Method for preparing oriented silicon steel with asymmetrical rolling technique

Abstract

The invention relates to a method for preparing oriented silicon steel with an asymmetrical rolling technique for a roughing mill or a finishing mill. The method is characterized in that an asymmetrical rolling mode is comprehensively introduced in the rough rolling and finish rolling process of hot rolling: 1, all passes or the first two passes of the rough rolling stage adopt asymmetrical rolling and all passes or the last pass of asymmetrical rolling of the finish rolling; and 2, all passes or the first two passes of the rough rolling stage adopt asymmetrical rolling and all passes or the first pass and the last pass of asymmetrical rolling of the finish rolling. The method is as follows: 1) when the rotation speeds of working rolls are same, the asymmetry is realized through the difference of the diameters of a top working roll and a bottom working roll; 2) when the diameters of the top working roll and the bottom working roll are same, the asymmetry is realized through the difference of the rotation speeds of the working rolls; 3) when the diameters of the top working roll and the bottom working roll are same and the rotation speeds are same, the asymmetry is realized by changing the friction coefficient of the top and bottom working roll surfaces and a rolling piece; the circumferential speed ratio of the top working roll and the bottom working roll of an asymmetrical mill is 1:1.01-1:1.30, the total reduction rate of the rough rolling is at least 85 percent, and the pass reduction rate is 20-40 percent; and the total reduction rate of the finish rolling is at least 90 percent, and the pass reduction rate is 20-40 percent. The oriented silicon steel comprises the following ingredients by weight percent: 0.03-0.08 percent of C, 2.8-6.5 percent of Si, 0.05-0.2 percent of Mn, 0.013-0.035 percent of S, 0.01-0.05 percent of Al, 0.045-0.01 percent of N, at most 0.03 percent of P, 0.05-0.5 percent of Cu and the balance of Fe and other impurity elements.

Description

technical field [0001] The invention belongs to the production technology of oriented silicon steel in the field of metal processing, and in particular relates to a method for preparing GO and Hi-B two kinds of oriented silicon steel by means of asynchronous hot rolling. Background technique [0002] Oriented silicon steel is the main material for preparing various types of transformer cores. It requires high magnetic induction and low iron loss. This requires the development of secondary grains of oriented silicon steel strips and accurate grain orientation. [0003] The preparation of grain-oriented silicon steel includes various processes such as smelting, continuous casting, hot rolling, normalization, cold rolling, decarburization annealing, coating of release agent, high temperature annealing and insulating coating. According to the difference of magnetic induction value, it is divided into GO steel and Hi-B A kind of grain-oriented silicon steel has its own requiremen...

AI Technical Summary

Problems solved by technology

However, there is no relevant report on the introduction of asynchronous rolling technology in the production of hot-rolled grain-oriented silicon steel.

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