C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.4
C21D 8/04 (2006.01)
Patent
CA 2006710
A method of manufacturing a steel sheet having excellent deep-drawability. A steel blank is rolled into a steel sheet having a predetermined thickness. The steel contains C: not more than 0.008 wt %, Si: not more than 0.5 wt %, Mn: not more than 1.0 wt %, P: not more than 0.15 wt %, S: not more than 0.02 wt %, Al: 0.010 to 0.10 wt %, N: not more than 0.008 wt %, and at least one element selected from the group consisting of Ti and Nb which is contained in an amount satisfying the relationship of 1.2 (C/12 + N/14) (Ti/48 + Nb/93). In at least one pass, rolling is conducted within a temperature range lower than the Ar3 transformation point but not lower than 500 °C, in such a manner that the roll radius R (mm) and the blank thickness t (mm) before rolling by rolls satisfy the relationships of R 200 and R2 x t 100000, and the total rolling reduction at temperatures lower than the Ar3 transformation point is not lower than 60 %. The hot-rolled steel sheet possesses a high level of Lankford value, and is free from cold-working embrittlement. The method may include the step of obtaining, after the rolling, pickling, annealing and hot dip galvanizing under certain conditions, a surface-treated steel sheet having excellent deep- drawability.
Abe Hideo
Katoh Toshiyuki
Matsuoka Saiji
Satoh Susumu
Yarita Ikuo
Kawasaki Steel Corporation
Smart & Biggar
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