Preparation method of thin-gauge non-oriented silicon steel with high magnetic induction and low iron loss based on thin strip continuous casting

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of high-magnetic-induction and low-iron-loss thin-gauge non-oriented silicon steel on the basis of thin-strip continuous casting. Molten steel is prepared from, by mass, smaller than or equal to 0.005% of C, 2.6%-3.2% of Si, 0.005%-0.3% of Mn, 0.1%-0.5% of Al, 0.005%-0.05% of P, smaller than or equal to 0.003% of S, smaller than or equal to 0.003% of N, smaller than or equal to 0.003% of O and the balance Fe and unavoidable impurities, and the thickness of the non-oriented silicon steel ranges from 0.10 mm to 0.20 mm. The preparation method of the non-oriented silicon steel comprises the steps of smelting, thin-strip continuous casting, acid pickling, warm rolling, two-stage cold rolling, finished product annealing and coating treatment. According to the preparation method of the high-magnetic-induction and low-iron-loss thin-gauge non-oriented silicon steel on the basis of thin-strip continuous casting, on the basis of a double-roller thin-strip continuous casting, a conventional cast blank reheating and hot rolling process is eliminated, beneficial {100} and {110}<001> texture in annealed plates is improved by controlling the columnar crystal proportion in cast strips and warm-rolled and cold-rolled reduction, the plate shape and texture uniformity are improved, and the magnetic property is improved. The preparation method is short in technological process and low in energy consumption, and the product is high in magnetic induction and low in iron loss.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing non-oriented silicon steel with high magnetic induction and low iron loss and thin specifications based on thin strip continuous casting. Background technique [0002] Non-oriented silicon steel is an important iron core material for motors and engines. With the development of frequency conversion technology, people put forward higher performance requirements for non-oriented silicon steel sheets. For traction motors, the internal non-oriented silicon steel not only requires low iron loss (especially low iron loss at high frequency) to improve motor efficiency, but also requires high magnetic induction to enhance torque. At high frequencies, eddy current loss accounts for the main part of iron loss, and its value is proportional to the square of the material thickness. Therefore, the most effective way to reduce the loss of silicon steel is...

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Problems solved by technology

At present, there are few research reports on the production of non-oriented silicon steel strips by continuous casting of thin strips. Only CN104451372 and CN103060701 report a production method of high-silicon non-oriented silicon steel sheets. In view of the poor processability of high-silicon steels, its industrial production will will be hindered

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