Oriented electrical steel sheet and manufacturing method thereof

Abstract

Provided is an oriented electrical steel sheet according to one embodiment of the present invention, comprising by weight%: 0.01% or less (excluding 0%) or 0.01% to 0.1% of C; 2.0% to 4.0% of Si; 0.01% to 0.20% of Mn; 0.040% or less (excluding 0%) of acid soluble Al; 0.008% (excluding 0%) of N; 0.008% (excluding 0%) of S; 0.0001% to 0.008% of Se; 0.002% to 0.1% of Cu; 0.005% to 0.1% of Ni; 0.005% to 0.1% of Cr; 0.005% to 0.1% of P; and 0.005% to 0.20% of Sn, and comprising one or more of 0.0005% to 0.10% of Sb, 0.0005% to 0.10% of Ge, 0.0005% to 0.10% of As, 0.0001% to 0.10% of Pb, 0.0001% to 0.10% of Bi, and 0.001% to 0.1% of Mo, and the balance of Fe and other unavoidable impurities, wherein a magnetic flux density (B8) after a final secondary recrystallization is 1.92 Tesla or more.

Description

technical field [0001] The invention relates to a oriented electrical steel plate and a preparation method thereof. More specifically, it relates to a grain-oriented electrical steel sheet and a preparation method thereof that can further increase the magnetic flux density by controlling the composition of the steel sheet and controlling the rolling conditions during hot rolling to form a crystal orientation with excellent aggregation. Background technique [0002] Since grain-oriented electrical steel sheets are used as core materials for electronic products such as large rotating machines such as transformers and generators, in order to improve energy conversion efficiency by reducing power consumption of electronic equipment, a magnetic flux density of the core material is required Electrical steel sheet with high iron loss and excellent magnetic properties. [0003] Grain-oriented electrical steel sheet refers to the texture (also known as "Gaussian texture (Goss textur...

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Problems solved by technology

[0016] And this kind of heat treatment, along with the high-temperature heating to the steel billet, causes the energy cost to rise, and the steel billet washing (washing) phenomenon that the steel billet melts at a high temperature occurs, and edge cracks (edge ​​cracks) are generated during hot rolling, resulting in a decrease in yield, Can be considered a costly and inefficient preparation method

[0017] In addition, although high magnetic flux density characteristics can be ensured by adding Bi, most of the patents proposed in the past are directed at the surface and the unstable formation of secondary recrystallization caused by the main addition of Bi, and in order to overcome this Side effects, various improvement schemes are proposed for the process after hot rolling, but it is difficult to achieve stable production in the actual preparation process, requiring a lot of trial and error and exploration

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