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Non-oriented electrical steel sheet and manufacturing method therefor

A technology of grain-oriented electrical steel sheet and electrical steel sheet, applied in circuits, electrical components, manufacturing tools, etc., can solve the problems of long time, decreased productivity, and insignificant application results, and achieves the promotion of surface fine grains and improvement of iron loss. Effect

Active Publication Date: 2021-07-23
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that in order to control inclusions and fine precipitates, it is necessary to use high-grade raw materials in order to refine the content of impurity elements such as C, S, N, Ti, Nb, and V to extremely low in the steelmaking process. , and since the secondary refining takes a long time, the productivity drops
[0005] Therefore, methods of adding a large amount of resistivity elements such as Si, Al, and Mn and methods of controlling the content of impurity elements to be extremely low have been studied, but the results of practical application are not obvious

Method used

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  • Non-oriented electrical steel sheet and manufacturing method therefor
  • Non-oriented electrical steel sheet and manufacturing method therefor
  • Non-oriented electrical steel sheet and manufacturing method therefor

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preparation example Construction

[0087] The method for preparing a non-oriented electrical steel sheet according to an embodiment of the present invention includes: a step of preparing a steel slab, the steel slab, in weight %, contains Si: 2.5 to 3.8%, Al: 0.5 to 2.5%, Mn: 0.2 to 4.5% %, As: 0.0005 to 0.02%, Bi: 0.0005 to 0.01%, and the balance of Fe and unavoidable impurities; the step of heating the billet; the step of preparing a hot-rolled sheet by hot rolling the heated billet; A step of preparing a cold-rolled sheet by cold-rolling the hot-rolled sheet; and a step of preparing an electrical steel sheet by subjecting the cold-rolled sheet to final annealing. In the step of final annealing the cold-rolled sheet, the heating rate up to 700° C. may be 10° C. / s or more. The following is a detailed description of each step.

[0088]First, a billet satisfying the above composition is prepared. The reason for limiting the addition ratio of each composition in the slab is the same as the reason for limiting t...

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Abstract

The present invention relates to a non-oriented electrical steel sheet having reduced core losses at high frequencies and to a manufacturing method therefor. The non-oriented electrical steel sheet according to one embodiment of the present invention comprises 2.5-3.8 wt% of Si, 0.5-2.5 wt% of Al, 0.2-4.5 wt% of Mn, 0.0005-0.02 wt% of As, and 0.0005-0.01 wt% of Bi, with the remainder comprising Fe and unavoidable impurities, and satisfies formula (1) below. [Formula 1] 0.3 <= [surface fine-grain diameter] * [fine-grain formation thickness] * ([As] / [Bi]) <= 5.0, wherein [surface fine-grain diameter] represents the average diameter ([Mu]m) of fine grains at the outermost surface layer of the electrical steel sheet, [fine-grain formation thickness] represents the thickness (mm) of the outermost surface layer where the fine grains are formed, [As] represents the proportion (wt%) of As, and [Bi] represents the proportion (wt%) of Bi.

Description

technical field [0001] The invention relates to a non-oriented electrical steel plate and a preparation method thereof. More specifically, it relates to a non-oriented electrical steel sheet used as an iron core for a motor and a preparation method thereof, and relates to a non-oriented electrical steel sheet with low high-frequency iron loss and high magnetic flux density and a preparation method thereof. Background technique [0002] In order to improve global environmental issues such as energy saving, smog reduction, and greenhouse gas reduction, efficient use of electric energy has become a big issue. Since more than 50% of the total electric energy produced today is consumed by electric motors, it is necessary to increase the efficiency of electric motors in order to effectively use electric power. Recently, with the rapid development of the field of environmentally friendly vehicles (hybrid vehicles, plug-in hybrid vehicles, electric vehicles, fuel cell vehicles), at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/04C22C38/00C22C38/14C22C38/12C21D8/12H01F1/147
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/00C21D6/008C21D8/1272C21D9/46C22C38/004C22C38/002C22C38/001H01F1/14791H01F1/16C21D8/1222C21D8/1233C21D8/1244C21D6/005C21D2201/05C22C2202/02H01F1/147
Inventor 金载勋金龙洙申洙容
Owner 浦项股份有限公司
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