Cold rolling method for high-silicon steel with Si content equal to or higher than 2.5%

Abstract

The invention relates to a cold rolling method for high-silicon steel with the Si content equal to or higher than 2.5%. The cold rolling method includes uncoiling blank steel coils, then directly loading and rolling the blank steel coils by the aid of six-roller rolling mills and carrying out cold rolling by the aid of single-cold-rolling processes or double-cold-rolling processes; carrying out technological lubrication and cooling by means of emulsion spraying in rolling procedures; carrying out reeling after rolling is completed. The flow of emulsion on inlet sides of pass is 1000-6000 L / min, flow of emulsion on outlet sides of the pass is completely cut off, and the rolling deformation temperatures of the pass are 100-300 DEG C under the control. The cold rolling method has the advantages that cold rolling can be carried out on the high-silicon steel with the Si content equal to or higher than 2.5% by the aid of the conventional six-roller rolling mills and can be continuously rolled by the aid of the six-roller rolling mills without frequent roller change, and accordingly the production efficiency can be improved by 30%; rolling deformation zones of the six-roller rolling millsare long in cold rolling procedures, the six-roller rolling mills are low in deformation speed, dramatic plastic deformation can be prevented, rolled pieces are free of strip shape quality defect, and products are excellent in surface quality.

Description

technical field [0001] The present application relates to a method for rolling silicon steel, in particular to a method for cold rolling ≥ 2.5% Si high-silicon steel. Background technique [0002] With the increase of silicon content, the magnetism and resistivity of silicon steel are improved, and the iron loss is greatly reduced. However, when the silicon content is ≥ 2.0%, the deformation resistance during cold rolling is large, plastic deformation is difficult, and belt breakage accidents are prone to occur during cold rolling. , It is not easy to cold-roll through conventional four-high or six-high pickling and rolling mills. Therefore, high-grade non-oriented silicon steel and oriented silicon steel with ≥2.5% Si and high silicon content are generally reversibly cold-rolled in a 20-high rolling mill; however, due to the complex structure of the roll system, the production and maintenance of the 20-high rolling mill is difficult and frequent roll changes , the producti...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a method for cold-rolling ≥2.5% Si high-silicon steel, using a conventional six-high rolling mill to achieve cold-rolling ≥2.5% Si high-silicon steel, with high production efficiency, precise shape control, and surface quality Good, to solve the current problems of low production efficiency and poor shape of thin gauge high silicon steel