At what temperature can the atmosphere tube furnace be cooled and the furnace door opened？

The atmosphere tube furnace can only be safely opened after cooling to a certain temperature to avoid damage to the furnace and heating elements. Generally speaking, it is recommended to cool the tube furnace to at least 600 degrees before carefully opening the furnace door. This temperature point is determined based on the heat resistance of furnace materials and heating elements, as well as the impact of thermal shock on equipment.
Directly opening the furnace door at high temperatures can cause a sharp change in temperature difference between the inside and outside of the furnace, which can lead to cracking of the furnace and affect its sealing and service life. Meanwhile, if the heating element is suddenly exposed to cold air at high temperatures, it may be damaged due to excessive thermal stress. Therefore, waiting for the furnace to cool down to a lower temperature before opening the furnace door is an important measure to protect the equipment.
In addition, in order to ensure the normal operation and prolong the service life of the atmosphere tube furnace, the following points need to be noted:
During use, avoid exposing the furnace body to external impacts and vibrations to prevent the heating element from breaking at high temperatures.
The relative humidity of the equipment operating environment should not exceed 85%, and there should be no conductive dust, explosive gases, or corrosive gases in the environment to avoid damage to the equipment.
The furnace should be regularly cleaned to maintain cleanliness, improve work efficiency, and extend equipment service life.
In summary, the atmosphere tube furnace can safely open the furnace door when cooled to around 600 degrees, and other protective measures need to be taken during use.