Single-phase EI lamination is mainly used in oxygen converter smelting with molten steel vacuum treatment and AOD technology content to meet different magnetic requirements. High-grade single-phase EI laminates have a corresponding increase in silicon and aluminum, with minimal reduction in carbon, sulfur and inclusions. Single-phase EI lamination is mostly cold-rolled because its magnetic properties, surface quality, fill factor, and chipping properties are better than hot-rolled silicon steel sheets.
There is still a difference between ordinary silicon steel sheets and cold-rolled single-phase EI lamination. First, we can distinguish the density. The magnetic saturation point of the cold-rolled single-phase EI laminate is higher than that of the silicon steel sheet. The saturation begins at 1.9 T (19000 Gs); however, the saturation point of the hot rolled silicon steel sheet is about 1.6 T (16000 Gs).
At the same magnetic flux density and frequency, the cold rolled single-phase EI laminate has a lower loss per unit time than the hot-rolled silicon steel sheet. Cold rolled single phase EI laminates are classified into two types: no orientation and orientation. The oriented cold-rolled single-phase EI laminate has the directionality as the name suggests, that is, the magnetic properties along the rolling direction are good, and the saturation magnetic flux density is high.
When the silicon steel sheet is processed by shearing or stamping, the impact on the cold-rolled single-phase EI lamination performance is particularly obvious, and the effect on the hot-rolled silicon steel sheet is small. Therefore, when the small-capacity transformer is cold-rolled single-phase EI lamination Annealing measures can be taken, and the no-load loss is generally reduced by about 8% after annealing.