In vacuum heat treatment, when steel parts are heated in a vacuum furnace, if the vacuum level is too high,
the alloy elements in the workpiece material are prone to volatilization.
At this point, liquid nitrogen can be gradually vaporized into nitrogen gas through a liquid nitrogen tank,
and an appropriate amount of nitrogen can be refilled into the furnace to increase the pressure of trace gases inside the furnace
and avoid the volatilization of alloy elements.



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