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Non-oriented magnetic steel sheet

An electromagnetic steel plate, non-directional technology, applied in the direction of inorganic materials, magnetic circuits, motors, etc., can solve the problems of reduced motor efficiency, narrow design, etc., and achieve the effect of excellent high-frequency iron loss characteristics

Pending Publication Date: 2021-07-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the viewpoint of ensuring the strength of the rotor, it is sufficient to increase the width of the bridge portion, but in this case, the leakage flux of the permanent magnet increases and the efficiency of the motor decreases. Therefore, the bridge width is designed within the range that can ensure the strength of the rotor. as narrow as possible

Method used

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Embodiment

[0084] The molten steel blown in the converter was subjected to vacuum degassing treatment, and steels having the composition No. 1 to 62 shown in Table 1 were melted and continuously cast to obtain steel raw materials (steel billets). At this time, the reflux time after deoxidation in the vacuum degassing treatment was changed as shown in Table 2. Next, the above-mentioned billet was reheated to a temperature of 1140°C, and after holding for 1 hour (hr), it was hot-rolled so that the finishing temperature of finish rolling was 800°C to produce a hot-rolled sheet, and then coiled at a temperature of 610°C. For coils. Next, the above hot-rolled sheet in 100 vol% N 2 Under the atmosphere, the hot-rolled sheet is annealed under the condition of 950 ° C × 30s, and cold-rolled after pickling to make a cold-rolled sheet with a thickness of 0.25 mm, and then, in 20 volume %H 2 -80% by volume N 2 Under the atmosphere, final annealing was performed under the conditions shown in Tabl...

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Abstract

The present invention provides a non-oriented magnetic steel sheet having a component composition comprising 0.005 mass% or less of C, 3-5 mass% of Si, 5 mass% or less of Mn, 0.1 mass% or less of P, 0.01 mass% or less of S, 3 mass% or less of Al, 0.005 mass% or less of N, and 0.0005-0.003 mass% of Zn, the balance being Fe and unavoidable impurities. The non-oriented magnetic steel sheet has an average crystal grain diameter of 40 [mu]m or less, a number of inclusions of 5 / mm2 or less for a diameter of 5 [mu]m or greater, a tensile strength of 600 MPa or higher, and a fatigue strength of 450 MPa or higher, the non-oriented magnetic steel sheet having exceptional low iron loss, tensile strength, and fatigue strength.

Description

technical field [0001] The present invention relates to a non-oriented electrical steel sheet, and more specifically, to a non-oriented electrical steel sheet suitable for use in a rotor core of an electric motor. Background technique [0002] For motors of electric vehicles and air conditioners, since high efficiency is required, internal magnet motors (IPM motors) are generally used. In the rotor core of the IPM motor, permanent magnets are embedded in slots, and when rotating at a high speed, a large stress is applied to the bridges due to centrifugal force. From the viewpoint of ensuring the strength of the rotor, it is sufficient to increase the width of the bridge portion, but in this case, the leakage flux of the permanent magnet increases and the efficiency of the motor decreases. Therefore, the bridge width is designed within the range that can ensure the strength of the rotor. as narrow as possible. Therefore, electrical steel sheets used in motor cores require t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21D8/12C22C38/00C22C38/06C22C38/60H01F1/147
CPCC22C38/06C22C38/00C22C38/60H01F1/14791H01F1/16C21D8/1272C21D9/46C21D8/1205C22C38/004C22C38/02C22C38/04C22C38/001C22C38/002C22C38/34C22C38/38C22C38/40C22C38/008C22C38/22C22C38/20C22C38/28C22C38/005C21D8/12C21D8/1222C21D8/1233C21D8/1244C21D8/1261C21D6/008C21D6/005C21D6/00C21D1/26C21D1/74C22C38/24Y02T10/64H01F1/147C21D6/004C21D8/005C22C2202/02
Inventor 尾田善彦财前善彰大久保智幸田中孝明宫本幸乃
Owner JFE STEEL CORP
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