Orientation characteristics and key processes of single phase silicon steel lamination

- Apr 30, 2019-

In the process of making single phase silicon steel lamination, its reasonable chemical composition and pure steel quality are the prerequisites for ensuring the electromagnetic properties of silicon steel sheets. The heat treatment process is a key process to improve the electromagnetic properties of silicon steel sheets. The heat treatment equipment of the silicon steel sheet is selected according to the heat treatment step, and the common furnace type has a cover furnace, a continuous furnace, a box furnace and a vacuum furnace.

The silicon steel for electrician in single phase silicon steel lamination is actually an iron-silicon alloy containing 1% to 4.5% Si in industrial pure iron. It has a single phase ferrite structure containing silicon at room temperature. The production process of high-performance silicon steel sheet is: smelting a billet with a given silicon content and a minimum carbon content (actually generally about 0.05% C), and then hot rolling into a steel strip of about 2.5 mm thick, and finally cold rolling is commonly used. A thin steel sheet having a thickness of 0.35 to 0.5 m. Annealing is performed before cold rolling, and carbon is reduced to less than 0.02% in this process; finally, high temperature annealing of the finished product is performed to eliminate work hardening and coarsening of crystal grains. These two types of annealing are the most typical and important heat treatments in the production of silicon steel sheets.

In the single phase silicon steel lamination, if the cold rolling deformation is large (45% to 60%), the textured structure is obtained, and the degree of orientation is about 90%; if the cold rolling deformation is small (<7% to 10%) ), a tissue having a small degree of orientation is obtained. If it is only rolled in the hot state, the silicon steel sheet is not textured, and the performance is the same in the rolling direction and the vertical rolling direction. Therefore, according to the characteristics of the texture orientation, the silicon steel sheets are classified into non-oriented hot-rolled silicon steel sheets, low-degree-oriented cold-rolled silicon steel sheets, and oriented cold-rolled silicon steel sheets.

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