C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/94, 117/114.
C23C 2/06 (2006.01) C23C 2/02 (2006.01) C23C 2/28 (2006.01) C23C 2/40 (2006.01)
Patent
CA 1321127
Abstract of the Disclosure A zinc-plated steel sheet with an ageing resistance is produced from an Al-killed steel by hot dip type, con- tinuous zinc plating including recrystallization and annealing, where after recrystallization and grain growth, the steel sheet is quenched at a cooling rate of 30 ~ 250° C/sec from 720 ~ 600°C to 310 ~ 200°C; after keeping the steel sheet at the same temperature for 0 to 15 seconds, the steel sheet is reheated to a molten zinc bath tem- perature; then the steel sheet is dipped into the molten zinc bath for zinc-plating; and then the steel sheet is cooled at a cooling rate of 250 to 5°C/sec from that temperature to 350°C; and then the steel sheet is cooled at a specific average cooling rate in a temperature region of 350°C to 300°C and at a specific average cooling rate in a temperature region of from 300°C to 285 ~ 220°C.
593075
Akisue Osamu
Hayashida Teruki
Oda Masahiko
Ukena Toshiyasu
Yamada Teruaki
Nippon Steel Corporation
Swabey Ogilvy Renault
LandOfFree
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