High-silicon gradient silicon steel thin strip and preparation method thereof

A technology of silicon steel and thin strip, which is applied in the direction of solid-state diffusion coating, coating, metal material coating technology, etc., can solve the problems of severe cold brittleness, etc., and achieve the effect of fast reaction speed, excellent overall performance and continuous process

Active Publication Date: 2021-02-26
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the existing high-silicon steel preparation process and provide a preparation method capable of producing high-silicon gradient silicon steel strips. The silicon content on the surface is prepared by a multi-stage heat treatment process up to 6.5% Si, and the interior is gradient Distributed high-silicon gradient silicon steel thin strips to solve the problem of severe cold brittleness in the existing high-silicon steel preparation process

Method used

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  • High-silicon gradient silicon steel thin strip and preparation method thereof
  • High-silicon gradient silicon steel thin strip and preparation method thereof
  • High-silicon gradient silicon steel thin strip and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1. Raw materials: silicon content 2.5%, balance Fe; thin silicon steel strip with a thickness of 0.28mm and a width of 80mm. Through alkali cleaning, electrolytic cleaning, drying and other processes, the grease and dust on the surface are washed away to obtain a clean surface.

[0036] 2. Roughness treatment is carried out on the surface of the strip steel, and the roughness Ra=1.57μm;

[0037] 3. Enter the heating furnace, preheat to 1000°C under the condition of non-oxidizing atmosphere protected by inert gas, and keep warm for 2 minutes;

[0038] 4. Enter the reduction zone and heat to 1150°C under the non-oxidizing atmosphere of the mixture of hydrogen and inert gas for 2 minutes;

[0039] 5. Enter the first section of siliconizing area, spray nitrogen + silicon tetrachloride mixed gas on the upper and lower surfaces of the silicon steel strip through several sets of nozzles, the volume fraction of silicon tetrachloride is 20%, and react under the heating conditio...

Embodiment 2

[0046] 1. Raw materials: silicon content of 2.5%; thin silicon steel strip with a thickness of 0.17mm and a width of 200mm. Through alkali cleaning, electrolytic cleaning, drying and other processes, the grease and dust on the surface are washed away to obtain a clean surface.

[0047] 2. Roughness treatment is carried out on the surface of the strip steel, and the roughness Ra=1.36μm;

[0048] 3. Enter the heating furnace, preheat to 900°C under the condition of non-oxidizing atmosphere protected by inert gas, and keep warm for 2 minutes;

[0049] 4. Enter the reduction zone and heat to 1150°C under the non-oxidizing atmosphere of the mixture of hydrogen and inert gas for 2 minutes;

[0050] 5. Enter the first section of siliconizing area, spray nitrogen + silicon tetrachloride mixed gas on the upper and lower surfaces of the silicon steel thin strip through several sets of nozzles, the volume fraction of silicon tetrachloride is 30%, and react under the heating condition of...

Embodiment 3

[0055] 1. Raw materials: silicon content 2.8%; thin silicon steel strip with a thickness of 0.3mm and a width of 500mm. Through alkali cleaning, electrolytic cleaning, drying and other processes, the grease and dust on the surface are washed away to obtain a clean surface.

[0056] 2. Roughness treatment is carried out on the surface of the strip steel, and the roughness Ra=1.65μm;

[0057] 3. Enter the heating furnace, preheat to 1050°C under the condition of non-oxidizing atmosphere protected by inert gas, and keep warm for 2 minutes;

[0058] 4. Enter the reduction zone and heat it to 1140°C under the non-oxidizing atmosphere of the mixture of hydrogen and inert gas for 3 minutes;

[0059] 5. Enter the first section of siliconizing area, spray nitrogen + silicon tetrachloride mixed gas on the upper and lower surfaces of the silicon steel thin strip through several groups of nozzles, the volume fraction of silicon tetrachloride is 10%, and react under the heating condition ...

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Abstract

The invention discloses a high-silicon gradient silicon steel thin strip and a preparation method thereof. The steel thin strip comprises the following components in percentage by mass of 0.001 to 0.08% of C, 4.5 to 6.5% of Si and the balance of Fe and inevitable impurities, and has the thickness of 0.1 to 0.35mm, the width of less than or equal to 1000mm, the magnetic induction intensity (B8)/T of 1.25-1.56, the iron loss P10/400 of 5.1-12 W/kg, the strength of 470-720MPa and the ductility of 2.5-10%. During preparation, a silicon steel thin strip raw material is taken and subjected to surface treatment, and is sequentially subjected to preheating and reduction operation at a specific temperature, first-stage siliconizing treatment is conducted, second-stage siliconizing and annealing treatment is conducted after annealing, cooling is conducted to the room temperature at a specific cooling speed, and the high-silicon-gradient silicon steel thin strip is prepared. According to the process, an ultra-thin low-silicon steel thin strip is used as an initial raw material, brittle cracking in the high-silicon steel rolling process is avoided, a high-silicon concentration gradient thin strip product with the consistent Si content or the gradually-reduced Si content on the surface and the core can be prepared, and the prepared silicon steel thin strip has excellent overall performance.

Description

Technical field: [0001] The invention belongs to the technical field of silicon steel strip preparation, and in particular relates to a high-silicon gradient silicon steel strip and a preparation method thereof. Background technique: [0002] The performance of silicon steel is closely related to the silicon content. As the silicon content increases, the resistivity and magnetic permeability gradually increase, while the iron loss gradually decreases. When the silicon content reaches 6.5%, silicon steel has the advantages of high magnetic induction, ultra-low iron loss under medium and high frequency conditions, good stability and high strength, and is especially suitable for medium and high frequency motors, transformers and high frequency choke coils. Core material. According to the distribution of silicon content along the thickness direction, there are two types of high-silicon electrical steel ultra-thin strips: uniform silicon type and gradient silicon type. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C21D8/12C23C10/08
CPCC22C38/02C21D8/1277C21D8/1255C23C10/08
Inventor 李成刚曹光明刘振宇
Owner NORTHEASTERN UNIV
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