Silicon steel thin strip and manufacturing method thereof

Abstract

The invention discloses a silicon steel thin strip and a manufacturing method thereof. The method comprises the steps that material section is carried out, wherein a casting blank is selected, the casting blank comprises chemical compositions including, by mass, not larger than 0.003% of C, 3.10%-3.35% of Si, 0.20%-0.80% of Al, 0.10%-0.30% of Mn, not larger than 0.015% of P, not larger than 0.0020% of N, not larger than 0.0010% of S, not larger than 0.0020% of Ti and the balance Fe, the sum of the N, the S and the Ti is smaller than or equal to 45ppm, and the sum of the Si and 0.8Al is largerthan or equal to 3.7%; heating is carried out, wherein the casting blank is heated, and the heating temperature is controlled at 1000 DEG C-1200 DEG C; hot rolling is carried out, wherein the castingblank is subjected to hot rolling to form a silicon steel strip being 2.0 mm or below; normalizing is carried out, wherein the silicon steel strip obtained after hot rolling is subjected to normalizing; cold rolling is carried out, wherein the silicon steel strip obtained after normalizing is subjected to primary cold rolling to form the silicon steel thin strip being 0.25 mm; and continuous annealing is carried out, wherein the silicon steel thin strip obtained after cold rolling is subjected to continuous annealing. By means of the silicon steel thin strip and the manufacturing method thereof, optimization of the iron loss of the silicon steel thin strip at the power frequency (50 Hz), the intermediate frequency (400 Hz) and the high frequency (1000 Hz) is realized; and meanwhile, the efficiency of a new energy vehicle driving motor at different rotating speeds is improved. No microalloying elements or precious metal elements are added, and the production cost is lower.

Description

technical field [0001] The invention relates to the technical field of silicon steel materials, in particular to a thin silicon steel strip and a manufacturing method thereof. Background technique [0002] Due to factors such as environmental pollution and resource shortage, new energy vehicles have gradually emerged due to their environmental protection and energy saving characteristics. Compared with ordinary motors, new energy vehicle drive motors have a higher speed; in addition, due to their constant power and wide-band operating characteristics, not only the iron loss of silicon steel materials at 50 Hz is required, but also the iron loss at 400 Hz, and even 1000 Hz. High requirements, which require the thickness of the silicon steel used for the drive motor core to be thinner, and at the same time ensure that it has excellent magnetic properties in a wide frequency range. [0003] At present, domestic public reports on non-oriented silicon steel thin strips with a th...

AI Technical Summary

Problems solved by technology

With the increase of frequency, the proportion of eddy current loss increases, and there are certain differences in the control process of high frequency iron loss and power frequency iron loss. Under the same process conditions, power frequency iron loss is good, and high frequency iron loss is poor, so it is difficult to Taking into account; the iron loss control process of silicon steel with different thickness and composition is not the same

Therefore, only studying the iron loss influencing factors at a certain frequency, or only improving the iron loss at a certain frequency has certain limitations on the improvement of motor efficiency

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