How much is an old silicon steel sheet for a transformer?
Cold rolled silicon steel sheet or grain oriented silicon steel sheet, also known as Goss texture steel sheet, was first made by cold rolling method of N.P. Goss in 1934. It has fine magnetic properties along the rolling direction. The grain oriented textured steel sheet not only has high saturation magnetic flux density and low iron loss in the strong magnetic field, but also has good magnetism in the weak magnetic field (large initial permeability). This is because the cold rolling process reduces the impurity content in the steel sheet and causes the coarse grain in the steel sheet. The coarse grain assembly increases permeability and reduces hysteresis loss. The cold rolled steel sheet makes the cubic edge of the grain (the most easily magnetized direction) arranged along the rolling direction, which is beneficial to the magnetization. This material is called a single oriented silicon steel sheet. It is also possible to manufacture a silicon steel sheet with multi directions and easy magnetization (i.e., non oriented silicon steel sheet).
The lattice distortion of iron is avoided by the doping of oxygen atoms. Silicon becomes a solid solution in alpha iron, increasing resistivity and helping to separate harmful impurities from carbon. Therefore, the iron containing impurities into silicon can increase the permeability, reduce the coercivity and losses, but with the increase of silicon content and make the material brittle and hard, decreased thermal conductivity and toughness against thermal and mechanical processing, the general silicon steel sheet of silicon containing no more than 4.5%.
Ferrosilicon alloy. The sheet material rolled with silicon steel is the most widely used soft magnetic material in the field of electrical engineering. Therefore, silicon steel sheet is also called electrical steel sheet. Silicon steel sheets are widely used in motors, generators, transformers, chokes, electromagnetic devices, relays and measuring instruments.
Silicon steel is a kind of ferrosilicon alloy. The sheet material rolled with silicon steel is the most widely used soft magnetic material in the field of electrical engineering. Therefore, silicon steel sheet is also called electrical steel sheet. Silicon steel sheets are widely used in motors, generators, transformers, chokes, electromagnetic devices, relays and measuring instruments.
