Energy-saving and high-production-efficiency method for preparing common grain-oriented silicon steel

Abstract

The invention discloses an energy-saving and high-production-efficiency method for preparing common grain-oriented silicon steel. The process comprises the following steps of: smelting and continuously casting, hot-rolling, normalizing and acid-washing, performing primary cold rolling, decarbonizing and annealing, performing secondary cold rolling, performing secondary recrystallization annealing, coating Mgo, performing high-temperature purification annealing, and performing flat annealing and coating an insulation film. On the premise of low-temperature heating of grain-oriented silicon steel casting blank, decarbonizing and annealing is performed between two times of cold rolling, an intermediate annealing process is eliminated, the high-temperature annealing of the grain-oriented silicon steel is divided into secondary recrystallization annealing and high-temperature purification annealing which are implemented separately, and the aims of saving energy and reducing consumption, and improving production rhythm and efficiency can be fulfilled.

Description

technical field [0001] The invention relates to a production method of ordinary oriented silicon steel, in particular to an energy-saving and high production efficiency ordinary oriented silicon steel manufacturing method. Background technique [0002] Grain-oriented silicon steel is known as a "handicraft" in steel products because of its narrow process window and complicated preparation process. It is an important soft magnetic alloy used in the electric power and electronics industries. [0003] The production process route of ordinary oriented silicon steel is: smelting and continuous casting → high temperature heating and hot rolling → primary cold rolling → intermediate annealing → secondary cold rolling → decarburization annealing → MgO coating → high temperature annealing → smooth annealing and coating insulating film . [0004] With the increasingly tense energy supply and the requirements of environmental protection and low-carbon economic development, the shortco...

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Problems solved by technology

Bell furnace or ring furnace is used for high temperature annealing, and the secondary recrystallization is completed by slowly raising the temperature of the oriented silicon steel coil above 600°C (the heating rate is generally 15-25°C / h), and the heating time is 30-40h; In order to purify steel (that is, steel desulfurization), it is necessary to keep warm for a long time (10-40h) in the high temperature section (1180-1210°C). a bottleneck of

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