Metallurgical apparatus – With control means responsive to sensed condition – With means supplying a treating agent
Patent
1998-01-16
2000-04-25
Kastler, Scott
Metallurgical apparatus
With control means responsive to sensed condition
With means supplying a treating agent
266 46, 266113, 266114, C21D 9573
Patent
active
060540958
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cooling system for cooling a strip uniformly in the width direction of the strip in a continuous strip heat-treating process.
BACKGROUND ART
Concerning a heat-treating apparatus in which a strip is continuously heat-treated, various types of heat-treating apparatus are conventionally proposed. FIG. 1 is an arrangement view showing an example of the continuous strip heat-treating line. As shown in the view, a strip 11 is rewound by a payoff reel 1 and passes through a cleaning unit 2. Then the strip 11 passes through a heating zone 3, soaking zone 4, first quenching zone 5, heat-recuperating zone 6, over-aging treating zone 7, and second cooling zone 8. After that, the strip 11 is sent to a rolling mill 9 and then coiled by a tension reel 10.
In order to cool the strip in the first quenching zone 5 and the second cooling zone 8 in the above continuous strip heat-treating line, various cooling methods are conventionally proposed. When a general classification is made of these conventional cooling methods, the following three cooling methods are provided: a method of cooling a strip when a cooled roller comes into contact with the strip (Japanese Unexamined Patent Publication No. 59-143028); a method of cooling a strip when a cooling medium is directly blown against the strip (Japanese Unexamined Patent Publication No. 57-67134); and a method of cooling a strip when the strip is dipped in a cooling medium (Japanese Unexamined Patent Publication No. 54-162614).
In general, when the cooling zone is devised, these cooling methods are used singly or, alternatively, these cooling methods are used in combination with each other.
Next, referring to an example, the cooling method of cooling a strip by directly blowing a cooling medium against the strip will be explained as follows.
FIG. 2 is a cross-sectional view of the second cooling zone 8 taken on line X--X in FIG. 1. In this view, there is shown a means for cooling a strip by directly blowing a cooling medium against the strip. In the conventional cooling zone, the strip 11 is cooled as follows. The strip 11 is regarded as a flat shape, and cooling headers 12 are arranged in parallel with this flat strip 11. On the cooling headers 12, which are arranged in parallel with the strip, there are provided a plurality of cooling nozzles 13 which protrude perpendicularly to the cooling headers 12, and a cooling medium 14 is directly blown from the plurality of cooling nozzles 13 against the strip 11 so as cool the strip.
In the above construction, a plurality of cooling headers 12 are arranged in the direction of a vertical path in which the strip 11 is conveyed.
Water can be used as the cooling medium 14. In this case, water includes pure water, softened water, hard water, filtered water, clean water, fresh water, raw water and water into which an antioxidant is added. Also, gas can be used as the cooling medium 14. In this case, the gas includes atmospheric gas used in a furnace, inert gas such as argon, nonoxidizing atmospheric gas such as nitrogen, atmosphere or a mixed gas into which the above gases are mixed. The above are singly used, or alternatively the above are used in combination with each other.
As a special example of the cooling medium of liquid, there is proposed a method in which an organic solvent, the boiling point of which is high, or salt is used instead of water. In this connection, the methods of spray cooling and mist cooling are respectively defined as follows in this specification. When a strip is cooled by directly blowing a cooling medium against the strip, liquid such as water is singly used as the cooling medium. This cooling method is defined as spray cooling. When a strip is cooled by directly blowing a cooling medium against the strip, a mixture in which liquid such as water and gas are mixed with each other is used. This cooling method is defined as mist cooling.
When a strip passes in a vertical passage, it is warped in the longitudinal and the width direction because various stres
REFERENCES:
patent: 4318534 (1982-03-01), Thome et al.
Hamamoto Yasuo
Hosojima Takuro
Ishibashi Hiroo
Minato Ken
Tomino Shinichiro
Kastler Scott
Nippon Steel Corporation
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