High-frequency low-iron-loss excellent-magnetic-property non-orientated silicon steel strip and production method thereof

Abstract

The invention provides a high-frequency low-iron-loss excellent-magnetic-property 0.10-0.25mm non-orientated silicon steel strip which contains the following components in percentage by weight: 0.001-0.005% of C, 2.05-3.75% of Si, 0.150-0.850% of Als, at most 0.003% of N, at most 0.005% of S, at most 0.02% of P, 0.15-0.30% of Mn, 0.01-0.08% of Sn, 2.5-3.5% of Cr, 0.05-0.1% of Cu, at most 0.003% of Ti, and the balance of Fe and inevitable impurities. The content control range of acid-soluble aluminum and silicon is as follows: 2.2<Als(%)+Si(%)<4.6. The invention lowers the iron core loss under medium/high-frequency, and especially 1000Hz or above ultrahigh-frequency service conditions, stabilize the magnetic property in the operating state, lower the iron loss in the medium-high frequency or high-frequency state, enhance the mechanical strength of the strip product, and optimize the shape of strip, lamination factor and punching performance.

Description

technical field [0001] The invention relates to the technical field of silicon steel production, in particular to a production method of non-oriented silicon steel strips. Background technique [0002] For the production of non-oriented silicon steel sheets, the rotor cores of power frequency and intermediate frequency motors produced in the past and now mainly have a thickness of 0.50mm and 0.35mm as the basic specifications. Under the environment of emission reduction and consumption reduction, non-oriented silicon steel sheets of these specifications are increasingly unable to meet the manufacturing and research and development of high-performance motors and other precision magnetic materials. In order to improve the performance of non-oriented silicon steel sheets under medium and high frequency working conditions, Japanese Patent Laid-Open No. 6-188115 once proposed to control the C content by weight % to 0.001, Mn0.1-1.5, Si+Al=1.0-4.5, etc. Non-oriented thin strip 0....

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Problems solved by technology

[0002] For the production of non-oriented silicon steel sheets, the rotor cores of power frequency and intermediate frequency motors produced in the past and now mainly have a thickness of 0.50mm and 0.35mm as the basic specifications. In the environment of emission reduction and consumption reduction, non-oriented silicon steel sheets of these specifications are increasingly unable to meet the requirements for the manufacture and development of high-performance motors and other precision magnetic materials.

In order to improve the performance of non-oriented silicon steel sheets under medium and high frequency working conditions, Japanese Patent Laid-Open No. 6-188115 once proposed to control the C content by weight % to 0.001, Mn0.1-1.5, Si+Al=1.0-4.5, etc. Non-oriented thin strip 0.3mm specification for basic elements and the control P≤0.20, Mn0.1~0.5, Al≤0.004 proposed by Japanese Patent Laid-Open No. 6-73511 to produce non-oriented thin strip 0.3mm relatively unchanged According to the standard method, the iron loss P at the middle and high frequency of 400Hz 1.0 / 400 Compared with the conventional thickness of 0.35mm thick non-oriented silicon steel sheet, it is about 2.5~3.5W / Kg lower, and the magnetic induction is B 2000 Increased by 0.1-0.2T, the tensile strength of the material has also been improved, but the service performance at higher frequencies such as 1000Hz still needs to be improved

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