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Grain-oriented electrical steel sheet for iron core and manufacturing method thereof

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, circuits, magnetic objects, etc., can solve the problem of material magnetic flux density becoming smaller, and achieve the effect of low iron loss and high energy efficiency

Active Publication Date: 2017-10-31
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this technology is applied to an iron core subjected to strain relief annealing, there is a problem that the magnetic flux density of the material is reduced by forming pits on the surface of the steel sheet similar to the groove forming technology shown in Patent Document 2 above.

Method used

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  • Grain-oriented electrical steel sheet for iron core and manufacturing method thereof
  • Grain-oriented electrical steel sheet for iron core and manufacturing method thereof
  • Grain-oriented electrical steel sheet for iron core and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0133] Manufactured by continuous casting Contains C: 0.05%, Si: 3.1%, Mn: 0.12%, Ni: 0.01%, O: 0.003%, N: 0.007%, Al: 0.025%, Se: 0.02% and S: 0.003%, and the steel slab composed of the remaining part of Fe and unavoidable impurities, and after being heated to 1430 ° C, hot-rolled into a hot-rolled sheet with a thickness of 1.6 mm, and then 1000 ° C at 1000 ° C. s of hot-rolled sheet annealing. Next, make the intermediate plate thickness 0.55mm by cold rolling, and 2 O / PH 2 =0.37, the temperature is 1100° C., and the time is 100 seconds, and the intermediate annealing is carried out. Then, after removing the auxiliary scale on the surface by hydrochloric acid pickling, cold rolling was performed again to obtain a cold-rolled sheet having a sheet thickness of 0.23 mm.

[0134] In the implementation of the above cold-rolled sheet at the oxidation degree PH 2 O / PH 2 =0.45, soaking temperature at 850° C. for 150 seconds after decarburization annealing, the cold-rolled sheet ...

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Abstract

According to the present invention, in the vicinity of the strain region, residual stress of 150 MPa or more exists within 300 μm with respect to the rolling direction and 42 μm or more with respect to the plate thickness direction, and at intervals of 2 to 10 mm in the rolling direction By periodically forming the above-mentioned strained regions, the transformer iron loss in the excitation region of 1.5 to 1.9 T is excellent, and a grain-oriented electrical steel sheet for iron core with less energy loss during transformer operation can be obtained.

Description

technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used as an iron core of a transformer and a method for manufacturing the same. Background technique [0002] In recent years, as the efficiency of energy use has been advanced, it is desired that the energy loss during the operation of the transformer be reduced. The loss generated in the transformer mainly includes the copper loss generated in the wire and the iron loss generated in the iron core. Furthermore, iron loss can be classified into hysteresis loss and eddy current loss, and it is known that improvement of crystal orientation of materials, reduction of impurities, and the like are effective in reducing hysteresis loss. [0003] For example, Patent Document 1 discloses a method of producing a grain-oriented electrical steel sheet excellent in magnetic flux density and iron loss by optimizing annealing conditions before final cold rolling. [0004] On the other hand, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B23K15/00C21D8/12H01F1/16C22C38/60
CPCC22C38/60H01F1/16C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C21D8/1283C21D8/1294C22C38/00C21D9/46C22C38/008C22C38/12C22C38/16C22C38/18C22C38/20C22C38/22C22C38/34C22C38/42C22C38/44B23K15/00C21D8/1277C21D1/34C21D6/001C21D6/002C21D6/004C21D6/005C21D6/008C21D8/1244H01F1/14775
Inventor 高城重宏山口广冈部诚司花泽和浩
Owner JFE STEEL CORP