Tibet Mag stated that, based on the domestic first silicon steel continuous annealing-coating experimental unit project developed by a steel factory, research and analysis were conducted on the selection of magnesia for coating oriented silicon steel, and the development of oriented silicon steel oxidation Magnesium coating system, and based on this coating system, the magnesium oxide coating process was studied.
The main Research on Magnesium Oxide are as follows:
(1) According to the coating mechanism and the characteristics of magnesium oxide, the selection method of silicon steel grade magnesium oxide is proposed. The action mechanism of magnesium oxide in the production of grain-oriented silicon steel is analyzed, and the characteristic characterization test method of silicon steel grade magnesium oxide is proposed. Through the characterization detection of magnesium oxide and the comparison of microscopic structure differences, the selection basis of silicon steel grade magnesium oxide is proposed .
(2) Developed a magnesia coating system for oriented silicon steel. The factors affecting the coating thickness of magnesia coating were analyzed, and based on this as the design principle of magnesia coating system, a coating system consisting of coating machine, drying and curing furnace, and coiling machine was designed, and the A predictive control method for coating thickness based on soft sensing is presented.
(3) Research on magnesium oxide coating process for grain-oriented silicon steel. The effects of surface cleanliness before annealing and oxide layer formed during annealing on the bottom layer were analyzed. Through experimental research, the configuration of coating liquid, selection of additives, drying and curing temperature, distribution of coiling tension and other processes are determined.
(4) Application and inspection of magnesia coating process on oriented silicon steel. The coating effects of the magnesium oxide coating and the magnesium silicate bottom layer formed after high temperature annealing were tested respectively, and the magnesium silicate bottom layer formed under different coating amounts was compared, and it was verified that the appropriate magnesium oxide coating amount can not only Improve the surface quality, and help the final product to improve magnetic induction and reduce iron loss.