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Manufacturing method for unidirectional electromagnetic steel sheet

An electromagnetic steel sheet and manufacturing method technology, applied in the direction of the magnetism of inorganic materials, can solve the problems of deviation in the length direction and width direction of the glass film or insulating film, and achieve the effect of suppressing defects and high quality

Active Publication Date: 2014-02-05
NIPPON STEEL CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, since grain-oriented electrical steel sheets are subjected to many heat treatments, the interface structure and thickness of the glass film or insulating film may vary in the longitudinal direction (rolling direction) and width direction of the steel sheet base metal.
Therefore, even if the laser irradiation conditions are adjusted, it may be difficult to reliably suppress the occurrence of flaws on the glass film on the entire steel sheet base metal.

Method used

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  • Manufacturing method for unidirectional electromagnetic steel sheet
  • Manufacturing method for unidirectional electromagnetic steel sheet
  • Manufacturing method for unidirectional electromagnetic steel sheet

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Experimental program
Comparison scheme
Effect test

Embodiment

[0057] Next, a confirmation experiment carried out to confirm the effects of the present invention will be described.

[0058] First, prepare a slab having the following composition: 3.0% by mass of Si, 0.05% by mass of C, 0.1% by mass of Mn, 0.02% by mass of acid-soluble Al, 0.01% by mass of N, and 0.01% by mass of S , P is 0.02% by mass, and the remainder contains Fe and unavoidable impurities.

[0059] This slab was hot-rolled at 1280° C. to produce a hot-rolled material with a thickness of 2.3 mm.

[0060] Next, the hot-rolled material was heat-treated under the condition of 1000° C.×1 minute. Pickling treatment was performed after the heat treatment, and cold rolling was performed to produce a cold-rolled material with a thickness of 0.23 mm.

[0061] This cold-rolled material was subjected to decarburization annealing under the conditions of 800° C.×2 minutes. Next, an annealing separation material mainly composed of magnesium oxide was coated on both surfaces of the ...

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Abstract

The present invention has the following steps: a final annealing step (S07) for annealing in a batch furnace a steel sheet (ferrite) wound into a coil, and forming a glass coating on the surface of the steel sheet (ferrite); an insulating film forming step (S08) for, after the final annealing step (S07), forming an insulating film on top of the glass coating; and a laser irradiation step (S09) for irradiating the insulating film from above with a laser beam, and for controlling the magnetic domain. In the laser irradiation step (S09), a laser beam is shone onto a surface facing the radial exterior side of the coil at the time of the final annealing step (S07).

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet in which a glass film and an insulating film are formed on the surface of a steel sheet base metal and magnetic domains are controlled by irradiation with laser light. Background technique [0002] The aforementioned grain-oriented electrical steel sheets are being used as raw materials for iron cores constituting electrical equipment such as transformers and rotary machines. In such a grain-oriented electrical steel sheet, it is necessary to reduce energy loss (iron loss) during magnetization. Iron loss is classified into eddy current loss and hysteresis loss. Furthermore, eddy current loss is classified into classical eddy current loss and abnormal eddy current loss. [0003] Here, in order to reduce classical eddy current loss, a grain-oriented electrical steel sheet having a thin thickness with an insulating film formed on the surface of the sheet is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12H01F1/16C22C38/00C22C38/06
CPCC21D8/1255C21D8/1272C22C38/06C22C38/02C21D8/1222C21D8/1283H01F1/18C22C38/04C21D8/1294C22C38/001C21D8/1233
Inventor 坂井辰彦滨村秀行
Owner NIPPON STEEL CORP
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