C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.4
C21D 9/46 (2006.01) C21D 8/04 (2006.01) C21D 1/18 (2006.01) C21D 1/60 (2006.01)
Patent
CA 1142069
ABSTRACT A two-phase high tension cold rolled steel sheet having improved workability is produced by hot rolling a steel containing 0.01 to 0.12% C, not more than 0.1% Si, 1.0 to 1.8% Mn, 0.01 to 0.10% soluble Al, with the balance being Fe and unavoidable impurities, cold rolling the hot rolled steel sheet and subjecting the cold rolled steel sheet to a continuous annealing. The continuous annealing is performed by soaking at a temperature ranging from 730 to 800°C for a period rang- ing from 20 seconds to 2 minutes and cooling the sheet to 250°C or below at a cooling rate ranging from 30 to 300°C/sec. The steel sheet obtained in accordance with the invention is parti- cularly useful for automobile car bodies.
365677
Akisue Osamu
Yamada Teruaki
Nippon Steel Corporation
Swabey Ogilvy Renault
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