A method for preparing high silicon steel from low silicon steel

A technology of low-silicon steel and high-silicon steel is applied in the field of material preparation, which can solve the problems of low price, waiting, easy recovery and recrystallization, etc., and achieve good magnetic properties and the effect of suppressing eddy current loss.

Active Publication Date: 2018-01-16
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the asynchronous rolling technology has not been widely used in industry, the application of this method still needs to be matured by the rolling technology.
In addition, considering the cost of industrial applications, low-silicon steel is not only low in price, but also has good ductility due to its low content of alloying elements (especially silicon) and impurities, and is easy to process and shape to meet the strict tolerance of iron core laminations on thickness. Requirements, but the low content of alloying elements also makes the plate more prone to recovery and recrystallization, resulting in defects introduced by cold rolling cannot play a role in siliconizing

Method used

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  • A method for preparing high silicon steel from low silicon steel
  • A method for preparing high silicon steel from low silicon steel
  • A method for preparing high silicon steel from low silicon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A 0.5wt% silicon steel hot-rolled sheet with a thickness of 2.2mm was used as a base material, and a conventional synchronous rolling mill was used for 3 passes of cold rolling with a reduction of 84% to obtain a thin sheet with a thickness of 0.35mm. Decontamination and rust removal by pickling. The siliconizing agent composed of silicon powder + 3.0wt% ammonium chloride is passed through argon gas at room temperature for 10 minutes, heated to 550° C., put into the thin plate, and kept for 30 minutes. Put the siliconizing agent composed of silicon powder + 0.5wt% ammonium chloride into the argon gas at room temperature for 10 minutes, heat it to 820°C, put it into the heat-preserved thin plate, carry out solid siliconizing for 25 minutes, and form on the surface of the thin plate A dense siliconized layer with a thickness of about 65 μm ( figure 1 ), its phase is Fe 3 Si+FeSi( figure 2). The thin plate is rolled at 400°C with a reduction of about 2%; according to ...

Embodiment 2

[0042] Using a 0.5wt% silicon steel hot-rolled sheet with a thickness of 2.2mm as the base material, a conventional synchronous rolling mill is used for 4 passes of cold rolling with a reduction of 95% to obtain a thin sheet with a thickness of 0.10mm. Decontamination and rust removal by pickling. The siliconizing agent composed of silicon powder + 1.0wt% ammonium chloride is passed through argon gas at room temperature for 10 minutes, heated to 500° C., put into the thin plate, and kept for 20 minutes. Put the siliconizing agent composed of silicon powder + 0.7wt% ammonium chloride into argon gas at room temperature for 10 minutes, heat it to 800°C, put it into the heat-preserved thin plate, and carry out solid siliconizing for 25 minutes, forming on the surface of the thin plate A dense siliconized layer with a thickness of about 20 μm, whose phase is Fe 3 Si+FeSi. The thin plate is rolled at 400°C with a reduction of about 2%; according to the volume percentage, under the...

Embodiment 3

[0044] A 1.0wt% silicon steel hot-rolled sheet with a thickness of 2.2mm was used as a base material, and a conventional synchronous rolling mill was used for 4 passes of cold rolling with a reduction of 86% to obtain a thin sheet with a thickness of 0.30mm. Decontamination and rust removal by pickling. The siliconizing agent composed of silicon powder + 2.0wt% ammonium chloride is passed through argon gas at room temperature for 10 minutes, heated to 550° C., put into the thin plate, and kept for 30 minutes. Put the siliconizing agent composed of silicon powder + 0.5wt% ammonium chloride into the argon gas at room temperature for 10 minutes, heat it to 820°C, put it into the heat-preserved thin plate, carry out solid siliconizing for 20 minutes, and form on the surface of the thin plate A dense siliconized layer with a thickness of about 56 μm, whose phase is Fe 3 Si+FeSi. The thin plate is rolled at 400°C with a reduction of about 2%; according to the volume percentage, un...

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Abstract

The invention belongs to the field of material preparation, in particular to a method for preparing high-silicon steel from low-silicon steel. The method comprises the following steps: a, using a low-silicon steel hot-rolled plate with a smooth surface as a base material, and carrying out cold rolling so as to obtain a thin plate; b, carrying out acid pickling on the thin plate so as to remove oil stains and an oxide film on the surface; c, in a temperature range of 450-550DEG C, carrying out thermal insulation on the cold-rolled thin plate in a solid siliconizing agent for 20-30 minutes; d, in a temperature range of 750-820DEG C, carrying out solid siliconizing on the thermally insulated thin plate for 10-30 minutes in the solid siliconizing agent; e, rolling the thin plate at a temperature of 350-450DEG C; f, at a non-oxidization atmosphere, carrying out diffusion annealing on the siliconized thin plate at a temperature of 850-1100 DEG C for 30-480 minutes; and g, under nitrogen protection, rapidly cooling the thin plate subjected to diffusion annealing to a room temperature and coating a MgO coating. The method is characterized by low raw materials and simple processing and treating. The problems of steel band surface serious corrosion and Fe losses, caused by high Cl-ion concentration in the process of preparing the high-silicon steel by a vapor deposition process are solved.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a method for preparing high-silicon steel from low-silicon steel. Background technique [0002] Fe-6.5W.t% Si alloy (called high-silicon steel) has excellent comprehensive magnetic properties such as high magnetic permeability, low iron loss and close to zero magnetostriction. It is an ideal soft magnetic material for the replacement of electromechanical equipment. However, high silicon also makes the elongation at room temperature close to zero, making it difficult to produce by conventional cold rolling methods. So far, the development of high-silicon steel can be divided into two categories. One is to directly prepare high-silicon steel by special metallurgical-processing methods, such as: special rolling method, rapid solidification method, powder calendering and sintering method, and direct casting method; The second is to siliconize the 3% silicon steel plate, such as: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/46C21D8/02C23C28/04
CPCC21D8/0257C23C10/46C23C28/04
Inventor 刘刚李超刘勇凯沙玉辉
Owner NORTHEASTERN UNIV LIAONING
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