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Preparation method of thin-gauge non-oriented silicon steel with high magnetic induction and low iron loss based on thin strip continuous casting

A technology of oriented silicon steel and high magnetic induction, applied in the field of metallurgy, can solve the problems of hindered industrial production and poor processing performance of high silicon steel, and achieve the effects of improving the uniformity of the structure, improving the formability and improving the yield.

Active Publication Date: 2018-08-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few research reports on the production of non-oriented silicon steel strips by continuous casting of thin strips. Only CN104451372 and CN103060701 report a production method of high-silicon non-oriented silicon steel sheets. In view of the poor processability of high-silicon steels, its industrial production will will be hindered

Method used

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  • Preparation method of thin-gauge non-oriented silicon steel with high magnetic induction and low iron loss based on thin strip continuous casting
  • Preparation method of thin-gauge non-oriented silicon steel with high magnetic induction and low iron loss based on thin strip continuous casting
  • Preparation method of thin-gauge non-oriented silicon steel with high magnetic induction and low iron loss based on thin strip continuous casting

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Effect test

Embodiment 1

[0035] In this embodiment, according to the chemical composition (mass percentage) C 0.004%, Si 2.9%, Mn 0.005%, Al 0.15%, P 0.03%, S 0.003%, N 0.003%, O 0.003%, the rest is Fe and not Avoid impurities and smelt molten steel. The molten steel casting temperature is controlled at 1530°C, cast and rolled into a 2.2mm thick cast strip by a thin strip continuous casting machine, and the casting speed is 8m / min. After the cast strip comes out of the roll, it is cooled to 720°C at a speed of about 30°C / s for curling, and then cooled to room temperature. The proportion of columnar crystals in the cast strip is 73%. After being pickled with 110g / L hydrochloric acid at 75°C, warm rolling is carried out three times. The warm rolling temperature is 200°C, the total reduction rate is 45%, and the pass reduction is 14-17%. Then carry out two passes of cold rolling, the total reduction rate is 42%, and the pass reduction rate is 18-24%. then in N 2Intermediate annealing was carried out a...

Embodiment 2

[0038] In this embodiment, according to the chemical composition (mass percentage) C 0.003%, Si 3.0%, Mn 0.1%, Al 0.2%, P 0.03%, S 0.003%, N 0.003%, O 0.003%, the rest is Fe and cannot Avoid impurities and smelt molten steel. The casting temperature of the molten steel is controlled at 1530°C, cast and rolled into a 2.0mm thick cast strip with a thin strip continuous casting machine, and the casting speed is 7m / min. After the cast strip comes out of the roll, it is cooled to 700°C at a speed of about 30°C / s for curling, and then cooled to room temperature. The proportion of columnar crystals in the cast strip is 75%. After being pickled with 110g / L hydrochloric acid at 75°C, warm rolling is carried out three times. The warm rolling temperature is 200°C, the total reduction rate is 50%, and the reduction amount of each pass is 15-20%. Then carry out three passes of cold rolling, the total reduction rate is 53%, and the pass reduction rate is 15-23%. then in N 2 Intermediate ...

Embodiment 3

[0041] In this embodiment, according to the chemical composition (mass percentage) C 0.004%, Si 2.8%, Mn 0.04%, Al 0.4%, P 0.04%, S 0.003%, N 0.003%, O 0.003%, the rest is Fe and cannot Avoid impurities and smelt molten steel. The molten steel casting temperature is controlled at 1540°C, cast and rolled into a 2.1mm thick cast strip by a thin strip continuous casting machine, and the casting speed is 10m / min. After the cast strip comes out of the roll, it is cooled to 740°C at a speed of about 30°C / s for curling, and then cooled to room temperature. The proportion of columnar crystals in the cast strip is 79%. After pickling with 140g / L hydrochloric acid at 80°C, three passes of warm rolling are carried out. The warm rolling temperature is 200°C, the total reduction rate is 47%, and the pass reduction is 14-19%. Then carry out three passes of cold rolling, the total reduction rate is 68%, and the pass reduction rate is 15-25%. then in N 2 Intermediate annealing was carried ...

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Abstract

The invention belongs to the field of metallurgical technology, and particularly relates to a method for preparing thin-gauge non-oriented silicon steel with high magnetic induction and low iron loss based on thin strip continuous casting. In terms of mass percentage, the composition of the molten steel is: C≤0.005%, Si 2.6~3.2%, Mn 0.005~0.3%, Al 0.1~0.5%, P 0.005~0.05%, S≤0.003%, N≤0.003% , O≤0.003%, the balance is Fe and inevitable impurities. The thickness of non-oriented silicon steel is 0.10~0.20mm, and its preparation methods include: smelting, thin strip casting, pickling, warm rolling, two-stage cold rolling, finished product annealing and coating treatment. This invention is based on the twin-roller thin strip continuous casting technology, which eliminates the conventional slab reheating and hot rolling processes. By controlling the proportion of columnar crystals in the cast strip and the reduction amount of warm rolling and cold rolling, it enhances the advantageous { 100} and {110}<001> texture, improve plate shape and tissue uniformity, and improve magnetic properties. The invention has short process flow, low energy consumption, high magnetic induction and low iron loss of the product.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing non-oriented silicon steel with high magnetic induction and low iron loss and thin specifications based on thin strip continuous casting. Background technique [0002] Non-oriented silicon steel is an important iron core material for motors and engines. With the development of frequency conversion technology, people put forward higher performance requirements for non-oriented silicon steel sheets. For traction motors, the internal non-oriented silicon steel not only requires low iron loss (especially low iron loss at high frequency) to improve motor efficiency, but also requires high magnetic induction to enhance torque. At high frequencies, eddy current loss accounts for the main part of iron loss, and its value is proportional to the square of the material thickness. Therefore, the most effective way to reduce the loss of silicon steel is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/12B22D11/06
CPCB22D11/06C21D8/1211C21D8/1227C21D8/1233C21D8/1272C22C38/004C22C38/02C22C38/04C22C38/06
Inventor 许云波焦海涛张元祥方烽卢翔曹光明李成刚
Owner NORTHEASTERN UNIV LIAONING
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