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A high-efficiency production method of semi-process non-oriented electrical steel

A technology of oriented electrical steel and production method, which is applied in the field of high-efficiency production of semi-process non-oriented electrical steel, and can solve problems such as low rolling speed, fast cooling speed, and environmental pollution

Active Publication Date: 2017-10-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many disadvantages in the production of hot-rolled silicon steel sheets: it is easy to cause lamination bonding during high-temperature lamination rolling, and the amount of waste products is large; the rolling speed is low, the hot-rolled pieces are thin, the cooling speed is fast, and the temperature is difficult to control; the rolling is lubricated with asphalt, Large oily smoke, polluting the environment, etc.
[0004] Conventional cold-rolled non-oriented electrical steel semi-process products also adopt bell furnace annealing process. In this process, the entire steel coil is erected and heated at high temperature, and bonding and skirting will occur. In order to prevent this phenomenon, the steel plate needs to be flattened. In addition, both the upper and lower surfaces need to be textured. Although this process improves the electromagnetic properties of the product, the product has a poor shape, and the upper and lower surfaces have high roughness, which affects the quality of the product stack.

Method used

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  • A high-efficiency production method of semi-process non-oriented electrical steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Continuous casting is used to cast molten steel into billets and hot-roll to 2.1mm;

[0016] 2. Cold rolled to 0.54mm after pickling;

[0017] 3. Continuous furnace annealing is adopted after cold rolling, and N 2 +H 2 Atmosphere protection, N 2 : 60%; the rest is H 2 ;The temperature of the soaking section of the annealing furnace is 760°C, and the temperature is kept for 70s;

[0018] 4. Cumulative leveling, on the basis of one uncoiler and one coiler at the entrance and exit of the original leveling process, one more uncoiler and one coiler are added, and two coils of the same specification and composition are selected. The amount of deformation (critical deformation 4.6%) is superimposed together for leveling, the tension is controlled at 3KN, the final thickness of the product is 0.515mm, and each is coiled after leveling;

[0019] 5. The coating is made into a finished product;

[0020] 6. Box furnace annealing, simulating user stress relief annealing, te...

Embodiment 2

[0022] 1. Continuous casting is used to cast molten steel into billets and hot-roll to 2.2mm;

[0023] 2. Cold rolled to 0.55mm after pickling;

[0024] 3. Continuous furnace annealing is adopted after cold rolling, and N 2 +H 2 Atmosphere protection, N 2 : 70%; H 2 : 30%; the temperature of the soaking section of the annealing furnace is 780°C, and the temperature is kept for 60s;

[0025] 4. Accumulative leveling, add 2 sets of uncoilers and 2 sets of coilers at the entrance and exit of the original leveling process, select three coils of the same specification and composition, and then superimpose with a small deformation (critical deformation 9%) Flatten together, the tension is controlled at 2.5KN, and the final thickness of the product is 0.5mm;

[0026] 5. The coating is made into a finished product;

[0027] 6. Box furnace annealing, simulating user stress relief annealing, temperature 750°C, heat preservation 2h.

Embodiment 3

[0029] 1. Continuous casting is used to cast molten steel into billets and hot-roll to 2.3mm;

[0030] 2. Cold rolled to 0.53mm after pickling;

[0031] 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 800°C, and the temperature is kept for 50s;

[0032] 4. Accumulative leveling, add 3 uncoilers and 3 coilers at the entrance and exit of the original leveling process, select four coils of the same specification and composition, and then superimpose with a small deformation (critical deformation 3%) Flatten together, the tension is controlled at 4KN, and the final thickness of the product is 0.507mm;

[0033] 5. The coating is made into a finished product;

[0034] 6. Box furnace annealing, simulating user stress relief annealing, temperature 750°C, heat preservation 2h.

[0035] The performance of the product obtained according ...

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Abstract

The invention discloses a high-efficiency production method of semi-process non-oriented electrical steel, including molten iron desulfurization-converter smelting-RH refining-continuous casting-hot rolling-pickling-cold rolling-continuous furnace annealing-cumulative leveling-coating-performance inspection -Packaging, casting molten steel into billets by continuous casting, hot rolling to 1.0-3.0mm; cold rolling to 0.3-0.7mm after pickling; continuous furnace annealing after cold rolling, using N2+H2 protection, N2: 10-100 %; the rest is H2; the temperature in the soaking section is 500-900°C, and the heat preservation is 30-100s; the accumulative leveling is to add an uncoiler and a coiler at the entrance and exit of the existing leveling process, and select two coils of the same specification and composition. The critical deformation of 1-10% of the deformation is accumulated smoothly, and the tension is controlled at 1-10KN.

Description

technical field [0001] The invention relates to a production method of electrical steel products, in particular to a high-efficiency production method of semi-process non-oriented electrical steel. Background technique [0002] Due to the requirements of high efficiency and low loss of motors, cold-rolled non-oriented electrical steel not only requires low iron loss, but also has high magnetic induction and high punchability. After optimizing the composition and process of cold-rolled non-oriented electrical steel produced by conventional processes, it is difficult to improve the electromagnetic properties of the product. [0003] The cumulative stack rolling process is usually only applied to the thin plate hot rolling process (0.5-1.0mm), such as hot-rolled silicon steel. There are many disadvantages in the production of hot-rolled silicon steel sheets: it is easy to cause lamination bonding during high-temperature lamination rolling, and the amount of waste products is l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/12
Inventor 高振宇李亚东张智义金文旭陈春梅胡洪旭张仁波马金芬李文权刘文鹏
Owner ANGANG STEEL CO LTD