Cooling speed control method after hot rolling for manufacturing cold-rolled steel sheet excellent in durability

摘要

The present invention relates to a cold-rolled steel sheet produced by continuous annealing using aluminum killed steel as a raw material, in which solid nitrogen is almost completely precipitated as AIN to prevent deterioration of mechanical properties due to aging after aging, It is an object of the present invention to provide a method of controlling the cooling rate after hot rolling for manufacturing.;The present invention relates to a method for producing a cold-rolled steel sheet in which hot-rolled, hot-rolled and cooled aluminum-killed steel are subjected to cold rolling and continuous annealing, wherein hot rolling is performed at a temperature of 50-730C, And after cooling is carried out at a cooling rate of 0.5-2 DEG C / min. The present invention relates to a cooling rate control method after hot rolling for producing cold-rolled steel sheets excellent in anti-aging properties.