| 摘要 |
PURPOSE:To enable alloying and unalloying by changing over the amount of cooling water fed to touch rolls placed above wiping nozzles from a high flow rate to a low flow rate. CONSTITUTION:A metallic strip 4 pulled up from a hot dipping bath 2 is sent to cooled touch rolls 10 placed above a pair of wiping nozzles 6 at <=5m interval after the extent of sticking is regulated to a prescribed value with the wiping nozzles 6. Cooling water is fed to each of the touch rolls 10 in two systems and the amount of cooling water fed can be changed over from a high flow rate to a low flow rate through solenoid valves 18. When an alloyed steel sheet is manufacture, cooling water is fed at a low flow rate and alloying is carried out in an alloying furnace 14. When an unalloyed steel sheet is manufactured, cooling water is fed at a high flow rate.
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