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A pulse current method for rapid preparation of grain-oriented thin strip electrical steel at room temperature

A pulse current, electrical steel technology, applied in the field of rapid preparation of oriented thin strip electrical steel, can solve the problems of high required temperature, long preparation time, complicated means, etc., and achieve the effect of saving energy and reducing temperature and time

Active Publication Date: 2020-07-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the two types of inventions have complex process means, long preparation time, and high temperature required, which is not conducive to energy saving, and the high-voltage pulse parameters are difficult to anneal and industrialize electrical steel thin strips with small thickness.

Method used

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  • A pulse current method for rapid preparation of grain-oriented thin strip electrical steel at room temperature
  • A pulse current method for rapid preparation of grain-oriented thin strip electrical steel at room temperature
  • A pulse current method for rapid preparation of grain-oriented thin strip electrical steel at room temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0019] In this embodiment, a pulse current annealing treatment is performed on a 0.1 mm cold-rolled oriented thin-strip electrical steel. Specific steps are as follows:

[0020] Step 1: Take a 30mm×5mm×0.1mm cold-rolled sample and grind both ends to ensure good contact with the pulse electrode.

[0021] Step 2: Set the parameter range of the pulse current, and determine the pulse current parameters as 100Hz, 150μs, 200A.

[0022] Step 3: Apply MgO coating evenly on the cold-rolled sample and fix it at the output end of the pulse power supply with a fixture so that the current direction is parallel to the rolling direction, and perform pulse current annealing treatment for 5 minutes. At the same time, according to the pulse parameters under the test The temperature of the sample was raised to 680°C, and the sample was annealed in a resistance furnace at 680°C for 5 minutes. The EBSD characterization of the samples after pulse current annealing treatment and the samples after ...

Embodiment 2

[0024] In this embodiment, a pulse current annealing treatment is performed on a 0.1 mm cold-rolled oriented thin-strip electrical steel. Specific steps are as follows:

[0025] Step 1: Take a 30mm×5mm×0.1mm cold-rolled sample and grind both ends to ensure good contact with the pulse electrode.

[0026] Step 2: Set the parameter range of the pulse current, and determine the pulse current parameters as 125Hz, 200μs, 200A.

[0027] Step 3: Apply MgO coating evenly on the cold-rolled sample and fix it at the output end of the pulse power supply with a fixture so that the current direction is parallel to the rolling direction, and perform pulse current annealing treatment for 5 minutes. At the same time, according to the pulse parameters under the test The temperature of the sample was raised to 800°C, and the sample was annealed in a resistance furnace at 800°C for 5 minutes. The EBSD characterization of the samples after pulse current annealing treatment and the samples after ...

Embodiment 3

[0029] In this embodiment, a pulse current annealing treatment is performed on a 0.1 mm cold-rolled oriented thin-strip electrical steel. Specific steps are as follows:

[0030] Step 1: Take a 30mm×5mm×0.1mm cold-rolled sample and grind both ends to ensure good contact with the pulse electrode.

[0031] Step 2: Set the parameter range of the pulse current, and determine the pulse current parameters of the sample as 100Hz, 200μs, 200A.

[0032] Step 3: Apply the MgO coating evenly on the cold-rolled sample A and fix it on the output end of the pulse power supply with a clamp, so that the current direction is parallel to the rolling direction, and perform pulse current annealing treatment for 5 minutes. At the same time, the cold-rolled sample B is uniformly After the MgO coating was applied, it was fixed at the output end of the pulse power supply with a clamp so that the current direction was perpendicular to the rolling direction, and pulse current annealing was performed fo...

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Abstract

The invention provides a method for rapidly preparing oriented thin strip electrical steel at a room temperature by using a pulse current and belongs to the technical field of silicon steel preparation. The method for rapidly preparing the oriented thin strip electrical steel at the room temperature by using the pulse current comprises the steps of determining an orientation relation between a current and rolling; fixing 0.1 mm cold-rolled oriented thin strip electrical steel on a pulse power supply by using a fixture; continuously applying a pulse to a corresponding time; carrying out pulse annealing treatment on the oriented thin strip electrical steel; and determining a pulse current acting direction, a pulse current parameter and a pulse current acting time according to the rolling direction and the room temperature environment of pulse current annealing treatment, wherein the pulse treatment parameter range is that the frequency is 1-200 Hz, the pulse width is 10 microseconds to 1millisecond, the current is 10-1000A, and the acting time is 1-30 min. According to the method for rapidly preparing the oriented thin strip electrical steel at the room temperature by using the pulse current, the growing direction of a Goss texture in a cold-rolled sample with a smaller thickness can be controlled, and a more sharp Goss texture can be obtained; and meanwhile, the temperature needed by secondary recrystallization can also be reduced, the time needed by secondary recrystallization can also be shortened, a lot of energy is saved, and the preparation process flow of the orientedthin strip electrical steel is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of silicon steel preparation, and in particular relates to a method for rapidly preparing oriented thin-strip electrical steel at room temperature by pulse current. Background technique [0002] Electrical steel is an important and indispensable soft magnetic alloy for power, electronics and military industries, accounting for 90% to 95% of the total magnetic materials, and it is also the metal functional material with the largest output. Among them, oriented electrical steel has high magnetic induction and low It is used to make iron cores in transformers and large distributors that work under directional magnetic fields. However, the complex processing process and very strict control requirements lead to high manufacturing costs, and foreign oriented silicon steel production technologies are also protected in the form of patents, which are regarded as the life of the enterprise. Therefore, grain-oriented ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D1/04C21D1/26
CPCC21D1/04C21D1/26C21D8/1233C21D8/1244C21D8/1277
Inventor 张新房周梦程
Owner UNIV OF SCI & TECH BEIJING
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