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Hot-rolling method of grain-oriented electrical steel and grain-oriented electrical steel prepared by the method

A oriented electrical steel, oriented technology, applied in the manufacture of inductors/transformers/magnets, circuits, electrical components, etc., can solve problems such as inability to influence and destroy, and achieve the effects of reducing noise, high production efficiency, and improving living environment

Active Publication Date: 2017-12-05
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, the {100} texture in the continuous casting slab will be destroyed by the subsequent hot rolling process, and cannot have a positive impact on the final product of low magnetostriction oriented electrical steel after cold rolling and annealing

Method used

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  • Hot-rolling method of grain-oriented electrical steel and grain-oriented electrical steel prepared by the method
  • Hot-rolling method of grain-oriented electrical steel and grain-oriented electrical steel prepared by the method
  • Hot-rolling method of grain-oriented electrical steel and grain-oriented electrical steel prepared by the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention of this example provides a low magnetostriction and low noise oriented electrical steel hot rolling method and the oriented electrical steel prepared by the method; the method includes:

[0028] After the oriented electrical steel continuous casting slab whose basic composition is Fe-3%Si-1%Mn-0.3%Al-0.05%C-0.002%Bi is taken out from the heating furnace, it is heated at a pass reduction rate of less than 32%. The initial rolling is carried out; when the thickness of the slab is less than 30mm and enters the hot finish rolling processing stage, the temperature of the slab should be lower than 1100°C; then the slab is sent to the hot continuous rolling mill for hot finish rolling. The reduction rate is not less than 85%, and the hot rolling is completed above 850°C; the reduction rate of each pass of the hot finish rolling is not more than 32%; 300°C rate of temperature rise.

[0029] Among them, the analog calculation formula of the noise after the low mag...

Embodiment 2

[0039] Example 2: Choose to process high-grade 27QG95 grain-oriented electrical steel. The slab with a thickness of 22.5 mm and a temperature of 990 ° C is subjected to 5 passes of hot finish rolling to a thickness of about 3 mm; the reduction rate of each pass is kept in the range of 28% to 31%, and the final rolling temperature is 860 ° C; The hot-rolled sheet is heated to 950°C at an average rate of 100°C per minute for ultra-low-speed continuous annealing. After the normalized annealed plate is subjected to subsequent conventional cold rolling and annealing, the iron loss of the finished product is: P1.5 = 0.921W / kg, and the magnetostriction coefficient is l p-p (when the magnetic flux density is 1.7T): 245nm / m ,Such as figure 2 As shown in the graph of its magnetostrictive characteristic, the noise AWV is: 48.7dB (analog A weighting).

Embodiment 3

[0040] Example 3: Choose to process high-grade 27QG95 grain-oriented electrical steel. The slab with a thickness of 26.6 mm and a temperature of 960 ° C is subjected to 5 passes of hot finish rolling to a thickness of about 3 mm; the reduction rate of each pass is kept in the range of 29% to 32%, and the final rolling temperature is 850 ° C; The hot-rolled sheet is heated to 850°C at an average rate of 5°C per minute for bell furnace annealing. After the normalized annealed plate is subjected to subsequent conventional cold rolling and annealing, the iron loss of the finished product is: P1.5=0.927W / kg, and the magnetostriction coefficient is l p-p (when the magnetic flux density is 1.7T): 261nm / m ,Such as image 3 As shown in the graph of its magnetostrictive characteristic, the noise AWV is: 49.1dB (analog A weighting).

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Abstract

The invention relates to an oriented electrical steel hot rolling method and an oriented electrical steel prepared through the method. The method comprises the following steps: taking out oriented electrical steel continuous cast billets from a heating furnace, and carrying out hot blooming cogging under a pass reduction being smaller than 32%; allowing the bloomed slabs with the thickness being smaller than 30mm to enter a hot finishing processing stage, and controlling the temperature of the slabs to be smaller than 1100DEG C; carrying out hot finishing on the slabs with the total reduction being not lower than 85%, and completing hot rolling at a temperature being greater than 850DEG C, wherein the reduction of all passes of the hot finishing does not exceed 32%; and heating according to a rate of 5-300DEG C / min in the heating process of normalizing annealing after the hot rolling. The above technical scheme allows high-grade oriented electrical steel products to maintain original iron loss level and have obviously reduced magnetostriction coefficient, and the noise of transformer iron cores made of the oriented electrical steel prepared in the invention is obviously reduced.

Description

Technical field: [0001] The invention relates to the field of ferrous metal processing, and more specifically relates to a hot rolling method of low magnetostriction and low noise oriented electrical steel and the oriented electrical steel prepared by the method. Background technique: [0002] With the rapid advancement of my country's urbanization process, more and more substations that were previously located in the suburbs appear in the densely populated areas of the city center, and the substations with excessive noise are often complained by surrounding residents. Substation noise is mainly generated by transformers, and the periodic magnetostriction of oriented electrical steel for cores at a working frequency of 50 Hz is the fundamental source of transformer noise, and the greater the magnetostriction coefficient, the greater the corresponding noise. In order to reduce the noise of urban substations, meet the national environmental protection requirements, and improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12H01F41/02
Inventor 程灵马光杨富尧高洁吴雪韩钰陈新李靖
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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