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Non-oriented electrical steel and preparation method thereof

A technology of oriented electrical steel and electrical steel, which is applied in the fields of electrical steel metallurgy and iron and steel metallurgy, can solve the problems of insufficient performance and high production cost of low-silicon non-oriented electrical steel, and achieve the effects of improved magnetic properties, improved performance, and uniform grain size

Active Publication Date: 2020-05-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-silicon non-oriented electrical steel with low iron loss, high magnetic induction and excellent properties such as high tensile strength and high yield strength by optimizing the product composition and changing its production process to solve the problem of Low-silicon non-oriented electrical steel produced by conventional processes has insufficient performance and high production costs

Method used

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  • Non-oriented electrical steel and preparation method thereof
  • Non-oriented electrical steel and preparation method thereof
  • Non-oriented electrical steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A production process of low-silicon non-oriented electrical steel. Including the following process steps:

[0029] S1. The converter adopts a 120-ton converter, the mass percentage of molten iron charged: [S]: 0.001%; ​​the mass percentage of the end point of converter smelting: C: 0.0025%, S: 0.0021%, P: 0.011%, [O]: 625ppm; final slag R: 3.3, the converter requires "bare steel" tapping, and 400kg of lime is added after tapping 1 / 5 of the steel;

[0030] S2. The temperature of the molten steel is 1629° C. after the temperature rise of the LF furnace is completed.

[0031] S3, RH vacuum treatment for 36min, circulating argon gas flow rate 900Nl / min, vacuum degree 1.8Mbar; alloying sequence is low-carbon low-titanium ferrophosphorus, aluminum, ultra-low carbon ferrosilicon, metal manganese, and the adding time interval is ≥3min;

[0032] Aluminum content

[0033] [O], ppm 300 400 500 600 700 Aluminum content, Kg 495 520 545 570 595

[0034...

Embodiment 2

[0041] A production process of low-silicon non-oriented electrical steel. Including the following process steps:

[0042] S1. The converter adopts a 120-ton converter, the mass percentage of molten iron charged: [S]: 0.0008%; the mass percentage of the end point of converter smelting: C: 0.0021%, S: 0.0024%, P: 0.012%, [O]: 850ppm; final slag R: 3.4, the converter requires "bare steel" tapping, and 450kg of lime is added after tapping 1 / 5 of the steel;

[0043] S2. After the temperature rise of the molten steel in the LF furnace is completed, the temperature of the molten steel is 1631°C, and 100kg of high-alumina slag is added to the slag surface of the ladle to modify the top slag;

[0044] S3, RH vacuum treatment for 38 minutes, circulating argon gas flow rate 1000Nl / min, vacuum degree 1.9Mbar; alloying sequence is low-carbon and low-titanium ferrophosphorus, aluminum, ultra-low carbon ferrosilicon, metal manganese, and the adding time interval is ≥3min;

[0045] Aluminum...

Embodiment 3

[0054] A production process of low-silicon non-oriented electrical steel. Including the following process steps:

[0055] S1. The converter adopts a 120-ton converter, the mass percentage of molten iron charged: [S]: 0.0008%; the mass percentage of the end point of converter smelting: C: 0.0023%, S: 0.0025%, P: 0.012%, [O]: 702ppm; final slag R: 3.38, the converter requires "bare steel" tapping, and 500kg of lime is added after tapping 1 / 5 of the steel;

[0056] S2. The temperature of the molten steel is 1634°C after the temperature rise of the LF furnace;

[0057] S3, RH vacuum treatment for 41 minutes, circulating argon gas flow rate 1200Nl / min, vacuum degree 1.96Mbar; alloying sequence is low-carbon low-titanium ferrophosphorus, aluminum, ultra-low carbon ferrosilicon, metal manganese, and the adding time interval is ≥3min;

[0058] Aluminum content

[0059] [O], ppm 300 400 500 600 700 Aluminum content, Kg 495 520 545 570 595

[0060] Alloyi...

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Abstract

The invention relates to non-oriented electrical steel and a preparation method thereof. The non-oriented electrical steel comprises the following chemical components of, in percentage by mass, less than or equal to 0.0030% of C, 0.90-1.00% of Si, 0.2-0.40% of Mn, 0.015-0.40% of P, less than or equal to 0.004% of S, 0.025-0.035% of Als, less than or equal to 0.001% of Ti and the balance Fe and inevitable impurities. The preparation method comprises the following steps of converter control; ladle furnace refining, and specifically, the temperature of molten steel is increased to 1620 DEG C-1650DEG C, and then high-aluminum slag is added; and alloying, and specifically, the temperature of tundish molten steel in the continuous casting procedure is 1532 DEG C-1542 DEG C, wherein the time ofa continuous casting billet in a heating furnace is more than or equal to 120 minutes, the initial rolling temperature is 1060 DEG C-1100 DEG C, the finish rolling temperature is 980 DEG C-1020 DEG C,the final rolling temperature is 840 DEG C-880 DEG C, and the coiling temperature is 680 DEG C-720 DEG C. Through component and production process optimization, the non-oriented electrical steel withexcellent performance can be developed.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to the technical field of electrical steel metallurgy. Background technique [0002] With the release of the full text of "Made in China 2025", China's industrial transformation has once again stood on the cusp of the storm, new industrialization, informatization, urbanization, and agricultural modernization are advancing simultaneously, and the potential for ultra-large-scale domestic demand is constantly being released, providing a solid foundation for the development of my country's manufacturing industry. The development of the manufacturing industry is inseparable from the major common needs of innovation and development in the fields of power materials, intelligent manufacturing, additive manufacturing, and new materials. Non-oriented electrical silicon steel occupies an extremely important position in the construction of electrification. In a sense, the amoun...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/06C21C7/10C21D8/12
CPCC21C7/10C21D8/1222C21D2211/005C22C33/06C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06
Inventor 张利民朱立光肖鹏程张利军刘增勋毕燕雷田鹏张彩军张庆军王博王雁周景一孙立根王硕明
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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