The manufacturing technology and product quality of three phase Ei electrical steel laminations is one of the important indicators to measure the level of special steel production and technology development in a country. The three phase Ei electrical steel laminations is divided into cold rolling and hot rolling. The hot-rolled three phase Ei electrical steel laminations is melted by a flat furnace or an electric furnace, and is repeatedly hot rolled into a thin plate, and finally annealed at 800-850 ° C. production. However, its availability is low and energy consumption is high. In recent years, relevant departments have forced the elimination.
The most important use of cold-rolled non-oriented three phase Ei electrical steel laminations is for generator manufacturing, which contains 0.5%-3.0% silicon. After cold rolling to finished thickness, its Bs is higher than oriented silicon steel; and hot rolled silicon steel In comparison, the thickness is uniform, the dimensional accuracy is high, and the surface is smooth and flat, thereby improving the filling factor and the magnetic properties of the material.
The most important use of cold-rolled oriented three phase Ei electrical steel laminations is for transformer manufacturing. The magnetic properties of oriented silicon steels have strong directionality; they have superior high magnetic permeability and low loss characteristics in the easy magnetization rolling direction. The iron loss of the oriented steel strip in the rolling direction is only 1/3 of the transverse direction, the ratio of magnetic permeability is 6:1, the iron loss is about 1/2 of the hot rolled strip, and the magnetic permeability is 2.5 times that of the latter. .
High magnetic induction cold-rolled three phase Ei electrical steel laminations are single-oriented steel strips, mainly used in the manufacture of various transformers, chokes and other electromagnetic components in the telecommunications and instrumentation industries. There are two main features in its application. First, under the condition of low current or weak magnetic field, the material is required to have high magnetic properties in the weak magnetic field, ie high μ0 value and high B value; the second characteristic is the frequency of use. High, usually above 400Hz, even up to 2MHz.