Ultrafine grain high-silicon electrical steel sheet and manufacturing method thereof

A high-silicon electrical steel and ultra-fine grain technology, applied in the field of electrical steel manufacturing, can solve the problems of serious equipment corrosion, difficulty in cold rolling, thin plate plastic, toughness deterioration, etc., and achieves refined solidification structure and simple manufacturing process. Effect

Inactive Publication Date: 2015-07-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the CVD method has been successfully applied to the production of 6.5% Si high-silicon electrical steel by Japan Steel Tube Company. Si penetrates into the substrate to prepare 6.5% Si high-silicon electrical steel. This method cleverly avoids the difficulty of cold-rolling high-silicon electrical steel. However, due to its complex process, serious equipment corrosion, and large pollution, not widely used
Thin strip continuous casting is a new technology emerging in recent years. It is characterized by using two counter-rotating crystallization rollers to directly produce 1~5mm thin strips from molten steel. This method produces high-silicon electrical steel with short process and energy saving. Emission reduction, high production efficiency, low production cost and other significant advantages. However, the initial structure of the high-silicon electrical steel thin strip produced by twin-roll continuous casting is relatively coarse, and the plasticity and toughness of the thin plate deteriorate sharply. Therefore, how to refine the initial structure of high-silicon electrical steel thin strip becomes a key problem to be solved urgently in the production of high-silicon electrical steel by twin-roll thin-strip continuous casting

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  • Ultrafine grain high-silicon electrical steel sheet and manufacturing method thereof
  • Ultrafine grain high-silicon electrical steel sheet and manufacturing method thereof
  • Ultrafine grain high-silicon electrical steel sheet and manufacturing method thereof

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preparation example Construction

[0022] The technological process of preparing ultra-fine-grained high-silicon electrical steel sheet of the present invention is as follows figure 1 As shown, the specific implementation steps are:

[0023] Smelting molten steel with a mass fraction of Si of 2.5-6.8% and making the mass fraction of oxygen or sulfur in the molten steel 0.0005-0.01%, adding one or both of rare earth elements La and Y with a mass fraction of 0.03-0.2%, molten steel The composition also includes 0.002~0.01% C by mass fraction, 0.05~1.5% Mn, 0.02~1.5% Al, P <0.1%, N <0.01%, and the balance is Fe and unavoidable impurities.

[0024] The molten steel in the ladle 1 is poured into the tundish 2, and the molten steel in the tundish 2 flows into the cavity composed of two counter-rotating crystallization rollers 3 and side sealing plates to form a molten pool 4, and the process of molten steel in the molten pool 4 The heat is 10~70°C, the length of the contact arc between the molten steel and the surfa...

Embodiment 1

[0026] The ultra-fine-grained high-silicon electrical steel sheet of this embodiment has the following components by mass percentage: 0.002%C, 0.05%Mn, 0.02%Al, 0.005%P, 0.002%N, 6.8%Si, 0.0005%O, 0.03% % rare earth elements La and Y, and the balance is Fe; the average grain size of the high silicon electrical steel sheet is 16 μm.

[0027] The manufacturing method of the above-mentioned ultra-fine-grained high-silicon electrical steel sheet is carried out according to the following steps:

[0028] (1) For smelting molten steel, the composition of molten steel is 0.002%C, 0.05%Mn, 0.02%Al, 0.005%P, 0.002%N, 6.8%Si in terms of mass percentage, and the mass fraction of oxygen in molten steel is controlled to be 0.0005%. The molten steel is added with a mass fraction of 0.03% rare earth elements La and Y;

[0029] (2) The smelted molten steel is poured into the cavity composed of two counter-rotating crystallization rollers 3 and two side sealing plates through the tundish 2 to ...

Embodiment 2

[0034] The ultra-fine-grained high-silicon electrical steel sheet in this embodiment has the following components by mass percentage: 0.005%C, 0.5%Mn, 0.5%Al, 0.05%P, 0.005%N, 2.5%Si, 0.005%S, 0.1 % rare earth element Y, the balance is Fe; the average grain size of the high-silicon electrical steel sheet is 10 μm.

[0035] The manufacturing method of the above-mentioned ultra-fine-grained high-silicon electrical steel sheet is carried out according to the following steps:

[0036](1) Smelting molten steel, the composition of molten steel is 0.005%C, 0.5%Mn, 0.5%Al, 0.05%P, 0.005%N, 2.5%Si according to the mass percentage, and the mass fraction of sulfur in molten steel is controlled to be 0.005%. The molten steel is added with a mass fraction of 0.1% rare earth element Y;

[0037] (2) The smelted molten steel is poured into the cavity composed of two counter-rotating crystallization rollers 3 and two side sealing plates through the tundish 2 to form a molten pool 4. The heigh...

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Abstract

The invention belongs to the field of manufacture of electrical steel and particularly relates to an ultrafine grain high-silicon electrical steel sheet and a manufacturing method thereof. The ultrafine grain high-silicon electrical steel sheet comprises the following components in percentage by weight: 2.5-6.8 percent of Si, 0.0005-0.01 percent of O or S, 0.03-0.2 percent of a rare earth element, 0.002-0.01 percent of C, 0.05-1.5 percent of Mn, 0.02-1.5 percent of Al, 0.1 percent of P<, 0.01 percent of N< and the balance of Fe, and the average grain size is 10-20 mu m. The manufacturing method comprises the following steps: adding the rare earth element into molten steel during smelting, pouring the smelted molten steel into a cavity composed of two crystallization rollers capable of reverse rotation and two side sealing plates through a tundish to form a molten pool, leaving the molten steel to solidify in the molten pool along with the rotation of the crystallization rollers and then leading out so as to obtain the ultrafine grain high-silicon electrical steel sheet with a thickness of 1-5 mm and a width of 100-2000 mm. According to the ultrafine grain high-silicon electrical steel sheet and the manufacturing method thereof provided by the invention, the initial as-cast structure of high-silicon electrical steel can be effectively refined, the average grain size of the prepared high-silicon electrical steel sheet is far smaller than that of a high-silicon electrical steel sheet prepared by other casting methods, and an ultrafine grain structure is beneficial to improving the toughness and the plasticity of the electrical steel sheet.

Description

technical field [0001] The invention belongs to the field of electrical steel manufacturing, and in particular relates to an ultrafine-grained high-silicon electrical steel thin plate and a manufacturing method thereof. Background technique [0002] High silicon electrical steel has excellent soft magnetic properties. For example, high-silicon electrical steel with a Si content of 6.5wt.% has high electrical resistance, high magnetic permeability, high magnetization, close to zero magnetostriction, very low eddy current and hysteresis under high frequency conditions Loss etc. Therefore, high-silicon electrical steel is an ideal material for manufacturing high-frequency motors and high-frequency transformer cores. However, as the Si content increases, the toughness and plasticity of the material deteriorate, making fabrication difficult. Especially when the Si content increases to 6.5wt.%, the appearance of the ordered phase makes the toughness and plasticity of the materi...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C33/04
Inventor刘海涛王项龙李昊泽安灵子张宝光刘文强赵士淇曹光明李成刚刘振宇王国栋
OwnerNORTHEASTERN UNIV