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Electromagnetic Steel Sheet

A technology of electromagnetic steel plate and steel plate, applied in the direction of circuits, magnetic objects, magnetic materials, etc., can solve the problem of reducing the limit of plate thickness, and achieve the effect of excellent iron loss characteristics

Active Publication Date: 2014-09-17
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of manufacturing steel sheets using high-Si steel as a raw material by rolling, there is a limit to reducing the thickness of the sheet

Method used

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  • Electromagnetic Steel Sheet
  • Electromagnetic Steel Sheet
  • Electromagnetic Steel Sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Melting steel containing C: 0.0047% by mass, Si: 1.24% by mass, Mn: 0.15% by mass, and the balance consisting of Fe and unavoidable impurities is melted, continuous casting is made into a slab, and the slab is heated Hot rolling was performed at 1220° C. to obtain a hot-rolled sheet having a thickness of 1.8 mm. Next, this hot-rolled sheet was made into a cold-rolled sheet having a final sheet thickness of 0.10 mm under the following three conditions.

[0072] A: After the hot-rolled sheet is annealed at 1050°C for 75 seconds, the intermediate plate thickness is 1.0mm by the first cold rolling, and after the intermediate annealing at 1000°C for 30 seconds, the second pass Cold rolling was performed to obtain a cold-rolled sheet having a final sheet thickness of 0.10 mm.

[0073] · B: After performing hot-rolled sheet annealing at 1050° C.×75 seconds on the hot-rolled sheet, cold-rolled sheet having a final sheet thickness of 0.10 mm was obtained by one pass of cold rol...

Embodiment 2

[0082] A steel containing Si in the range of Si: 1.1 to 4.5% by mass, other components in the amounts listed in Table 2, and the balance consisting of Fe and unavoidable impurities was melted and continuously cast to form a slab. The slab was heated to 1200° C., hot-rolled to form a hot-rolled sheet with a thickness of 1.8 mm, pickled to remove scale, and then cold-rolled once to obtain a cold-rolled sheet with a final thickness of 0.10 mm. After that, in 15 vol% SiCl 4 +85vol%N 2 A siliconizing treatment (final annealing) was performed at 1150° C. for 300 seconds in an air atmosphere. Among them, the steel plate No.2 in Table 2 is 100 volume% N 2 Gas is the atmosphere for final annealing, and siliconizing treatment is not performed. In addition, the Si concentrations of the steel sheets after the siliconizing treatment were all substantially uniform in the thickness direction, and the Si amounts are shown in Table 2 together. In addition, for the sake of caution, componen...

Embodiment 3

[0089] For components containing C: 0.0062 mass%, Si: 2.09 mass%, Mn: 0.08 mass%, P: 0.011 mass%, Cr: 0.03 mass% and Sb: 0.035 mass%, the balance is composed of Fe and unavoidable impurities The composed steel was smelted and continuously cast to form a slab, and the slab was heated to 1150° C. and hot-rolled to obtain a hot-rolled sheet having a thickness of 2.2 mm. Next, pickling was performed to remove scale, and cold rolling was performed once to obtain a cold-rolled sheet having a final thickness of 0.10 mm. After that, in 10 vol% SiCl 4 In an atmosphere of +90% by volume Ar gas, perform a siliconizing treatment (final annealing) at 1200°C for 30 seconds, and change the Si concentration gradient in order to further promote the diffusion of Si into the interior. 2 Diffusion annealing at 1200° C. for the time shown in Table 3 was performed in an atmosphere. However, since the siliconizing treatment conditions were the same for all the steel sheets, the Si concentration av...

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Abstract

An electromagnetic steel sheet which can be excited at a high frequency and has a core having improved direct-current superimposition properties. The electromagnetic steel sheet has an element composition comprising less than 0.010 mass% of C, 1.5 to 10 mass% of Si and a remainder made up by Fe and unavoidable impurities, wherein the main orientation in the aggregate structure of the steel sheet is <111> / / ND and the random strength ratio in the main orientation is 5 or more, preferably the random strength ratio in the orientation of {111}<112> is 10 or more, more preferably the random strength ratio in the orientation of {310}<001> is 3 or less, and still more preferably the Si concentration has such a concentration gradient that the Si concentration is higher on a front surface layer side and is lower in the center part when observed in the thickness direction, wherein the maximum value of the Si concentration is 5.5 mass% or more and the difference between a highest value and a lowest value of the Si concentration is 0.5 mass% or more.

Description

technical field [0001] The present invention relates to an electromagnetic steel sheet used as a core material for a reactor for high-frequency excitation. Background technique [0002] It is known that the iron loss of an electromagnetic steel sheet generally increases sharply as the excitation frequency increases. However, the reality is that the driving frequency of transformers and reactors is increasing in order to achieve smaller iron cores and higher efficiency. Therefore, heat generation due to iron loss of the electrical steel sheet is becoming a problem more and more. [0003] In order to reduce the iron loss of the steel sheet, it is effective to increase the Si content to increase the intrinsic resistance of the steel. However, if the amount of Si in the steel exceeds 3.5% by mass, the workability will be remarkably reduced, making it difficult to produce it by the conventional rolling method for producing electrical steel sheets. Therefore, various methods of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/02C22C38/60H01F1/16C21D8/12
CPCC22C38/00C22C38/004C22C38/02C22C38/04C21D2201/05C21D8/12C22C38/60H01F1/16C22C38/002C22C38/008C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18H01F1/14775C22C38/20C22C38/22C22C38/34C22C38/42C22C38/44H01F1/14791
Inventor 今村猛高岛稔平谷多津彦
Owner JFE STEEL CORP
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