We converted the resistance furnace CHO, into a furnace in a nitrogen-fed environment using a simple and cost-effective method. The results achieved when the furnace was supplemented with nitrogen gas at a temperature of 8500C ÷ 9000C to heat 40X alloy steel showed increased efficiency when heating the workpiece in an environment continuously supplied with nitrogen gas at a pressure of 0.3at. During the heating and heating process, nitrogen gas is continuously fed into the furnace. The embryo is put into the furnace when the temperature reaches 4000C. To facilitate the permeation process at 5000C ÷ 5500C, the workpiece is kept heated for 1 hour with the above temperature and air pressure (for workpieces heated in an environment continuously supplied with nitrogen gas). A series of samples were tested at the same temperature and heat treatment environment, only the firing environment was different, for comparison. Using a hardness tester and an electron microscope to check the test samples, we found that the results changed. The heating environment in the furnace was provided with additional nitrogen gas, and the quality of the product after heat treatment increased significantly.