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Grain-oriented electrical steel sheet and manufacturing method therefor

A technology of grain-oriented electrical steel sheet and manufacturing method, applied in manufacturing tools, circuits, electrical components, etc., can solve the problems of high precipitate decomposition temperature, high MnS precipitate, hindering magnetic domain movement, etc., to achieve excellent magnetic properties and excellent production. sexual effect

Inactive Publication Date: 2019-08-06
POHANG IRON & STEEL CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the high-temperature purification annealing process, after the AlN-based precipitates are decomposed into Al and N, Al migrates to the surface of the steel plate and reacts with oxygen in the surface oxide layer, thereby forming Al 2 o 3 Oxides, aluminum-based oxides formed in this way or AlN precipitates that have not been completely decomposed during the cleaning annealing process hinder the movement of magnetic domains in the steel plate or near the surface and become the cause of iron loss deterioration
[0011] As mentioned above, in order to remove impurities, even if high temperature annealing is carried out for a long time at high temperature, since a certain amount of Al and Mn are added in the steelmaking step to form precipitates, it is inevitable that there will still be precipitates containing Al and Mn or Minimal oxide residues remain in the final product, causing magnetic deterioration
[0012] The recently developed oriented electrical steel sheet manufacturing technology that adopts the slab low-temperature heating method of forming secondary recrystallization from AlN-based nitrided precipitates through nitriding treatment after decarburization annealing after cold rolling also has the following problems: the content of Mn is too high Due to the amount added in the slab high-temperature heating method, the possibility of forming coarse MnS precipitates is high. Therefore, after the secondary recrystallization is completed, in order to remove the components of AlN and MnS precipitates, it is necessary to purify and anneal at high temperature for a long time. Does not solve the problems caused by the complexity and cost burden of the manufacturing process
Therefore, in fact, it is not a method of manufacturing grain-oriented electrical steel sheets that completely excludes precipitates, and the magnetic properties obtained thereby are also worse than those of grain-oriented electrical steel products commonly used at present.
In addition, even if all impurities in the steel sheet are removed as much as possible to ensure low iron loss performance, the problem of increased cost burden in terms of productivity cannot be solved
[0016] In addition, attempts have been made to use various precipitates such as TiN, VN, NbN, BN, etc. as grain growth inhibitors, but due to thermal instability and excessively high decomposition temperature of the precipitates, stable secondary recrystallization is formed suffer failure

Method used

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  • Grain-oriented electrical steel sheet and manufacturing method therefor
  • Grain-oriented electrical steel sheet and manufacturing method therefor
  • Grain-oriented electrical steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] A slab was prepared which contained C: 0.055%, Si: 3.2%, P: 0.03%, Sn: 0.04%, B: 0.005%, N: 0.002% and varied as shown in Table 1 below in % by weight The contents of Mn, S, and Se, and the balance contains Fe and unavoidable impurities.

[0104] After the slab is heated to 1250°C, it is then hot-rolled to a thickness of 2.3mm. After measuring the unilateral crack generation depth of the hot-rolled sheet, the hot-rolled sheet was heated to 950° C., and then soaked for 120 seconds to implement annealing of the hot-rolled sheet.

[0105] Next, the annealed hot-rolled steel sheet was pickled, and then cold-rolled to manufacture a cold-rolled sheet having a thickness of 0.30 mm. The cold-rolled steel sheet was held at a temperature of 830° C. for 180 seconds in a moist hydrogen-nitrogen mixed gas environment with a dew point temperature of 60° C., and then heat-treated for decarburization and recrystallization.

[0106] After the annealing separator MgO is coated on the s...

Embodiment 2

[0112] Prepare a slab containing C: 0.06%, Si: 3.0%, Mn: 0.035%, S: 0.015%, Se: 0.015%, P: 0.02%, Sn: 0.06%, N : 0.0015% and the content of B was changed as shown in Table 2 below, and the balance contained Fe and unavoidable impurities.

[0113] After the slab is heated to 1200°C, it is hot rolled to a thickness of 2.0mm. After measuring the unilateral crack generation depth of the hot-rolled sheet, the hot-rolled sheet was heated to 1000° C., and then soaked for 120 seconds to implement annealing of the hot-rolled sheet.

[0114] Next, the annealed hot-rolled steel sheet was pickled, and then cold-rolled to manufacture a cold-rolled sheet having a thickness of 0.23 mm. The cold-rolled steel sheet was kept at a temperature of 820° C. for 150 seconds in a moist hydrogen-nitrogen mixed gas environment with a dew point temperature of 60° C., and then heat-treated for decarburization and recrystallization.

[0115] After the annealing separator MgO is coated on the steel plate,...

Embodiment 3

[0121] Prepare a slab containing C: 0.051%, Si: 3.3%, Mn: 0.047%, S: 0.014%, Se: 0.016%, P: 0.035%, Sn: 0.06%, B : 0.0055% and the contents of Al and N were changed as shown in Table 3 below, and the balance contained Fe and unavoidable impurities.

[0122] After the slab is heated to 1150°C, it is then hot-rolled to a thickness of 2.6mm. After measuring the unilateral crack generation depth of the hot-rolled sheet, the hot-rolled sheet was heated to 1100° C., and then soaked for 150 seconds to implement annealing of the hot-rolled sheet.

[0123] Next, the annealed hot-rolled steel sheet was pickled, and then cold-rolled to manufacture a cold-rolled sheet with a thickness of 0.27 mm. The cold-rolled steel sheet was held at a temperature of 855° C. for 180 seconds in a moist hydrogen-nitrogen mixed gas environment with a dew point temperature of 60° C., and then subjected to decarburization and recrystallization heat treatment.

[0124] After the annealing separator MgO is c...

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Abstract

According to one embodiment of the present invention, a grain-oriented electrical steel sheet comprises, by wt%, 1.0-7.0% of Si, 0.005% or less (excluding 0%) of C, 0.0010-0.1% of P, 0.005-0.2% of Sn,0.0005-0.020% of S, 0.0005-0.020% of Se, 0.0001-0.01% of B, and the balance of Fe and other inevitable impurities.

Description

technical field [0001] The invention relates to a oriented electrical steel plate and a manufacturing method thereof. More specifically, the present invention relates to a grain-oriented electrical steel sheet utilizing composite grain boundary segregation of S and Se and composite inclusions of Fe(S,Se) and a manufacturing method thereof. Background technique [0002] Oriented electrical steel sheet is a soft magnetic material used as the iron core of various transformers and large rotating equipment such as generators that require excellent unidirectional magnetic properties. The grain orientation on the surface of the steel sheet is {110} plane, rolled The crystalline orientation of the direction enables the formation of a Gaussian texture ({110}<001> texture) parallel to the <001> axis on the entire steel sheet, resulting in excellent magnetic properties in the rolling direction. [0003] The magnetic properties of electrical steel sheets can be characterize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/60C21D8/12C21D9/04C22C38/04H01F1/147
CPCC21D8/12C22C38/02C22C38/04C22C38/60H01F1/147C22C38/008C22C38/002C22C38/001C21D2201/05C21D9/46C21D6/008C21D1/74C21D3/04C21D8/1233C21D8/1255C21D8/1272C21D8/1283C21D8/1222C21D8/1266H01F1/14775C21D9/04C21D8/0205C21D8/021C21D8/0226C21D8/0236C21D9/0081C22C38/004C22C38/06C22C38/14
Inventor 韩奎锡朴昶洙金在谦朴钟泰
Owner POHANG IRON & STEEL CO LTD