The tube furnace air firing method means that before the material is baked in the tube furnace, an empty firing operation is required to remove the moisture and other impurities in the tube. The specific steps of empty burning operation are as follows:Analysis of vacuum heat treatment process for wind power products Open the intake and exhaust valves of the tube furnace to allow the air in the furnace to circulate. Turn on the power and adjust the temperature in the furnace to the set temperature. After the temperature in the furnace reaches the requirement, clean up the materials in the furnace.https://www.vacfurnace.com/technology-frontiers/pay-attention-to-vacuum-tempering-to-improve-the-quality-of-quenched-parts/  Close the intake valve and let the gas in the furnace circulate so that the oxygen and other impurities in the air in the tube can be fully burned. Maintain the temperature and time in the tube until the combustion in the tube is completely over.Close the exhaust valve and lower the temperature in the furnace to room temperature. Check whether there are residual ash and other sundries in the tube furnace, and clean them up in time.Vacuum Heat Treatment Applications for Metal Machine Tools and Gear Parts The above are the specific steps of the tube furnace empty firing method. During air firing, the temperature and time must be strictly controlled to ensure the quality of the material in the tube and the safety of the equipment in the furnace.Vacuum hardened spring steel wire