Non-oriented silicon steel thin strip for super-efficient variable-frequency air conditioner compressor and manufacturing method of non-oriented silicon steel thin strip

Abstract

The invention discloses a non-oriented silicon steel thin strip for an ultra-efficient variable frequency air conditioner compressor and a manufacturing method of the non-oriented silicon steel thin strip, and belongs to the technical field of non-oriented silicon steel. The steel comprises the following components in percentage by weight: less than or equal to 0.003% of C, 2.0%-2.5% of Si, 0.15%-0.5% of Mn, 0.3%-0.7% of Als, 0.05%-0.11% of Sn, less than or equal to 0.003% of S, less than or equal to 0.03% of P, 0.002%-0.004% of B, 0.003%-0.005% of Ca, less than or equal to 0.003% of N, less than or equal to 0.003% of Ti and the balance of Fe and inevitable impurities, the ratio of Mn to S is controlled within 20-60, the ratio of B to N is controlled within 0.7-1.5, and the ratio of Ca to S is more than or equal to 1. In order to solve the problems existing in the prior art, alloy elements and segregation elements are added, heat treatment processes such as continuous casting, hot rolling, normalizing and continuous annealing are matched, and an excellent cold-rolled plate shape control technology is adopted, so that an efficient non-oriented silicon steel product with the thickness of 0.30-0.35 mm and the thin specification is obtained, and the high-performance non-oriented silicon steel has excellent magnetic performance and mechanical performance with the high yield ratio; and the high-standard requirements of high-efficiency variable-frequency air conditioner compressor motor magnetic performance and joint type stator high-speed blanking on mechanical performance and plate shape are met.

Description

technical field [0001] The invention belongs to the technical field of non-oriented silicon steel, and more specifically relates to a non-oriented silicon steel thin strip for an ultra-high-efficiency inverter air-conditioning compressor and a manufacturing method thereof. Background technique [0002] Non-oriented silicon steel is mainly used to produce iron cores for various rotating electrical machines. With the development of high-efficiency energy-saving and green production in the global manufacturing industry, as well as the development of the compressor field, high-efficiency energy-saving has become a consensus in the development of the motor industry. The requirements for miniaturization, miniaturization, and high performance are becoming more and more stringent. Some countries have successively formulated energy efficiency standards and energy efficiency labeling systems for electric motors, and clearly put forward the implementation methods and implementation scop...

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Problems solved by technology

[0005] After searching, there are existing patent publications on non-oriented silicon steel, such as Chinese Patent Publication No. CN1043283452A, which proposes a non-oriented silicon steel for frequency conversion and high-efficiency compressors, wherein the main alloy chemical composition of silicon steel: Si content 3.1-3.4%, Mn content 0.03- 0.1%, Als content ≤ 0.01%, Sn: 0.04-0.06%. This invention mainly reduces the iron loss by improving the control of the alloy composition Si content, but this method has a high Si content, which is not conducive to cold rolling. And the product has a low magnetic induction, B5000 is only 1.70T, which is difficult to meet the requirements of ultra-efficient air conditioner compressors

[0006] Another example is the Chinese Patent Publication No. CN104480383B, which proposes a production method of high magnetic induction non-oriented silicon steel for high-efficiency motors with a thickness of 0.35mm. ,, the invention combines normalization, continuous annealing and stress relief annealing with low alloy elements to obtain non-oriented silicon steel. Although the magnetic induction B50 can reach 1.78T, the iron loss of the product is relatively high, and the P1.5 / 50 can reach 3.0W / Kg, satisfactorily meeting the requirements of low iron loss of silicon steel for long-term operation of inverter air conditioners

[0007] Another example is the Chinese Patent Publication No. CN111304518A, which proposes a non-oriented electrical steel for inverter air conditioners and its manufacturing method. The content is 0.01-0.1%. Although the non-oriented silicon steel obtained by this invention has thin thickness and low iron loss, and the P1.5 / 50 is controlled within 2.15W / Kg, the magnetic induction is very low, and the B50 is only 1.65T, which cannot meet the requirements of high-efficiency frequency conversion. High magnetic induction requirements for air conditioners.

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