Importance

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Abstract

A heat treatment furnace (10) used to perform heat treatment on a treatment target (1) includes a hollow heating chamber (20) in which the treatment target is housed and which is formed of a heat insulating member, a resistance heater (22) that is mounted in the heat insulating member, a hollow furnace body (12) that is spaced apart from the heating chamber by a gap and surrounds the heating chamber, a nozzle (16) that is provided to the furnace body so as to communicate with an interior of the furnace body, an electrode bar (30) that is removably mounted on an outer end of the nozzle and is electrically insulated from the nozzle, and a flexible conducting wire (32) that electrically connects a lead wire (23) of the heater and the electrode bar. The conducting wire (32) can be attached to and detached from the electrode bar (30) outside the nozzle (16) while the electrode bar (30) is separated from the nozzle (16), and has such a length that it does not come into contact with the inner surface of the nozzle while the electrode bar is mounted thereon.

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First Claim