Silicon is a good deoxidizer for steel. It combines with oxygen to convert oxygen into stable SiO2 that is not reduced by carbon, avoiding the lattice distortion of iron due to oxygen atom doping. Silicon becomes a solid solution in -iron, which increases the resistivity and helps separate harmful impurities, carbon. Therefore, generally, adding silicon to iron containing impurities can increase the magnetic permeability, reduce coercive force and iron loss. However, increasing the silicon content will make the material hard and brittle, and the thermal conductivity and toughness will decrease, which is detrimental to heat dissipation and mechanical processing. Therefore, the silicon content of silicon steel sheets generally does not exceed 4.5%.

According to the manufacturing process and application, electrical steel is divided into three categories: hot-rolled silicon steel, cold-rolled electrical steel and special-purpose silicon steel.

1.Iron loss value

2. Magnetic flux density

Magnetic flux density is another important electromagnetic property of silicon steel sheets, which indicates the ease with which silicon steel sheets are magnetized. Under the magnetic field intensity of a certain frequency, the magnetic flux passing through unit area is called magnetic flux density. Usually the magnetic flux density of silicon steel sheets is measured at a frequency of 50 or 60 Hz and an external magnetic field of 5000A/m. It is called B50, and its unit is Tesla.

3.Hardness

Hardness is one of the quality characteristics of silicon steel sheets. When modern automatic punching machines are punching sheets, the requirements for hardness are more stringent. When the hardness is too low, it is not conducive to the feeding operation of the automatic punching machine. At the same time, it is easy to produce excessively long burrs and increase assembly time. time difficulties. In order to meet the above requirements, the hardness of the silicon steel sheet must be higher than a certain hardness value. For example, the hardness of 50AI300 silicon steel sheet is usually no less than HR30T hardness value 47. The hardness of silicon steel sheets increases as the grade increases. Generally, the more silicon content is added to high-grade silicon steel sheets, the effect of solid solution strengthening of the alloy makes the hardness higher.

4. Flatness

5. Thickness uniformity

6.Coating film

7. Film processing properties