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During the nitriding heat treatment process in a gas nitriding furnace, nitrogen is required to expel the gases from the workpiece, ensuring that the atmosphere concentration within the gas nitriding furnace meets the required standards. Failure to remove nitrogen from the gas nitriding furnace can lead to a series of adverse effects.

1. Non-regenerative nitrogen will lead to an excessively thick oxide layer on the surface of the workpiece, which will affect the formation of the internal nitriding layer, resulting in insufficient hardness of the nitrided workpiece and failing to meet the required performance standards.

2. During the nitriding heating process, the trapped nitrogen gas will expand as the temperature rises, exerting a certain pressure on the workpiece, which may lead to deformation and seriously affect product quality. Furthermore, not removing nitrogen will result in nitrogen waste, increase the energy consumption of the nitriding furnace, and cause economic waste and environmental pollution.

To avoid the aforementioned issues, a denitrification operation should be performed after the nitriding process in the gas nitriding furnace. This operation can be achieved through various methods, such as opening the gas outlet valve of the nitriding furnace to allow nitrogen to escape naturally, or using a vacuum pump to exhaust the gas inside the nitriding furnace. The interval between denitrification operations should be determined and planned based on actual usage needs, and relevant tests and calibrations should be conducted after the denitrification operation to ensure the equipment's operational efficiency and treatment effectiveness.