C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 7/00 (2006.01) C21D 8/04 (2006.01)
Patent
CA 2081496
A method of manufacturing a cold rolled steel sheet includes the steps of preparing, as a material, a steel whose composition consists of C : 0.004 wt% or less, Si : 0.10 wt% or less, Mn : 0.50 wt% or less, Ti : between 0.01 wt% and 0.10 wt%, Nb : between 0.003 wt% and 0.03 wt%, B : between 0.001 wt% and 0.004 wt%, Al : between 0.03 wt% and 0.10 wt%, P : 0.025 wt% or less, S :0.01 wt% or less, N : 0.006 wt% or less; performing a hot rolling on the material steel under the conditions of a finishing temperature between 800°C and 900°C; coiling the material at a temperature lower than 650°C; performing a cold rolling; performing a continuous annealing at a temperature between 830°C and Ac3 transformation point; and performing a skin pass rolling.
Kato Toshiyuki
Sakata Kei
Satoh Susumu
Yasuhara Eiko
Kawasaki Steel Corporation
Smart & Biggar
LandOfFree
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