A method for preventing nodulation of carbon sleeve rolls of continuous annealing furnace

The technology of continuous annealing furnace and carbon sleeve roll is applied in the field of steel rolling technology, which can solve the problems of inability to prevent carbon sleeve roll nodules and influence on production efficiency, and achieve the effects of improving production safety, prolonging service life and improving surface quality.

Active Publication Date: 2021-12-31
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It cannot prevent the formation of nodules on the carbon sleeve roll, and has a great impact on the actual production efficiency

Method used

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  • A method for preventing nodulation of carbon sleeve rolls of continuous annealing furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Normal alkali cleaning, electrolytic cleaning, rinsing and drying are performed on non-oriented silicon steel. After cleaning, wipe the surface of the non-oriented silicon steel with filter paper for 3 seconds, and the surface of the filter paper is free of oil;

[0024] After the non-oriented silicon steel is cleaned, the surface is passivated by a sodium chromate solution with a pH value of 4-6, and then rinsed and dried. The pH value is 4-6. The sodium chromate concentration in the sodium chromate solution is 20g / L, the pH value is 5, and the solution temperature is 45°C;

[0025] After the non-oriented silicon steel is passivated, it is continuously annealed and heated in the open flame heating section. The furnace temperature in the open flame section is 1050 ° C. The open fire section adopts a mixed combustion method of coke oven gas and compressed air;

[0026] The non-oriented silicon steel is kept in the soaking section, the furnace temperature in the soaking ...

Embodiment 2

[0030] Normal alkali cleaning, electrolytic cleaning, rinsing and drying are performed on non-oriented silicon steel. After cleaning, wipe the surface of the non-oriented silicon steel with filter paper for 3 seconds, and the surface of the filter paper is free of oil;

[0031] After the non-oriented silicon steel is cleaned, the surface is passivated by a sodium chromate solution with a pH value of 4-6, and then rinsed and dried. The pH value is 4-6. The sodium chromate concentration in the sodium chromate solution is 30g / L, the pH value is 5, and the solution temperature is 45°C;

[0032] After the non-oriented silicon steel is passivated, it is continuously annealed and heated in the open flame section. The furnace temperature in the open flame section is 1100 ° C. The open fire section adopts a mixed combustion method of coke oven gas and compressed air;

[0033] After the non-oriented silicon steel is heated in the open flame section, it enters the soaking section for he...

Embodiment 3

[0037] Normal alkali cleaning, electrolytic cleaning, rinsing and drying are performed on non-oriented silicon steel. After cleaning, wipe the surface of the non-oriented silicon steel with filter paper for 3 seconds, and the surface of the filter paper is free of oil;

[0038] After the non-oriented silicon steel is cleaned, the surface is passivated by a sodium chromate solution with a pH value of 4-6, and then rinsed and dried. The pH value is 4-6, the sodium chromate concentration in the sodium chromate solution is 30g / L, the pH value is 5, and the solution temperature is 50°C;

[0039] After the non-oriented silicon steel is passivated, it is continuously annealed and heated in the open flame section. The furnace temperature in the open flame section is 1100 ° C. The open fire section adopts a mixed combustion method of coke oven gas and compressed air;

[0040] After the non-oriented silicon steel is heated in the open flame section, it enters the soaking section for he...

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Abstract

The invention provides a method for preventing nodulation of carbon sleeve rolls in a continuous annealing furnace. The method includes: after cold rolling, the non-oriented silicon steel is washed with alkali, rinsed and dried to remove residual oil and iron on the surface of hard rolled coils, and then enter the pH value In 4‑6 sodium chromate solution, surface passivation treatment, rinse and dry. The sodium chromate concentration in the sodium chromate solution with a pH value of 4-6 is 20-50g / L, the pH value is 4-6, and the solution temperature is 35-50°C. A dense passivation film is formed on the surface of the passivated cold-rolled non-oriented silicon steel, which can effectively prevent the oxidation of the surface of the non-oriented silicon steel during the annealing process, thereby preventing the formation of nodules on the carbon rollers in the furnace. The method of the invention can effectively prolong the service life of the carbon sleeve rolls, reduce the occurrence of surface scratches and dent defects caused by nodules on the carbon sleeve rolls, and improve the surface quality of non-oriented silicon steel products. In addition, since the non-oriented silicon steel is not easily oxidized in the annealing furnace, the use of H 2 , greatly reducing the cost of the annealing production process, while improving the safety of the production process.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for preventing nodulation of carbon sleeve rolls in a continuous annealing furnace. Background technique [0002] Non-oriented silicon steel is an important magnetic material for manufacturing various types of motor cores, and is widely used in various types of home appliance compressors, industrial motors, new energy vehicles and other industries. However, during the annealing production process of non-oriented silicon steel, large-area nodulation of hearth rolls often occurs, resulting in scratches and scratches on the surface of non-oriented silicon steel, which affects the uniformity of non-oriented silicon steel insulation coating and the smoothness of the board surface Sexuality, which eventually leads to poor product insulation and poor lamination, and at the same time greatly reduces the service life of the furnace roller and increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/56C23G1/19C23C22/50
CPCC21D1/26C21D1/74C21D9/563C23G1/19C23C22/50
Inventor 吴圣杰李慧陆佳栋岳重祥卢禹龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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