SEASONING METHOD FOR ATMOSPHERIC FURNACE AND ATMOSPHERIC FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a seasoning method for an atmospheric furnace and the atmospheric furnace, in which seasoning can be carried out hardly causing oxidative consumption to an easily oxidizable member.;SOLUTION: The atmospheric furnace is provided with an easily oxidizable member such as carbon in the inside, and a heat treatment of the to-be-treated object is conducted in nonoxidative atmosphere. Temperature in the furnace is raised by a heater, while a seasoning gas is being supplied in the furnace. The furnace temperature is maintained at a predetermined temperature T₀, at which the oxidative consumption of the easily oxidizable member is suppressed to a small amount. When the dew-point in the furnace is dropped during the maintenance of the furnace-temperature to a predetermined dew-point value D₀, at which the oxidative consumption of the easily oxidizable member at a high temperature is suppressed in a small amount, the furnace temperature is raised at least to the predetermined temperature T₀, while the in-furnace dew-point is maintained at the predetermined dew point value D₀, or lower. The furnace temperature is raised up to furnace-use temperature TB at the operation-start time, and at the same time the in-furnace dew-point is dropped to a use dew-point at the operation-start time.;COPYRIGHT: (C)2003,JPO