Non-oriented electrical steel plate with extremely-low iron loss and continuous annealing process of non-oriented electrical steel plate

Abstract

The invention discloses a non-oriented electrical steel plate with the extremely-low iron loss. The non-oriented electrical steel plate is prepared from the chemical elements including, by mass, morethan 0 and less than or equal to 0.005% of C, 1.0%-3.45% of Si, 0.1%-1.2% of Mn, 0.001%-2.0% of Al, 0-0.2% of Cu, 0-0.0015% of Ti, one or both of Sb and Sn with the total content ranging from 0.005% to 0.2%, one or more of Ca, Mg and RE with the total content ranging from 0.0005% to 0.01% and the balance Fe and other inevitable impurities. Besides, the invention discloses a continuous annealing process of the non-oriented electrical steel plate with the extremely-low iron loss. In addition, the invention discloses a manufacturing method of the non-oriented electrical steel plate with the extremely-low iron loss. The method includes the following steps that smelting is performed; casting is performed; hot rolling is performed; normalizing is performed; cold rolling is performed; the continuous annealing process is carried out; and the plate is coated with an insulating coating, so that the non-oriented electrical steel plate with the extremely-low iron loss is obtained.

Description

technical field [0001] The invention relates to a steel plate and its manufacturing process, in particular to a non-oriented electrical steel plate and its continuous annealing method. Background technique [0002] In recent years, high-efficiency EI iron cores, motors, small transformers and other electrical equipment have become more and more popular, and the reason is that these electrical equipment meet the needs of environmental protection, energy saving and effective reduction of carbon dioxide emissions. At the same time, with the continuous improvement of the comprehensive performance of these electrical equipment, correspondingly, the requirements for the non-oriented electrical steel sheet as its raw material are also gradually increased. Specifically, it is expected that the non-oriented electrical steel sheet should have excellent magnetic properties while ensuring the cost advantage, that is to say, the non-oriented electrical steel sheet used to manufacture the...

AI Technical Summary

Problems solved by technology

However, these process steps, especially the normalization or intermediate annealing in the bell furnace, will not only greatly increase the manufacturing cost of the finished steel plate, prolong the production time and delivery cycle of the finished steel plate, but also bring new problems to production management and quality management. greater difficulty

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