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

A technology of oriented electrical steel sheet and its manufacturing method, which is applied in the field of non-oriented electrical steel sheet and its manufacturing, can solve the problems of magnetic reduction of fine precipitates and increase of manufacturing cost, and achieve the effect of improving magnetic permeability and reducing iron loss

Active Publication Date: 2015-06-03
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

However, these techniques all lead to an increase in manufacturing costs, and cannot solve the problem of a decrease in magnetic properties caused by the formation of fine precipitates

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Example 1: Manufacture of non-oriented electrical steel sheet

[0099] A slab composed of the composition shown in Table 1 below was heated at 1150°C and hot-rolled to a thickness of 2.5 mm, and then coiled at 650°C. For the hot-rolled sheet cooled in air, it is annealed at 1080°C for 3 minutes, pickled and then cold-rolled to a thickness of 0.35mm. The annealing of the cold-rolled sheet is final annealed at 1050°C for 1 minute.

[0100] 【Table 1】

[0101]

[0102] In the above Table 1, the unit of component content is wt%.

[0103] Evaluation Example 1: Iron loss and magnetic flux density of Example 1

[0104] For each test piece, take 5 or more test pieces, and measure the iron loss W by using a single-plate magnetic measuring instrument as follows 15 / 50 and magnetic flux density B 1 、B 10 、B 50 , and the results are shown in Table 2 below.

[0105] 1) Iron loss (W 15 / 50 ) represents the average loss (W / kg) in the rolling direction and the direction per...

Embodiment 2

[0116] Embodiment 2: Manufacture of non-oriented electrical steel sheet

[0117] Slabs (slabs) having compositions shown in Table 3 below were heated at 1150°C and hot-rolled to a thickness of 2.5 mm, and then coiled at 650°C. The hot-rolled sheet cooled in air was annealed at 1100°C for 3 minutes, pickled, cold-rolled to a thickness of 0.35 mm, and finally annealed at 1050°C for 1 minute to produce a non-oriented electrical steel sheet.

[0118] Among them, the temperature increase condition in the hot-rolled sheet annealing step is to change the temperature increase rate to 16°C / s for 700°C or less and 13°C / s for 700°C or more. In addition, the temperature increase condition in the cold-rolled sheet annealing step is to change the temperature increase rate to 20°C / s for 700°C or lower, and 15°C / s for 700°C or higher.

[0119] 【table 3】

[0120]

[0121]

[0122] In the above-mentioned Table 3, the content units of Si, Mn, P, Al, Sn and Sb are wt%. In addition, the c...

Embodiment 3

[0134] Embodiment 3: Manufacture of non-oriented electrical steel sheet

[0135] The non-oriented electrical steel sheet was made from the slab containing the components of the inventive example 6, and the annealing conditions of the hot-rolled sheet and the cold-rolled sheet were changed to the following Table 5.

[0136] The hot-rolled sheet annealing and cold-rolled sheet annealing conditions in the inventive examples 8 to 10 and comparative examples 9 to 12 are shown in Table 5 below. Furthermore, for the non-oriented electrical steel sheets produced by the respective production methods, the magnetic permeability of μ10 and μ15 were measured by the following method, and the results are shown in Table 5 below.

[0137] 1) Magnetic permeability (μ10, μ15) means the average magnetic permeability in the rolling direction and the direction perpendicular to the rolling direction when magnetic flux densities of 1.0 Tesla and 1.5 Tesla are respectively excited at a frequency of 50...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/14C22C38/50C21D8/12
Inventor 李世日朴峻秀裴秉根
Owner 浦项股份有限公司
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