Method for manufacturing electric steel with excellent longitudinal magnetic performance

Abstract

The invention discloses a method for manufacturing electric steel with excellent longitudinal magnetic performance, which adopts a process route of smelting, continuous casting, hot rolling, normalizing of a hot-rolled sheet, cold rolling and annealing, and is characterized in that: the temperature in the normalizing of the hot-rolled sheet is lower than Curie temperature of the steel, the heatingtemperature is between 700 and 760DEG C, and the normalizing is performed in a magnetic field with an applied field strength between 3,000 and 9,000e in the rolling direction. Under the action of themagnetic field, complex magnetic domains generated by the influence of lattice deformation, precipitation and micro-area defects in a material are oriented in micro magnetic areas in the outer magnetic field direction, partial micro-area structures are restored and changed because of the action of thermokinetics, magnetic domains vertical to the outer magnetic field direction are decreased, and magnetic domains parallel to the outer magnetic filed direction are increased, so the uniaxial anisotropy along the outer magnetic field direction is induced and the longitudinal magnetic performance of products is improved.

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...

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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

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