A method for improving the magnetic anisotropy of high-grade non-oriented silicon steel

Abstract

The invention relates to a method for improving the magnetic anisotropy of high-grade non-oriented silicon steel. The rough hot rolling adopts the 1+3 rolling method, the temperature of the R1 rolling mill is controlled at 1080-1120°C, and the temperature of the first pass of the R2 rolling mill is controlled at 1060°C. ~1100°C, the temperature of the second pass of the R2 rolling mill is controlled at 1030~1070°C, the temperature of the third pass of the R2 rolling mill is controlled at 1000~1040°C; the reduction rate of the R1 rolling mill is 20~25%, and the first pass of the R2 rolling mill is reduced The reduction rate of the second pass of the R2 rolling mill is 35-40%, and the reduction rate of the third pass of the R2 rolling mill is 45-50%. The strip steel tension in the annealing furnace is 2-5KN, and the strip speed is 65-5KN. 75m / min, annealing temperature 900~950℃. The invention obtains specific crystal structure and texture components, shortens the on-line time from steel billet exiting the heating furnace to finishing rolling, reduces temperature drop, reduces deformation resistance of finishing rolling, and reduces production accidents such as steel jamming.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for improving the magnetic anisotropy of high-grade non-oriented silicon steel. Background technique [0002] High-grade electrical steel products are widely used in the manufacture of high-end, precision, and sharp-point motors and iron cores for instruments and meters, as well as in the field of large-scale generators. The motor works in the running state, and it is required that the difference in the magnetic and isotropic properties of the electrical steel plate should not be too large. In particular, high-grade and high-brand products are often used in the field of large motors, which have stricter requirements on the anisotropy of electrical steel. [0003] In the production process of high-grade electrical steel products, with the increase of Si content, the columnar grains are coarse and the proportion increases, intergranular segregation of residual ele...

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Problems solved by technology

[0005] "A Production Method for Improving the Electromagnetic Anisotropy of Electrical Steel Products" (CN201610562185.4), mainly achieves the purpose of improving the magnetic anisotropy by controlling the strip elongation and heating rate during annealing; but it is mainly for medium and high grades Non-oriented silicon steel is effective for silicon, but the effect is not obvious for non-oriented silicon steel with a silicon content greater than 2.90%

[0006] Northeastern University published "A Preparation Method for Thin Strip Continuous Casting Low Magnetic Anisotropy Non-Oriented Silicon Steel" (CN201810081918.1), which mainly adopts thin strip continuous casting technology, controls hot rolling reduction rate and other processes, and adds Sn and other elements at the same time , to achieve the purpose of producing non-oriented silicon steel with low magnetic anisotropy; this invention is suitable for non-oriented silicon steel with silicon content less than 2.0%, adopts thin strip continuous casting technology, advanced technology but not suitable for large-scale production process of conventional equipment

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