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Non-oriented electrical steel and preparation method thereof

A technology of oriented electrical steel and orientation, which is applied in the field of electrical steel, can solve problems such as the inability to produce high-efficiency non-oriented electrical steel, and achieve the effects of easy organization and implementation, simple process flow, and increased size

Active Publication Date: 2022-04-29
河北敬业高品钢科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method coils the hot-rolled sheet with a Si content of less than 2% at a coiling temperature of 540-600°C, does not use the normalization process of the hot-rolled sheet, and cannot finally produce high-efficiency non-oriented electrical steel.

Method used

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  • Non-oriented electrical steel and preparation method thereof
  • Non-oriented electrical steel and preparation method thereof
  • Non-oriented electrical steel and preparation method thereof

Examples

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Effect test

preparation example Construction

[0043] see figure 1 , a method for preparing a non-oriented electrical steel provided in an embodiment of the present invention, comprising the following steps:

[0044] Step 1) Smelting molten steel, the composition of molten steel obtained by smelting includes C: 0.0010-0.0050%, Si≤2.5%, Al≤0.01%, Mn≤0.80%, P≤0.10%, S≤0.0070%, N≤ 0.0030%, the rest is Fe and unavoidable impurities.

[0045] Step 2) The molten steel obtained by smelting is continuously cast into steel coils by thin strip casting and rolling process. The thickness of the steel plate is 1.5-2.5 mm. If the coiling temperature is lower than 680°C, the proportion of deformed structure of the steel plate will be high, which will affect the magnetic properties of the steel. Therefore, the coiling temperature should be controlled at 680-780°C. Moreover, the coiling temperature is best controlled at 700°C to 750°C. The full-thickness structure of the hot-rolled sheet produced by twin-roll thin strip continuous casti...

Embodiment 1

[0056] Clean steel smelting process is used to smelt molten steel. In terms of mass percentage, the composition of molten steel obtained by smelting includes C: 0.0010, Si: 2.05%, Al: 0.01%, Mn: 0.80%, P: 0.10%, S: 0.0070%, N: 0.0030%, the rest is Fe and unavoidable impurities.

[0057] The molten steel with the above components is continuously cast into steel coils with a steel plate thickness of 1.5 through thin strip casting and rolling (ie, twin-roll casting + one-frame temper rolling), and the coiling temperature is controlled at 680°C.

[0058] Then the off-line hot coils are immediately subjected to heat preservation and annealing in a box furnace, protected by a non-oxidizing protective atmosphere, such as N 2 Stable gas is used for protection, the heating rate of the box furnace is controlled at 5°C / min, the soaking temperature is controlled at 700°C, and the holding time is 1h.

[0059] The annealed steel coil was naturally cooled to room temperature.

[0060] Carr...

Embodiment 2

[0066] Example 2 is the same as Example 1 in that the Si content in the non-oriented electrical steel molten steel obtained by smelting is 2.05%, and the elemental composition and the preparation process of the non-oriented electrical steel molten steel obtained by smelting are the same. Although the mass percentage content of other elements in the non-oriented electrical steel molten steel obtained in embodiment 2 and the embodiment 1 are slightly different and the process parameters in the process are slightly different, the values ​​of the mass percentage content and process parameters are all within the range of the present invention. The corresponding component content of the provided non-oriented electrical steel and the process parameter range of the preparation method of the non-oriented electrical steel. The Si content of the embodiment of the present invention, whether it is heat-preserved and annealed in a box-type furnace, and the magnetic detection of the finished ...

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Abstract

The invention provides non-oriented electrical steel which comprises the following components in percentage by mass: 0.0010-0.0050% of C, less than or equal to 2.5% of Si, less than or equal to 0.01% of Al, less than or equal to 0.80% of Mn, less than or equal to 0.10% of P, less than or equal to 0.0070% of S, less than or equal to 0.0030% of N and the balance of Fe and inevitable impurities. The invention further provides a preparation method of the non-oriented electrical steel. According to the non-oriented electrical steel, segregation or rare earth and other precious elements are not added, the magnetic performance is good, the yield is high, and the preparation method of the non-oriented electrical steel is simple in technological process, short in production period, low in preparation cost and free of hot-rolled plate normalizing.

Description

technical field [0001] The invention relates to the technical field of electrical steel, in particular to a non-oriented electrical steel and a preparation method thereof. Background technique [0002] Non-oriented electrical steel is a necessary material for the manufacture of household appliances such as washing machines, refrigerators, air conditioners, and electric fans, as well as micro and small and medium-sized motors. It is used in a very large amount, often accounting for more than 70% of the output of electrical steel. Among them, cold-rolled non-oriented electrical steel is very suitable for manufacturing micro and small and medium-sized motors because of its high magnetic induction intensity, simple process, and low manufacturing cost. It can improve motor efficiency, reduce power consumption, and reduce motor volume. Motor manufacturing materials. At present, the domestic production capacity of non-oriented electrical steel has been saturated and tends to be su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/12C21D1/26C21D1/74
CPCC22C38/02C22C38/04C22C38/06C22C38/004C21D8/1233C21D8/1244C21D8/1272C21D1/26C21D1/74C21D2211/005Y02P10/20
Inventor 窦为学曹喜军张觉灵史志鹏智新龙梁云飞
Owner 河北敬业高品钢科技有限公司