Non-oriented electrical steel plate with excellent high-frequency iron losses and manufacturing method of non-oriented electrical steel plate

Abstract

The invention discloses a non-oriented electrical steel plate with excellent high-frequency iron losses. The non-oriented electrical steel plate comprises chemical elements including, by mass percent,larger than 0% and smaller than or equal to 0.003% of C, 0.1-3.5% of Si, 0.1-2.0% of Mn, smaller than or equal to 0.003% of O, smaller than or equal to 0.005% of S, 0.0005-0.01% of Ca, 0.003-0.2% ofSn, 0.1-2.0% of Al, and the balance Fe and other inevitable impurities. In addition, the invention further discloses a continuous annealing process of the non-oriented electrical steel plate with excellent high-frequency iron losses. The continuous annealing process comprises the following steps: heating cold-rolled strip steel from the room temperature to an intermediate heat preservation temperature T<preservation temperature> at a heating speed of 50-800 DEG C / s, and and keeping the temperature for 10-60 seconds, wherein the equation is that T<preservation temperature> is equal to the sum of T<Curie temperature> + 120-180 DEG C; and then heating the cold-rolled strip steel to the soaking temperature T from T<heat preservation> so as to carry out soaking heat preservation.

Description

technical field [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a non-oriented electrical steel plate and a manufacturing method thereof. Background technique [0002] In recent years, in order to reduce the harm of energy consumption to the natural environment, people have made great efforts to use clean energy such as electricity, wind power, and solar energy. Taking the means of transportation used in daily life as an example, all kinds of fuel vehicles are gradually being replaced by hybrid and pure electric electric vehicles. The energy conversion device of these electric vehicles is a drive motor made of non-oriented electrical steel sheet. Moreover, in order to improve the use function of the electric vehicle drive motor, it is developing in the direction of miniaturization, high frequency, and high efficiency. And the control requirements of small anisotropy, the thickness reduction of the finished strip is also on...

AI Technical Summary

Problems solved by technology

[0003] As we all know, after the thickness of the finished strip steel is reduced, the cold rolling reduction rate is large, and after high-temperature continuous annealing, the strip steel is easy to be elongated, and the degree of grain deformation is large, which causes the problem of large anisotropy and affects the driving motor. The effect is very unfavorable

At the same time, under the conditions of higher annealing soaking temperature and longer annealing soaking time, the mechanical strength of the finished strip will decrease, and correspondingly, the magnetic induction intensity will also decrease

In this way, objectively, the increase of the continuous annealing temperature of the finished strip steel and the extension of the annealing soaking time are limited.

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