Method for reducing strip breakage of oriented silicon steel intermediate annealing

An intermediate annealing, oriented silicon steel technology, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of broken strips, broken lead heads, and difficult leading of oriented silicon steel, so as to reduce the broken strip rate, reduce consumption, The effect of reducing production accident time

Active Publication Date: 2013-10-23
ANGANG STEEL CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] Produced according to the existing process setting, belt breakage accidents often occur when oriented silicon steel is rolled in the first rolling pass and then undergoes intermediate annealing
In particular, the normalized oriented silicon steel may even be difficult to lead when the belt is broken during intermediate annealing.

Method used

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  • Method for reducing strip breakage of oriented silicon steel intermediate annealing

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Embodiment 1

[0014] Example 1. Setting when using a continuous annealing furnace for intermediate annealing of oriented silicon steel: the temperature of the alkali solution in the alkali scrubbing and alkali spraying sections is set at 85°C; the water temperature in the water spraying and water scrubbing sections is controlled at 83°C; the outlet of the alkali washing is dried with hot air The air temperature of the device is set at 110°C; the air temperature of the hot air dryer at the outlet of the annealing furnace is set at 130°C; the output power of the 1-4# fans in the protection gas circulation injection cooling section is set at 70%, and the output power of 5-8# is set at 80%. 9-12# is set at 90%, the temperature of the steel plate before entering the furnace is 58°C, and the temperature of the steel plate after being discharged is 98°C, the specific values ​​are shown in Table 1 below;

Embodiment 2

[0015] Example 2. Setting for intermediate annealing of oriented silicon steel using a continuous annealing furnace: the temperature of the alkali solution in the alkali scrubbing and alkali spraying sections is set at 83°C; the water temperature in the water spraying and water scrubbing sections is controlled at 85°C; the outlet of the alkali washing is dried with hot air The air temperature of the device is set at 120°C; the air temperature of the hot air dryer at the outlet of the annealing furnace is set at 120°C; the output power of the 1-4# fans in the protective gas circulation spray cooling section is set at 65%, and that at 5-8# is set at 80%. 9-12# is set at 90%, the temperature of the steel plate before entering the furnace is 70°C, and the temperature of the steel plate after being discharged is 87°C, the specific values ​​are shown in Table 1 below;

Embodiment 3

[0016] Example 3. Setting for intermediate annealing of oriented silicon steel using a continuous annealing furnace: the temperature of the alkali solution in the alkali scrubbing and alkali spraying sections is set at 85°C; the water temperature in the water spraying and water scrubbing sections is controlled at 85°C; the outlet of the alkali washing is dried with hot air The air temperature of the device is set at 120°C; the air temperature of the hot air dryer at the outlet of the annealing furnace is set at 120°C; the output power of the 1-4# fan in the protective gas circulation spray cooling section is set at 70%, and the output power of 5-8# is set at 75%. 9-12# is set at 90%, the temperature of the steel plate before entering the furnace is 80°C, and the temperature of the steel plate after leaving the furnace is 93°C. The specific values ​​are shown in Table 1 below.

[0017] The setting values ​​of the intermediate annealing process parameters of each embodiment in ta...

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Abstract

The invention provides a method for reducing strip breakage of oriented silicon steel intermediate annealing. The method comprises the following steps of: in the intermediate annealing process of a continuous annealing furnace, ensuring the temperature of a steel plate to be 55-80 DEG C before furnace entrance by raising the alkali-washing-section cleaning and alkali-spray-washing-section alkali liquor temperature of the annealing furnace and air temperature of a hot-air dryer at the outlet of the alkali washing section; and ensuring the temperature of the steel plate after furnace discharge to be 85-100 DEG C by raising the air temperature of the hot-air dryer at the outlet of the annealing furnace and lowering the output power and cooling capacity of a fan at the protective gas cycle injection cooling section. During oriented silicon steel intermediate annealing according to the technical scheme, the strip breakage rate is greatly reduced, the time of causality is lowered, the unit operability is improved, and the consumption is lowered.

Description

technical field [0001] The invention relates to a control method for the intermediate annealing process of oriented electrical steel. Background technique [0002] Silicon is the most important alloying element in electrical steel, and ordinary grain-oriented electrical steel contains about 3% (mass fraction) of Si. Increasing the silicon content in pure iron can reduce iron loss, but with the increase of silicon content, the solid solution strengthening of silicon will significantly increase the room temperature deformation resistance of the steel plate, deteriorate the cold working performance, increase the strength and hardness of the steel, and significantly increase the brittleness, making silicon steel rolling Difficult to manufacture and process. [0003] Since GO oriented steel is produced by secondary cold rolling, an intermediate annealing is performed between two cold rollings to eliminate cold work hardening and complete recrystallization, which is convenient fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/52
Inventor 赵健金文旭姜雨石良李元华吴振宇王祥辉
Owner ANGANG STEEL CO LTD
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