Non-oriented electrical steel for new energy vehicle and manufacture method thereof

Abstract

The invention discloses non-oriented electrical steel for a new energy vehicle and a manufacture method thereof, and relates to non-oriented electrical steel and the production method thereof. The production method comprises the following steps: step A, smelting; step B, continuous casting; step C, heating; step D, phosphorus removal; step E, rough rolling; step F, feeding into a hot rolling box to process; step G, finish rolling; step H, rolling; step I, primary cold-rolling; step J, intermediate annealing; step K, secondary cold-rolling; and step L, final annealing. The non-oriented electrical steel aims to overcome the defects that an existing production process has difficulty in meeting using requirements of the non-oriented electrical steel for the new energy vehicle, provides the non-oriented electrical steel for the new energy vehicle and the production method thereof which can produce the ultrathin non-oriented electrical steel for the new energy vehicle, and the ultrathin non-oriented electrical steel is low in iron loss under high frequency, and is good in high magnetic induction and surface quality.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a production method thereof, more specifically, to a non-oriented electrical steel for new energy vehicles and a production method thereof. Background technique [0002] Non-oriented electrical steel is a silicon-iron soft magnetic alloy with very low carbon content, and it is an indispensable and important material in electric power, electronics and military industries. Non-oriented electrical steel is the iron core material of the motor and generator rotor working in the rotating magnetic field, and requires good magnetic properties and process properties. In recent years, with the development of high-speed and miniaturized motors for new energy vehicles, higher requirements have been placed on the performance of non-oriented electrical steels, such as low iron loss and high magnetic induction at high frequencies. [0003] New energy vehicles—electric (EV) / hybrid electric vehicles (HEV) ha...

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Problems solved by technology

[0004] Patent publications such as CN 103882293A, CN 1611616A and CN 1888111A all use various techniques to develop non-oriented electrical steel, but their shortcomings are: (1) most of the finished products have a thickness of 0.5mm, and cold rolling The reduction rates are all greater than 70%, and when the cold rolling reduction rate is further increased, especially greater than 80%, the (111) texture increases rapidly, and the (100) texture is suppressed, which is extremely unfavorable to the magnetic induction and cannot meet the needs of new energy sources. High magnetic induction requirements for non-oriented silicon steel for automobiles; (2) Calcium treatment is used in the technical solutions of some patent applications. Although calcium treatment can modify inclusions, it cannot significantly reduce the number of inclusions; (3) Hot-rolled coils in the hot-rolling process It needs to be coiled at a high temperature above 700°C, resulting in dense oxide scales on the surface of hot-rolled coils, which increases the burden of pickling; (4) The technical solutions of some patent applications have low silicon content, which are medium and low grades, and the iron loss is relatively high. High, unable to meet the low iron loss requirements of non-oriented silicon steel for new energy vehicles; (5) Its magnet loss value under high frequency conditions cannot meet the use requirements of new energy vehicles

[0005] To sum up, in order to meet the requirements of low iron loss of non-oriented electrical steel used in new energy vehicles under high frequency, high-grade silicon steel must be used, but increasing the silicon content will lead to surface corrugated defects; and ultra-thin thickness must be required The cold rolling reduction rate increases, resulting in an increase in the (111) plane texture, which is unfavorable for magnetic induction

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