A kind of high-silicon gradient silicon steel strip and its preparation method

A thin strip, silicon steel technology, applied in solid diffusion coating, coating, metal material coating process, etc., can solve the problem of serious cold brittleness, achieve the effect of fast response, small size and avoid brittle cracking

Active Publication Date: 2022-04-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • 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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  • A kind of high-silicon gradient silicon steel strip and its preparation method
  • A kind of high-silicon gradient silicon steel strip and its preparation method
  • A kind of high-silicon gradient silicon steel strip and its preparation method

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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

A high-silicon gradient silicon steel thin strip and its preparation method according to the present invention, the thin strip includes components and mass percentages of C 0.001-0.08%, Si 4.5-6.5%, the balance is Fe and unavoidable impurities, and the thickness is 0.1~0.35mm, width≤1000mm, magnetic induction (B8) / T 1.25‑1.56, iron loss P10 / 400 5.1‑12W / kg, strength 470‑720MPa, elongation 2.5‑10%. During preparation, the silicon steel thin strip raw material is surface treated, preheated at a specific temperature in turn, after the reduction operation, the first stage of siliconizing treatment is performed, and after annealing, the second stage of siliconizing and annealing treatment is performed, and cooled at a specific cooling rate to room temperature to prepare high silicon gradient silicon steel thin strips. This process uses ultra-thin low-silicon steel strip as the initial raw material, which avoids brittle cracking in the rolling process of high-silicon steel, and can produce high-silicon-concentration-gradient thin strip products with the same Si content on the surface and the core or gradually reduced Si content. Silicon steel thin strip has excellent overall properties.

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 Patents(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 LIAONING
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