High magnetic induction orientated high-silicon steel plate thin strip and preparation method thereof

Abstract

The invention discloses a high magnetic induction orientated high-silicon steel plate thin strip and a preparation method thereof. The thin strip comprises the following ingredients: less than or equal to 0.04% of C, 5.0-6.7% of Si, 0.05-0.2% of Mn, 0.015-0.04% of Als, less than or equal to 0.2% of Nb, less than or equal to 0.1% of V, less than or equal to 0.5% of Cu, 0.006-0.010% of N, 0.007-0.02% of S and the balance of Fe and impurities. The method comprises the following steps that: carrying out hot rolling on a plate blank obtained by casting, carrying out acid pickling on a hot rolling plate to remove an oxidization layer, and then, carrying out warm rolling; then, carrying out decarburizing annealing on a cold rolling thin plate; carrying out nitridation processing, and coating thesurface of the steel strip with separant, and carrying out secondary recrystallization annealing and purification annealing; and finally, carrying out flattening stretching annealing. By use of the thin strip, the heating temperature of the plate blank is lowered, inhibitor behaviors and recrystallization tissues are regulated and controlled, so that the harmonious collocation of an inhibition force-tissue-texture in a secondary recrystallization process is realized, the high magnetic induction orientated high-silicon steel plate thin strip with sharp Goss ([110](001)) texture characteristicscan be produced on a large scale, production cost is greatly lowered, and the thin strip has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high magnetic induction oriented high silicon steel strip and a preparation method thereof. Background technique [0002] High-silicon steel generally refers to an iron-silicon alloy with a Si content greater than 4.5 wt%. With the increase of Si content, the magnetic permeability of oriented high-silicon steel increases, the resistivity increases, and the eddy current loss decreases, which can significantly reduce the quality and volume of electrical components and improve electrical efficiency. Especially when the Si content increases to 6.5wt%, the magnetostriction coefficient tends to zero, which can significantly reduce the noise of the high-frequency transformer. Therefore, oriented high-silicon steel is an ideal iron core material with low noise and low iron loss, especially in the field of high-frequency soft magnetic materials, which has a good applicat...

AI Technical Summary

Problems solved by technology

[0006] 2) The lower slab heating temperature and the shrinkage of the austenite phase region lead to insufficient precipitation of traditional MnS, MnSe, AlN and other inherent inhibitors, which have a weak inhibitory effect on the matrix grains;

[0007] 3) The supplementary grain boundary segregation elements (Sn and Sb) will deteriorate the plasticity, so the addition amount is limited, and the supplementary inhibition effect is weak

The existing preparation technology is difficult to achieve the coordination of organization, inhibitor and texture, so the magnetic induction intensity and secondary recrystallization sharpness are low

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