Preparation method of extremely-thin high-magnetic-induction oriented silicon steel belt

A high magnetic induction oriented and oriented silicon steel technology, applied in the field of metallurgical product preparation, can solve the problems of secondary recrystallization instability, etc., achieve the effects of improving processing difficulty, avoiding Gauss orientation deviation, and excellent electromagnetic properties

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

[0029] 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.

[0030] 2) Bell annealing: After degreasing and cleaning the strip steel, coat MgO for bell 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.

[0031] 3) The second cold rolling: after annealing, the steel strip is cold rolled to 0.08mm.

[0032] 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...

Embodiment 2

[0036] 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.

[0037] 2) Bell annealing: After degreasing and cleaning the strip steel, coat MgO for bell 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 for 20 hours, then cool down to below 300°C at a rate of 17°C / h and leave the furnace.

[0038] 3) The second cold rolling: after annealing, the steel strip is cold rolled to 0.05mm.

[0039] 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 ...

Embodiment 3

[0043] 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.

[0044] 2) Bell annealing: After degreasing and cleaning the strip steel, coat MgO for bell 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.

[0045] 3) The second cold rolling: after annealing, the steel strip is cold rolled to 0.02 mm.

[0046] 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...

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Abstract

The invention discloses a preparation method of an extremely-thin high-magnetic-induction oriented silicon steel belt. According to the method, finished oriented silicon steel 0.15-0.35 mm thick is used as the raw material, and the preparation process route includes first-time cold rolling, first-time high-temperature annealing, second-time cold rolling, second-time high-temperature annealing andrefinement of the magnetic domain. Compared with the prior art, the method has the beneficial effects as follows: the problem of difficulty in machining of the extremely-thin oriented silicon steel belt can be solved, the Goss texture inheritance can be guaranteed through matching of the proper cold rolling reduction ratio and annealing process, the magnetic induction B8 of the extremely-thin oriented silicon steel belt can be increased to 1.89-1.94 T, and the extremely-thin oriented silicon steel belt having the excellent electromagnetic performance can be prepared.

Description

technical field [0001] The invention relates to a method for preparing metallurgical products, in particular to a method for preparing an extremely thin strip of high magnetic induction 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D1/26C21D1/76C21D1/09
CPCC21D1/09C21D1/26C21D1/76C21D8/1233C21D8/1266C21D8/1272
Inventor 张静蒋奇武游清雷王晓达宋清阳舒耀李向科庞树芳张海利贾志伟李莉王相龙
Owner ANGANG STEEL CO LTD
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