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Manufacture of directional electromagnetic steel plate

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the field of manufacturing oriented electrical steel sheet, and can solve the problems of low magnetic flux density and the like

Inactive Publication Date: 2003-03-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, compared with the case of manufacturing using an inhibitor, there is a problem that the obtained magnetic flux density is lower when manufacturing without using an inhibitor.

Method used

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  • Manufacture of directional electromagnetic steel plate
  • Manufacture of directional electromagnetic steel plate
  • Manufacture of directional electromagnetic steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] Continuous casting produced steel sheets with material compositions shown in Table 1. All components not shown in Table 1 were reduced to 50 ppm or less. These sheets were formed into 2.2 mm thick hot-rolled sheets by heating the sheets at 1030 degrees for 20 minutes followed by hot rolling. After performing soaking annealing at 1000 degrees Celsius for 30 seconds, the final plate thickness of 0.30 mm was completed by cold rolling at normal temperature.

[0139] Primary recrystallization annealing was performed by soaking at 930° C. for 10 seconds in an atmosphere of hydrogen: 25 vol %, nitrogen: 75 vol %, and dew point: −30° C. After that, without using an annealing separator, in a mixed atmosphere of nitrogen: 50vol%, argon: 50vol% (dew point: -30 degrees) at a rate of 50 degrees / h to 800 degrees, above 800 degrees at 10 degrees / h The speed is heated to 880 degrees, and kept at this temperature for 50 hours for secondary recrystallization annealing (annealing is...

Embodiment 2

[0148] After heating the steel plate with the material composition shown in Table 2 to 1125 degrees, it was hot-rolled to form a 2.8 mm thick hot-rolled plate. All components not shown in Table 2 were reduced to 50 ppm or less.

[0149] These cold-rolled sheets were subjected to hot-rolled sheet annealing at 1000° C. for 60 seconds, and cold-rolled to obtain a final sheet thickness of 0.30 mm. Primary recrystallization annealing was performed by soaking at 920° C. for 20 seconds in an atmosphere of hydrogen: 50 vol %, nitrogen: 50 vol %, and dew point: −50° C. After that, without using an annealing separator, the temperature was raised to 900°C at a rate of 10°C / h, and the secondary recrystallization annealing at 900°C for 75 hours was carried out in a nitrogen atmosphere with a dew point of -40°C (annealing was finally completed).

[0150] After the secondary recrystallization annealing, a tension of 4Mpa is applied to the steel plate, and a flattening annealing at 875°C for...

Embodiment 3

[0158] Continuous casting manufacturing contains C: 0.030%, Si: 3.3%, Mn: 0.05%, and Sb: 0.02%, and Al is reduced to 40ppm, N is reduced to 20ppm, all other components are reduced to less than 50ppm, and the rest is Fe and unavoidable A steel plate composed of impurities. After heating the plate at 1100°C for 30 minutes, a hot-rolled plate with a thickness of 3.2 mm was formed by hot rolling, and the hot-rolled plate was annealed under the conditions shown in Table 3. Thereafter, the final sheet thickness of 0.50 mm was completed by cold rolling at a temperature of 250°C.

[0159]Primary recrystallization annealing with soaking for 30 seconds was performed at 900° C. in a mixed atmosphere of 30° C. dew point, 75 vol % nitrogen, and 25 vol % hydrogen. Afterwards, using forsterite as an annealing separator, in a nitrogen atmosphere with a dew point of -20°C, the temperature was raised to 1000°C at a rate of 50°C / h for final annealing.

[0160] After secondary recrystallization...

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Abstract

A method of manufacturing a grain-oriented steel sheet including hot-rolling a slab prepared using molten steel containing, by mass%, C of not more than about 0.08 %, Si of about 1.0 to about 8.0 % and Mn of about 0.005 to about 3.0 %; optionally annealing the hot-rolled steel sheet; performing cold rolling once, or twice or more with intermediate annealing therebetween; performing primary recrystallization annealing in a low- or non-oxidizative atmosphere and adjusting the C content in the steel sheet after primary recrystallization annealing to be held in the range of about 0.005 to about 0.025 mass%; performing secondary recrystallization annealing; decarburization annealing; and, preferably, performing additional high-temperature continuous or batch annealing. A grain-oriented electrical steel sheet having a sufficiently high magnetic flux density and a low iron loss can be advantageously obtained even when it is manufactured without using an inhibitor.

Description

technical field [0001] The present invention relates to a forsterite (Mg 2 SiO 4 ) is a method of manufacturing a directional (grain-oriented) electrical steel sheet having a high magnetic flux density and preferably low magnetic loss with an undercoat layer (glass coating) as the main body. Background technique [0002] Due to the emphasis on energy loss due to iron loss, grain-oriented electrical steel sheets with low iron loss are used as core materials for large motors, generators, and transformers. [0003] figure 1 An example of the punched shape of the core (stator) of a large generator using laminated grain-oriented electrical steel sheets is shown in . As shown in the figure, a method in which a grain-oriented electrical steel sheet 1 provided in a strip shape is punched into a plurality of sector-shaped segments 2, and these segments are stacked and assembled. [0004] In the case of using such a lamination method, it is necessary to punch out a complex shape h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/00C22C38/02C22C38/60
CPCC21D8/1255C21D8/1272C22C38/004C22C38/60C21D8/125C21D8/1283C22C38/02C21D8/1233C21D8/12
Inventor 早川康之出上日出雄冈部诚司今村猛高岛稔黑泽光正
Owner JFE STEEL CORP
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