A kind of non-oriented silicon steel for high-speed motor rotor with yield strength ≥ 600mpa and its production method

Abstract

The invention discloses a non-oriented silicon steel for a high-speed motor rotor with a yield strength of 600 Mpa and a production method thereof. The non-oriented silicon steel comprises the following chemical components of, by weight percentage, 0.001-0.003% of C, 2.6-3.4% of Si, 0.20-0.60% of Mn, less than or equal to 0.005% of P, less than or equal to 0.005% of S, 0.75-0.95% of Als, 0.002-0.006% of N, and 0.053-0.20% Nb. The production method comprises the following steps of 1, smelting by a converter and casting into a blank; 2, heating a continuous casting blank; 3, carrying out conventional rough rolling and finish rolling; 4, carrying out normalizing; 5, carrying out cold rolling after pickling; and 6, carrying out continuous annealing. According to the non-oriented silicon steelfor the high-speed motor rotor with the yield strength of greater than or equal to 600 Mpa and the production method thereof, the thickness of a finished product is not more than 0. 35mm, and the yield strength of the finished product is greater than or equal to 600 Mpa, the tensile strength of the finished product is greater than or equal to 700 Mpa, P1.0 / 400 is less than or equal to 35 W per Kg,and B5000 is greater than or equal to 1.60T.

Description

technical field [0001] The invention relates to a non-oriented electrical steel manufacturing technology, in particular to a non-oriented silicon steel for high-speed rotors and a production method thereof, which is suitable for the production of high-strength non-oriented silicon steel with a finished product thickness not exceeding 0.35mm. Background technique [0002] The permanent magnet synchronous motor is mainly composed of a stator with windings and a rotor with permanent magnets. The permanent magnets embedded in the rotor are the mainstream. It is called an IPM motor and is a motor with an intelligent power module. [0003] At present, due to the rapid development of electronic technology, the rotational speed of motors used in mechanical equipment is developing in the direction of being able to be controlled arbitrarily to achieve high speed. The electromagnetic steel plate used as the iron core material in the motor is no longer required to use the frequency of 5...

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Problems solved by technology

Although the final performance obtained by this method can meet the requirements of high strength and low iron loss, the cost of the alloy is very high due to the addition of more than 0.3% of the precious metal Ni

And too high alloy content will lead to more difficult cold rolling, which needs to be produced by means of warm rolling, which is not conducive to mass production

[0022] The Chinese patent application number is 200910049782.7, which provides a manufacturing method of 500Mpa grade cold-rolled magnetic pole steel. The composition weight percentage content is: C: 0.07~0.1%, Si: 0.18~0.31%, Mn: 1.00~1.50% , P≤0.02%, S≤0.007%, O≤0.004%, N≤0.004%, Nb: 0.046~0.06%, Ti≤0.003%, V: 0.050~0.070%, the balance is Fe and unavoidable impurities; Performance: Rm≥570MPa, B5000≥1.570T, but this steel is used as magnetic pole steel, and the control of iron loss is not considered. From the perspective of patented composition, due to the use of low-silicon and high-manganese composition system, its iron loss will be very High, unable to meet the requirements of high-speed rotors to maintain low iron loss at high frequencies, it can only be used as magnetic pole steel

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