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A method for improving the magnetic anisotropy of high-grade non-oriented silicon steel
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A technology of magnetic anisotropy and oriented silicon steel, which is applied in the field of iron and steel metallurgy, can solve the problems of insignificant effect and unsuitable large-scale production process of conventional equipment, etc., to increase the growth time, improve magnetic anisotropy, and homogenize grains Effect
Active Publication Date: 2021-10-22
ANGANG STEEL CO LTD
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[0005] "A Production Method for Improving the Electromagnetic Anisotropy of Electrical Steel Products" (CN201610562185.4), mainly achieves the purpose of improving the magnetic anisotropy by controlling the strip elongation and heating rate during annealing; but it is mainly for medium and high grades Non-oriented silicon steel is effective for silicon, but the effect is not obvious for non-oriented silicon steel with a silicon content greater than 2.90%
[0006] Northeastern University published "A Preparation Method for Thin Strip Continuous Casting Low Magnetic Anisotropy Non-Oriented Silicon Steel" (CN201810081918.1), which mainly adopts thin strip continuous casting technology, controls hot rolling reduction rate and other processes, and adds Sn and other elements at the same time , to achieve the purpose of producing non-oriented silicon steel with low magnetic anisotropy; this invention is suitable for non-oriented silicon steel with silicon content less than 2.0%, adopts thin strip continuous casting technology, advanced technology but not suitable for large-scale production process of conventional equipment
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Embodiment 1
[0029] A method for improving the magnetic anisotropy of high-grade non-oriented silicon steel. The process includes: smelting, hot rolling, normalization, cold rolling, and annealing; wherein:
[0030] Chemical composition: C: 0.0022%, Si: 3.01%, Mn: 0.45%, P: 0.009%, S: 0.0011%, Als: 0.68%, N: 0.0021%; the rest is iron and unavoidable impurity elements.
[0031] Main control process:
[0032] 1. See Table 1 for the hot rolling process;
[0033] Table 1:
[0034]
[0035] 2. Annealing process
[0036] The strip tension in the annealing furnace is 2.5KN, the strip speed is 70m / min, and the annealing temperature is 930°C.
Embodiment 2
[0038] A method for improving the magnetic anisotropy of high-grade non-oriented silicon steel. The process includes: smelting, hot rolling, normalization, cold rolling, and annealing; wherein:
[0039] Chemical composition: C: 0.0025%, Si: 2.95%, Mn: 0.48%, P: 0.009%, S: 0.0017%, Als: 0.72%, N: 0.0023%; the rest is iron and unavoidable impurity elements.
[0040] Main control process:
[0041] 1. See Table 2 for the hot rolling process;
[0042] Table 2:
[0043]
[0044] 2. Annealing process
[0045] The strip tension in the annealing furnace is 2.9KN, the strip speed is 75m / min, and the annealing temperature is 920°C.
Embodiment 3
[0047] A method for improving the magnetic anisotropy of high-grade non-oriented silicon steel, comprising:
[0048] Chemical composition: C: 0.0024%, Si: 3.10%, Mn: 0.54%, P: 0.010%, S: 0.0015%, Als: 0.70%, N: 0.0020%; the rest is iron and unavoidable impurity elements.
[0049] Main control process:
[0050] 1. See Table 3 for the hot rolling process;
[0051] table 3:
[0052]
[0053] 2. Annealing process
[0054] The strip tension in the annealing furnace is 3.2KN, the strip speed is 68m / min, and the annealing temperature is 935°C.
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Abstract
The invention relates to a method for improving the magnetic anisotropy of high-grade non-oriented silicon steel. The rough hot rolling adopts the 1+3 rolling method, the temperature of the R1 rolling mill is controlled at 1080-1120°C, and the temperature of the first pass of the R2 rolling mill is controlled at 1060°C. ~1100°C, the temperature of the second pass of the R2 rolling mill is controlled at 1030~1070°C, the temperature of the third pass of the R2 rolling mill is controlled at 1000~1040°C; the reduction rate of the R1 rolling mill is 20~25%, and the first pass of the R2 rolling mill is reduced The reduction rate of the second pass of the R2 rolling mill is 35-40%, and the reduction rate of the third pass of the R2 rolling mill is 45-50%. The strip steel tension in the annealing furnace is 2-5KN, and the strip speed is 65-5KN. 75m / min, annealing temperature 900~950℃. The invention obtains specific crystal structure and texture components, shortens the on-line time from steel billet exiting the heating furnace to finishing rolling, reduces temperature drop, reduces deformation resistance of finishing rolling, and reduces production accidents such as steel jamming.
Description
technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for improving the magnetic anisotropy of high-grade non-oriented silicon steel. Background technique [0002] High-grade electrical steel products are widely used in the manufacture of high-end, precision, and sharp-point motors and iron cores for instruments and meters, as well as in the field of large-scale generators. The motor works in the running state, and it is required that the difference in the magnetic and isotropic properties of the electrical steel plate should not be too large. In particular, high-grade and high-brand products are often used in the field of large motors, which have stricter requirements on the anisotropy of electrical steel. [0003] In the production process of high-grade electrical steel products, with the increase of Si content, the columnar grains are coarse and the proportion increases, intergranular segregation of residual ele...
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