Process for performing continuous annealing on low-carbon aluminum killed steel belt

Abstract

The invention discloses a process for performing continuous annealing on a low-carbon aluminum killed steel belt. The low-carbon aluminum killed steel belt comprises the following chemical components in percentage by weight: less than or equal to 0.04 percent of C, less than or equal to 0.02 percent of Si, less than or equal to 0.28 percent of Mn, less than or equal to 0.045 percent of Al, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.003 percent of N, and the balance of Fe and inevitable impurities; the low-carbon aluminum killed steel belt is subjected to cold rolling and then is subjected to continuous annealing, and the reduction rate of the cold rolling is controlled to be 70 to 80 percent; the continuous annealing process comprises the following steps of: 1) heating, namely heating from room temperature to 750+ / -10 DEG C at the speed of 150+ / -5 DEG C / s; 2) soaking, namely soaking at the temperature of 750+ / -10 DEG C for 5 to 15s; 3) rapidly cooling, namely cooling to 460+ / -10 DEG C at the speed of 18+ / -2 DGE C / s; 4) soaking, namely soaking at the temperature of 460+ / -10 DEG C for 2 to 5s; 5) slowly cooling, namely cooling to 200+ / -10 DGE C at the speed of 13+ / -2 DEG C / s; and 6) spraying water to cool to room temperature. The mechanical property of a continuous annealing steel plate which is produced by the method is kept almost unchanged, the continuous annealing time is shortened, and the energy consumption is reduced.

Description

Technical field

[0001] The invention belongs to the technical field of heat treatment of metal materials, and specifically relates to a continuous annealing process for low-carbon aluminum killed steel strips. Background technique

[0002] Low-carbon aluminum killed steel is widely used in industries such as automobiles, home appliances, chemicals, and construction because of its excellent stamping performance and beautiful appearance. It is one of the steel grades with higher output and better economic benefits in the metallurgical industry.

[0003] Most domestic steel mills mainly adopt continuous annealing method for heat treatment of low carbon aluminum killed steel strip. Compared with the traditional bell annealing process, the continuous annealing process greatly saves the annealing time and reduces the energy consumption, thereby reducing the production cost and increasing the output.

[0004] For low carbon aluminum killed steel strip, continuous annealing is one of the ke...

Images