Electrical steel sheet and manufacturing method therefor

A technology of electrical steel sheet and manufacturing method, applied in the direction of manufacturing tools, circuits, electrical components, etc., can solve the problems of low bonding force, poor adhesion between the steel sheet and insulating coating, and the insulating coating cannot be uniformly formed, etc., and achieves improvement. Adhesion, Oxygen Oxidation Prevention, Effect of Improving Insulation Properties

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

AI Technical Summary

Problems solved by technology

[0007] However, there is a large amount of Fe on the surface of the steel plate after pickling, and the binding force between the surface of the steel plate and the OH and O functional groups is not strong.
When an insulating coating containing oxides composed of O and OH components is formed on such a surface, there will be problems that the insulating coating cannot be formed uniformly and that the adhesion between the steel plate and the insulating coating is poor.

Method used

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  • Electrical steel sheet and manufacturing method therefor
  • Electrical steel sheet and manufacturing method therefor
  • Electrical steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] A slab was prepared which contained 3.4% by weight of silicon (Si) and the balance consisted of Fe and other unavoidable impurities.

[0085] The slab was heated at 1130° C. and then hot rolled to a thickness of 2.3 mm to manufacture a hot rolled sheet.

[0086] Use a shot blaster (Shot Blaster) to leave an oxide skin layer with a thickness of about 100nm on the hot-rolled sheet, and control the injection amount of fine particles to about 650g / m 3 , the injection speed is controlled to about 50km / s. Then, the hot-rolled sheet was passed between blades coated with rubber having an elasticity of about 30 MPa to control the surface roughness to about 1.5 nm. Subsequently, pickling treatment was carried out by immersing for about 50 seconds in a hydrochloric acid solution (about 15% by weight) at a temperature of about 70°C. Then, perform cleaning.

[0087] figure 2 A scanning electron microscope (SEM) picture of a cross-section of a steel plate after pickling is shown i...

experiment example 1

[0105] Experimental example 1: confirmation of rust

[0106] After the pickling and cleaning of the hot-rolled sheets in Examples and Comparative Examples, the hot-rolled sheets were coiled and placed for the time shown in Table 1 below before cold rolling.

[0107] Gloss was measured at 2 points and is shown in Table 1 below. The light intensity when the reflected light is received at the same angle as the incident light is measured using an ASTM D 523 gloss meter, and the gloss is represented by the ratio when the gloss of the glass surface with a refractive index of 1.567 is 100. At this time, the angle is set to 60°.

[0108] 【Table 1】

[0109]

[0110] As shown in Table 1, the examples in which the scale layer was present after washing had lower glossiness than the comparative examples. However, after 1 day and 2 days, the rust was prevented by the scale layer in the examples, but the rust was formed in the comparative example, and the gloss was significantly lowere...

experiment example 2

[0111] Experimental Example 2: Measuring Insulation

[0112] After finishing annealing in Examples and Comparative Examples, the insulation properties of the steel sheets were measured at three points, and are shown in Table 2 below. In addition, after forming an insulating coating layer with a thickness of 1 μm, the insulating properties were measured and shown in Table 2 below. The insulation properties were measured with a Franklin tester in accordance with the ASTM A717 international standard.

[0113] In addition, for adhesion, it is judged by whether the film layer is peeled off when the sample is bent to 180°. When observed with a microscope at x100, it is considered very good if there is no peeling, and it is considered good if there are 3 or less defects (defect) / 5cmx5cm at x100.

[0114] Iron loss (W 15 / 50 ) refers to the power loss generated when a magnetic field with a frequency of 50 Hz is magnetized by alternating current to 1.5 Tesla.

[0115] 【Table 2】

[...

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Abstract

A method for manufacturing an electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: manufacturing a hot rolled sheet by hot rolling a slab; removing some scales formed on the hot rolled sheet, and leaving a scale layer having a thickness of 10 nm or more; controlling the roughness of the hot rolled sheet on which the scale layer remains; cold rolling same so as to manufacture a cold rolled sheet; and annealing the cold rolled sheet.

Description

technical field [0001] The invention relates to an electrical steel plate and a manufacturing method thereof. More specifically, the present invention relates to an electrical steel sheet and a method for producing the same, in which insulating properties and adhesion to an insulating coating are improved by leaving a part of scale existing on the surface of the hot-rolled sheet after manufacturing the hot-rolled sheet. Background technique [0002] Electrical steel sheets are products used as materials for transformers, motors, and electrical equipment. Unlike ordinary carbon steel, which emphasizes workability such as mechanical properties, electrical steel sheets are functional products that emphasize electrical properties. The required electrical characteristics are low iron loss, high magnetic flux density, high magnetic permeability and high duty cycle. [0003] Electrical steel sheets are divided into oriented electrical steel sheets and non-oriented electrical steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/00C22C38/14C21D8/12H01F1/147B24C1/08
CPCC21D8/12C22C38/02C22C38/04C22C38/06C22C38/14B24C1/086C22C38/34C21D8/1277C21D2201/05C23C8/18H01F1/14783C21D8/1222C21D8/1233C21D8/1272C21D7/06C21D9/46C21D8/1255C21D8/1283C21D6/008C22C38/001C21D8/1244H01F1/14766C22C2202/02C21D8/0205C21D8/0226C21D8/0236C22C38/28
Inventor 金泫贞
Owner 浦项股份有限公司
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