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Method of manufacturing grain-oriented electrical steel sheets

A technology of grain orientation and electrical steel sheet, which is applied in a field related to the production of grain orientation electrical steel sheet, can solve the problems of small grain size, high production cost, and roughness of the primary recrystallized steel sheet, and achieve excellent magnetic properties , less iron loss, and high magnetic flux density

Active Publication Date: 2009-10-28
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that a product with a high magnetic flux density can be obtained, but its problem is that the production cost is increased due to the cold rolling twice and the use of expensive Sb or Se as an inhibitor. The toxicity of the above elements makes the operability of this method relatively poor
[0008] When the slab is heated to a high temperature for a long time, as described above, the following problems arise: the production cost increases due to the use of a large amount of heat, and, since the surface of the slab flows down molten steel in a molten state, thereby Resulting in expensive reheat furnace repairs and shortened heating equipment life
[0016] However, this method has a problem in that due to simultaneous decarburization and nitriding, the resulting primary recrystallized steel sheet has a smaller grain size compared to the method of first decarburization followed by nitriding
[0019] However, if B is added, since B and C tend to form a very rough compound, it is difficult to obtain a uniform and stable inhibitory ability
On the other hand, if Cu is added, unevenly precipitated copper sulfide will be formed, thereby increasing the amount of difference in iron loss and magnetic flux density, thereby reducing the quality of the steel product

Method used

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  • Method of manufacturing grain-oriented electrical steel sheets
  • Method of manufacturing grain-oriented electrical steel sheets
  • Method of manufacturing grain-oriented electrical steel sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The slab used to prepare the grain oriented electrical steel sheet contains the following components in weight percent: 3.18% of Si, 0.056% of C, 0.062% of Mn, 0.0029% of S, 0.0020% of N, 0.026% of soluble Al and The balance of iron and other unavoidable impurities. The temperature at which AlN completely dissolves in the solution is 1164°C, and the temperature at which MnS completely dissolves in the solution is 1133°C. The above slabs were heated for 210 minutes at the following temperatures: 1130°C (at this temperature, both AlN and MnS are partially dissolved in the solution), 1150°C (at this temperature, MnS is completely dissolved in the solution, and AlN is partially dissolved in the solution), 1175°C and 1190°C (both temperatures are higher than 1164°C, so both AlN and MnS are completely dissolved in solution). The heated slab was then hot-rolled to produce a hot-rolled sheet having a thickness of 2.3 mm. The hot-rolled sheet is heated to above 1100°C, kept at...

Embodiment 2

[0097] The slab used to prepare the grain-oriented electrical steel sheet contains the following components in weight percentage: 3.21% of Si, 0.056% of C, 0.055% of Mn, 0.0029% of S, 0.024% of soluble Al, as shown in Table 2 below different contents of N and the balance of iron and other unavoidable impurities, the above-mentioned slab was heated for 210 minutes at a temperature higher than the temperature at which the precipitate was completely dissolved in the solution (the temperature at which MnS was completely dissolved in the solution was 1125°C, and the temperature at which AlN was completely dissolved See Table 2 for the temperature of the solution. The heated slab was hot-rolled to produce a hot-rolled sheet having a thickness of 2.3 mm. The hot-rolled sheet is heated to above 1100°C, kept at 900°C for 90 seconds, quenched in water, cleaned with acid, and then cold-rolled to a thickness of 0.30mm. Simultaneous decarburization and nitriding of cold-rolled sheets by i...

Embodiment 3

[0103] The slab used to prepare the grain-oriented electrical steel sheet contains the following components in weight percentage: 3.27% of Si, 0.045% of C, 0.064% of Mn, 0.0015% of N, 0.024% of soluble Al, as shown in Table 3 below different contents of S and the balance of iron and other unavoidable impurities, the above-mentioned slab was heated at a temperature higher than 1132° C. (this temperature is the temperature at which both MnS and AlN are completely dissolved in the solution) for 210 minutes. The heated slab was then hot-rolled to produce a hot-rolled sheet having a thickness of 2.3 mm. The hot-rolled sheet is heated to above 1100°C, kept at 900°C for 90 seconds, quenched in water, cleaned with acid, and then cold-rolled to a thickness of 0.30mm. Simultaneous decarburization and nitriding of cold-rolled sheets by introducing a mixture of 75% hydrogen and 25% nitrogen with a dew point of 65°C and 1% dry ammonia at the same time into a steelmaking furnace at a temper...

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Abstract

Disclosed is a method of producing grain-oriented electrical steel sheets, which are used as iron core materials for electrical devices, including large-sized rotating machines such as various transformers and electric generators. More specifically, disclosed is a method for producing a grain-oriented electrical steel sheet having excellent magnetic properties, low iron loss, and high magnetic flux density, or at least one of these properties, the method comprising reheating a slab for the grain-oriented electrical steel sheet, hot-rolling the reheated slab to produce a hot-rolled sheet, optionally annealing the hot-rolled sheet, cold-rolling the resulting sheet, subjecting the cold-rolled sheet to simultaneous decarburization and nitriding annealing, and then subjecting the annealed sheet to secondary recrystallization annealing, wherein a vary small amount of N and S are added to the slab, such that AlN and MnS can be produced and completely dissolved in solution in the slab reheating.

Description

technical field [0001] The present invention relates to a method for producing grain oriented electrical steel sheets for use as core materials for electrical equipment including various transformers and large rotating machinery such as generators; more particularly, the present invention relates to the production of A method of grain oriented electrical steel sheet having excellent magnetic properties, low iron loss, high magnetic flux density or at least one of the above properties, said method comprising: reheating for the preparation of grain oriented electrical A slab of steel sheet, hot rolling the reheated slab to produce a hot rolled sheet, optionally annealing the hot rolled sheet, cold rolling the resulting steel sheet, subjecting the cold rolled sheet to simultaneous decarburization and nitriding annealing, and then the annealed steel plate is subjected to secondary recrystallization annealing; wherein a very small amount of N and S are added to the slab, so that Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12
CPCC21D8/1222C21D8/1233C21D8/1272C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 朱炯暾朴钟泰金昌洙韩奎锡金在宽金炳久崔奎承李元杰施性奎林才洙
Owner 浦项股份有限公司
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