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Electrical steel annealing and heating support method

A supporting method and technology of electrical steel, applied in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve problems such as surface damage of annealed steel strips, achieve high grades, reduce damage or nodules, and achieve high magnetic properties

Active Publication Date: 2015-08-12
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 (6) made of material (graphite) or ceramics severely damages the surface of the annealed steel strip

Method used

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  • Electrical steel annealing and heating support method
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  • Electrical steel annealing and heating support method

Examples

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Effect test

Embodiment 1

[0033] see figure 1 , the cold-rolled steel strip is heated to the annealing temperature between the heating section 3 and the soaking section 4 in the continuous annealing furnace for silicon steel, and is kept for a certain period of time before entering the subsequent cooling section, and then reaches room temperature after cooling. The length of the steel strip in the horizontal annealing furnace is very long, and under the fixing of the entrance and exit support rollers 6, the steel strip in the horizontal state will sag due to the effect of gravity. The amount of sag is related to the distance, tension and weight of the two support points. Use the plasma jet levitation device as a support to reduce the overhang of the strip. The number of plasma jet levitation devices is set according to the length of the furnace, the flow rate and pressure of the gas generated by the plasma jet levitation device, and the required droop.

[0034] A mixture of hydrogen and nitrogen is u...

Embodiment 2

[0039] see figure 2 , the cold-rolled steel strip is heated to the annealing temperature between the heating section 3 and the soaking section 4 in the continuous annealing furnace for silicon steel, and is kept for a certain period of time before entering the subsequent cooling section, and then reaches room temperature after cooling. The length of steel band in horizontal annealing furnace is very long, and support roll 6 is installed in entrance, middle and outlet, and the steel band of horizontal state between support roll 6 will sag due to the effect of gravity. Simultaneously steel belt weight is when steel belt sags, forms certain pressure to support roller 6. The size of the pressure on the back-up rolls 6 is related to the thickness of the steel strip, the distance between the back-up rolls 6, and the tension. The plasma jet suspension device is used as an auxiliary support to reduce the hanging amount of the strip and reduce the pressure on the support roller 6. T...

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Abstract

The invention discloses an electrical steel annealing and heating support method which comprises a furnace body (2), wherein the furnace body (2) comprises a heating zone (3), a soaking zone (4), a support roller (6) and a plasma nozzle (5); the heating zone (3) and the soaking zone (4) are used for annealing a steel strip; the support roller (6) is used for supporting the steel strip in the furnace body (2); the plasma nozzle (5) is used for ejecting a gas from the steel strip and supporting the steel strip; and the steel strip is separated from the support roller (6) in the annealing process and is kept suspended through the plasma nozzle (5), so that damages or nodulation to the support roller (6) in the heating process can be avoided or relieved; and high-silicon and high-grade electrical steel with high magnetic properties (low iron loss and relatively high grade) and excellent surface quality is obtained.

Description

technical field [0001] The invention belongs to the technical field of electrical steel processing equipment, and in particular relates to an annealing heating support 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 formation of carbon monoxide from carbon in the steel through the presence of water vapor in a reducing atmosphere, remove excess carbon from the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/63C21D1/26
Inventor 裴英豪裴陈新占云高夏雪兰
Owner MAGANG (GROUP) HOLDING CO LTD
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