Ultra-low iron loss non-oriented silicon steel and production method thereof

Abstract

The invention discloses an ultra-low iron loss non-oriented silicon steel and a production method thereof. The production method comprises the steps that adopting molten iron desulfurization, converter smelting and RH furnace refining sequentially for steel smelting, and finally obtaining molten steel which comprises, by mass percent, smaller than or equal to 0.003% of C, 2.8%-3.4% of Si, 0.1%-0.5% of Mn, 0.6%-1.3% of Al, smaller than or equal to 0.0015% of S, smaller than or equal to 0.0020% of N, smaller than or equal to 0.03% of P, smaller than or equal to 0.003% of Ti, smaller than or equal to 0.003% of V and smaller than or equal to 0.003% of Nb, the sum of Si and Al is larger than or equal to 3.80% and smaller than or equal to 4.15%, and the balance of Fe and inevitable impurities; continuously casting molten steel obtained by smelting into a continuous casting blank; heating the continuous casting blank, and performing multi-pass rolling to obtain a hot-rolled coil plate; shearing the two side parts of the hot-rolled coil plate; carrying out normalizing pickling, wherein the normalizing temperature ranges from 900 DEG C to 930 DEG C, and the normalizing time ranges from 30 s to 60 s; and obtaining the non-oriented silicon steel with the thickness of 0.35-0.5 mm through multi-pass cold rolling, wherein the reduction rate during first-pass cold rolling is larger than or equal to 37%, and the rolling speed ranges from 70 m / min to 180 m / min. The non-oriented silicon steel prepared by the method has ultralow iron loss and is not easy to break during cold rolling.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to a production method of ultra-low iron loss non-oriented silicon steel, and also relates to an ultra-low iron loss non-oriented silicon steel prepared by the production method. Background technique [0002] Non-oriented silicon steel is widely used as iron core material for motors and transformers, so it needs to have good magnetic properties, including lower iron loss and higher magnetic induction. In recent years, with the continuous improvement of motor energy efficiency and the strengthening of energy conservation and environmental protection awareness, the requirements for electrical efficiency have become higher and higher. One of the measures to improve electrical efficiency is to improve the magnetic properties of iron core materials and prepare lower iron Damaged non-oriented silicon steel. [0003] In order to obtain non-oriented silicon steel with lower iron ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an ultra-low iron loss non-oriented silicon steel and its production method, so as to solve the technical problems in the prior art that the cold-rolled broken strip rate is high and the yield rate is low when preparing low iron loss non-oriented silicon steel

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