Non-oriented silicon steel for electric vehicle drive motor with excellent magnetic properties and production method

A technology for electric vehicles and driving motors, applied in the field of non-oriented silicon steel production, which can solve problems such as reduced magnetic induction, broken belts, unreasonable components and processes, etc.
CN107587039BActive Publication Date: 2019-05-24武汉钢铁有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
武汉钢铁有限公司
Publication Date
2019-05-24

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Abstract

The invention provides non-oriented silicon steel with excellent magnetism and for a drive motor of an electric car. The non-oriented silicon steel comprises, by weight, 1.0 to 3.5% of Si, 0.5 to 2.0%of Al, 0.5 to 2.0% of Mn, no more than 0.003% of N, no more than 0.002% of S, no more than 0.003% of C, no more than 0.05% of P and no more than 0.05% of Cu. The production method for the non-oriented silicon steel comprises the following steps: smelting and casting; heating of continuously cast billet; rough rolling; finish rolling; reeling; normalizing; pickling; single-stage cold rolling; annealing; segmental speed-variable cooling; and natural cooling to room temperature for subsequent usage. With the method in the invention, the total number of AlN, MnS and Cu<x>S precipitates is no morethan 200 * 10<6> / mm<3>, the average size of the precipitates is no less than 0.50 [mu]m, and residual stress after annealing and cooling is no more than 70 MPa, so unfavorable influence of the AlN, MnS and Cu<x>S precipitates and residual stress on magnetism is effectively inhibited, and the produced non-oriented silicon steel for the drive motor of the electric car has a thickness of 0.27 to 0.35 mm, P<1.0 / 400> of no more than 16.0 W / kg and B<5000> of no less than 1.65 T.
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Description

technical field

[0001] The invention belongs to the technical field of non-oriented silicon steel production, and in particular relates to a non-oriented electrical steel sheet with excellent magnetic properties and a manufacturing method thereof, and is particularly suitable for electric vehicle driving motor steel and a production method. Background technique

[0002] In recent years, global environmental problems have become increasingly prominent. Many energy-saving fields are advocating energy-saving products. Environmental response technologies are constantly developing, and the automotive field is no exception. The technologies of low emission and fuel consumption reduction have made great progress. The field of electric vehicles and hybrid electric vehicles is a very prominent example in the field of energy saving and emission reduction. The performance of the vehicle drive motor directly affects the performance of these electric vehicles.

[0003] The iron core of t...

Claims

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