C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/145, 148/34.4
C21D 8/04 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01)
Patent
CA 1332520
A method for producing cold-rolled steel sheets which comprises the steps of: producing slabs containing 0.001 - 0.003 wt.% C, 0.004 wt.% or less N and 0.03 - 0.20 wt.% P, providing that P(wt.%) x N(wt.%)? 3 x 10-4 wt.% is satisfied; hot-rolling the slabs into hot-rolled steel strips; cold-rolling the hot-rolled steel strips at 60 - 95% reduction ratio into cold-rolled steel strips; and annealing continuously the cold-rolled strips at temperature of recrystallization temperature to Ac3 transformation point temperature. The slabs further include 0.0005 - 0.0030 wt.% B. The hot-rolling is performed at finishing temperature ranging Ar3 transfromation point to Ar3 transformation + 100°C, at coling temperature of 750°C and less.
547908
Kinoshita Masayuki
Nishimoto Akihiko
Sakamoto Akira
Urabe Toshiaki
Jfe Steel Corporation
Ridout & Maybee Llp
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