Continuous annealing process of steels exhibiting low yield point retarded of aging properties and good drawability

摘要

In a continuous annealing process for rimmed steels having /=0.06% carbon content, the coiling temperature of said steel while in a strip form, hot and rolling is more than 630 DEG C to form massive carbides in said steel strip then after known coil reducing, is given a rapid cooling rate from a holding temperature during a continuous annealing stage of more than 50 DEG C/sec, subesequent shelf treating temperature of said traveling strip is within the range of 300 DEG C to 500 DEG C for at least 10 seconds, and then said strip is coiled after cooling to room temperature, consequently low yield point of less than about 23kg/mm2, and retarded aging property and good drawability are exhibited.