A method of manufacturing electrical steel with excellent longitudinal magnetic properties

Abstract

The invention discloses a method for manufacturing electrical steel with excellent longitudinal magnetic properties. The process route adopted is: smelting, continuous casting, hot rolling, hot-rolled sheet normalization, cold rolling and annealing, and is characterized in that the hot-rolled sheet normalization treatment The temperature is lower than the Curie temperature of steel, the heating temperature is 700-760°C, and the normalization treatment is carried out in a magnetic field with an applied field strength of 3000-9000Oe and a rolling direction. Under the action of a magnetic field, the complex magnetic domains generated in the material due to lattice distortion, precipitates, and micro-domain defects are oriented in the direction of the external magnetic field in the micro-magnetic domain, and part of the micro-domain structure can be repaired and changed due to thermodynamic effects. At the same time, the magnetic domains perpendicular to the direction of the external magnetic field are reduced, and the magnetic domains parallel to the direction of the external magnetic field are increased, thereby inducing uniaxial anisotropy along the direction of the external magnetic field and improving the longitudinal magnetic properties of the product.

Description

technical field [0001] The invention relates to a manufacturing method of electrical steel strip (plate), in particular to a manufacturing method of electrical steel for obtaining excellent longitudinal magnetic properties. Background technique [0002] Electrical steel is an important metal functional material, which is used to prepare the iron core of the electromagnetic conversion carrier and is used in various fields of the national economy. In its application process, the iron core often needs directional magnetic conduction to play the important functions of voltage conversion, frequency conversion, and signal processing. For example, non-oriented electrical steel is often used to make micro-miniature transformers, voltage stabilizers, current stabilizers and signal processing chips through longitudinal cutting; while grain-oriented electrical steel is more widely used because of its unique longitudinal orientation characteristics, and is often used to manufacture larg...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for manufacturing electrical steel products with excellent longitudinal magnetic properties, which solves the problem that the nucleation and growth of each orientation grain are difficult to control during the normalization treatment of hot-rolled sheets, reduces the difficulty of the manufacturing process, and reduces the production cost , improve production efficiency, and meet users' higher requirements for unidirectional magnetic performance

Images