C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/33, 80/51
C21D 8/02 (2006.01) C21D 9/52 (2006.01) C22C 38/00 (2006.01) C21D 1/19 (2006.01)
Patent
CA 1321125
Abstract of the Disclosure A cold rolled steel sheet having a good ageing resistance is produced by subjecting a cold rolled steel sheet to continuous annealing including recrystal- lization, grain growth, quenching, supercooling, reheat- ing and overageing according to inclinatory cooling, where after the recrystallization and the grain growth, the steel sheet is quenched at a cooling rate of 50 to 250°C/sec from 720 - 600°C to 200 - 310°C; after retain- ing the steel sheet at the same temperature for 0 to 15 seconds, the steel sheet is reheated by at least 40°C up to 320 - 400°C; then the steel sheet is cooled from or retained at the same temperature at a rate of not more than 0.7°C/sec including the time for retaining the steel sheet at the same temperature; and then the steel sheet is cooled at an average cooling rate of not more than 10°C/sec in a temperature zone of higher than 350°C, at a specific average cooling rate in a temperature zone of 350°C to 300°C and at a specific average cooling rate down to 285 - 220°C in a temperature zone of lower than 300°C.
591653
Akisue Osamu
Hayashida Teruki
Kawai Kenji
Sano Yuuji
Ukena Toshiyasu
Nippon Steel Corporation
Swabey Ogilvy Renault
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