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Silicon Steel

Silicon steel is an iron alloy which may have from zero to 6.5% silicon (Si:5Fe). Silicon significantly increases the electrical resistivity of the steel, which decreases the induced eddy currents and thus reduces the core loss. Manganese and aluminum can be added up to 0.5%.
Increasing the amount of silicon inhibits eddy currents and narrows the hysteresis loop of the material, thus lowering the core losses. 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.
Source: www.wikipedia.org

Date ASIA EUROPE USA
01/12/2009 2700-4500 1000-1200 2700-2900
01/05/2009 699-835 825-950 825-950
30/10/2008 1070 1080 1060-1090
30/09/2008 1140 1120-1150 1070-1080
30/08/2008 1230 1250-1280 1290-1300
30/07/2008 1210 1270 1300
30/06/2008 1145 1260 1200
30/05/2008 1175 1190-1200 1200-1250
30/04/2008 1140 1200-1350 1300
01/03/2008 985 1000 1025-1050
30/01/2008 922 950-980 960-1000
30/12/2007 885 890-950 900-925




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