Cold-rolled steel sheets and a method of manufacturing the same

Details Cold-rolled steel sheets and a method of manufacturing the same Cold-rolled steel sheets and a method of manufacturing the same

C - Chemistry, Metallurgy

22

C

148/10, 75/146

C22C 38/12 (2006.01) C21D 8/02 (2006.01) C21D 8/04 (2006.01) C22C 38/14 (2006.01)

Patent

CA 1259827

59-146,990 comb. COLD-ROLLED STEEL SHEETS AND A METHOD OF MANUFACTURING THE SAME Abstract A cold-rolled steel sheet for deep drawing having an improved bake hardenability is disclosed, which comprises 0.005-0.015 wt% of C, not more than 1.0 wt% of Si, not more than 1.0 wt% of Mn, not more than 0.15 wt% of P, 0.005-0.10 wt% of AQ, not more than 0.003 wt% of S and not more than 0.004 wt% of N provided that S+N is not more than 0.005 wt%, and Ti satisfying 1?Ti*/C?20, in which Ti*(%)=Ti(%)- Image N(%)- Image S(%). Such a cold-rolled steel sheet is obtained by continuously annealing the steel sheet after the cold rolling, provided that a residence time over a temperature region above recrystallization temperature is within 300 seconds.

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