Silicon steel is divided into oriented silicon steel, non-oriented silicon steel these two categories. The magnetic properties of oriented silicon steel are strongly directional, with the lowest iron loss and the highest magnetic permeability in the rolling direction and high magnetic inductance in a certain magnetizing field. The silicon content of oriented silicon steel is about 3%, and requires that the oxide inclusion content in the steel is low, and must contain a certain inhibitor (MnS, A1N), because it is used for transformer core manufacturing, so it is also called cold-rolled transformer steel.