C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/146, 148/31
C21D 9/48 (2006.01) C21D 8/04 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01)
Patent
CA 2024945
ABSTRACT OF THE DISCLOSURE A cold-rolled steel sheet suitable for deep drawing has a composition containing up to about 0.005 wt% of C, up to about 0.1 wt% of Si, up to about 1.0 wt% of Mn, up to about 0.1 wt% of P, up to about 0.05 wt% of S, about 0.01 to 0.10 wt% of A?, up to about 0.005 wt% of N, one, two or more elements selected from the group consisting of about 0.01 to 0.15 wt% of Ti, about 0.001 to 0.05 wt% of Nb and about 0.0001 to 0.0020 wt% of 8, and the balance substantially Fe and incidental impurities. The steel sheet exhibits a Lankford value (r-value) of about ? ? 2.8 and also exhibits the difference (rmax - rmin) between the maximum value rmax and the minimum value rmin satisfying the condition of (rmax - rmin) ? about 0.5. The steel sheet is produced by a process having the steps of: conducting hot-rolling on the steel material of the above-described composition; conducting a primary cold rolling at a rolling reduction not smaller than about 30%; conducting intermediate annealing at a temperature ranging between the recrystallization temperature and about 920°; conducting secondary cold rolling at a rolling reduction not smaller than about 30% so as to provide a total rolling reduction not smaller than about 78%; and conducting final annealing at a temperature which is between the recrystallization temperature and about 920°C.
Abe Hideo
Matsuoka Saiji
Satoh Susumu
Uesugi Nobuhiko
Kawasaki Steel Corporation
Smart & Biggar
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