Method for manufacturing non-oriented silicon steel plate based on twin-roll thin strip continuous casting technology

Abstract

The invention relates to the technical field of metallurgical technology, in particular to a method for manufacturing a non-oriented silicon steel plate based on a twin-roll thin strip continuous casting technology. The method comprises the steps of: smelting molten steel with the silicon content of 2.9-3.5wt% at a temperature of 1610-1720 DEG C; pouring the molten steel in a tundish, wherein themolten steel flows into a cavity formed by two crystallizing rolls which rotate at a linear velocity of 20-60m / min and a side-closing plate through the tundish, and is in contact with the crystallizing rolls to generate a solidified shell, and a cast band is led out of the crystallizing rolls; obtaining a cast band coil after the cast band is subjected to the online side-shearing treatment and coiling; warm-rolling the cast band coil after the cast band coil is cooled down to 200-600 DEG C in air, wherein the amount of deformation in warm-rolling is 5-30 percent; and cold-rolling, annealing and coating the warm-rolled cast band coil to prepare a non-oriented silicon steel plate. The method provided by the invention has the advantages that the process is simple and compact, energy is saved, consumption is reduced, microscopic structures of the cast band can be effectively controlled, the drawability, the plate shape and the surface quality of the cast band can be improved, and the magnetic induction intensity of the non-oriented silicon steel plate can be effectively increased.

Description

technical field [0001] The invention relates to the field of metallurgy technology, in particular to a method for manufacturing a non-oriented silicon steel plate based on twin-roll strip continuous casting technology. Background technique [0002] Non-oriented silicon steel sheets are mainly used as iron core materials for various motors. In order to reduce the energy loss when the motor is running, it is necessary to further improve the magnetic properties of the non-oriented silicon steel sheet. Among them, the magnetic induction intensity is one of the key indicators of the magnetic properties of the non-oriented silicon steel sheet. Improving the magnetic induction intensity of the non-oriented silicon steel plate can reduce the excitation current of the iron core, reduce the iron loss and copper loss, and save electric energy. When the motor power is constant, increasing the magnetic induction intensity can increase the maximum magnetic induction intensity of the desi...

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Problems solved by technology

Moreover, the cast strip has many crystal defects, poor plasticity and shape, and it is difficult to directly cold-roll it.

The patent of the twin-roll thin strip continuous casting non-oriented silicon steel of Japanese Patent Application Hei 6-31395 discloses a method of applying about 100Kg / mm on the crystallization roll. 2 The method of improving the toughness of the cast strip by pressure, although this method reduces the crystal defects of the cast strip and improves the toughness, but because the temperature of the cast strip just solidified is above 1400°C, the strength is low and the plasticity is poor, and the increase in the casting and rolling force is easy to cause the casting Transverse cracks appear on the strip surface, affecting the subsequent rolling process

Chinese patent 02112304.7 discloses a method for producing non-oriented silicon steel that carries out on-line continuous hot rolling of the cast strip after twin-roll continuous casting. Although the method can improve the toughness of the cast strip and the magnetic properties of the finished plate, the With defects such as flash, edge thickening, and edge cracks, it is very difficult to carry out on-line continuous hot rolling of cast strips, and the shape, thickness, and surface quality of hot-rolled plates are not easy to control

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