Grain-oriented electrical steel sheet and manufacturing method thereof

An electromagnetic steel plate and manufacturing method technology, applied in the direction of manufacturing tools, inorganic material magnetism, electron beam welding equipment, etc., can solve problems such as deterioration of iron loss characteristics, bending of steel plates, discontinuous beam irradiation area, etc., and achieve iron loss Excellent properties and the effect of suppressing the increase of iron loss

Active Publication Date: 2018-12-14
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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  • 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

[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 present invention relates to a grain-oriented electrical steel sheet excellent in iron loss characteristics, and a manufacturing method capable of producing the grain-oriented electrical steel sheet with good productivity. A laser irradiating device or an electron beam irradiating device irradiates a beam to form a beam irradiated area, thereby performing magnetic domain refinement treatment. At this time, the TD interval β of the seam of the above-mentioned beam irradiated area is set It is in the range of -3~0mm, and the properties of the joints in the above-mentioned beam irradiation area satisfy "0≤α≤0.3×a" and "-1.2×a+0.02×w-0.5×α-6.5≤β≤ ‑0.13×a‑200×(1 / w)+5.4” to irradiate the beam. In the above formula, α: RD interval (mm) of the joints in the beam irradiation area, β: TD interval (mm) of the joints in the beam irradiation area, a: beamline interval (mm), w: Magnetic domain discontinuity average width (μm).

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 Patents(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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