High-aluminum thin electrical steel and producing method thereof

Abstract

The invention provides high-aluminum thin electrical steel and a producing method thereof. The steel comprises following chemical components by weight: not more than 0.0030% of C, 1.5-2.0% of Si, 0.10-0.30% of Mn, not more than 0.008% of P, not more than 0.0020% of S, not more than 0.0025% of N, 1.5-2.0% of Als, not more than 0.001% of Ti, not more than 0.0020% of Nb and not more than 0.0020% of V, with the balance being Fe and other unavoidable residual elements. The producing method includes smelting, continuous casting, hot rolling, normalizing, cold rolling and annealing. By high-aluminum alloying, the sensitivity of the steel in hot conditions is reduced and lattice deformation is relieved, thus facilitating stability of the product producing process. The Al element increases the specific resistance, allows the (100) component to be increased and the (111) component to be reduced, reduces the iron loss and achieves high silicon effects. The plate shape is controlled by rolling with heat and a secondary cold rolling method. The electrical steel and the producing method are suitable for producing cold-rolled non-oriented silicon steel thin strips having a thickness of 0.2-0.3 mm, and meet the technical requirements of frequency conversion.

Description

technical field [0001] The invention belongs to the technical field of production of electrical steel products, in particular to a production method of high-aluminum thin-gauge cold-rolled non-oriented silicon steel. Background technique [0002] With the wide application of frequency conversion energy-saving technology, in order to save energy and protect the environment, it is required to make the motor more efficient and miniaturized. Under the control of the motor, the speed of the motor increases from thousands of revolutions per minute to tens of thousands of revolutions per minute. The higher the frequency, the more serious the iron loss of the non-oriented silicon steel core increases. Increasing the resistivity and reducing the strip thickness are effective means to reduce iron loss. , as the silicon content increases, the resistivity and magnetic permeability increase, and the iron loss decreases, but when the silicon content reaches 3.3%, the cold workability of t...

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Problems solved by technology

[0002] With the wide application of frequency conversion energy-saving technology, in order to save energy and protect the environment, it is required to make the motor more efficient and miniaturized. Under the control of the motor, the speed of the motor increases from thousands of revolutions per minute to tens of thousands of revolutions per minute. The higher the frequency, the more serious the iron loss of the non-oriented silicon steel core increases. Increasing the resistivity and reducing the strip thickness are effective means to reduce iron loss. , as the silicon content increases, the resistivity and magnetic permeability increase, and the iron loss decreases, but when the silicon content reaches 3.3%, the cold workability of the steel grade drops sharply; as the product thickness decreases, edge cracks and Frequent belt breaks, the shape and surface quality are difficult to control

[0003] Among the existing non-oriented silicon steel thin strip production technologies, several related patents such as the publication number CN101269384A "A Method for Manufacturing Cold-Rolled Non-oriented Silicon Steel Strip" were found, mainly involving high silicon content and smelting control; In addition, the publication No. CN1326009A "Excellent Machinability and Low Iron Loss Non-Oriented Electrical Steel Sheet and Its Preparation Method" mentions the alloy range 0.1≤Mn≤1.5, 0.1≤Si≤4, 0.1≤Al≤4, Mn+ Si+Al≤5.0, also adding one, two or three combinations of REM, Ca, Mg, although the range of Al content is wide, no mention of high Al thin strip production technology

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