| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous annealing furnace start-up method in which the time required for stabilizing the furnace atmosphere from the start of start-up after the opening of the inside of the furnace to an intended low dew point can be shortened.SOLUTION: When starting up a continuous annealing furnace for continuously annealing the steel plates sequentially conveyed into the in-the-furnace space adjusted to a mixed atmosphere of hydrogen and nitrogen, the inside of the continuous annealing furnace after the opening of the inside of the furnace is purged with nitrogen gas, and further the inside of the continuous annealing furnace after said purging with nitrogen gas is purged with a mixed gas of hydrogen and nitrogen having a hydrogen concentration of equal to or higher than the hydrogen concentration aimed at the time of operation. The mixed gas of hydrogen and nitrogen is continuously supplied into the inside of the continuous annealing furnace after said purging, and thereby the in-the-furnace atmosphere of the continuous annealing furnace is adjusted as well as the dew point of the mixed atmosphere is adjusted to an intended value or less. |
