A kind of production method of hot-rolled silicon steel strip

Abstract

The invention belongs to the technical field of hot-rolled silicon steel and discloses a hot-rolled silicon steel strip production method which comprises the following steps: acquiring the sawtooth width and the lamination number of a strip edge; selecting rolling processes according to the sawtooth width and the lamination number; under the circumstance that the sawtooth width is less than or equal to k and the lamination number is less than or equal to m1, performing the rolling operation according to the sequence of a normalizing process, a pickling process and a cold rolling process; underthe circumstance that the sawtooth width is less than or equal to k and the lamination number is less than or equal to m2, performing the rolling operation according to the sequence of a pre-trimmingprocess, the normalizing process, the pickling process and the cold rolling process; and under the circumstance that the sawtooth width is greater than k and the lamination number is greater than m2,performing the rolling operation according to the sequence of the normalizing process, the pickling process, the pre-trimming process and the cold rolling process. The hot-rolled silicon steel stripproduction method provided by the invention has the beneficial effects that through the elimination of a trimming process, the situation that edge cracks are formed due to the shear stress can be avoided, the problem about strip breakage caused by the edge cracks in the cold rolling process can be solved, and the yield can be improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a production method of a hot-rolled silicon steel strip. Background technique [0002] The conventional production process of hot-rolled silicon steel strip is: normalization, pickling, edge trimming, and cold rolling. However, due to the shear internal stress after edge trimming cannot be eliminated, coupled with the high silicon content, the deformation resistance during cold rolling is large, and plastic deformation is extremely difficult; and the normalization temperature is as high as 930-1190 ° C, the grain size is large, and the plasticity of the material is sharp. Decrease, poor cold rolling processability. In the rolling process, after the 1st and 2nd passes of rolling, under the action of edge shear stress, the edge cracks are dense, and under high tension, the cracks at the cracks are extremely sensitive and rapidly expand, resulting in frequent brittle fracture...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for producing hot-rolled silicon steel strips, which solves the technical problems of high risk of broken strips, low yield and low production efficiency of silicon steel hot-rolled steel strips in the prior art