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Low-grade non-oriented electrical steel and manufacturing method thereof

A technology of grain-oriented electrical steel and a manufacturing method, applied in the direction of temperature control, etc., can solve the problems of poor rolling stability of low-grade non-oriented electrical steel, affecting the size and shape accuracy of hot-rolled coils of low-grade non-oriented electrical steel, etc. Improves dimensional and shape accuracy, and stabilizes the effect of finishing rolling

Active Publication Date: 2021-10-29
SHOUGANG ZHIXIN QIAN AN ELECTROMAGNETIC MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a low-grade non-oriented electrical steel and its manufacturing method to solve or partially solve the problem of poor rolling stability of low-grade non-oriented electrical steel, which affects the size and plate size of hot-rolled coils of low-grade non-oriented electrical steel. The technical problem of type precision

Method used

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  • Low-grade non-oriented electrical steel and manufacturing method thereof
  • Low-grade non-oriented electrical steel and manufacturing method thereof
  • Low-grade non-oriented electrical steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The scheme provided by the present invention is applied to 50W1000, and a certain batch is rolled 22 coils altogether, and its process control is as follows:

[0044] Al element content: 0.9% to 1.1%;

[0045] Slab temperature control: 1153~1172℃;

[0046] Rough rolling RT2 temperature control: 1027~1043℃;

[0047] Temperature control of finish rolling and finishing rolling: 907~932℃;

[0048] After the hot rolling is completed, the size and shape qualification rate of the coil are counted, and the magnetic properties are tested according to the requirements of GB / T 2521.1-2016.

Embodiment 2

[0050] The scheme provided by the present invention is applied to 50W800, and a certain batch is rolled 32 volumes altogether, and its process control is as follows:

[0051] Al element content: 1.4% to 1.6%;

[0052] Slab temperature control: 1164~1198℃;

[0053] Rough rolling RT2 temperature control: 1008~1038℃;

[0054] Temperature control of finish rolling and finishing rolling: 901~938℃;

[0055] After the hot rolling is completed, the size and shape qualification rate of the coil are counted, and the magnetic properties are tested according to the requirements of GB / T 2521.1-2016.

Embodiment 3

[0057] The scheme provided by the present invention is applied to 50W1300, and a certain batch is rolled 30 volumes altogether, and its process control is as follows:

[0058] Al element content: 0.6% to 1.0%;

[0059] Slab temperature control: 1151~1179℃;

[0060] Rough rolling RT2 temperature control: 1021~1047℃;

[0061] Temperature control of finish rolling and finishing rolling: 901~938℃;

[0062] After the hot rolling is completed, the size and shape qualification rate of the coil are counted, and the magnetic properties are tested according to the requirements of GB / T 2521.1-2016.

[0063] Corresponding to Embodiments 1 to 3, the historical steel coil production data before applying the scheme of the present invention are counted, specifically as follows:

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Abstract

The invention discloses a manufacturing method of low-grade non-oriented electrical steel. The method comprises the following steps of during steelmaking, increasing the content of an aluminum element in a plate blank of the low-grade non-oriented electrical steel by 0.08 to 0.12 weight percent; during the hot-rolled plate blank heating, controlling the tapping temperature of the plate blank to be 1150-1200 DEG C; and during hot rolling and rough rolling, controlling the rough rolling RT2 temperature of the plate blank to be 1000 to 1050 DEG C. According to the method, the phase transition temperature of the low-grade non-oriented electrical steel is increased by increasing the aluminum content; and the low-grade non-oriented electrical steel is enabled not to generate rolling force fluctuation due to rolling of a phase transition region in the finish rolling process by combining the tapping temperature control and the rough rolling RT2 temperature control of the plate blank, so that the finish rolling process is stabilized, and the size and plate shape precision of a low-grade non-oriented electrical steel plate coil after finish rolling are improved.

Description

technical field [0001] The present application relates to the technical field of electrical steel, in particular to a low-grade non-oriented electrical steel and a manufacturing method thereof. Background technique [0002] In the production process of low-grade electrical steel, there are mainly four production processes: steelmaking, hot rolling, continuous cold rolling, and annealing. The process stability of steelmaking and hot rolling directly affects the stability of low-grade product performance. For low-grade non-oriented electrical steel, due to the characteristics of its hot rolling process, the rolling stability often decreases, which increases the fluctuation of the size, shape and rolling temperature of the hot-rolled electrical steel sheet. The rolling process cannot be compensated, which eventually leads to large fluctuations in the size and performance of the finished product of low-grade electrical steel, which reduces the stability of the user's use and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/12B21B37/74
CPCC22C38/06C21D8/1222B21B37/74
Inventor 李盈程林刘玉金张保磊胡志远周晓琪侍爱臣马琳
Owner SHOUGANG ZHIXIN QIAN AN ELECTROMAGNETIC MATERIALS CO LTD
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