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The difference between oriented silicon steel and non-oriented silicon steel

26 Sep 2023
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The difference between oriented silicon steel and non-oriented silicon steel
01  Different properties
Grain-oriented silicon steel: Grain-oriented silicon steel, also known as cold-rolled transformer steel, is an important ferrosilicon alloy used in the transformer (core) manufacturing industry.
Non-oriented silicon steel: Non-oriented silicon steel is a ferrosilicon alloy with very low carbon content. Its grains are randomly oriented in the deformed and annealed steel plate.
02  Different characteristics
Grain-oriented silicon steel: The magnetism of grain-oriented silicon steel has strong directionality, with the lowest iron loss value in the rolling direction, the highest magnetic permeability and high magnetic induction value under a certain magnetizing field. The silicon content of oriented silicon steel is about 3%, and the steel is required to have low oxide inclusion content and must contain some kind of inhibitor (MnS, A1N).
Non-oriented silicon steel: Non-oriented silicon steel is a ferrosilicon alloy containing 0.8%-4.8% silicon. It is hot and cold rolled into silicon steel sheets with a thickness of less than 1mm. Adding silicon can increase the resistivity and maximum magnetic permeability of iron, and reduce coercive force, core loss (iron loss) and magnetic aging.
                                                                                      
03   Different production processes
Grain-oriented silicon steel: Grain-oriented silicon steel is smelted in an oxygen converter. The billet undergoes hot rolling, normalization, cold rolling, intermediate annealing and secondary cold rolling to the finished thickness, and then undergoes decarburization annealing and high-temperature annealing, and is finally coated with an insulating layer.
Non-oriented silicon steel: pre-desulfurization of molten iron, secondary desulfurization by adding Ca0+CaF: flux or rare earth elements and calcium during converter blowing. The boiling molten steel is decarburized by vacuum treatment and then further desulfurized. Ferrosilicon with low titanium and zirconium content is selected for alloying.
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