C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.4
C21D 7/02 (2006.01) C21D 1/26 (2006.01) C21D 8/04 (2006.01) C21D 9/46 (2006.01) C21D 1/18 (2006.01) C21D 9/52 (2006.01)
Patent
CA 1142068
ABSTRACT A high strength cold rolled steel sheet having improved paintability, weldability and workability is produced by hot rolling a steel containing 0.05 to 0.12% C, no more than 1.2% Si, 0.7 to 1.5% Mn, 0.04 to 0.15% P, 0.01% to 0.10% soluble Al, with the balance being Fe and unavoidable impu- rities, 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 850°C for a period ranging from 20 seconds to 2 minutes and rapidly cooling the sheet at a cooling rate ranging from 30 to 300°C/second. The steel sheet obtained in accordance with the invention is particularly useful for auto- mobile car bodies.
365649
Akisue Osamu
Yamada Teruaki
Nippon Steel Corporation
Swabey Ogilvy Renault
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