| 摘要 |
PURPOSE:To cool or cool quickly and easily a strip down to a prescribed temp. by injecting hot water from injection nozzles onto the strip moving continuously in a cooling vessel or injecting cooling water thereto after the cooling water into the cooling vessel. CONSTITUTION:The strip 2 heated to the prescribed temp. in a heating and holding furnace of a continuous heat treatment furnace is conducted to the cooling vessel 1 installed in succession thereto. The strip is cooled while the strip moves continuously vertically from an inlet 3 toward an outlet 4. The hot water maintained at and under a high temp. and high pressure is injected from plural pieces of the injection nozzles 11 disposed to face both sides of the strip 2 onto the surface of the strip 2 to cool the strip down to about 400 deg.C at a cooling rate of about 100-250 deg.C/sec in the case of the steel strip for deep drawing. The cooling water is poured into the vessel 1 and at the same time the cooling water is injected from the nozzle 11 to cool quickly the strip 2 down to the water temp. at a cooling rate of about 1,000-1,500 deg.C/sec if the high tensile steel strip is intended.
|
