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Grain-oriented electrical steel sheet and method of manufacturing the same

A technology of electromagnetic steel sheets and manufacturing methods, applied in the direction of inductance/transformer/magnet manufacturing, manufacturing tools, circuits, etc., can solve the problems of insulation, corrosion resistance will not recover, increased processing procedures, and unfavorable costs, etc., to achieve insulation and excellent corrosion resistance

Active Publication Date: 2017-08-04
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Thermal strain-introduced magnetic domain refinement methods such as laser beam irradiation or electron beam irradiation have a problem in that the insulating film on the steel sheet is damaged due to rapid and local heat introduction, and as a result, the interlayer resistance and withstand voltage are reduced. class insulation, and deterioration of corrosion resistance
However, when recoating is performed, there are problems such as an increase in cost due to additional process, and deterioration of magnetic properties due to deterioration of space factor (occupancy ratio).
[0007] In addition, when the film is severely damaged, there is a problem that the insulation and corrosion resistance will not be restored even if recoating is performed, but the coating amount per unit area of ​​the recoating will become thicker.
In addition, Patent Document 6 discloses a method of irradiating laser light from both sides of a steel plate to maintain insulation and reduce iron loss. However, the method of irradiating both sides of the steel plate increases the number of processing steps, which is disadvantageous in terms of cost.

Method used

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  • Grain-oriented electrical steel sheet and method of manufacturing the same
  • Grain-oriented electrical steel sheet and method of manufacturing the same
  • Grain-oriented electrical steel sheet and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] For a compound containing 3.25 mass % of Si, 0.04 mass % of Mn, 0.01 mass % of Ni, 60 mass ppm of Al, 20 mass ppm of S, 250 mass ppm of C, 16 mass ppm of O and 40 mass ppm of N The grain-oriented electrical steel sheet rolled to a final thickness of 0.23mm is decarburized with a cold-rolled sheet, and after primary recrystallization annealing, an annealing separator with MgO as the main component is applied, and the secondary recrystallization process and purification process are carried out. Final annealing was performed to obtain a grain-oriented electrical steel sheet having a forsterite coating. Then, the following coating solution A was applied to the steel sheet, and fired at 800° C. to form an insulating film. Thereafter, continuous fiber laser irradiation or Q-switched pulsed laser irradiation was performed on the insulating film at intervals of 3 mm along the rolling direction perpendicular to the rolling direction to perform magnetic domain refining treatment....

Embodiment 2

[0136] Containing the same composition as in Example 1, the grain-oriented electrical steel sheet rolled into a final plate thickness of 0.23 mm is decarburized and primary recrystallization annealed with a cold-rolled sheet, and then coated with MgO as an annealing separator as a main component. The final annealing including the secondary recrystallization process and the purification process obtains a grain-oriented electrical steel sheet with a forsterite coating. Then, the coating liquid A in the above-mentioned Example 1 was applied to the steel sheet, and fired at 800° C. to form an insulating film. Thereafter, the insulating film was irradiated with electron beams at intervals of 3 mm in the rolling direction perpendicular to the rolling direction and the vacuum degree of the processing chamber was 1 Pa, or continuously irradiated to perform magnetic domain refinement treatment. As a result, the magnetic flux density B 8 A material whose value is 1.92T to 1.94T.

[01...

Embodiment 3

[0142] The final plate thickness is rolled to 3.3% by mass of Si, 0.08% by mass of Mn, 0.05% by mass of Cu, 0.002% by mass of Al, 0.001% by mass of S, 0.06% by mass of C, and 0.002% by mass of N After decarburization and primary recrystallization annealing are performed on the 0.23mm grain-oriented electrical steel sheet, a part of the cold-rolled sheet is treated as a coil in a batch of salt bath for nitrogen treatment, which increases the amount of N in the steel by 700ppm. Thereafter, an annealing separator mainly composed of MgO was applied, and final annealing including a secondary recrystallization process and a purification process was performed to obtain a grain-oriented electrical steel sheet with a forsterite coating. Next, the coating solution A in Example 1 described above was applied to the grain-oriented electrical steel sheet, and fired at 800° C. to form an insulating film. Thereafter, the insulating film was irradiated with electron beams at intervals of 3 mm ...

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Abstract

A grain-oriented electrical steel sheet, on which magnetic domain refining treatment by strain application has been performed, has an insulating coating with excellent insulation properties and corrosion resistance. In a grain-oriented electrical steel sheet, linear strain having been applied thereto by irradiation with a high-energy beam, the linear strain extending in a direction that intersects a rolling direction of the steel sheet, an area ratio of irradiation marks within an irradiation region of the high-energy beam is 2% or more and 20% or less, an area ratio of protrusions with a diameter of 1.5 microns or more within a surrounding portion of the irradiation mark is 60% or less, and an area ratio of exposed portions of steel substrate in the irradiation mark is 90% or less.

Description

[0001] This application is a divisional application of the international application PCT / JP2012 / 008408, which entered the Chinese national phase on June 27, 2014, with the application number 201280065124.7 and the invention name "oriented electrical steel sheet and its manufacturing method". technical field [0002] The present invention relates to a grain-oriented electrical steel sheet suitable for use as a core material of a transformer or the like, and a method for manufacturing the same. Background technique [0003] Grain-oriented electrical steel sheets are mainly used as iron cores of transformers, which require excellent magnetization characteristics, especially low iron loss. [0004] Therefore, it is important to make the secondary recrystallized grains in the steel plate highly consistent with the (110)[001] orientation (Gauss orientation) and reduce impurities in the finished product. In addition, there are limits to the control of crystal orientation and the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/38C21D8/12C21D9/46C22C38/02C22C38/04C22C38/06C22C38/08C22C38/16C22C38/60C23C8/26C23C8/50C23C8/80H01F1/147H01F1/18H01F41/00
CPCC21D1/38C21D8/12C21D8/1255C21D8/1277C21D8/1283C21D8/1294C21D9/46C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/08C22C38/16C22C38/60C23C8/26C23C8/50C23C8/80H01F1/14775H01F1/14783H01F1/18H01F41/005C21D2201/05H01F1/147H01F41/00
Inventor 井上博贵高城重宏山口广冈部诚司花泽和浩
Owner JFE STEEL CORP
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