1, according to the production task list from the warehouse to collect materials; 2. Install the furnace reasonably according to the diameter of the material ring, install the furnace cover for sealing, screw on the furnace cover reinforcement screws to strengthen the sealing, connect the water pipe, vacuum to -5KG, record the value of the pressure gauge, and set the spheroidizing process; 3. After 30 minutes, check the pressure gauge value (check the tightness of the spheroidizing furnace), and fill with nitrogen when the pressure gauge has no change.