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Manufacturing method of high-strength non-oriented silicon steel for new energy vehicle driving motor

A new energy vehicle and drive motor technology, applied in the field of electrical steel manufacturing, can solve problems such as difficult processing and difficult to meet performance requirements, achieve good magnetic properties, improve mechanical strength and toughness, and control the effects of precipitate characteristics.

Active Publication Date: 2017-02-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the manufacturing process of non-oriented silicon steel, the addition of silicon increases the iron loss and reduces the magnetic induction, and at the same time the strength increases, but silicon is a brittle element. The more silicon in the steel, the more difficult it is to carry out subsequent processing; The addition characteristics of silicon content in the manufacturing process of grain-oriented silicon steel. When studying high-strength non-oriented silicon steel, 3% Si non-oriented silicon steel is used. The non-oriented silicon steel produced under this silicon content has relatively good magnetic and mechanical properties. At present, the existing technology is still difficult to meet the performance requirements of the drive motor for new energy vehicles on non-oriented silicon steel. How to take into account the magnetic properties and effectively improve the strength and toughness is a difficult problem that must be overcome in the current research on high-strength silicon steel.

Method used

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  • Manufacturing method of high-strength non-oriented silicon steel for new energy vehicle driving motor
  • Manufacturing method of high-strength non-oriented silicon steel for new energy vehicle driving motor
  • Manufacturing method of high-strength non-oriented silicon steel for new energy vehicle driving motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The molten steel smelted in a vacuum induction furnace contains 0.002% by weight of C, 2.8% of Si, 0.2% of Mn, 2% of Al, 0.5% of Ni, 0.5% of Cr, 0.08% of Nb, 0.003% of O, 0.004% of S, N 0.004%, P 0.005%, the balance is Fe and inevitable inclusions; where Nb / 93-(C / 12+N / 14)=0.08 / 93-(0.002 / 12+0.004 / 14)=0.00086-(0.00017 +0.00029)=0.0004;

[0043] The molten steel is introduced into the tundish and poured into the twin-roll strip continuous casting equipment for continuous casting through the distribution nozzle. Obtain a cast strip with a thickness of 2.7mm; the metallographic structure is as figure 2 shown;

[0044] The cast strip is air-cooled to 1100°C and then hot-rolled on-line. The hot-rolling start temperature is 1100°C, the final rolling temperature is 900°C, and the reduction is 26%.

[0045] The hot-rolled sheet is pickled to remove surface oxide scale, and then cold-rolled for 6 passes to obtain a cold-rolled sheet with a thickness of 0.35 mm;

[0046] The c...

Embodiment 2

[0049] Molten steel smelted in a vacuum induction furnace, its composition contains C 0.003%, Si 3.1%, Mn 1.0%, Al 1.2%, Ni 1.5%, Cr 2.0%, Nb 0.12%, O 0.003%, S 0.004% by weight percentage, N 0.002%, P 0.005%, the balance is Fe and inevitable inclusions; where Nb / 93-(C / 12+N / 14)=0.12 / 93-(0.003 / 12+0.002 / 14)=0.0013-( 0.00025+0.00014)=0.0009;

[0050] The molten steel is introduced into the tundish and poured into the twin-roll thin strip continuous casting equipment for continuous casting through the distribution nozzle. Obtain a cast strip with a thickness of 2.6mm;

[0051] The cast strip is air-cooled to 1120°C and then hot-rolled online. The hot-rolling start temperature is 1120°C, the final rolling temperature is 930°C, and the reduction is 35%.

[0052] The hot-rolled sheet is pickled to remove surface oxide scale, and then cold-rolled for 5 passes to obtain a cold-rolled sheet with a thickness of 0.35mm;

[0053] The cold-rolled sheet is annealed, and the annealing trea...

Embodiment 3

[0056] Molten steel smelted in a vacuum induction furnace, its composition contains C 0.004%, Si 3.5%, Mn 0.5%, Al 0.5%, Ni 1.0%, Cr 3%, Nb 0.15%, O 0.003%, S 0.004% by weight percentage, N 0.003%, P 0.005%, the balance is Fe and inevitable inclusions; where Nb / 93-(C / 12+N / 14)=0.15 / 93-(0.004 / 12+0.003 / 14)=0.0016-( 0.00033+0.00021)=0.0011;

[0057] The molten steel is introduced into the tundish and poured into the twin-roll strip continuous casting equipment for continuous casting through the distribution nozzle. Obtain a cast strip with a thickness of 2.5mm;

[0058] The cast strip is air-cooled to 1140°C and then hot-rolled on-line. The hot-rolling start temperature is 1140°C, the final rolling temperature is 980°C, and the reduction is 28%.

[0059] The hot-rolled sheet is pickled to remove surface oxide scale, and then cold-rolled for 4 passes to obtain a cold-rolled sheet with a thickness of 0.35mm;

[0060] The cold-rolled sheet is annealed, and the annealing treatment ...

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Abstract

The invention discloses a manufacturing method of high-strength non-oriented silicon steel for a new energy vehicle driving motor, and belongs to the technical field of manufacturing of electrical steel. The manufacturing method comprises the following steps: (1) molten steel is smelted, and comprises the following components: 0.002-0.005% of C, 2.8-3.5% of Si, 0.2-1% of Mn, 0.5-2% of Al, 0.5-2% of Ni, 0.5-3% of Cr, and the balance of Nb and Fe; (2) the molten steel is poured in continuous casting equipment for continuous casting to obtain a cast strip with a thickness of 2.5-2.7 mm; (3) the cast strip is hot rolled after air cooling, is cooled by water spraying, and is wound; (4) a scale on the surface of the cast strip is removed by pickling; and a cold-rolled plate is obtained through cold rolling; and (5) the annealing is performed under the condition of Ar2 atmosphere; and an insulation coating layer is coated for winding to obtain a finished plate. The manufacturing method adopts a strip continuous casting technology to produce the high-strength non-oriented silicon steel, is simple and feasible in process, is energy-saved and environment-friendly, is excellent in product performance, and can satisfy the performance requirements on the non-oriented silicon steel by the new energy vehicle driving motor.

Description

technical field [0001] The invention belongs to the technical field of electrical steel manufacturing, and in particular relates to a method for manufacturing high-strength non-oriented silicon steel for driving motors of new energy vehicles. Background technique [0002] New energy vehicles have three major advantages of environmental protection, saving, and simplicity. They are the inevitable trend of future automobile development. New energy vehicles currently being developed and used include hybrid electric vehicles (Hybrid EV) and electric vehicles (EV). Its working principle is to use The drive motor converts electrical energy into mechanical energy. As one of the core components of new energy vehicles, the drive motor has attracted more and more attention from researchers. Non-oriented silicon steel is the key material for manufacturing drive motors, which plays a huge role in the rotation of the motor, and the huge centrifugal force on the rotation can easily damage...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C22C38/12C21D8/12C21D1/26C21D1/74
CPCC21D1/26C21D1/74C21D8/1222C21D8/1233C21D8/1272C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18
Inventor 张晓明段军阳王郁倩刘曦何禛戴校高刘振宇王国栋
Owner NORTHEASTERN UNIV
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