A method for producing high-grade electrical steel products with low cost and high efficiency

Abstract

The invention relates to a method for low-cost high-efficiency production of a high-grade electrical steel product. The method comprises the following steps: 1) arranging a multi-roller straightener after a normalizing annealing procedure, wherein straightening rollers employs large-roughness roller surfaces; 2) controlling the elongation percentage of a high-grade electrical steel band to be 0.5to 10%; 3) controlling the surface roughness of the steel band to be 1.0 to 4.0 [mu]m; 4) carrying out primary rolling pass with a final-pass roller having a roughness meeting requirements; and 5) after rolling, transferring the high-grade electrical steel band to a subsequent heat treatment procedure for a finished product. According to the invention, multi-roller straightening is used for replacing shot blasting; the surface of the high-grade electrical steel band is repeatedly bent and stretched by the multi-roller straightener, so scale is fully fragmented; a concave-convex surface can increase the acid leaching area during pickling and allows rolling effect of large-roughness rollers to be achieved, so requirements on initial-pass aged rolling are totally met; and the final-pass roller with appropriate surface roughness is used as a primary-pass roller during primary-pass rolling, so consumption in production is lowered, and process flow is shortened.

Description

technical field [0001] The invention relates to the technical field of electrical steel production, in particular to a method for producing high-grade electrical steel products with low cost and high efficiency. 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. They are important metal functional soft magnetic materials. In the production process of high-grade electrical steel products, the hot-rolled coils need to be processed by normalization, shot blasting, pickling, rolling and other processes. The process is long and the production consumption is large; especially after normalization, the high-silicon steel strip The dense and highly cohesive silicon-containing or silicon oxide scale on the surface needs further treatment. Shot blasting is often used to break the surface iron scale, and sufficient pickling is used to ensure the su...

AI Technical Summary

Problems solved by technology

In the production process of high-grade electrical steel products, the hot-rolled coils need to be processed by normalization, shot blasting, pickling, rolling and other processes. The process is long and the production consumption is large; especially after normalization, the high-silicon steel strip The dense and highly cohesive silicon-containing or silicon oxide scale on the surface needs further treatment. Shot blasting is often used to break the surface iron scale, and sufficient pickling is used to ensure the surface quality of the strip, resulting in consumption of shot blasting materials and pickling. Huge; in order to meet the specifications of the finished product, it is necessary to use a large-roughness roll for the first pass of aging rolling in the subsequent rolling process, and finally use the corresponding smooth roll according to the surface quality requirements of the finished product, resulting in roll preparation and processing. An increase in the amount of auxiliary work