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  • TAIXING HONGYE STEEL WIRE MANUFACTURING CO.,LTD

  •  [Jiangsu,China]
  • Business Type:Manufacturer
  • Main Mark: Africa , Asia , East Europe , North Europe , Other Markets , West Europe , Americas , Caribbean , Europe , Middle East , Oceania , Worldwide
  • Exporter:21% - 30%
  • Certs:ISO9001, CE, EMC
TAIXING HONGYE STEEL WIRE MANUFACTURING CO.,LTD

TAIXING HONGYE STEEL WIRE MANUFACTURING CO.,LTD

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Home > Video > Video Display > What is ELECTRICAL STEEL? What does ELECTRICAL STEEL mean? ELECTRICAL STEEL meaning & explanation
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What is ELECTRICAL STEEL? What does ELECTRICAL STEEL mean? ELECTRICAL STEEL meaning & explanation

What is ELECTRICAL STEEL? What does ELECTRICAL STEEL mean? ELECTRICAL STEEL meaning – ELECTRICAL STEEL definition – ELECTRICAL STEEL explanation.Source: Wikipedia.org article, adapted under  license.Electrical steel (lamination steel, silicon electrical steel, silicon steel, relay steel, transformer steel) is a special steel tailored to produce specific magnetic properties: small hysteresis area resulting in low power loss per cycle, low core loss, and high permeability.Electrical steel is usually manufactured in cold-rolled strips less than 2 mm thick. These strips are cut to shape to make laminations which are stacked together to form the laminated cores of transformers, and the stator and rotor of electric motors. Laminations may be cut to their finished shape by a punch and die or, in smaller quantities, may be cut by a laser, or by wire EDM.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%.Silicon significantly increases the electrical resistivity of the steel, which decreases the induced eddy currents and narrows the hysteresis loop of the material, thus lowering the core loss. However, the grain structure hardens and embrittles the metal, which adversely affects the workability of the material, especially when rolling it. When alloying, the concentration levels of carbon, sulfur, oxygen and nitrogen must be kept low, as these elements indicate the presence of carbides, sulfides, oxides and nitrides. These compounds, even in particles as small as one micrometer in diameter, increase hysteresis losses while also decreasing magnetic permeability. The presence of carbon has a more detrimental effect than sulfur or oxygen. Carbon also causes magnetic aging when it slowly leaves the solid solution and precipitates as carbides, thus resulting in an increase in power loss over time. For these reasons, the carbon level is kept to 0.005% or lower. The carbon level can be reduced by annealing the steel in a decarburizing atmosphere, such as hydrogen.Electrical steel made without special processing to control crystal orientation, non-oriented steel, usually has a silicon level of 2 to 3.5% and has similar magnetic properties in all directions, i.e., it is isotropic. Cold-rolled non-grain-oriented steel is often abbreviated to CRNGO.Grain-oriented electrical steel usually has a silicon level of 3% (Si:11Fe). It is processed in such a way that the optimal properties are developed in the rolling direction, due to a tight control (proposed by Norman P. Goss) of the crystal orientation relative to the sheet. The magnetic flux density is increased by 30% in the coil rolling direction, although its magnetic saturation is decreased by 5%. It is used for the cores of power and distribution transformers, cold-rolled grain-oriented steel is often abbreviated to CRGO.CRGO is usually supplied by the producing mills in coil form and has to be cut into “laminations”, which are then used to form a transformer core, which is an integral part of any transformer. Grain-oriented steel is used in large power and distribution transformers and in certain audio output transformers.CRNGO is less expensive than CRGO. It is used when cost is more important than efficiency and for applications where the direction of magnetic flux is not constant, as in electric motors and generators with moving parts. It can be used when there is insufficient space to orient components to take advantage of the directional properties of grain-oriented electrical steel.This material is a metallic glass prepared by pouring molten alloy steel onto a rotating cooled wheel, which cools the metal at a rate of about one megakelvin per second, so fast that crystals do not form. Amorphous steel is limited to foils of about 50 µm thickness. It has poorer mechanical properties and as of 2010 it costs about twice as much as conventional steel, making it cost-effective only for some distribution-type transformers. Transformers with amorphous steel cores can have core losses of one-third that of conventional electrical steels.
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