Preparation method of high-performance oriented silicon steel extremely-thin strip

A technology of oriented silicon steel and ultra-thin strips, which is applied in the field of preparation of high-performance oriented silicon steel ultra-thin strips, can solve problems such as secondary recrystallization instability, achieve the effects of improving processing difficulty, solving processing difficulties, and realizing iron loss

Inactive Publication Date: 2020-11-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that when the strip thickness is reduced below 0.15mm, the secondary recrystallization becomes extremely unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) The first cold rolling: After pickling the 0.35mm finished grain-oriented silicon steel raw material to remove the insulating film and the bottom layer of magnesium silicate, cold rolling to 0.17mm.

[0029] 2) Recrystallization annealing: strip steel in 100% H 2 Under atmosphere, anneal at 920°C for 90s.

[0030] 3) The second cold rolling: after annealing, the steel strip is cold rolled to 0.08 mm.

[0031] 4) Bell-type annealing: After degreasing and cleaning the strip steel, coat MgO for bell-type annealing, pure N 2 In the atmosphere, the temperature was raised to 650°C for 2 hours; in H 2 +N 2 Insulated at 650°C for 10h in a protective atmosphere (wherein H 2 The volume percentage is 75%), the dew point drops to -8°C, and the protective atmosphere is changed to pure H 2 , start to heat up to 960°C at a rate of 50°C / h and keep it warm for 12 hours, then cool down to below 300°C at a rate of 17°C / h.

[0032] 5) Refined magnetic domain: with an energy densit...

Embodiment 2

[0035] 1) The first cold rolling: After pickling the 0.26mm finished grain-oriented silicon steel raw material to remove the insulating film and the bottom layer of magnesium silicate, cold rolling to 0.12mm.

[0036] 2) Recrystallization annealing: strip steel at 80% N 2 +20%H 2 (volume percent) atmosphere, annealing at 950°C for 50s.

[0037] 3) The second cold rolling: after annealing, the steel strip is cold rolled to 0.05mm.

[0038] 4) Bell-type annealing: After degreasing and cleaning the strip steel, coat MgO for bell-type annealing, pure N 2 In the atmosphere, the temperature was raised to 650°C for 1.5 hours; in H 2 +N 2 Insulated at 650°C for 6h in a protective atmosphere (wherein H 2 The volume percentage is 75%), the dew point drops to -2°C, and the protective atmosphere is changed to pure H 2 , start to heat up to 880°C at a rate of 150°C / h and keep it warm for 4 hours, then cool down to below 300°C at a rate of 17°C / h.

[0039] 5) Refined magnetic domain:...

Embodiment 3

[0042] 1) The first cold rolling: After pickling the 0.15mm finished grain-oriented silicon steel raw material to remove the insulating film and the bottom layer of magnesium silicate, cold rolling to 0.05mm.

[0043] 2) Recrystallization annealing: strip steel at 40% N 2 +60%H 2 (volume percent) atmosphere, annealed at 830°C for 200s.

[0044] 3) The second cold rolling: after annealing, the steel strip is cold rolled to 0.02mm.

[0045] 4) Bell-type annealing: After degreasing and cleaning the strip steel, coat MgO for bell-type annealing, pure N 2 In the atmosphere, the temperature was raised to 650°C for 3 hours; in H 2 +N 2 Insulated at 650°C for 15h in a protective atmosphere (wherein H 2 The volume percentage is 75%), the dew point drops to -11°C, and the protective atmosphere is changed to pure H 2 , start to heat up to 1080°C at a rate of 20°C / h and hold at 1080°C for 20 hours, then cool down to below 300°C at a rate of 17°C / h.

[0046] 5) Refining magnetic dom...

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Abstract

The invention discloses a preparation method of a high-performance oriented silicon steel extremely-thin strip. According to the method, finished oriented silicon steel with the thickness ranging from0.15 mm to 0.35 mm is taken as a raw material, and the preparation process route comprises the steps of cold rolling of the first time, recrystallization annealing, cold rolling of the second time, high-temperature annealing and magnetic domain refining. Compared with the prior art, the preparation method has the beneficial effects that the problem that processing of oriented silicon steel extremely-thin strips is difficult can be solved, goss texture inheritance can be guaranteed through matching of the proper cold rolling reduction rate and annealing process, iron losses are reduced by greatly improving the induction B8 of the oriented silicon steel extremely-thin strip to 1.85-1.91 T, and the oriented silicon steel extremely-thin strip excellent in performance is prepared out.

Description

technical field [0001] The invention relates to a method for preparing metallurgical products, in particular to a method for preparing an ultra-thin strip of high-performance oriented silicon steel. Background technique [0002] Oriented silicon steel strip for intermediate frequency is an important raw material in military and electronic industries, mainly used in medium and high frequency transformers, pulse transformers, pulse generators, high-power amplifiers, choke coils for communication, inductance coils, storage and memory components , switching and control elements, magnetic shielding, and transformers operating under vibration and radiation conditions. [0003] For 0.15-0.20mm thin strips, the traditional oriented silicon steel production method is mainly used, and a strong Gaussian texture is obtained through secondary recrystallization. Studies have shown that when the strip thickness is reduced to below 0.15mm, the secondary recrystallization becomes extremely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12
CPCC21D8/1233C21D8/1244C21D8/1272C21D8/1277
Inventor 张静蒋奇武贾志伟张海利李莉王项龙庞树芳王晓达游清雷舒耀李向科宋清阳
Owner ANGANG STEEL CO LTD
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