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Method for preparing non-oriented electrical steel for high-efficient motor via twin roll strip casting

A technology of twin-roll thin strip continuous casting and oriented electrical steel, which is applied in the field of metallurgy and can solve the problems of low magnetic induction of finished products, limited improvement of magnetic induction, and insufficient efficiency.

Inactive Publication Date: 2014-03-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in order to achieve the goal of energy saving and emission reduction, European and American countries have comprehensively raised the motor efficiency standards, and gradually adopted high-efficiency motors to eliminate low-efficiency motors (the average efficiency is less than 87%)
The factor affecting the iron loss is the grain size. By adding elements such as Sn and P, the ultra-purified molten steel can promote the growth of annealed recrystallized grains, thereby reducing the iron loss; and improving the magnetic induction can only be achieved by improving the texture. This is exactly the difficulty that traditional crafts cannot overcome
In the traditional process, since the preparation of silicon steel starts from continuous casting, after the slab is hot-rolled with a large compression ratio (>95%), the texture type is very uniform, with α texture (∥RD) and γ texture (∥ND), after more than 80% cold rolling reduction and recrystallization annealing, the γ texture that is unfavorable to magnetic properties dominates, so the magnetic induction of the finished product is not high
The above-mentioned patents generally improve the texture by increasing the finishing temperature of hot rolling, adding grain boundary segregation elements such as Sn and P, and normalizing the hot-rolled strip, which can weaken the γ texture, but it has not changed fundamentally. The gamma texture dominates the problem, so the magnetic induction is limited

Method used

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  • Method for preparing non-oriented electrical steel for high-efficient motor via twin roll strip casting
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  • Method for preparing non-oriented electrical steel for high-efficient motor via twin roll strip casting

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Embodiment 1

[0030] A method for preparing non-oriented electrical steel for high-efficiency motors by twin-roll strip continuous casting, such as figure 1 shown, follow the steps below:

[0031](1) According to the mass percentage of chemical composition: 0.0034%C, 1.31%Si, 0.32%Mn, 0.25%Al, and limit 0.0043%O, 0.005%S, 0.0045%N, the rest is Fe smelting molten steel;

[0032] (2) Control the pouring temperature at 1540°C, pour the molten steel into the rotating steel roll through the tundish, and quickly solidify and form it to obtain a cast strip with a thickness of 2.5mm and a coarse and uniform structure. The metallographic structure of the cast strip is as follows: figure 2 As shown in (a), the grain size is 98 μm, and the grain orientation is as image 3 As shown in (a), the {100} component in the crystal orientation of the cast strip is significantly increased;

[0033] (3) Cool the cast strip, control the initial cooling temperature at 1308°C, and the final cooling temperat...

Embodiment 2

[0036] A method for preparing non-oriented electrical steel for high-efficiency motors by twin-roll strip continuous casting, such as figure 1 As shown, follow the following steps: (1) According to the mass percentage of chemical composition: 0.0031%C, 1.30%Si, 0.33%Mn, 0.27%Al, and limit 0.0042%O, 0.005%S, 0.0041%N, the rest is Fe molten steel;

[0037] (2) Control the pouring temperature at 1560°C, pour the molten steel into the rotating steel roll through the tundish, and quickly solidify and form it to obtain a cast strip with a thickness of 2.5mm and a coarse and uniform structure. The metallographic structure of the cast strip is as follows: figure 2 As shown in (b), the grain size is 160 μm, and the grain orientation is as image 3 As shown in (b), the {100} component in the crystal orientation of the cast strip is significantly increased;

[0038] (3) Cool the cast strip, control the initial cooling temperature at 1315°C, and the final cooling temperature at 960°C, ...

Embodiment 3

[0041] A method for preparing non-oriented electrical steel for high-efficiency motors by twin-roll strip continuous casting, such as figure 1 As shown, follow the following steps: (1) According to the mass percentage of chemical composition: 0.0035%C, 1.32%Si, 0.30%Mn, 0.24%Al, and limit 0.0046%O, 0.0039%S, 0.0041%N, the rest is Fe molten steel;

[0042] (2) Control the pouring temperature at 1580°C, pour the molten steel into the rotating steel roll through the tundish, and quickly solidify and form it to obtain a cast strip with a thickness of 2.5mm and a coarse and uniform structure. The metallographic structure of the cast strip is as follows: figure 2 As shown in (c), the grain size is 380 μm, and the grain orientation is as image 3 As shown in (c), the {100} component in the crystal orientation of the cast strip is significantly increased;

[0043] (3) Cool the cast strip, control the initial cooling temperature to 1320°C, and the final cooling temperature to 980°C,...

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Abstract

The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing non-oriented electrical steel for a high-efficient motor via twin roll strip casting. The method comprises the following steps: firstly, smelting molten steel according to components; then controlling a pouring temperature within 1600 DEG C to 1540 DEG C; pouring the molten steel into a rotating steel roller through a tundish; rapidly solidifying and molding so as to obtain a casting strip; cooling the casting strip; rolling the casting strip at 500 DEG C to 700 DEG C; performing acid pickling on the casting strip; and then performing cold rolling and annealing on the casting strip, thereby obtaining the non-oriented electrical steel for the high-efficient motor. The crystallite grain dimensions and the structural components of the casting strip are controlled by virtue of the special advantages of a casting-rolling process, so that the crystallite grain dimensions and the favorable structural components of an annealing plate are fully improved. As a result, the magnetic property of the non-oriented electrical steel is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing non-oriented electrical steel for high-efficiency motors by twin-roll strip continuous casting. Background technique [0002] High-efficiency motors refer to high-standard motors with an average efficiency of over 90%. In recent years, in order to achieve the goal of energy saving and emission reduction, European and American countries have comprehensively raised the motor efficiency standards, and gradually adopted high-efficiency motors to eliminate low-efficiency motors (the average efficiency is less than 87%). my country also launched a new standard for motor efficiency in 2011, with the aim of increasing the usage of high-efficiency motors and achieving the goal of saving energy and reducing consumption. Non-oriented silicon steel sheets are used for the iron core of the stator and rotor of the motor. The use of low iron loss and high ...

Claims

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Application Information

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IPC IPC(8): C22C38/06B22D11/06C21D8/12
Inventor 许云波张元祥王洋曹光明李成刚刘振宇方烽卢翔王国栋
Owner NORTHEASTERN UNIV
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