EI silicon steel composite steel plate is a kind of ferrosilicon soft magnetic alloy with very low carbon content. Generally, the silicon content is 0.5-4.5%. The addition of silicon can increase the electrical resistivity and maximum magnetic permeability of iron. It is mainly used to make various transformers. The core of the motor and generator. The EI silicon steel composite steel plate comprises an E-type silicon steel sheet and a type I silicon steel sheet. The outer short side length of the E-type silicon steel sheet is larger than the inner short side, and one side of the I-type silicon steel sheet is provided with a convex step and on the surface of the body. The insulating layer and the anti-corrosion layer are sequentially coated.
When the EI silicon steel composite steel plate is heated, the thin steel plate is put into the sealing heating furnace; then the ammonia furnace gas is injected into the heating furnace; the temperature in the furnace is heated, first heated to 640-655 ° C, and kept for 3 to 5 hours. After that, stop heating for 3 to 5 hours to cool down naturally. After heating for another 30 to 45 minutes, stop heating for 2 to 4 hours, and then warm for 10 to 20 minutes. Maintain in the furnace until the cumulative heating and cooling time is 45~ 60 hours.
The advantage of EI silicon steel composite steel plate is that the gap is easy to control, the assembly process is simple, and the efficiency is high. At the same time, the surface of each silicon steel sheet is coated with an insulating layer and an anti-corrosion layer, thereby improving the insulation and anti-corrosion of the silicon steel sheet; and the silicon steel sheet adopts an improved heating method, which has the advantages of simple process, energy saving and low cost.