Method for preparing high-silicon steel from low-silicon steel

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

Active Publication Date: 2016-02-03
NORTHEASTERN UNIV
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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 eleme

Method used

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  • Method for preparing high-silicon steel from low-silicon steel
  • Method for preparing high-silicon steel from low-silicon steel
  • Method for preparing high-silicon steel from low-silicon steel

Examples

Experimental program
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Example Embodiment

[0039] Example 1

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

Example Embodiment

[0041] Example 2

[0042] Using a 2.2mm thick 0.5wt% silicon steel hot-rolled sheet as a base material, a conventional synchronous rolling mill is used to perform 4 passes of cold rolling with a reduction of 95% to obtain a 0.10mm thick sheet. Decontamination and rust removal by pickling. A silicon infiltrating agent composed of silicon powder + 1.0 wt% ammonium chloride was passed through argon at room temperature for 10 minutes, heated to 500° C., and put into a thin plate, and kept for 20 minutes. The siliconizing agent composed of silicon powder + 0.7wt% ammonium chloride was blown into argon gas at room temperature for 10 minutes, heated to 800°C, and then put into a heat-preserving sheet for 25 minutes of solid siliconizing, forming on the surface of the sheet A dense silicon infiltrated layer with a thickness of about 20μm, the phase of which is Fe 3 Si+FeSi. Roll the sheet at 400°C with a reduction of about 2%; by volume percentage, under the protection of 80% nitrogen ...

Example Embodiment

[0043] Example 3

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

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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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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
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