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High-strength non-oriented silicon steel based on solution strengthening and preparation method thereof

An oriented silicon steel, solid solution strengthening technology, applied in the field of metallurgy, can solve the problem of high frequency iron loss, achieve the effect of excellent product performance, improved mechanical and magnetic properties, and wide thickness specifications

Pending Publication Date: 2022-06-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its yield strength Rp 0.2 ≥540MPa, but higher frequency iron loss P 10 / 400 Can reach 60W / kg

Method used

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  • High-strength non-oriented silicon steel based on solution strengthening and preparation method thereof

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Experimental program
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preparation example Construction

[0032] In the specific implementation process, the present invention provides a method for preparing high-strength non-oriented silicon steel based on solid solution strengthening, including: vacuum smelting→casting and forging, hot rolling and normalizing heat treatment (or thin strip continuous casting)→pickling and cold rolling → Recrystallization annealing. When testing the performance of high-strength non-oriented silicon steel based on solid solution strengthening, the magnetic property test uses MATA magnetic material automatic testing system V4.0 to conduct magnetic measurement and data analysis and recording of experimental materials, and use MATS-2010M silicon steel measuring device to measure non-oriented silicon steel. Magnetic properties of silicon steel monoliths. Iron loss P 10 / 400 is the frequency of 400Hz alternating magnetic field, the specific total loss measured by the magnetic polarization at 1.0T, the magnetic induction B 50 is the magnetic polarization...

Embodiment 1

[0036] In the present embodiment, a method for manufacturing a conventional hot rolling process of high-strength non-oriented silicon steel based on solid solution strengthening, the specific steps are as follows:

[0037]1) Using raw materials with a purity of more than 99.99wt.%, smelting molten steel according to the set composition in a vacuum induction furnace, its chemical composition is: Si 4.8wt.%, P 0.05wt.%, Mn 0.1wt.%, Al 0.2 wt.%, C 36ppm, N 20ppm, O21ppm, S 12ppm, the rest are Fe. Under the condition of vacuum degree of 10Pa, vacuum degassing for 40min, smelting temperature is 1535℃, non-oriented silicon steel molten steel is obtained, cast into ingot and forged into billet at 1150℃.

[0038] 2) The billet then enters the heating furnace, the furnace temperature is 1150°C, the holding time is 120min, and the billet is hot rolled to a thickness of 2mm, and the final rolling temperature is 975°C.

[0039] 3) Carry out normalization heat treatment at 1100°C, and con...

Embodiment 2

[0045] In the present embodiment, a method for manufacturing a conventional hot rolling process of high-strength non-oriented silicon steel based on solid solution strengthening, the specific steps are as follows:

[0046] 1) Using raw materials with a purity of more than 99.99wt.%, smelting molten steel according to the set composition in a vacuum induction furnace, its chemical composition is: Si 4.5wt.%, P 0.10wt.%, Mn 0.3wt.%, Al 0.5 wt.%, C 32 ppm, N 23 ppm, O 18 ppm, S 13 ppm, rest Fe. Under the condition of vacuum degree of 10Pa, vacuum degassing for 40min, smelting temperature of 1500℃, to obtain non-oriented silicon steel molten steel, cast into ingot and forged into billet at 1125℃.

[0047] 2) The billet then enters the heating furnace, the heating furnace temperature is 1100°C, the holding time is 120min, and the billet is hot rolled to a thickness of 2mm, and the final rolling temperature is 950°C.

[0048] 3) Carry out normalization heat treatment at 1050°C, and...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to high-strength non-oriented silicon steel based on solution strengthening and a preparation method of the high-strength non-oriented silicon steel. The non-oriented silicon steel comprises the following chemical components in percentage by weight: 2.8-4.8% of Si, 0-0.2% of P, 0-0.5% of Mn, 0-0.5% of Al, less than or equal to 100ppm of (C + N + O + S) and the balance of Fe. The manufacturing method of the non-oriented silicon steel comprises the steps of vacuum smelting, casting forging, hot rolling machining and normalizing heat treatment (or thin-strip continuous casting), acid pickling and cold rolling machining and recrystallization annealing. According to the prepared high-strength non-oriented silicon steel for the new energy automobile driving motor rotor, the thickness ranges from 0.20 mm to 0.50 mm, the magnetic induction intensity B50 ranges from 1.65 T to 1.75 T, the P10 / 400 ranges from 10 W / kg to 30 W / kg, the yield strength Rp0.2 ranges from 450 MPa to 620 MPa, the tensile strength Rm ranges from 620 MPa to 750 MPa, the ductility A ranges from 12% to 24%, and the requirement of a user for the performance of the non-oriented silicon steel for the new energy automobile driving motor can be met.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength non-oriented silicon steel based on solid solution strengthening and a preparation method thereof. Background technique [0002] With the development of aerospace, flywheel energy storage, power tools, centrifugal compressors, micro-turbine generators and other industries, there are more and more applications of high-speed motors with rotor speeds up to tens of thousands or even hundreds of thousands of revolutions per minute. The rotor core is difficult to withstand the centrifugal force generated by its high-speed rotation, which puts forward higher requirements on the strength of non-oriented electrical steel. However, the magnetic properties and mechanical properties of non-oriented electrical steel are contradictory. The means of improving mechanical properties usually reduce the magnetic properties. Therefore, the development of high-strength ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/04C21D8/12C21D1/26C21D1/74B22D11/06
CPCC22C38/02C22C38/04C22C38/06C22C38/002C22C33/04C21D8/1216C21D8/1222C21D8/1233C21D8/1261C21D8/1272C21D1/26C21D1/74B22D11/0622Y02P10/20
Inventor 方烽侯迪文胡明睿朱英杰沈校张元祥王洋李振垒袁国王国栋
Owner NORTHEASTERN UNIV
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