al, and magnetic domain subdivis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/12C22C38/60H01F1/16
Inventor 高城重宏末广龙一山口广
Owner JFE STEEL CORP