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Non-oriented silicon steel with excellent magnetism and for drive motor of electric car, and production method thereof

A technology for electric vehicles and driving motors, applied in the field of non-oriented silicon steel production, can solve the problems of broken belt, reduced magnetic induction, unreasonable composition and process, etc.

Active Publication Date: 2018-01-16
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 with excellent magnetism and for drive motor of electric car, and production method thereof
  • Non-oriented silicon steel with excellent magnetism and for drive motor of electric car, and production method thereof
  • Non-oriented silicon steel with excellent magnetism and for drive motor of electric car, and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Using converter smelting and RH vacuum refining, the chemical composition obtained in weight percentage is shown in Table 1; the test steel hot rolling heating temperature is 1150 ° C, and the furnace time is 120 min; the rough rolling exit temperature is 880 ° C; the rough rolling exit thickness is 28 mm; the finishing rolling temperature 750°C; the reduction ratio of the 4 passes before finish rolling is 88%; the coiling temperature is 690°C; the thickness of the hot-rolled sheet is 2.0mm. The temperature in the soaking section of the normalization continuous furnace is 900°C; the soaking time is 3 minutes; the hot-rolled plate is cold-rolled by a 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 2 minutes. Control the cooling rate at 8 °C / s from the annealing soaking temperature to 600 °C, and control the cooling rate at 45 °C / s during cooling from less than 600 ...

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 to smelt, followed by continuous casting; the heating temperature of the continuous casting slab is 1130 ° C, and the time in the furnace is 120 min; the exit temperature of rough rolling at 860°C; the exit thickness of rough rolling is 30mm; the finish rolling temperature is at 730°C; The temperature in the soaking section of the chemical continuous furnace is 860 ° C, and the soaking time is 4 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 0.30 mm; the soaking time for annealing is 2.5 minutes; according to the formula: 850 +100×t≤T≤950+100×t, the annealing soaking temperature should be within the range of 880-980°C and the annealing soaking temperature is outside the range of 880-980°C of the pres...

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 drive motor steel and the production method. Background technique [0002] In recent years, global environmental problems have become increasingly prominent. Many energy-saving fields are promoting energy-saving products. Environmental response technologies are constantly developing. The automotive field is no exception. Low emissions and fuel consumption reduction technologies have made great progress. The fields of electric vehicles and hybrid electric vehicles are very prominent examples in the field of energy saving and emission reduction, and the performance of vehicle drive motors directly affects the performance of these electric vehicles. [0003] The iron core of the drive ...

Claims

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Application Information

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Patent Type & Authority Applications(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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