Method for preparing high-silicon electric steel band material through rolling at medium and low temperature

Abstract

The invention provides a method for preparing a high-silicon electric steel band material through rolling at medium and low temperature and belongs to the technical field of metal material preparation and machining. The method is characterized by comprising the following steps of: using a strong (100) oriented columnar crystal structure high-silicon electric steel bar blank or plate blank prepared by adopting a directional solidification as a blank material; before rolling, performing thermal treatment on the bar blank or the plate blank by a heating, quenching and stress-removing processes; preserving the temperature of the thermally treated blank for 10 to 20 minutes at the temperature of 300 to 500 DEG C, and after the blank is taken out from a furnace, rolling the blank to the thickness of 1 to 3mm at medium temperature; and after washing the rolled plate blank with acid and drying the rolled plate blank, performing cold rolling on the plate blank at room temperature, strictly controlling the deformation degree at each time, and repeatedly rolling the plate blank to the thickness of less than 0.30mm to obtain the cold-rolled band material. The method has the advantages that: due to the adoption of the new process of 'oriented solidification, thermal treatment before rolling, rolling at the medium temperature, and rolling at the room temperature' to prepare the high-silicon electric steel band material, annealing in the middle process is not required, the process flow is short, and the production efficiency is high; and the prepared high-silicon electric steel band material is bright in the surface, good in the plate shape, few in side cracks and high in yield.

Description

[0001] Technical field: [0002] The invention relates to a method for preparing a high-silicon electrical steel strip, which belongs to the technical field of metal material preparation and processing, and in particular provides a medium-low temperature preparation and processing process for a high-performance, low-plasticity and difficult-to-process alloy strip. [0003] Background technique: [0004] As a key soft magnetic material in the fields of electric power, communication and national defense, electrical steel is widely used in the iron cores of various motors, transformers and other components, accounting for about 90% to 95% of the total magnetic materials. High-silicon electrical steel (containing 6.5wt% Si) compared with the current large-scale application of ordinary electrical steel (containing 3~4.2wt% Si) has low noise, low iron loss, and low energy consumption during operation, so it is used in high-frequency transformers , energy-saving motors and othe...

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the existing high-silicon electrical steel strip rolling forming technology that has long production process, complicated process, high energy consumption and low yield. It is not conducive to the low cost, high efficiency, and large-scale production of high-silicon electrical steel strips; when making full use of the directionally solidified columnar grain structure, the plastic processing performance of high-silicon electrical steel is significantly improved compared with ordinary equiaxed polycrystalline high-silicon electrical steel. On the basis of one characteristic, a special pre-rolling heat treatment method is adopted to further improve the plastic deformation performance of the alloy, and finally realize the medium and low temperature rolling of high-silicon electrical steel strip without hot rolling and intermediate annealing

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