Non-oriented electrical steel sheet excellent in magnetic permeability and method for manufacturing the same

Abstract

The invention relates to a non-oriented electrical steel sheet and a method for manufacturing the same, and more concretely relates to a non-oriented electrical steel sheet that includes 1.5-4.0 wt% Si, 0.01-0.50 wt% Mn, 0.0005-0.02 et% Al, 0.001-0.15 wt% P, less than 0.004 wt% (except 0 wt%) C, 0.0001-0.01 wt% S, less than 0.003 wt% (except 0 wt%) N, less than 0.003 wt% (except 0 wt%) Ti, 0.01-0.15 wt% Sn, less than 0.15 wt% Sb, and the balance F and other inevitable foreign matters. The Al, Sn, Sb and P in the sheet satisfies the relation: [Al]<[Sn]+[Sb] and [Al]<[Sn]+[P], wherein [Al], [Sn], [Sb] and [P] respectively represent contents of Al, Sn, Sb and P by means of wt%.

Description

technical field

[0001] The invention relates to a non-oriented electrical steel sheet and a manufacturing method thereof. Background technique

[0002] Non-oriented electrical steel sheets play an important role in the energy efficiency of electrical equipment because non-oriented electrical steel sheets are used as core materials for rotating machines such as motors and generators and stationary machines such as small transformers to convert electrical energy into mechanical energy.

[0003] The magnetic properties of non-oriented electrical steel sheets are, for example, iron loss and magnetic flux density. Iron loss refers to energy loss during magnetization, so the lower the iron loss, the better. In addition, the magnetic flux density is evaluated by the magnetic flux density value (unit: T) obtained under a specific magnetizing force, and the magnetic flux density value is divided by the specific magnetizing force (unit: A / m) and the vacuum permeability μ0=4π* A value...

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