Grain-oriented electrical steel sheet having low core loss and high magnetic flux density
A technology of oriented electrical steel sheet and high magnetic flux density, which is applied in the field of oriented electrical steel sheet, can solve the problems of reduced magnetic flux density, complex process, low stability and reliability of machining, and achieve the effect of preventing the deterioration of magnetic flux density
Active Publication Date: 2014-03-26
浦项股份有限公司
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Problems solved by technology
However, it has the disadvantages of low machining stability and reliability and complicated process.
[0014] In addition, permanent magnetic domain refinement technologies such as etching method and roller method achieve the effect of reducing iron loss through magnetic domain refinement, but there is a problem that the magnetic flux density decreases after stress relief annealing.
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[0032] In order to solve the problem that the magnetic flux density deteriorates due to the heat-affected zone of the magnetic domain refinement groove, which was not recognized in the prior art, the present inventors repeated several studies and experiments. Controlling the groove formation factor on the surface of the magnetic domain refinement steel sheet that has not been suggested in this paper can maximize the iron loss reduction effect after stress relief annealing and suppress the change of magnetic flux density caused by the heat-affected zone. bad phenomenon.
[0033] First, the laser output and irradiation speed are controlled by existing methods, so that magnetic domain refinement grooves of various widths and depths are formed on the surface of the steel sheet after secondary crystallization. Observing the magnetic domain refinement grooves formed in this way, the result is that they are all formed in a wedge shape (V-shaped), and the formation of grooves with any...
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Abstract
The present invention relates to a grain-oriented electrical steel sheet on which a plurality of linear grooves are formed on a surface to miniaturize magnetic domains. Given that a groove depth which reaches the bottom portion from the surface of the steel sheet is "H", and that a horizontal length of a bottom surface of which depth from the surface of the steel sheet is over 4 / 5 of the groove depth is "W", the groove depth and the horizontal length of the bottom surface satisfy the relation "0.1=2H / W=2" in the grain-oriented electrical steel sheet having low core loss and high magnetic flux density. Thus, core loss of the grain-oriented electrical steel sheet is improved by 10% to 20% through the miniaturization of the magnetic domains, and it is also possible to manufacture the grain-oriented electrical steel sheet which has extremely excellent magnetic characteristics because the magnetic flux density is not deteriorated even after stress relief annealing.
Description
technical field [0001] The present invention relates to a grain-oriented electrical steel sheet used in a transformer etc. as a core etc. which utilizes a moving path of a magnetic field by a voltage applied to a coil, and more specifically relates to a magnetic steel sheet formed on the surface with an appropriate groove formation factor. Grain-oriented electrical steel sheet with domain refinement grooves for excellent iron loss and magnetic flux density after stress relief annealing. Background technique [0002] Grain-oriented electrical steel sheets are made of silicon steel (Si-Steel) with a secondary recrystallization texture in the {110}<001> orientation parallel to the rolling direction. Goss), in order to improve the iron loss performance, many researchers have invented and introduced new manufacturing methods. [0003] Iron loss reduction methods for grain-oriented electrical steel sheets are broadly classified into methods of increasing the texture orienta...
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IPC IPC(8): C21D8/12
CPCC21D8/12
Inventor 权五烈车相润韩赞熙金在宽
Owner 浦项股份有限公司