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Method for preparing non-oriented silicon steel with high magnetic induction
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A technology of oriented silicon steel and a manufacturing method, which is applied in the direction of metal rolling, inorganic material magnetism, etc., can solve the problems of large hysteresis loss, long holding time and high soaking temperature
Active Publication Date: 2012-05-16
BAOSHAN IRON & STEEL CO LTD
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If the soaking temperature is high, the holding time is long, and the grains of the annealed plate are coarse, the {111} plane texture in the material will be enhanced, resulting in a decrease in magnetic induction; but if the grain diameter is too small, the hysteresis loss of the material will be too large, Increased motor losses in end use
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Embodiment 1
[0036] (1) Non-oriented silicon steel hot-rolled sheet, thickness 2.6mm, composition: Si 0.799%, Al 0.4282%, C 0.0016%, Mn 0.26%, P≤0.022%, S≤0.0033%, N≤0.0007%, Nb 0.0004 %, V 0.0016%, Ti 0.0009%; the rest are iron and unavoidable impurities.
[0037] (2) Cold rolling is performed on the hot-rolled sheet, and the reduction rate is 1-10%.
[0038] (3) Carry out normalization treatment, the normalization soaking temperature is 970°C, and the temperature is kept for 60s. After that, the normalized plate was pickled and then cold rolled to a thickness of 0.5 mm.
[0039] (4) Rapid heating annealing is carried out by using an electric heating annealing furnace in the laboratory. The heating rate is 250°C / s, the soaking temperature is 850°C, and the heat preservation time is 13s.
[0040]After the hot-rolled sheet is lightly reduced by 1-10%, the recrystallized structure of the normalized sheet becomes larger obviously, but the microstructure of the finished sheet has little dif...
Embodiment 2
[0047] (1) Non-oriented silicon steel hot-rolled sheet, thickness 2.6mm, composition: Si 1%, Al 0.2989%, C 0.0015%, Mn 0.297%, P 0.0572%, S 0.0027%, N 0.0009%, Nb 0.0005%, V 0.0015%, Ti 0.0011%; the rest is iron and unavoidable impurities.
[0048] (2) The hot-rolled sheet is cold-rolled at a reduction rate of 4%.
[0049] (3) Perform normalization treatment, the normalization soaking temperature is 950°C, and the temperature is kept for 60s. After that, the normalized plate was pickled and then cold rolled to a thickness of 0.5 mm.
[0050] (4) Use the electric heating annealing furnace in the laboratory to perform rapid heating annealing at different heating rates. The heating rate is 20°C / s, 150°C / s, 250°C / s, the soaking temperature is 960°C, and the heat preservation time is 13s.
[0051] The properties of the final annealed sheet are shown in Table 3.
[0052] Table 3. Magnetic properties of final annealed sheet of non-oriented silicon steel
[0053]
[0054] It c...
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Abstract
The invention provides a method for preparing a non-oriented silicon steel with high magnetic induction, which comprises the following steps: 1) smelting and casting, wherein the non-oriented silicon steel comprises the following chemical components by weight percentage: 0.1-1% of Si, 0.005-1% of Al, less than or equal to 0.004% of C, 0.10-1.50% of Mn, less than or equal to 0.2% of P, less than or equal to 0.005% of S, less than or equal to 0.002% of N, less than or equal to 0.006% of Nb+V+Ti and the balance of Fe, steel-making, secondary refining and casting to casting blank; 2) hot rolling,wherein the heating temperature is 1150 DEG C-1200 DEG C, the finishing temperature is 830-900 DEG C, reeling at the temperature of greater than or equal to 570 DEG C; 3) flattening, cold rolling with reduction ratio of 2-5%; 4) normalizing, wherein the temperature is not less than 950 DEG C, insulating for 30-180s; 5) pickling and cold rolling, wherein the cold rolling with accumulated reductionratio of 70-80% is carried out after pickling; 6) annealing, heating to the temperature of 800-1000 DEG C with speed of greater than or equal to 100 DEG C, insulating for 5s-60s, slow cooling to the temperature of 600-750 DEG C with speed of 3-15 DEG C / s. Under the prerequisite that the iron loss is ensured, at least 200 gauss of the non-oriented silicon steel magnetic induction can be increased.
Description
technical field [0001] The invention relates to a method for manufacturing non-oriented silicon steel, in particular to a method for manufacturing high magnetic induction non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel is an important magnetic material widely used in various motors, compressors and other fields. Generally, the silicon content is less than 6.5%, the aluminum content is less than 3%, the C% is less than 0.1%, and it contains less impurity elements. Then implement hot rolling, normalization and cold rolling processes, and carry out final annealing and coating insulation layer. [0003] For non-oriented silicon steel, the performance indicators mainly include material iron loss, magnetic induction and magnetic anisotropy. The magnetic properties of non-oriented silicon steel are affected by many factors such as material composition, thickness, and heat treatment process. [0004] In order to obtain ultra-high magnetic indu...
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