Method for producing high magnetic induction oriented silicon steel strip through batch nitriding

A high magnetic induction orientation, intermittent technology, applied in coating, metal material coating process, solid diffusion coating, etc., can solve the problem of few effective inhibitors, unreasonable distribution structure of precipitated phase, affecting product market competitiveness, etc. question

Active Publication Date: 2013-04-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Continuous nitriding forms less AlN in the nitriding process, the nitrided layer is thin, and the precipitated phase (Fe 6 N 2 、Si 3 N 4 and AlN, etc.) distribution structure is unreasonable, the effective inhibitor formed in the final high temperature annealing process is less, and the inhibitory force is insufficient, resulting in the magnetic properties of the product, especially the low magnetic induction value, which affects the market competitiveness of the product

Method used

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  • Method for producing high magnetic induction oriented silicon steel strip through batch nitriding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Experimental conditions: heat preservation intermittent nitriding method, hot-rolled plate thickness 2.3mm, product thickness 0.23mm, steel composition and weight percentage: C: 0.045%, Si: 3.0%, Mn: 0.05%, Cr: 0.01% , S: 0.003%, Als: 0.02%, N: 0.003%, and the rest are Fe and unavoidable impurities.

[0022] Its steps:

[0023] 1) After smelting and continuous casting, the billet is heated to 1140-1150°C, hot-rolled, normalized, cold-rolled to 0.23mm specification, and decarburized;

[0024] 2) Carry out heat preservation intermittent nitriding: in dry H 2 or N 2 or H 2 with N 2 Three nitriding treatments were carried out under the mixed atmosphere, each nitriding temperature was 760-770°C, each nitriding time was 5 seconds, and the final nitrogen content was controlled at 135PPm; The holding temperature is 760-770°C, and the holding time is 5 seconds each time;

[0025] 3) Natural cooling to room temperature: in dry H 2 or N 2 or N 2 and H 2 cooling in a mixe...

Embodiment 2

[0028] Experimental conditions: Adopt cooling intermittent nitriding method, hot-rolled plate thickness 2.3mm, product thickness 0.23mm, steel composition and weight percentage: C: 0.045%, Si: 3.0%, Mn: 0.05%, Cr: 0.01% , S: 0.003%, Als: 0.02%, N: 0.003%, and the rest are Fe and unavoidable impurities.

[0029] Its steps:

[0030] 1) After smelting and continuous casting, the billet is heated to 1140-1150°C, hot-rolled, normalized, cold-rolled to 0.23mm specification, and decarburized;

[0031] 2) Perform cooling intermittent nitriding: in dry H 2 or N 2 or H 2 with N 2 Carry out nitriding at least three times under mixed atmosphere, each nitriding temperature is 650-660°C, each nitriding time is 3 seconds, and the final nitrogen content is controlled at 142PPm; The cooling time on hold is 3 seconds, and the temperature drop is controlled at 50-55°C each time;

[0032] 3) Natural cooling to room temperature: in dry H 2 or N 2 or N 2 and H 2 cooling in a mixed atmosph...

Embodiment 3

[0035] Experimental conditions: heat preservation intermittent nitriding method, hot-rolled plate thickness 2.3mm, product thickness 0.27mm, steel composition and weight percentage: C: 0.052%, Si: 3.2%, Mn: 0.11%, Cr: 0.048% , S: 0.009%, Als: 0.029%, N: 0.006%, and the rest are Fe and unavoidable impurities.

[0036] Its steps:

[0037] 1) After smelting and continuous casting, the billet is heated to 1180-1190°C, hot-rolled, normalized, cold-rolled to 0.27mm specification, and decarburized;

[0038] 2) Carry out heat preservation intermittent nitriding: in dry H 2 or N 2 or H 2 with N 2 Three nitriding treatments were carried out under the mixed atmosphere, each nitriding temperature was 650-660°C, each nitriding time was 3 seconds, and the final nitrogen content was controlled at 210PPm; The holding temperature is 650-660°C, and the nitriding time is 3 seconds each time;

[0039] 3) Natural cooling to room temperature: in dry H 2 or N 2 or N 2 and H 2 cooling in a mi...

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Abstract

The invention relates to a production method of high magnetic induction oriented silicon steel. The method comprises the following steps: smelting, performing continuous casting, heating a casting billet, performing hot rolling, normalizing, performing cold rolling, and decarburizing; performing heat preservation or cooling batch nitriding; naturally cooling to the room temperature; and performing final high temperature annealing, coating a tensile stress coating, stretching and performing skin rolling for standby. Compared with the prior art, for the 0.27mm high magnetic induction oriented silicon steel product, the average iron loss P1.7 / 50 is reduced from 0.955W / kg to no more than 0.940W / kg and the average magnetic induction B800 is increased from 1.898T to no less than 1.905T; and forthe 0.23mm high magnetic induction oriented silicon steel product, the average iron loss P1.7 / 50 is reduced from 0.885W / kg to no more than 0.860W / kg and the average magnetic induction B800 is increased from 1.895T to no less than 1.903T.

Description

technical field [0001] The invention relates to a production method of oriented silicon steel, specifically belongs to the production method of high magnetic induction oriented silicon steel, and is especially suitable for the production method of improving the magnetic properties of low temperature hot-rolled high magnetic induction oriented silicon steel. Background technique [0002] High magnetic induction grain-oriented silicon steel is widely used in the manufacture of transformer cores, and there are mainly two production methods: high-temperature hot rolling and low-temperature hot rolling. Low-temperature hot-rolled high magnetic induction grain-oriented silicon steel has low production cost, high production efficiency, energy saving and environmental protection, and has become a hot spot in the development and production of grain-oriented steel in the world. [0003] At present, the production process of low-temperature hot-rolled high-magnetism oriented silicon st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C23C8/26
Inventor 许光王若平毛炯辉郭小龙王向欣叶影萍钟祁海史科宾
Owner 武汉钢铁有限公司
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