When a steel core is magnetized and then demagnetized, it absorbs energy (and heats up). Then a loss of power is happened. Electrical steels are designed to reduce this power loss. Electrical steels are also designed to have a high permeability. This means that the electrical current needed to produce the magnetism should be as low as possible.
Electrical steel, also called lamination steel, silicon electrical steel, silicon steel, relay steel or transformer steel, is specialty steel tailored to produce certain magnetic properties, such as a small hysteresis area and high permeability.Electrical steel is an iron alloy which may have from zero to 6.5% silicon (Si: 5Fe). Commercial alloys usually have silicon content up to 3.2% (higher concentrations usually provoke brittleness during cold rolling). Manganese and aluminum can be added up to 0.5%
The material is usually manufactured in the form of cold-rolled strips less than 2 mm thick. These strips are called laminations when stacked together to form a core. Electrical Steels are normally supplied in coils. Coils can be ordered slit to a width used most economically by the fabricator. Many fabricators have their own slitting or shearing equipment where volume warrants. This reduces the amount and variety of stock that must be carried in inventory.
PRODUCT DESCRIPTION
Magnetic cores for the wide range of modern electrical and electronic devices require magnetic materials with many combinations of properties and characteristics. Of all the soft magnetic core materials, the most widely used are known as electrical steels.
| Silicon Steel General Types | Grade AISI Designation |
| Non Oriented | |
| M-15 | |
| M-19 | |
| M-22 | |
| M-27 | |
| M-36 | |
| M-43 | |
| M-45 | |
| M-47 | |
| Oriented | |
| M-2 | |
| M-3 | |
| M-4 | |
| M-6 |
CRGO Electrical Steel
Properties of Electrical steel
The hysteresis loss is low i.e. The magnetic domains get easily aligned in one or the other directions and not much of electrical energy is required for this process.(hysteresis graph on following slides)
The magnetic permeability is high i.e. the material easily allows formation and accumulation of magnetic field within.
Electrical resistance is high to prevent eddy current losses.(current that flows on the surface as a result of electromagnetic induction over the core coil)
Raw Material for Electrical Steel:
Ferro silicon alloy (15-90% Si) is the base material.
The alloy is processed to lower the silicon content {3.5%} and remove constituents like Mn, S etc.
Finally the density becomes around (7600+-50) kg/m3
