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High-strength electrical steel for high-speed motor and preparation method of high-strength electrical steel

A high-speed motor, high-strength technology, used in manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of high iron loss, increased iron loss, and reduced size, achieving high strength, low cost, and low iron loss. Effect

Inactive Publication Date: 2020-12-04
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology contains relatively high precious metals Cr and Ni, wherein the Cr content is 2.5% to 6%, and the Ni content is 1.05 to 3.5%, which greatly increases the cost of the prepared high-strength non-oriented electrical steel
[0006] Another example is the "Manufacturing Method of High-Strength Non-Oriented Silicon Steel for Drive Motors of New Energy Vehicles" (CN106435358A) patented technology. In addition to Si, 0.5-3wt% of Cr and 0.5-2wt% of Si are added to the electrical steel composition of this technology. Ni is also added with 0.08-0.15wt% Nb, and the high-strength non-oriented silicon steel produced by twin-roll strip continuous casting technology has a yield strength Rp0.2 of 600-780MPa and a magnetic induction B50 of 1.65-1.70T. But the iron loss is higher, P 1.0 / 400 28~38.2W / kg
The finished plate contains a certain amount of NbC second phase, which affects the recrystallization behavior of the steel and the volume fraction of (100) favorable texture, and the iron loss of the steel increases
[0007] "A method for preparing high-strength non-oriented silicon steel based on nano-Cu precipitation strengthening" (CN106282781B) patent technology, using the role of nano-Cu precipitation strengthening, while adding more Ni, the number of nano-Cu precipitation increases, the size decreases, and Adding 0.2-0.5wt% Cr to reduce the iron loss can greatly increase the strength while hardly affecting the magnetic properties. The high-strength silicon-free silicon steel has a yield strength of 640-750MPa prepared by twin-roll strip rolling method, but Its iron loss is higher, P 1.0 / 400 Reach 22.5~31.5W / kg

Method used

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  • High-strength electrical steel for high-speed motor and preparation method of high-strength electrical steel
  • High-strength electrical steel for high-speed motor and preparation method of high-strength electrical steel
  • High-strength electrical steel for high-speed motor and preparation method of high-strength electrical steel

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Effect test

Embodiment 1

[0034] A high-strength electrical steel for high-speed motors and a preparation method thereof. The preparation method described in this embodiment is:

[0035] The chemical composition of the high-strength electrical steel for high-speed motors is: Si is 3.2wt%; Mn is 0.5wt%; Als is 0.8wt%; Cr is 1.0wt%; Sn is 0.03wt%; P≤0.02wt%; N≤0.003wt%; S<0.003wt%; C<0.003wt%; the rest is Fe and unavoidable impurities.

[0036] Smelting according to the chemical composition of the high-strength electrical steel for high-speed motors, casting it into a slab at 1490°C, keeping the slab at 1100°C for 2 hours, and hot rolling it to a hot-rolled plate with a thickness of 1.8mm, The final rolling temperature is 800°C; the hot-rolled sheet is then normalized at 920°C for 4 minutes to obtain a normalized sheet with a uniform structure; the normalized sheet is pickled and then cold-rolled once, and the cold-rolled press 83% to obtain a cold-rolled sheet with a thickness of 0.3 mm; finally, the co...

Embodiment 2

[0040] A high-strength electrical steel for high-speed motors and a preparation method thereof. The preparation method described in this embodiment is:

[0041] The chemical composition of the high-strength electrical steel for high-speed motors is: Si is 3.0wt%; Mn is 1.1wt%; Als is 0.9wt%; Cr is 1.8wt%; Sn is 0.02wt%; Ce is 0.02wt%; P≤0.02wt%; N≤0.003wt%; S<0.003wt%; C<0.003wt%; the rest is Fe and unavoidable impurities.

