C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.4
C21D 8/02 (2006.01) C21D 8/04 (2006.01) C21D 9/46 (2006.01)
Patent
CA 1271692
60-116,661 Abstract of the Disclosure A method of manufacturing a cold-rolled steel sheet having a good deep drawability is disclosed, wherein a hot rolled steel sheet having a composition of C<0.0035%, Si<1.0%, Mn<1.0%, A?:0.005-0.10%, P<0.15%, N<0.0035%, S<0.015%, Ti:(?N(%)+?S(%)) or {4x(C(%)+N(%))}~(3??C(%)+?N(%)+?S(%)) and Nb: (0.2??C(%))~(?C(%))% is cooled within 2 seconds after the completion of finisher rolling and then at an average cooling rate of not less than 10°C/sec until it arrives at a coiling step, and then the cooled steel sheet is coiled at a temperature of not more than 710°C, subjected to a cold rolling at a reduction of not less than 50%, which was subjected to a continuous annealing in a heatcycle inclusive of heating from 400°C to 600°C at a heating rate of not less than 5°C/sec and soaking at a temperature range of 700°C-Acs point for 1 second or more.
510435
Hashiguchi Koichi
Okano Shinobu
Sakata Kei
Kawasaki Steel Corporation
Smart & Biggar
LandOfFree
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