Silicon Chinese name: English name Silicon: siliconsteel defined: very low carbon content and silicon content of 0.5% to 4.5% Fe-Si soft magnetic alloys. Applied science: Materials Science and Technology (a subject); metal materials (two subjects); iron and steel materials (three subjects); iron and steel material varieties (* subject) Introduction A silicone silicon alloy. Rolled silicon steel sheet is the most widely used for electric field of a soft magnetic material, which is also called silicon electrical steel sheet. Silicon steel is widely used in motors, generators, transformers, chokes, electromagnetic mechanism, relays and measuring instrument. Silicon content affect the performance of silicon. Silicon is a good steel deoxidizer. It is combined with oxygen, so that oxygen is converted to carbon reduction is not stable in SiO2, avoid leaving iron-doped by oxygen atom lattice distortion. After the silicon in iron form a solid solution α resistivity surge, while helping the harmful impurities carbon separated. Thus, the general iron containing impurities after adding silicon can improve permeability, reduce the coercive force and iron loss, but increased silicon content will make the hard and brittle materials, thermal conductivity and toughness decrease of thermal and mechanical processing unfavorable , it is generally silicon silicon content does not exceed 4.5%. Carbon, sulfur, oxygen, silicon is considered to be the three evils. These elements will increase the coercive force of the soft magnetic material, and silicon hysteresis loss increases. In addition, too much nitrogen will hinder grain growth, resulting in hysteresis loss and coercive force increases. Aluminum containing excess (more than 0.5%) silicon steel too brittle, difficult to process. It should be the elimination of these impurity elements have an adverse effect on the silicon steel sheet. Cold-rolled grain-oriented silicon steel or silicon steel, also known as Goss texture, first made in 1934 by the NP Goss using cold methods. It has excellent magnetic properties in the rolling direction. Grain-oriented steel texture not only has a high saturation flux density and low iron loss in a strong magnetic field, but also in a weak magnetic field also has good magnetic properties (initial permeability large). This is due to the cold-rolled steel sheet in the process so that lower impurity content, and cause coarse grains in the steel sheet. Coarse grains will increase permeability and reduce hysteresis loss. Cold-rolled steel the grain of the cube edge (the easy magnetization direction) are arranged along the rolling direction, it was in favor of magnetization. This material is known as a single-oriented silicon steel. Now also able to create more easy magnetization direction of silicon (ie non-oriented silicon steel). Motor industrial mass thickness of 0.35 ~ 0.50mm silicon steel sheet; common piece 0.05 ~ 0.20mm thin strip of high-frequency technology in telecommunications in order to more effectively reduce eddy current loss. Hot-rolled silicon steel sheet thickness of 0.35 ~ 0.50mm, density of 7.55 ~ 7.70g / cm, and more for large, medium and small AC and DC motor; cold-rolled non-oriented silicon steel sheet having a thickness of 0.35 ~ 0.50mm, density of 7.65 ~ 7.75 g / cm, and more for large AC generators, motors, large, medium and small AC and DC motor; cold-rolled grain-oriented silicon steel sheet having a thickness of 0.35mm, a density of 7.65g / cm, and more for power transformers, reactors, magnetic amplifiers; cold unidirectional strip thickness 0.05 ~ 0.20mm, high-frequency transformer used for radio.