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EI type orientation silicon steel plate annealing process

A technology of oriented silicon steel and annealing process, which is applied in the field of annealing process of EI-shaped oriented silicon steel sheets, can solve the problems that silicon steel sheets are easy to stick together, silicon steel sheets are easily oxidized, and service performance is degraded, and the no-load current is reduced. The effect of improved workpiece performance and reduced no-load loss

Inactive Publication Date: 2013-08-28
NANTONG XINJINGLONG ELECTRICAL APPLIANCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current EI-shaped oriented silicon steel sheet does not undergo degreasing treatment during the annealing process, and each silicon steel sheet is easy to stick together after annealing, which brings a lot of inconvenience to the subsequent work; in addition, the silicon steel sheet is easily oxidized during the annealing process, resulting in its The use performance is reduced, affecting the quality of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The annealing process of EI-shaped oriented silicon steel sheet includes degreasing step, heating annealing and cooling step, degreasing step: put the workpiece into the annealing furnace and heat up to 300°C, and then continuously fill the annealing furnace with 99.9% pure Nitrogen gas is used to exhaust the exhaust gas in the furnace, and the furnace is kept warm for 100 minutes to prevent the oxidation of the workpiece and form a protective layer on the surface of the workpiece;

[0013] Heating and annealing step: continue to heat up the workpiece to 800°C and keep it warm for 160 minutes, and keep nitrogen filling during the whole heating and holding process;

[0014] Cooling step: the annealing furnace stops heating, and the workpiece starts to cool down. During the cooling process, the nitrogen gas is still filled until the workpiece cools below 250°C, and the nitrogen gas filling is stopped, and the workpiece can be released from the furnace.

Embodiment 2

[0016] The annealing process of EI-shaped oriented silicon steel sheet includes degreasing step, heating annealing and cooling step, degreasing step: put the workpiece into the annealing furnace and heat up to 350°C, and then continuously fill the annealing furnace with 99.9% purity Nitrogen, exhaust the exhaust gas in the furnace, keep the furnace for 90 minutes to prevent oxidation of the workpiece, and at the same time form a protective layer on the surface of the workpiece;

[0017] Heating annealing step: continue to heat up the workpiece to 820°C and keep it warm for 150 minutes, and keep nitrogen gas filling during the whole heating and holding process;

[0018] Cooling step: the annealing furnace stops heating, and the workpiece starts to cool down. During the cooling process, the nitrogen gas is still filled until the workpiece cools below 250°C, and the nitrogen gas filling is stopped, and the workpiece can be released from the furnace.

Embodiment 3

[0020] The annealing process of EI-shaped oriented silicon steel sheet includes degreasing step, heating annealing and cooling step, degreasing step: put the workpiece into the annealing furnace and heat up to 330°C, and then continuously fill the annealing furnace with 99.9% or more purity Nitrogen gas is used to exhaust the exhaust gas in the furnace, and the furnace is kept warm for 950 minutes to prevent the oxidation of the workpiece and form a protective layer on the surface of the workpiece;

[0021] Heating annealing step: continue to raise the temperature of the workpiece to 810°C and keep it warm for 155 minutes, and keep nitrogen filling during the whole heating and holding process;

[0022] Cooling step: the annealing furnace stops heating, and the workpiece starts to cool down. During the cooling process, the nitrogen gas is still filled until the workpiece cools below 250°C, and the nitrogen gas filling is stopped, and the workpiece can be released from the furnac...

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PUM

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Abstract

The invention discloses an EI type orientation silicon steel plate annealing process, which comprises a heating and annealing step and a cooling step, characterized in that the annealing process also comprises a degreasing step. The advantages of the invention are as following: the process is simple, the operation is easy, the workpiece after annealing is not sticky and the usage is convenint; the workpiece performance is raised; the load current is reduced by 20-30%; the load loss is reduced by 35-40%.

Description

technical field [0001] The invention relates to an annealing process, in particular to an annealing process for an EI-shaped oriented silicon steel sheet. Background technique [0002] The current EI-shaped oriented silicon steel sheet does not undergo degreasing treatment during the annealing process, and each silicon steel sheet is easy to stick together after annealing, which brings a lot of inconvenience to the subsequent work; in addition, the silicon steel sheet is easily oxidized during the annealing process, resulting in its The use performance is reduced, which affects the quality of the product. Therefore, a new technical solution is needed to solve the above technical problems. Contents of the invention [0003] The purpose of the present invention is to provide a new annealing process for EI-shaped oriented silicon steel sheet. With the annealing process, the silicon steel sheet will not stick after being annealed, the service performance will be improved obvi...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D1/74
Inventor 周小华杨晓东陈锋
Owner NANTONG XINJINGLONG ELECTRICAL APPLIANCES