[0042] Smelting according to the chemical composition of high-strength electrical steel for high-speed motors, casting into slabs at 1500°C, keeping the slabs at 1130°C for 1.5h, and hot-rolling to a hot-rolled plate with a thickness of 2mm, The final rolling temperature is 850°C; the hot-rolled sheet is then normalized at 940°C for 3 minutes to obtain a normalized sheet with a uniform structure; the normalized sheet is pickled and then cold-rolled once, and the cold-rolled press The amount is 84%, and the cold-rolled sheet with a thickness of 0.32mm is ...

Embodiment 3

[0046] A high-strength electrical steel for high-speed motors and a preparation method thereof. The preparation method described in this embodiment is:

[0047] The chemical composition of the high-strength electrical steel for high-speed motors: Si is 3.5wt%; Mn is 0.9wt%; Als is 0.5wt%; Cr is 0.06wt%; Sn is 0.05wt%; Ce is 0.03wt%; ≤0.02wt%; N≤0.003wt%; S<0.003wt%; C<0.003wt%; the rest is Fe and unavoidable impurities.

[0048] According to the chemical composition of the high-strength electrical steel for high-speed motors, it is smelted and cast into slabs at 1550°C. The slabs are kept at 1200°C for 1 hour and hot-rolled to a hot-rolled plate with a thickness of 2.5mm. The final rolling temperature is 900°C; the hot-rolled sheet is then normalized at 960°C for 2 minutes to obtain a normalized sheet with a uniform structure; the normalized sheet is pickled and then cold-rolled once, and the cold-rolled press 75% to obtain a cold-rolled sheet with a thickness of 0.35 mm; fi...

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Abstract

The invention relates to high-strength electrical steel for a high-speed motor and a preparation method of the high-strength electrical steel. According to the technical scheme, the high-strength electrical steel for the high-speed motor comprises the following chemical components: 2.8-3.5 wt% of Si, 0.2-1.50 wt% of Mn, 0.5-1.0 wt% of Als, 0-2.0 wt% of Cr, 0.02-0.10 wt% of Sn, 0-0.03 wt% of Ce, less than or equal to 0.02 wt% of P, less than or equal to 0.003 wt% of N, less than 0.003 wt% of S, less than 0.003 wt% of C, and the balance of Fe and inevitable impurities. The chemical components ofthe electrical steel are smelted and casted into a slab at 1450-1550 DEG C, the temperature is kept at 1100-1200 DEG C for 1-2 hours, hot rolling is carried out to obtain a hot-rolled plate with thethickness of 1.8-2.5 mm, and the finish rolling temperature is 800-900 DEG C; and normalizing treatment is carried out on the hot-rolled plate at 920-960 DEG C for 2-4 minutes, after acid pickling iscarried out, cold rolling is carried out until the thickness is 0.3-0.35 mm, and recrystallization annealing is carried out in a mixed atmosphere of nitrogen and hydrogen to obtain the high-strength electrical steel for the high-speed motor. The high-strength electrical steel for the high-speed motor has the characteristics of low cost, high strength and low iron loss.

Description

technical field [0001] The invention belongs to the technical field of electrical steel for high-speed motors. Specifically relates to a high-strength electrical steel for high-speed motors and a preparation method thereof. [0002] technical background [0003] A high-speed motor usually refers to a motor whose speed exceeds 10000r / min. High-speed motors, especially high-speed permanent magnet synchronous motors, are widely used in new energy vehicles, military industry, aviation and other fields due to their high torque, high power density, small size, light weight and wide speed range. High-speed motors generate large centrifugal force during high-speed rotation, so the electrical steel for high-speed motor rotors is required to have high strength to resist fatigue deformation. At the same time, electrical steel for high-speed motors is required to have high magnetic induction intensity and low iron loss. [0004] Using solid solution strengthening, precipitation strengt...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/34C21D1/26C21D1/74C21D6/00C21D8/12C21D9/00
CPCC21D1/26C21D1/74C21D6/002C21D6/005C21D6/008C21D8/1216C21D9/0081C22C38/001C22C38/002C22C38/004C22C38/005C22C38/008C22C38/04C22C38/06C22C38/34
Inventor 刘静付兵宋新莉程朝阳李兆振余春雷
Owner WUHAN UNIV OF SCI & TECH
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