The influence of chemical composition: The fundamental composition of silicon steel consists of three major elements. The first type is fundamental alloying elements such as Si, Al, Mn, etc; The second category includes impurity elements such as C, S, N, O, Ti, Zr, etc; The third category includes trace elements such as Sb and Sn.

The influence of the first type of element

Si, Al, and Mn are useful alloying elements that can reduce the magnetic anisotropy constant K1 and the full hysteresis elastic constant λ s, and are easier to magnetize, resulting in a decrease in pH. In addition, these elements can also add resistivity, so Pe decreases. So adding the content of the first type of element can significantly reduce iron loss. But when these elements are too high, the material becomes hard and brittle, and cannot be cooled.

The influence of the second type of element

C. S, N, O, Ti, Zr and other harmful elements can form small dispersed carbides, sulfides, nitrides and oxides in steel, preventing the growth of annealed grains and magnetic dullness. Therefore, the lower the content of these elements in steel, the better.

The influence of the third type of element

Adding a small amount of Sb and Sn to non oriented silicon steel improves the texture of the non oriented silicon steel sheet after recrystallization annealing, resulting in a significant addition of favorable texture components for (100) and (110), thus significantly reducing (111), reducing iron loss, and improving magnetic induction. Adding a small number of such elements can suppress the composition of internal oxide and nitride layers and improve magnetic function.

grain size

Grain size, small amount of grain boundaries, low resistance to domain wall motion, and reduced hysteresis loss. On the other hand, with larger grain size and larger magnetic domain scale, eddy current losses and abnormal losses increase. So there is a suitable critical grain size to reduce total iron loss.

Impurities, inclusions, and internal stresses

Impurities and impurities in non oriented silicon steel sheets should be minimized as much as possible, which is a more important measure to improve magnetic properties. They not only prevent the movement of domain walls to add hysteresis loss and coercivity, but also make magnetization difficult due to the decrease in surrounding static magnetic energy. They also have a poor impact on particle growth and texture composition. Any internal stress in silicon steel sheets adds coercive force.

Crystal pattern

In oriented silicon steel, progress B8 significantly reduces hysteresis loss. For non oriented silicon steel sheets, the (100) plane pattern has a higher hysteresis loss and P15, followed by the (110) pattern, and the (111) pattern is the worst.

Thickness of steel sheet

Usually, as the thickness of the steel sheet decreases, hysteresis loss increases. But the thickness becomes thinner, and the eddy current loss is significantly reduced. Therefore, there is also a suitable critical thickness for total iron loss. The surface of the steel sheet is smooth and flat, with reduced free magnetic poles, decreased static magnetic energy, decreased wall resistance, and decreased hysteresis loss and coercivity.

Article source: Silicon steel sheet manufacturerhttp://www.cheungshun.com/