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Production method for semi-processed electrical steel

A technology of semi-process electrical steel and production method, which is applied in the production field of semi-process cold-rolled non-oriented electrical steel, can solve problems such as unfavorable product deep processing, reduce product lamination coefficient, etc. Glitch increase effect

Inactive Publication Date: 2016-07-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For cold-rolled non-oriented electrical steel, if the roughness of the upper and lower surfaces of the steel plate can be improved, the adhesion of the coating can be improved, but the lamination coefficient of the product will be reduced, which is not conducive to the deep processing of the product.

Method used

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  • Production method for semi-processed electrical steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Continuous casting is used to cast molten steel into billets and hot-roll to 2.15mm;

[0013] 2. Cold rolled to 0.54mm after pickling;

[0014] 3. Continuous furnace annealing is adopted after cold rolling, and N 2 +H 2 Atmosphere protection, N 2 : 65%; the rest is H 2 ;The temperature of the soaking section of the annealing furnace is 750°C, and the temperature is kept for 55s. The matrix structure has just undergone recrystallization, and the nucleation is uniform;

[0015] 4. Leveling, the reduction rate is 8%, the roughness Ra of the leveling roll on the leveling machine is: 2.0μm, the tension is controlled at 3KN, and the product thickness is 0.495mm;

[0016] 5. The coating is made into a finished product;

[0017] 6. Box furnace annealing, simulating user stress relief annealing, temperature 750°C, heat preservation 2h.

Embodiment 2

[0019] 1. Continuous casting is used to cast molten steel into billets and hot-roll to 2.2mm;

[0020] 2. Cold rolled to 0.55mm after pickling;

[0021] 3. Continuous furnace annealing is adopted after cold rolling, and N 2 +H 2 Atmosphere protection, N 2 : 70%; the rest is H 2 ;The temperature of the soaking section of the annealing furnace is 780°C, and the temperature is kept for 60s. The matrix structure has just undergone recrystallization, and the nucleation is uniform;

[0022] 4. Leveling, the reduction rate is 9%, the roughness Ra of the leveling roll on the leveling machine is: 2.5μm, the tension is controlled at 3KN, and the product thickness is 0.5mm;

[0023] 5. The coating is made into a finished product;

[0024] 6. Box furnace annealing, simulating user stress relief annealing, temperature 750°C, heat preservation 2h.

Embodiment 3

[0026] 1. Continuous casting is used to cast molten steel into billets and hot roll to 2.25mm;

[0027] 2. Cold rolled to 0.57mm after pickling;

[0028] 3. Continuous furnace annealing is adopted after cold rolling, and N 2 +H 2 Atmosphere protection, N 2 : 75%; the rest is H 2 ;The temperature of the soaking section of the annealing furnace is 790°C, and the temperature is kept for 65s. The matrix structure has just undergone recrystallization, and the nucleation is uniform;

[0029] 4. Leveling, the reduction rate is 13%, the roughness Ra of the leveling roll on the leveling machine is: 3.0μm, the tension is controlled at 4KN, and the product thickness is 0.493mm;

[0030] 5. The coating is made into a finished product;

[0031] 6. Box furnace annealing, simulating user stress relief annealing, temperature 750°C, heat preservation 2h.

[0032] The performance of the product obtained according to the above process is as follows:

[0033]

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Abstract

The invention discloses a production method for semi-processed electrical steel. The production method comprises the steps of molten iron desulphurization, converter smelting, RH refining, continuous casting, hot rolling, acid pickling, cold rolling, continuous annealing furnace annealing, stretching and flattening, coating manufacturing, performance examining and packaging. Specifically, molten steel is cast into blanks in a continuous casting mode and the blanks are hot-rolled to 2.0-2.5 mm; the blanks are cold-rolled to 0.6-0.5 mm after being subjected to acid pickling, and the reduction rate is 60-90%; continuous furnace annealing is carried out after cold rolling and the N2 and H2 atmosphere is adopted for protection, wherein N2 accounts for 30-80% in the N2 and H2 atmosphere and the balance is H2; the soaking zone temperature of an annealing furnace ranges from 600 DEG C to 800 DEG C and is preserved for 30-80 seconds; the thickness of products subjected to stretching and flattening ranges from 0.6mm to 0.4mm, the reduction rate is 6-15%, the roughness Ra of a flattening roller on a flattening machine ranges from 2.0 micrometers to 3.0 micrometers and the tension is controlled within 2-5 KN.

Description

technical field [0001] The invention relates to a production method of semi-process electrical steel, in particular to a production method of semi-process cold-rolled non-oriented electrical steel. Background technique [0002] The cold-rolled non-oriented electrical steel products obtained by the conventional whole process are prone to poor riveting due to the surface quality of the steel plate during the deep processing of the user, the coating falls off after stress relief annealing, and the matrix structure is not easy to grow, which affects the user's use . [0003] At present, the method of improving the surface roughness of steel sheets is only applied to cold-rolled products such as galvanized sheets and automobile sheets, and is rarely applied to cold-rolled non-oriented electrical steel products, because these products do not require lamination and do not pay attention to the electromagnetic properties of the products , Therefore, increasing the roughness in cold-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/06
Inventor 高振宇李亚东张智义金文旭陈春梅胡洪旭张仁波罗理李文权刘文鹏
Owner ANGANG STEEL CO LTD
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