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A low iron loss non-oriented electrical steel adapted to high frequency working conditions and its production method

A technology of oriented electrical steel and production method, which is applied in the field of electrical steel, can solve problems such as the difficulty of low iron loss performance, and achieve the effects of improving electromagnetic performance, reducing eddy current loss, and reducing total loss

Active Publication Date: 2022-12-02
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the material properties of non-oriented electrical steel, it is very difficult to obtain low iron loss performance under power frequency and high frequency conditions at the same time

Method used

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  • A low iron loss non-oriented electrical steel adapted to high frequency working conditions and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for producing non-oriented electrical steel with low iron loss under high-frequency conditions, specifically comprising the following steps:

[0030] 1) The molten steel after vacuum smelting is continuously cast into a slab with a thickness of 230mm. The crystallizer in the continuous casting process uses electromagnetic stirring. The chemical composition weight percentages of the slab are Si: 2.65%; Als: 0.58%; Mn: 0.25% ;P: 0.06%; C+S+N+Ti: 75ppm, and the content of each element is ≤25ppm, and the rest is Fe and unavoidable impurity elements;

[0031] 2) Raise the temperature of the slab through a walking heating furnace. The temperature of the slab is 1140°C, and the time is 150min. Then, it is subjected to 6 passes of rough rolling and 7 passes of finish rolling to a thickness of 2.0mm. The final rolling temperature is 840°C. After water cooling and air cooling Coiling at a temperature of 600°C;

[0032] 3) The normalizing temperature of the hot-rolled sh...

Embodiment 2

[0038] A method for producing non-oriented electrical steel with low iron loss under high-frequency conditions, specifically comprising the following steps:

[0039] 1) The molten steel after vacuum smelting is continuously cast into a slab with a thickness of 230mm. The crystallizer in the continuous casting process uses electromagnetic stirring. The chemical composition weight percentages of the slab are Si: 2.80%; Als: 0.63%; Mn: 0.30% ;P: 0.05%; C+S+N+Ti: 80ppm, and the content of each element is ≤30ppm, and the rest is Fe and unavoidable impurity elements;

[0040] 2) Raise the temperature of the slab through a walking heating furnace, the temperature of the slab is 1080°C, and the time is 150min, and then undergoes 6 passes of rough rolling and 7 passes of finish rolling to a thickness of 2.2mm, and the final rolling temperature is 840°C, after water cooling and air cooling Coiling at a temperature of 600°C;

[0041] 3) The normalizing temperature of the hot-rolled sheet ...

Embodiment 3

[0047] A low iron loss non-oriented electrical steel adapted to high frequency working conditions and a processing method thereof, specifically comprising the following steps:

[0048] 1) The molten steel after vacuum smelting is continuously cast into a slab with a thickness of 230mm. The crystallizer in the continuous casting process uses electromagnetic stirring. The chemical composition weight percentages of the slab are Si: 2.58%; Als: 0.64%; Mn: 0.28% ;P: 0.03%; C+S+N+Ti: 75ppm, and the content of each element is ≤30ppm, and the rest is Fe and unavoidable impurity elements;

[0049] 2) Raise the temperature of the slab through a walking heating furnace. The temperature of the slab is 1150°C, and the time is 150min. Then it is subjected to 6 passes of rough rolling and 7 passes of finish rolling to a thickness of 2.2mm. The final rolling temperature is 840°C. After water cooling and air cooling Coiling at a temperature of 600°C;

[0050] 3) The normalizing temperature of...

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Abstract

The invention discloses a low iron loss non-oriented electrical steel suitable for high-frequency working conditions and a production method thereof. The production method comprises the following steps: continuous casting of molten steel into a slab—hot rolling—normalizing—pickling—cold rolling —Continuous annealing—apply insulating coating and solidify; in the cold rolling step, a six-high single-stand reciprocating rolling mill is used to cold-roll to the target thickness through 5 passes, and the first three passes in the cold-rolling process adopt variable-speed asynchronous rolling The method is to increase the dislocation density of the surface layer of the steel plate under the action of shear stress, so that after annealing, the grain size of the surface layer is refined and the grain size of the core portion is thick, and the method of the present invention can produce the core portion as a coarse equiaxed grain size, and the surface layer is For electrical steel products with nanoscale fine equiaxed grains, the iron loss of the product is P 1.5 / 50 ≤2.35W / kg, P 1.0 / 400 ≤14.0W / kg.

Description

technical field [0001] The invention belongs to the technical field of electrical steel, and in particular relates to a low iron loss non-oriented electrical steel suitable for high-frequency working conditions and a production method thereof. Background technique [0002] With the development of frequency conversion technology, speed control and frequency conversion have increasingly become the main direction of motor development. Affected by the working environment, motors need to run at different speeds and frequency ranges. Motors with high speed requirements need to run at higher frequencies for a long time . Non-oriented electrical steel sheet is an important soft magnetic material for making motor cores. When making high-speed motors, it is required not only to have low iron loss under power frequency (50Hz) conditions, but also to have low iron loss under high-frequency conditions. Iron loss performance. Limited by the material properties of non-oriented electrical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D1/26C21D1/28C21D1/74C22C38/02C22C38/06C22C38/04
CPCC21D8/1222C21D8/1261C21D8/1233C21D8/1283C21D1/26C21D1/28C21D1/74C22C38/02C22C38/06C22C38/04C22C38/002C22C38/004C21D2211/005
Inventor 刘青松裴英豪施立发占云高程国庆陆天林
Owner MAANSHAN IRON & STEEL CO LTD