Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction

Abstract

The production process of cold rolled non-orientation electric steel plate comprising C not more than 0.0050 wt%, Si not more than 2.50 wt%, Al not more than 1.0 wt%, Si+2Al not more than 2.50 wt%, Mn 0.10-1.50 wt%, P not more than 0.20 wt%, S not more than 0.005 wt%, N not more than 0.0025 wt%, Sn+Sb not more than 0.2 wt%, and Fe and inevitable impurities for the rest includes the following steps: 1. smelting, continuous casting and rolling; 2. normalizing treatment of the hot rolled plate through heating at heating rate of 5-15 deg.c / s to over Ac1, heat soaking at 1100 deg.c below for 10-90 s, cooling in two stages including cooling at the cooling rate belw 15 deg.c / s to below 650 deg.c and cooling at the cooling rate capable of ensuring the plate form to below 80 deg.c; 3. cold rolling; and 4. final annealing to form the cold rolled non-orientation electric steel plate.

Description

technical field

[0001] The invention relates to a cold-rolled non-oriented electrical steel sheet, in particular to a production method of a cold-rolled non-oriented electrical steel sheet with excellent magnetic properties. Background technique

[0002] Cold-rolled non-oriented electrical steel with high magnetic induction and low iron loss is a hot spot in the development of non-oriented electrical steel in recent years. It is developed to meet the requirements of high efficiency and miniaturization for various types of motors and electronic transformer cores in recent years. The loss of the motor mainly includes two parts, one is the iron loss, that is, the core loss, and the other is the copper loss, that is, the loss caused by the wire resistance. For cold-rolled non-oriented electrical steel, iron loss is mainly composed of hysteresis loss and eddy current loss. In general, in order to reduce the eddy current loss, measures such as increasing the content of Si, Al and...

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