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A kind of electric steel annealing heating method

A heating method and technology for electrical steel, applied in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve problems such as surface damage of annealed steel strips, low induction heating efficiency, and sensitive internal stress, so as to reduce iron loss and improve magnetic properties performance, good surface quality

Active Publication Date: 2017-11-03
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the magnetic properties of electrical steel are very sensitive to internal stress, and the annealing process requires ensuring low internal stress, so the high temperature part of the continuous annealing furnace prohibits the steel strip from turning The rollers cause the strip to bend creating stress
[0005] Since the annealing of high-silicon electrical steel needs to go through high humidity and high temperature environment, the surface of the steel is oxidized, and then reduced under high hydrogen atmosphere and high temperature conditions, the steel surface is very soft, and it is very easy to adhere to carbon under high temperature and self-weight conditions. The surface of the back-up roll made of material (graphite) or ceramics severely damages the surface of the annealed steel strip
[0006] There are many ways to heat at high temperature. Electrical steel becomes a non-ferromagnetic material at high temperature, and the efficiency of induction heating is very low.
[0007] Increase the temperature of the heating section and the soaking section, and put forward higher heat resistance requirements for the heating element or related components, which is also very difficult to achieve

Method used

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  • A kind of electric steel annealing heating method
  • A kind of electric steel annealing heating method
  • A kind of electric steel annealing heating method

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Effect test

Embodiment 1

[0031] see figure 1 , a kind of electric steel annealing heating method, comprises furnace body 2, has in the furnace body 2:

[0032] A heating section 3 and a soaking section 4 for annealing the steel strip 1;

[0033] Support rollers 6 supporting the steel strip 1 in the furnace body 2;

[0034] Installed in the soaking section 4, a reheating device 5 for reheating the steel strip 1;

[0035] The annealing heating process comprises the following steps:

[0036] 1) The steel strip 1 is heated to the annealing temperature and kept warm during the heating section 3 and the soaking section 4 in the annealing furnace;

[0037] 2) During the annealing process of the steel strip 1, when the steel strip 1 runs to the reheating device 5, the reheating device 5 reheats the steel strip 1;

[0038] 3) After that, the steel strip 1 enters the cooling section of the furnace body 2 and is cooled to room temperature.

[0039] The reheating device 5 reheats the steel strip 1, so that t...

Embodiment 2

[0063] Such as Figure 4 and 5 Shown is a schematic structural view of the second embodiment of the reheating device 5 .

[0064] Among them, the reheating device has:

[0065] The electrode group arranged on the surface of the steel strip 1 includes two electrodes, and the two electrodes are respectively connected to two ends of the power supply.

[0066] The upper surface and the lower surface of the steel strip 1 are respectively provided with a set of electrode groups, namely the first electrode group and the second electrode group.

[0067] A gas supply pipe capable of ejecting gas is arranged between the two electrodes of the electrode group.

[0068] The distance between the two electrodes of the electrode group is adjustable, and the relative position between the electrode group and the steel strip 1 is adjustable. The adjustment of the distance between the electrodes can adjust the heating power density of the hydrogen plasma to the steel strip 1 between the elect...

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Abstract

The invention discloses an annealing heating method for electrical steel, which uses high-temperature plasma local heating to complete the recrystallization of the electrical steel strip (1) at a higher temperature, and at the same time has low requirements for other parts in the annealing furnace, realizing the requirement for the annealing furnace There is no higher temperature resistance requirement, and higher temperature annealing can be completed, and electrical steel with lower iron loss can be obtained under the same metallurgical quality of the steel. At the same time the surface quality is good.

Description

technical field [0001] The invention belongs to the technical field of electrical steel processing equipment, and in particular relates to an annealing heating method for electrical steel. Background technique [0002] The large-scale continuous production of cold-rolled high-grade electrical steel is realized by increasing the Si and Al content of the steel, reducing the impurity elements of the steel, reasonable hot rolling and providing continuous annealing (high temperature). The higher the grade of high-grade electrical steel, the lower the iron loss. Iron loss reduction, cold rolling annealing temperature increase is an essential means. [0003] The annealing of cold-rolled non-oriented electrical steel is realized in a continuous annealing furnace. The function of the continuous annealing furnace can realize the removal of excess carbon from the steel and the high annealing temperature to achieve the required recrystallization under the reducing atmosphere through t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D9/56C21D1/26
Inventor 裴陈新裴英豪王立涛丰慧
Owner MAGANG (GROUP) HOLDING CO LTD