Patent ID: 6582537
Filing Date: 2003-06-24
Classification: C21D

Abstract:
A method for producing cold-rolled strips or sheets out of a low-alloyed steel containing a respective max. 0.2% of C, Al, Ti, V Nb, and a respective max. 1% Si and Mn, and optionally a quantity of boron (>0.78Ã—N) required for N-setting, remainder iron and unavoidable impurities, comprising:melting the low-alloyed steel; casting the low alloyed steel into slabs, thin slabs or strips; hot-rolling the slabs, thin slabs or strips at an initial temperature exceeding 1,100Â° C. and at a final temperature lying under Ar3 to obtain a hot strip; coiling the hot strip at a temperature of less than 650Â° C.; cold rolling the hot strip at a total cold rolling degree of at most 50% to produce a cold-rolled strip; and annealing the cold strip for a time sufficient for complete recrystallization at a temperature ranging from 520 to 780Â° C.