C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/54, 38/8
C21D 9/573 (2006.01) C21D 1/667 (2006.01)
Patent
CA 1256355
ABSTRACT OF THE DISCLOSURE In a cooling zone of a continuous annealing line engineered to continuously process lognitudinally travelling steel strip, the strip is first slowly cooled to a desired temperature at a rate of not higher than 20°C/sec by means of a jet stream of cooling gas ejected against the surface of the strip and subsequently quenched to a desired temperature at a rate of not lower than 70°C/sec. Thinner strip is quenched by high-speed gas-jet cooling that is effected by ejecting a jet stream of cooling gas against its surface, while heavier strip is quenched by bringing it into contact with the perimeter of cooling rolls cooled by a coolant. Namely, quenching is achieved either by high-speed gas- jet cooling or roll cooling depending on the thickness of the strip being processed. A cooling apparatus for implementing the cooling method described above comprises a high-speed gas-jet cooling zone where the strip is cooled by means of a jet stream of cooling gas ejected against its surface and a roll cooling zone following the high-speed gas-jet cooling zone where the strip is brought into direct contact with a plurality of cooling rolls. Means to exert longitudinal tension on the strip travelling through the roll cooling zone are provided at the entry and exit ends thereof.
502309
Ichida Kozaburo
Murata Mineo
Nagira Norichika
Namba Tadashige
Fetherstonhaugh & Co.
Nippon Steel Corporation
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