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An ultra-short process rare earth oriented silicon steel and its preparation method

A technology of oriented silicon steel and rare earth, which is applied in the field of ultra-short process rare earth oriented silicon steel and its preparation, can solve problems such as the difficulty of precipitation of inhibitors of ultra-low carbon component oriented silicon steel, reduce the interface energy, simplify the production process, and refine the solidification structure. Effect

Active Publication Date: 2022-05-17
NORTHEASTERN UNIV LIAONING
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of long preparation process and strict process of conventional grain-oriented silicon steel, and difficulty in precipitation of inhibitors for ultra-low-carbon grain-oriented silicon steel, the present invention provides an ultra-short-flow rare earth grain-oriented silicon steel and its preparation method. The addition of rare earth elements to silicon steel can not only promote the precipitation of inhibitors, but also refine the solidification structure and improve the uniformity of the structure

Method used

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preparation example Construction

[0023] The preparation method of the above-mentioned ultra-short process rare earth oriented silicon steel includes: molten steel smelting process, thin strip continuous casting process, cold rolling process and recrystallization annealing process;

[0024] Molten steel smelting process: molten steel is smelted according to the set composition, the chemical composition and its weight percentage are Si: 2.0-4.5%, C: ≤0.003%, Y: 0.001-0.05%, Mn: 0.15-0.35%, Al: 0.03-0.04 %, Cu: 0-0.5%, S: 0.025-0.04%, N: 0.011-0.013%, the rest is Fe and unavoidable impurity elements;

[0025] Strip continuous casting process: the molten steel enters the tundish through the gate, the tundish preheating temperature is 1200-1250°C, and then the molten steel in the tundish flows into the molten pool formed by the crystallization roller and the side sealing plate through the gate, and finally solidifies rapidly Become a casting belt with a thickness of 2-2.5mm; control the superheat in the molten poo...

Embodiment 1

[0032] A method for preparing ultra-short-flow rare-earth grain-oriented silicon steel is carried out in the following steps:

[0033] Molten steel smelting: molten steel is smelted according to the set composition. According to the characteristics of thin strip continuous casting, the composition system of ultra-low carbon oriented silicon steel is selected. The composition is Si: 4.2%, C: 0.0028%, Y: 0.001%, Mn: 0.34 %, Al: 0.037%, Cu: 0.45%, S: 0.038%, N: 0.012%, and the rest are Fe and unavoidable impurity elements;

[0034]Strip continuous casting: molten steel enters the tundish through the gate, the preheating temperature of the tundish is 1200°C, the molten steel in the tundish flows into the molten pool formed by the crystallization roller and the side sealing plate through the gate, and the molten steel finally solidifies rapidly to become 2.5 mm thickness cast strip. Control the superheat in the molten pool to 20°C, control the liquid level in the molten pool to 15...

Embodiment 2

[0040] A method for preparing ultra-short-flow rare-earth grain-oriented silicon steel is carried out in the following steps:

[0041] Molten steel smelting: molten steel is smelted according to the set composition. According to the characteristics of thin strip continuous casting, the composition system of ultra-low carbon oriented silicon steel is selected. The composition is Si: 3.6%, C: 0.002%, Y: 0.005%, Mn: 0.28 by weight percentage %, Al: 0.036%, Cu: 0.39%, S: 0.033%, N: 0.012%, and the rest are Fe and unavoidable impurity elements;

[0042] Strip continuous casting: the molten steel enters the tundish through the gate, the tundish preheating temperature is 1200°C, the molten steel in the tundish flows into the molten pool formed by the crystallization roller and the side sealing plate through the gate, and the molten steel finally solidifies rapidly to become 2.3 mm thickness cast strip. Control the superheat in the molten pool to 20°C, control the liquid level in the...

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Abstract

The invention belongs to the field of metallurgy technology, and relates to an ultra-short process rare earth oriented silicon steel and a preparation method thereof. The chemical composition and weight percentage thereof are Si: 2.0-4.5%, C: ≤0.003%, Y: 0.001-0.05%, Mn: 0.15-0.35%, Al: 0.03-0.04%, Cu: 0-0.5%, S: 0.025-0.04%, N: 0.011-0.013%, and the rest are Fe and unavoidable impurity elements. The preparation process includes: molten steel smelting, strip continuous casting, cold rolling, and recrystallization annealing. Compared with conventional production methods, continuous casting, rough rolling, hot continuous rolling, normalization and decarburization annealing are eliminated, which greatly simplifies the production process. By adding the rare earth element yttrium, the precipitation of the inhibitor is promoted, and the solidification structure of the thin strip continuous casting silicon steel is significantly refined, the uniformity of the structure is improved, uniform and fine equiaxed grains are obtained, and the performance of the grain-oriented silicon steel is optimized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to an ultra-short-flow rare-earth oriented silicon steel and a preparation method thereof. Background technique [0002] Grain-oriented silicon steel is the most widely used transformer core material. The improvement of its magnetic properties plays an irreplaceable role in the development of industries such as electric power, electronics and national defense. It is also a steel product with high added value and strategic significance. At the same time, the preparation process of oriented silicon steel is extremely long and the process requirements are extremely strict, mainly including: smelting - continuous casting - slab heating - hot rolling - normalization - cold rolling - decarburization annealing - high temperature annealing, etc. Therefore, it is extremely important to study the basic application research of short-process, green, and high-efficiency preparation of high-perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/16B22D11/06C21D1/26C21D1/74C21D8/12C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/005C22C38/001C22C38/16C22C33/04B22D11/06C21D8/1233C21D8/1244C21D1/26C21D1/74Y02P10/20
Inventor 王顺王洋张元祥方烽袁国李振垒康健王超张晓明王国栋
Owner NORTHEASTERN UNIV LIAONING