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Synopsis: 1) The solubility product of AIN in austenite is several times as Large as that in ferrite. It is, therefore, necessary to make uniform distribution of austenite phase in a steel to secure uniform distribution of precipitated AIN in the ferrite matrix. The microstructure of a thin plate casting of 3% silicon steel is very fine and the distribution of austenite phase is rather uniform compared with the hot rolled plate of the same steel. On the basis of the above findings, an unique manufacturing process of grain oriented silicon steel is proposed, which makes it possible to eliminate conventional high-temperature slab reheating. By direct casting of thin plate, the uniform distribution of AIN precipitates can be secured. 2) The precipitation of MnS below the Curie temperature is observed to be smaller in quantity than that expected from an extrapolation of the precipitation in the higher temperature range. 3) The unique manufacturing process proposed here can greatly save energy consumption comparing with the conventional process.

Study of the Method of Controlling the Precipitation Behaviour of MnS and AlN in Unique Manufacturing Process of Grain Oriented 3% Silicon Steel