| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cooling a skid pipe in a heating furnace, which prevents Langelier index from being poorly adjusted because of cooling water having a high temperature in the heating furnace, and can surely prevent the skid pipe from being plugged, and to provide a method for manufacturing a metal plate using the same. SOLUTION: This cooling method comprises the steps of: embedding a thermocouple 105 in skid pipes of a fixed skid 103 and a moving skid 104 in the heating furnace 10, and measuring the temperature of the cooling water in the skid pipe (203); calculating correction values of M-alkalinity and pH due to the movement of the equilibrium of a bicarbonate ion from a difference between the measured temperature of the cooling water and the temperature of the cooling water in a water supply position 222 (204); calculating the Langelier index of the cooling water in the skid pipe from thus determined temperature and correction values of M-alkalinity and pH (201); calculating an amount of an alkali agent to be charged (219); and charging the alkali agent from a charging device 214 on the basis of the result. COPYRIGHT: (C)2009,JPO&INPIT
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