Directional magnetic steel plate and production 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 problems such as deterioration of iron loss characteristics, bending of steel sheets, discontinuity of beam irradiation area, etc. The effect of increasing the loss and excellent iron loss characteristics

Active Publication Date: 2017-02-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even if the initial state is well set, the steel plate bends and travels during the continuous irradiation of the steel plate, and the beam irradiation area is deviated due to aging of the optical system, etc. , sometimes dislocation of the beam irradiation area in the length direction and / or the width direction of the steel plate, so that the beam irradiation area becomes discontinuous
If such a discontinuity exists in the steel plate, it will lead to deterioration of iron loss characteristics

Method used

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  • Directional magnetic steel plate and production method therefor
  • Directional magnetic steel plate and production method therefor
  • Directional magnetic steel plate and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] A cold-rolled steel sheet containing Si: 3% by mass, with a final thickness of 0.23 mm and a width of 1250 mm, was subjected to primary recrystallization annealing that doubles as decarburization annealing, and then an annealing separator mainly composed of MgO was applied to the surface of the steel sheet. , implement final annealing including secondary recrystallization annealing and purification annealing, make grain-oriented electrical steel sheet with forsterite film, and then coat 60% by mass of insulating coating formed by colloidal silica and aluminum phosphate, implement Sintering was performed by planarizing annealing at a temperature of 800°C.

[0114] Next, the above-mentioned steel plate is irradiated continuously in a line with laser light in a direction at right angles to the rolling direction by using 4 fiber lasers installed in the width direction of the steel plate, or irradiated by 8 electron beams installed in the width direction of the steel plate T...

Embodiment 2

[0123] Using 6 electron beam irradiation devices installed in the width direction of the steel sheet, electron beams were irradiated to the grain-oriented electrical steel sheet with a final sheet thickness of 0.23 mm x a sheet width of 1250 mm and a coil length of 5000 m after forming an insulating film to perform magnetic domain refinement. treatment. At this time, the target β value was changed so that the TD interval β of the seam of the beam irradiation region was -5 mm, -3 mm, 0 mm, and 3 mm, and the electron beam was irradiated in such a manner.

[0124] Then, a total of 51 test pieces were collected from the product coil every 100m, and the TD interval β of the seam in the beam irradiation area was measured, and the maximum and minimum values ​​of the TD interval β of the 51 samples measured were shown in Table 2. From the results, it can be seen that by setting the target value of the TD interval β at -3 to 0 mm and performing beam irradiation, the range of the TD in...

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Abstract

The invention relates to a directional magnetic steel plate with excellent iron loss characteristic and a production method therefor with good productivity. The surface of a steel plate is divided into a plurality of regions in the plate widthwise direction, a laser irradiation device or electron beam irradiation device is stationed in each of the respective regions, and beam-irradiated regions are formed by irradiation with a beam, to carry out a magnetic domain refinement process, during which process the TD spacing (beta) at the junctures of the beam-irradiated regions is set to within the range -3 to 0 mm, and irradiation with the beam is carried out such that the properties of junctures of beam-irradiated regions satisfy the conditions shown in the description, thereby producing a directional magnetic steel plate having exceptional iron loss characteristics, at good productivity. Here, alpha: RD spacing at junctures of beam-irradiated regions (mm); beta: TD spacing at junctures of beam-irradiated regions (mm); a: beam spacing (mm); w: average width of magnetic domain discontinuities ([mu]m).

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet and a method for producing the same. Specifically, it relates to a grain-oriented electrical steel sheet that has been subjected to magnetic domain refining treatment and has excellent iron loss characteristics, and a method for manufacturing the same. Background technique [0002] Grain-oriented electrical steel sheets are mainly used as core materials for transformers and electric motor cores, and therefore excellent magnetic properties, especially excellent iron loss properties (low iron loss) are strongly required. In order to improve iron loss characteristics, it is an effective method to highly concentrate the secondary recrystallized grains in the product steel plate in the {110}<001> orientation (the so-called "Gaussian orientation") and reduce impurities. [0003] However, the effect of improving iron loss by controlling crystal orientation and reducing impurities a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12B23K15/00C22C38/00H01F1/16C22C38/60
CPCC22C38/00C22C38/60H01F1/16C22C38/02B23K15/0006B23K26/0006B23K2103/50B23K2101/18B23K2103/04C21D8/1294B23K26/352C22C38/008C22C38/04C22C38/42C22C38/44
Inventor 井上博贵高城重宏冈部诚司
Owner JFE STEEL CORP
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