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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.

Active Publication Date: 2019-05-24
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of high production cost, unreasonable composition and process in the prior art, such as reduced magnetic induction or broken bands, and provides a method for optimizing chemical composition and annealing cooling to make AlN, MnS, Cu x The total number of S precipitates does not exceed 200×10 6 / mm 3 , the average size of precipitates is not less than 0.50μm, and the residual stress after annealing and cooling is not more than 70MPa, thus effectively suppressing AlN, MnS, Cu x Adverse effects of S precipitates and residual stress on the magnetic properties of finished products, P 1.0 / 400 ≤16.0W / kg,B 5000 ≥1.65T non-oriented silicon steel for electric vehicle drive motor and production method

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Using converter smelting and RH vacuum refining, the chemical composition by weight percentage is shown in Table 1; the heating temperature of the test steel hot rolling is 1150 °C, and the time in the furnace is 120 minutes; the rough rolling outlet temperature is 880 °C; the rough rolling outlet thickness is 28mm; 750°C; reduction ratio of 4 passes before finishing rolling is 88%; coiling temperature is 690°C; thickness of hot-rolled sheet is 2.0mm. The temperature of the soaking section of the normalized continuous furnace is 900 °C; the soaking time is 3 minutes; the hot-rolled sheet is cold-rolled by a single cold rolling method after pickling, and the thickness of the finished product is 0.35mm; the annealing soaking temperature is 960 °C, and the soaking time is 2min. The cooling rate is controlled at 8°C / s from the annealing soaking temperature to 600°C, and the cooling rate is controlled at 45°C / s during cooling from less than 600°C to below 300°C. Test the iro...

Embodiment 2

[0079] According to the chemical composition of Example 3 in Table 1, and using the same process conditions, that is, using a converter and a vacuum furnace for smelting, followed by continuous casting; the heating temperature of the continuous casting billet is 1130 ° C, and the furnace time is 120 min; the rough rolling outlet temperature At 860℃; the thickness of the rough rolling outlet is 30mm; the finishing temperature of finishing rolling is 730℃; the total reduction rate of 4 passes before finishing rolling is 85%; the coiling temperature is 672℃; The temperature of the soaking section of the continuous furnace is 860 °C, and the soaking time is 4 minutes; after the hot-rolled sheet is pickled, it is cold-rolled to the finished product thickness by a single cold rolling method, and the finished product thickness is 0.30mm; the annealing soaking time is 2.5min; according to the formula: 850 +100×t≤T≤950+100×t, the annealing soaking temperature should be within the range ...

Embodiment 3

[0086] According to the chemical composition of Example 4 in Table 1, and using the same process conditions, that is, using a converter and a vacuum furnace to smelt, followed by continuous casting; the heating temperature of the continuous casting slab is 1055 ° C, and the time in the furnace is 135 min; the exit temperature of rough rolling at 875°C; the exit thickness of rough rolling is 33mm; the final rolling temperature is at 725°C; the total reduction rate of the 4 passes before finish rolling is 83%; the coiling temperature is at 676°C; the thickness of hot-rolled sheet is 2.3mm; The temperature in the soaking section of the furnace is 895°C, and the soaking time is 3 minutes; after pickling, the hot-rolled plate is cold-rolled to the thickness of the finished product by a cold rolling method, and the thickness of the finished product is 0.27mm; the soaking time for annealing is 1.5 minutes; according to the formula: 850+100 ×t≤T≤950+100×t, the annealing soaking tempera...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/16C22C33/04C21D8/12
Inventor 石文敏詹东方杨光吕黎冯大军杜光梁陈圣林李准龚学成
Owner 武汉钢铁有限公司
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