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Silicon steel sheet of the Company SyriaThe silicon steel sheet is a low carbon ferro-silicon soft magnetic alloy, ships silicon content of 0.5 to 4.5%. Silicon added to improve the resistivity and the maximum magnetic permeability of the iron, reducing the coercive force, core loss (iron loss) and magnetic aging. It is mainly used to produce all kinds of transformers, motors and generators core. World silicon steel production accounted for about 1% of the total steel. Sheet Steel: low iron loss, which is the most important indicator of the quality of the silicon steel. The countries are divided into grades according to the iron loss value, the lower the iron loss, the higher grades. 2. Strong magnetic field of magnetic flux density (magnetic induction) is high, which makes the volume and weight of the motor and transformer core is reduced, saving silicon steel, copper and insulating materials. The surface is smooth, flat and uniform thickness, can increase the fill factor of the core. Punching, more importantly, for the manufacture of micro, small motor. The surface of the insulating film adhesion, and good weldability, corrosion prevention, and to improve the punching resistance. 6. Almost no magnetic aging. Improve silicon steel with silicon content, iron loss, punching and lower magnetic induction, increased hardness. The higher the frequency, the greater the eddy current loss, the optional silicon steel should be more thin. Silicon with oxygen smelting (also available EAF), with the molten steel vacuum treatment and AOD (see refining, molding or casting process to change according to different purposes, smelting silicon (0.5 to 4.5%) and the content of aluminum (0.2% to 0.5%) to meet the requirements of the type of magnetic silicon steel of high grade silicon and the corresponding increase in the amount of aluminum to minimize the carbon, sulfur and inclusions. Cold-rolled silicon steel magnetic surface quality, fill factor, and the punching of better than hot-rolled silicon steel sheet, and into volume production in some countries since the 1960s has stopped the production of hot-rolled silicon steel sheet. China low temperature of about 900 ° C a quick hot and the protection of hydrogen into the manufacture of hot-rolled silicon steel sheet pile annealing method, finished product rate is high, the quality of the finished surface and magnetic properties are better. Cold-rolled non-oriented silicon steel slab or billet hot rolled to a thickness of approximately 2.3mm Tape & Reel. The manufacture of low silicon products, cold-rolled, hot-rolled coil pickling time to 0.5mm thick. The manufacture of high-silicon products, hot-rolled pickling (or by the normalization after pickling 800 to 850 ° C), cold rolled to 0.55 or 0.37mm thick, hydrogen and nitrogen mixed atmosphere of continuous furnace annealed at 850 ℃, and then 0.50 or 0.35mm thick cold-rolled to a small reduction rate by 6 to 10%. This small reduction ratio of cold-rolled annealing allows grain growth, lower iron loss. Both cold rolled sheet in 20% hydrogen and nitrogen mixed atmosphere of continuous furnace to 850 ° C final annealing, and then coated with an insulating film of phosphate chromate. Grain oriented silicon steel with Si3% generally require steel oxide mixed content is low, and must contain C0.03 to 0.05% and inhibitors (the second phase of the dispersion particle or grain boundary segregation elements). Inhibitors prevent the primary recrystallization grain growth and promoting the development of the secondary recrystallization, thereby obtaining a high orientation. The inhibitor itself harmful to the magnetic, so after the completion of inhibition, subject to the purification of the high-temperature annealing. Second phase inhibitor, slab heating temperature must be increased to the original coarse second phase particles solid solution, and then hot-rolled or normalization of fine particle precipitation, in order to enhance the inhibition. Cold-rolled finished thickness of 0.28,0.30 or 0.35mm. Thin cold rolled grain oriented silicon steel strip is 0.30 or 0.35mm thick oriented silicon steel strip, made by pickling, cold rolling and annealing. The countries are divided into grades according to the iron loss value, the lower the iron loss, the higher grades. |