A kind of non-oriented silicon steel thin strip for ultra-high-efficiency inverter air-conditioning compressor and its manufacturing method

Abstract

The invention discloses a non-oriented silicon steel thin strip for an ultra-efficient frequency conversion air conditioner compressor and a manufacturing method thereof, belonging to the technical field of non-oriented silicon steel. The present invention includes the following components by weight: C≤0.003%, Si: 2.0%-2.5%, Mn: 0.15%-0.5%, Als: 0.3%-0.7%, Sn: 0.05%-0.11%, S≤0.003 %, P≤0.03%, B: 0.002%~0.004%, Ca: 0.003%~0.005%, N≤0.003%, Ti≤0.003%, the rest are Fe and inevitable impurities, and the Mn / S ratio is controlled at 20 Within the range of ~60, the B / N ratio is controlled at 0.7 to 1.5, and the ratio of Ca / S is greater than or equal to 1. In order to solve the problems existing in the prior art, the present invention achieves 0.30-0.35 by adding alloying elements and segregation elements, cooperating with heat treatment processes such as continuous casting, hot rolling, normalization and continuous annealing, and excellent cold-rolled shape control technology. High-efficiency non-oriented silicon steel products with a thin thickness of mm have excellent magnetic properties and mechanical properties of high yield-strength ratio, and meet the high standards of high-efficiency inverter air-conditioning compressor motor magnetic properties and high-speed punching of articulated stators for mechanical properties and plate shape. Require.

Description

technical field [0001] The invention belongs to the technical field of non-oriented silicon steel, and more particularly relates to a non-oriented silicon steel thin strip for an ultra-high-efficiency variable frequency air conditioner compressor and a manufacturing method thereof. Background technique [0002] Non-oriented silicon steel is mainly used for the production of various rotating motor cores. 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 and energy-saving has become the consensus of 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 scope of impleme...

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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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