Hot rolling heating method capable of improving head and tail performance of non-oriented silicon steel

Abstract

The invention provides a hot rolling heating method capable of improving the head and tail performance of non-oriented silicon steel. In the method, a billet to be heated for hot rolling is of a fixed size, a stepwise heating furnace is used for heating, and the opening rate of a burner on the inner side of the heating furnace and burners which are less than one meter away from the head and tail parts of the billet are controlled to be 50 to 90 percent. In the invention, the thickness of the billet is 150 to 300 millimeters, the charging temperature of the billet is above 400 DEG C, the heating time is 120 to 280 DEG C, the heating temperature is 1,200 to 1,400 DEG C, and the discharging temperature is 1,100 to 1,240 DEG C. In the invention, the opening rate of the burners in the heating furnace is controlled to reduce the temperatures of the heating furnace close to the head and tail parts of the billet, and thus, the radiant heat exchange between the furnace body and the head and tail parts of the billet is reduced. When the technical scheme of the invention is adopted, the fluctuation in the electromagnetic performance of the cold-rolled non-oriented silicon steel product can be reduced effectively by using the conventional equipment without influencing output and the performance of other products produced in the same furnace; and therefore, the head and tail performance of the cold-rolled non-oriented silicon steel product is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical products, in particular to a hot-rolling heating method for cold-rolling non-oriented silicon steel. Background technique [0002] Cold-rolled non-oriented silicon steel is a magnetic material, and iron loss is the most important index to measure its performance. When the chemical composition is constant, the grain size of the finished product plays a decisive role in the iron loss performance. Therefore, in the production of non-oriented silicon steel, it is hoped that the grain size of the finished product is as large as possible. Precipitates in steel have a greater impact on grain growth. Production studies have found that fine precipitated nitrides have the greatest impact on grain size, while coarse nitrides have less impact on grain size. When the composition of the steel is determined, the control of the process parameters of the hot rolling process can change the pre...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high iron loss at the head and tail of the finished steel coil due to the uneven heating temperature of the cold-rolled non-oriented silicon steel hot-rolled billet in the prior art, and provide a method that can reduce the performance fluctuation of the finished iron loss and improve the non-oriented Hot Rolling Heating Method for Head and Tail Properties of Silicon Steel

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