C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
117/118, 148/47
C21D 1/48 (2006.01) C21D 9/52 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01) C23C 2/40 (2006.01)
Patent
CA 1319086
Abstract of the disclosure The invention relates to a method for producing a non-aging hot-dip galvanized steel strip in a hot-dip galvanizing line with a continuous over-aging furnace at the end thereof. The steel strip is rapidly cooled from a temperature of 600 to 700°C to a temperature of about 460°C by quenching the steel strip in a zinc bath. There- after a steel strip is further cooled to a temperature preferably below 300°C and the steel strip is then brought into the continuous over-aging furnace. The temperature of said furnace is about 350°C and the over-aging treat- ment takes preferably from 2 to 3 minutes. A furnace has guide rolls arranged outside the furnace walls and the steel strip is momentarily cooled before making contact with a guide roll. After leaving the over-aging furnace, the steel strip is subjected to conventional air and water cooling as well as temper-rolling. (Figure 2)
555221
Gowling Lafleur Henderson Llp
Rasmet Ky
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