This equipment is a vacuum nitriding furnace. Fully vacuum the furnace cavity to avoid the possibility of oxidation of the workpiece. Suitable for chemical heat treatment of high-precision workpieces such as crankshafts, cylinders, piston rings, gears, screw rods, molds, etc. that require increased wear resistance. The parts that have undergone nitriding treatment have greatly improved their fatigue resistance, corrosion resistance, and other aspects; After nitriding treatment, high-speed steel cutting tools can increase their service life by 20-200%; After nitriding treatment, the service life of the extrusion mold can be increased by 3-5 times. The nitrided surface is hard but not brittle, and has a certain toughness, making it less prone to peeling. The vacuum gas nitriding furnace is made of steel plates and has a cylindrical shell. Inside, there is a heating chamber made of shaped standard refractory bricks, and insulation material is filled between the heating chamber and the shell. There is a stainless steel welded sealed furnace tank in the heating chamber. The upper part of the tank is equipped with a vacuum rubber sealing ring, and the lower part is a water-cooled sleeve. The top of the furnace cover is equipped with a uniform heating fan to ensure the uniformity of the atmosphere inside the furnace.